4 x 386 Floating Point Units / Math Co-Processors overclocked and benchmarked! @atheatos

Atheatos This video is all about 386 FPUs / Math Co-Processors.
I used again my M326 v5.2 M/B that intergrates an AM386DX CPU.
Fully optimized and tuned with 0WS memory up to 50MHz+.

In the Video:
1) I compare 4 different models. The latest ones from the major players: Intel (A80387DX-33), IIT (4C87DLC-40), ULSI (US83C87-C), and Cyrix (CX-83D87-40-GP).
2) Overclocking and Benchmarking with a very competitive Quake run result.

Benchmark results:
drive.google.com/file/d/129HB4GGYU07h7WOWuDHJr_p0qeyD4e3o/view

FPU Benchmarks:
In the end... I messed up the Quake measurements (only 0.1 FPS accuracy).
It is possible to divide the Frames by the Seconds and get an accurate FPS score.
drive.google.com/file/d/1usS-DzJJqMTP1oMKkA4ySYYrG73vq33n/view

Site with detailed information on FPUs:
dougx.net/gaming/coproc.html

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updated 5 years ago

4 x 386 Floating Point Units / Math Co-Processors overclocked and benchmarked!

Atheatos 2021-04-21 | This video is all about 386 FPUs / Math Co-Processors.
I used again my M326 v5.2 M/B that intergrates an AM386DX CPU.
Fully optimized and tuned with 0WS memory up to 50MHz+.

In the Video:
1) I compare 4 different models. The latest ones from the major players: Intel (A80387DX-33), IIT (4C87DLC-40), ULSI (US83C87-C), and Cyrix (CX-83D87-40-GP).
2) Overclocking and Benchmarking with a very competitive Quake run result.

Benchmark results:
drive.google.com/file/d/129HB4GGYU07h7WOWuDHJr_p0qeyD4e3o/view

FPU Benchmarks:
In the end... I messed up the Quake measurements (only 0.1 FPS accuracy).
It is possible to divide the Frames by the Seconds and get an accurate FPS score.
drive.google.com/file/d/1usS-DzJJqMTP1oMKkA4ySYYrG73vq33n/view

Site with detailed information on FPUs:
dougx.net/gaming/coproc.html

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MB457 (UM8498F) Review. Challenging repair! UMC U5SX vs Intel 486SX.

Atheatos 2025-07-05 | Today's Lab-Rat is my PowerTech MB457, ISA 486 Motherboard.
It came to me very sick, practically dead T-T.

I traced the problem to his heart (the UM8498F Chipset).
I performed a heart transplant, and some other procedures.
It lived again! The brain, UMC U5SX (Green CPU), was fine.
The UMC U5SX is a 486SX clone brain, with superior performance.

In this video:
1) Figuring out a burned chipset.
2) Swapping the chipset, fixing all problems.
3) Full MB457 M/B Review, Modding, Optimization.
4) Benchmarking of the UMC U5SX CPU.
5) Comparisons with 486SX and 486SX2.

Benchmark results:
docs.google.com/spreadsheets/d/1Dc8Ki33iS0tqFS2PxDO-v3w6ZpAYDu52/view

Cirrus Logic Mem Speed tool (clmclk):
github.com/karcherm/clmclk/tree/main

-- TIMESTAMPS --
00:00 - Intro
02:57 - Brocken? Figuring the problem.
08:09 - Replacing the Chipset.
12:08 - More repairs and Mods.
14:46 - Hardware Setup.
17:09 - Bios and other Optimizations.
20:47 - Benchmarking the UMC U5SX.
23:31 - Benchmark Comparisons.
27:04 - Outro

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486SXLC Overclocked to the MAX! New records set! Simple Clock Mod for RC2016.

Atheatos 2025-06-28 | So this is probably the final video with a 386SX M/B based on the SARC RC2016 chipset.

This time:
1) I stabilized my M396F motherboard under all conditions.
2) I present a simple and inexpensive way to clock mod a RC2016 M/Bs.
3) I overclock the 486SXLC to the max. I set new records!
4) I do a bit of 387SX FPU testing too.

DO NOT MISS THIS!

Benchmark results:
docs.google.com/spreadsheets/d/1BgKYBFAIsO90jvC3bIrq2euzxMZriCNi/view

K2s Retro Workshop - Cx486SLC 50Mhz Video:
youtube.com/watch?v=ldYQQPYlRAU

-- TIMESTAMPS --
00:00 - Intro
01:45 - 387SX FPU Talk.
03:29 - Clock MOD.
08:06 - Hardware Config, Crosstalk.
09:04 - Results Config 1: Max Clock x1 Mul with FPU.
11:29 - Results Config 2: Max Clock x2 Mul with FPU.
14:49 - Results Config 3: Max Clock x1 Mul no FPU.
20:15 - Outro / Upcomming.

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386SX Motherboard Review M396F (RC2016A5). Hacking in a 486SXLC. Will the doubler work?

Atheatos 2025-06-21 | And here we are again with more tests with the SARC RC2016 chipset.
This time we have a motherboard with different layout, the PCChips M396F v3.0.
And for sure I am giving it a 486SXLC treatment.
I also include a mini soldering tutorial this time.

The clock doubler finally worked! Even thought this is not a 486SXLC2 chip.
Many unexpected things happened against common sense.
Unstable in the beginning, but in the end it worked 100%!

So this time I explore the clock double effect by comparing:
1) 486SXLC, 1 x 25MHz
2) 486SXLC, 2 x 25MHz
3) 486SXLC, 1 x 40MHz

So finally a proper 486sxlc2 review. Enjoy!

Modded BIOS file for RC2016 Motherboards.
drive.google.com/file/d/1DNq2IDfkiZTdpMsm5D-ljUpbMxSzWHtk/view

Benchmark results:
docs.google.com/spreadsheets/d/1X-5AHnvocH2Bk1E4PI7Da_2p6mqPxUlm/view

K2s Retro Workshop - RC2016 with working Clock Double:
youtube.com/watch?v=t415uFWPkmY

Marco-Both / M396F-Replika Github:
github.com/Marco-Both/M396F-Replika

skiselev / mb386sx-rc2016 Github:
github.com/skiselev/mb386sx-rc2016

-- TIMESTAMPS --
00:00 - Intro
00:43 - The M396F Replica.
02:53 - Closer look and mods.
04:19 - Plans for today - the CPU.
05:44 - Replacing the CPU (tutorial).
13:18 - CPU Swap outcome.
18:07 - Results at 2 x 25MHz.
21:08 - Results Comparisons.
24:39 - Outro / Conclusions.

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A rare 386SX clone! VM Technology VM386SX+. Fully tested and compared.

Atheatos 2025-06-14 | Time to check this quite obscure and rare 386SX clone CPU.
It is the VM Technology VM386SX+.
VMT was a Japanese company.
This CPU was only sold in East Asia.

Here I compare it to the standard Intel 386SX.
And then for sure I push it to the limits.

CPU release article:
https://websrv.cecs.uci.edu/~papers/mpr/MPR/ARTICLES/071504.pdf

Modded BIOS file for RC2016 Motherboards.
drive.google.com/file/d/1DNq2IDfkiZTdpMsm5D-ljUpbMxSzWHtk/view

Comparison results:
docs.google.com/spreadsheets/d/19ivA5OGyynJI8U_PhpvVicKsnm24FqT0/view

-- TIMESTAMPS --
00:00 - Intro
00:55 - The VM386SX+.
04:12 - Motherboard updates.
07:54 - 386SX vs VM386SX+.
11:25 - VM386SX+ Max Clock.
14:21 - Conclusions / Outro

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386SX vs 486SLC vs 486SXLC2... New Overclocking records! Doom Playable?

Atheatos 2025-06-08 | And here we are again with more tests on my SER-386-SS (RC2016) 386SX Motherboard!

This time I test way more CPUs and I push them to the limit:
1) New Am386SX Chip
2) An Intel 80386SX-40
3) A TX486SLC-33
4) A 486SXLC2-G50-WN

So... I compare 386SX vs 486SLC vs 486SXLC2.
New Overclocking records were reached!
A new, custom / modified ALI Bios is used!

Also for the first time I include FastDoom runs!
Yeah, Doom is actually playable on 386SX!

Modded BIOS file for RC2016 Motherboards.
drive.google.com/file/d/1DNq2IDfkiZTdpMsm5D-ljUpbMxSzWHtk/view

Benchmark results:
docs.google.com/spreadsheets/d/1boEcq73_EUCSniDHcbWif57oydCL9Te4/view

K2s Retro Workshop - RC2016 with working Clock Double:
youtube.com/watch?v=t415uFWPkmY

K2s Retro Workshop - Cx486SLC 50Mhz Video:
youtube.com/watch?v=ldYQQPYlRAU

-- TIMESTAMPS --
00:00 - Intro
01:23 - Used Hardware.
03:04 - Modded Bios and Settings.
04:54 - The 386SX CPUs.
06:47 - 386SX OC Results.
10:59 - The 486SLC CPU.
12:10 - 486SLC OC Results.
14:49 - The 486SXLC2 CPU.
18:00 - 486SXLC2 OC Results.
21:22 - All Benchmark Results.
23:47 - Outro

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The time when ATI was Clock Locking their GPUs. Ways to Circumvent. Bios Modding Tutorial! #GPUJune2

Atheatos 2022-06-15 | It is now time for some GPU Modding / Overclocking. #GPUJune2

Back in 2003 ATI decided to Clock Lock all Low-end and Mid-range GPUs.
This includes all Radeon models from the 9000 to the 9600.
This is so SAD... It makes me cry, for real. T-T

So in this video I present all the ways to circumvent this lock. :D
This includes software Tools, Modded Drivers, and BIOS Modding.
A lot of different tools are used here: ATITool, RaBiT, FlashRom.
So this is a nice mini Tutorial on all these methods.

In theory the same tools can be used to unlock pipes on certain models.
This is not covered here, as I do not have any of these cards (9500 and 9800SE).
I might explain this in a future video.

Addition:
The RaBiT Tool can directly open the Bios running on you GPU.
With the option: Open, OnBoard EEPROM

ATI Overclocking and Bios Tools:
drive.google.com/drive/folders/1stjYtg4_w4DPrkc1EJKj14v6diy6YFrI

Link to archived modded drivers site:
web.archive.org/web/20070604050712/http://www.techpowerup.com/softmod/previous.php
Another one that might help is the Radeon Omega Driver:
guru3d.com/files-get/radeon-omega-drivers-4-8-442,4.html

-- TIMESTAMPS --
00:00 - Introduction
03:45 - Circumventing the Lock, Tools and Drivers (Windows XP).
08:43 - Circumventing the Lock, ATI GPU Bios Mod (All OS).
12:56 - Outro

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Binning / Testing 14 Am5x86 CPUs. The 190% Overclock on Am486-DX2-66 and the Unreal 70MHz 486 Bus!

Atheatos 2022-06-05 | This video has two parts:

On the fist part I am Overclocking my entire 5x86 collection on Air.
That is 14 pieces in total, 6 different markings / models.
What is the effect of the exact marking on Overclocking?

Then using one of these CPUs I am pushing my Motherboard...
in order to find the absolute maximum Bus Speed here.
Surprising world record results as always :)

Correction on the Video:
The overclock is +190% (not 290%), or 2.9x times the speed.

-- TIMESTAMPS --
00:00 - Intro
00:50 - The CPUs.
02:36 - The Test Setup.
04:31 - Binning / Testing Results.
08:46 - Max Bus Speed!
13:30 - Outro

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Pentium Overdrive (Socket 3). Modding, Over/Underclocking. New Records! IBM-XT Performance Possible?

Atheatos 2022-05-29 | The focus of this video is on the Intel Pentium Overdrive Processor...
for 486 M/Bs (Socket 2/3), models PODP5V63 and PODP5V83.
I am using again my heavily modified Soyo 4SAW2 M/B (SIS 85C496).

Some crazy amount of information in this video.
Yeah I cover Everything, absolutely Everything!
I had a-lot of fun with this one here...
Modified the cooling, the voltage regulator and more.

Extreme Overclocking / Underclocking!
What was the performance in DOS Quake?
Is IBM-XT (8088) performance possible?
The answers in the video, Enjoy! :)

Benchmark results (spoilers):
docs.google.com/spreadsheets/d/1hUfLIuptfEcIcqi5xw6Dlv7xmWyDDUFT

Speed sensitive IBM PC-XT games:
docs.google.com/spreadsheets/d/1UgMSo_23Z1qIOLrQfsOkgaMGkFjvcXbN/view

-- TIMESTAMPS --
00:00 - Intro
01:06 - About the Pentium Overdrive.
06:24 - Modding the Stock Cooler.
10:54 - Modding the Voltage Regulator.
22:55 - Modding some Config Pins.
25:12 - Overclocking Results.
34:30 - Underclocking Results.
42:16 - Outro

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Testing even more 387DX Floating Point Units. Overclocked to the MAX and Benched with a 486DLC.

Atheatos 2022-05-22 | It is time again to check some 387DX FPUs / 386 Math Co-Processors.
I am using again my M326 v5.2 M/B, this time with a 486DLC CPU.
It is a good idea to first check my original video on this topic:
youtu.be/Tv9LVhlo7EM

Since then my FPU collection has increased by a lot!
Now we have here 12 Differently looking Floating Point Units,
with 6-7 unique performing ones!
Tested all using 6 different specialized Benchmarks.
At 40Mhz and overclocked to the MAX (up to 55MHz).

The models are:
- Intel, i387DX, A80387DX-33
- IIT, 3C87-40
- IIT, 4C87DLC-40
- LC Technology, Green MATH, 4C87DX-40
- ULSI, DX/DLC, US83C87 40Mhz
- ULSI, DX/DLC, US83C87-C 40Mhz
- ULSI, Math Co DX, 9345A3D 40Mhz
- Cyrix, 487DLC, Cx487DLC-33GP
- Cyrix, FasMath, CX-83D87-40-GP
- Cyrix, FasMath, CX-83D87-33-GP-KN

Benchmark results:
docs.google.com/spreadsheets/d/1-ofcQCJH9IbY6TkvRIQnhtK55NbfKOUn/view

Site with detailed information on FPUs:
dougx.net/gaming/coproc.html

-- TIMESTAMPS --
00:00 - Intro
01:06 - The 387DX FPUs.
04:59 - New ULSI FPU, New records!
06:31 - Overclocking Results.
08:20 - Benchmark Results.
13:03 - Conclusions and Recommendations.
14:44 - Outro, Next steps.

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Over/Underclocking the Am5x86 (AMD 486). Insane results, IBM-XT(8088) to Pentium Performance Levels!

Atheatos 2022-05-17 | Yeah, it is time for some Overclocking / Underclocking fun with:
- My heavily modded Soyo 4SAW2 M/B (SIS 85C496).
- A few Am5x86 CPUs (These are the last 486 CPUs from AMD).
- Lots of PCI VGA cards.
Additionally this video is a mini review optimization guide on this M/B.

This machine now covers a crazy amount of performance span.
You can basically run everything form the very first IBM-XT (8088)...
games to early Pentium optimized 3D / Glide games. #486quakerace

Clarification:
The de-turbo function here probably does not actually halve the clock.
This is a complicated topic. The chip-set most likely idles the bus for 2/3 of the time.
In the end the result is very similar. I run lots of benches to verify.
In general the slow down was 20-50%. But most did exactly -50%.

CPU Galaxy's Am5x86 overclocking record Video:
youtube.com/watch?v=LI1_RlVLhu8

Benchmark results:
docs.google.com/spreadsheets/d/1hUfLIuptfEcIcqi5xw6Dlv7xmWyDDUFT

Speed sensitive IBM PC-XT games:
drive.google.com/file/d/14bnG_hMGu6oCgg5whxSzpuPcFRvqUIJO/view

-- TIMESTAMPS --
00:23 - Intro
04:00 - The Motherboard, Caches and RAM.
06:58 - Interesting Jumpers.
09:11 - The rest of the Hardware, VGA Cards.
13:57 - Bios Settings.
19:56 - Overclocking Results.
26:55 - All results, Comparisons.
30:12 - Underclocking Results.
39:47 - Outro

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Beating again all my 386DX and 486DLC Records! My final results on the M326 motherboard.

Atheatos 2022-05-07 | The time has come again to beat all my previous 386DX and 486DLC Records!
I am still using the same, heavily modified, PC-Chips M326 V5.2 Motherboard.

Well for sure the improvements were not that spectacular this time.
But some benchmarks were improved by even +6% (like Doom!).
All that was achieved with optimizations and mods alone.
This is again an information packed Video! Enjoy!
Two of the things I did here, you can also replicate with ease!

The improvements are:
1) IDE Device driver (+20% disk speed)
2) 0WS Ram @55MHz!
3) KEN# Pin mod for the 486DLC.

You can download the W83759AF IDE Driver here:
drive.google.com/u/0/uc?id=1pWvgSzb67addEFXEJvCcsg-jgsJZdkI5&export=download

-- TIMESTAMPS --
00:00 - Intro
01:05 - All the Hardware.
06:53 - IDE Bus Driver - Speed boost.
11:48 - 0WS Ram @55MHz.
13:27 - KEN# Input Mod.
14:56 - 386DX Benchmark Results.
17:27 - 486DLC Benchmark Results.
20:43 - All Results - Conclusions.
22:16 - Outro

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Hacking a 486SXLC2 (8KB of L1 Cache) into a lucky 386SX Motherboard. Insane performance boost!

Atheatos 2022-04-30 | OK, I promised... I am delivering!

I modded my 386SX Lab Rat with a 486SXLC2 CPU.
It is advised to first check my Video review of this M/B:
youtu.be/MiOfbpbrDW0

The 486SXLC2 is the top 16bit bus, Cyrix based, 386 replacement CPU!
It features 8KB of integrated L1 Cache and a clock doubler.

- The mod was a success! The results were mixed.
- I do not wand to spoil this too much in the description.
- Lots of tweaks, benchmarks and interesting conclusions in this Video.
- I also broke my 386SX Overclocking record (more maybe possible).

* There is something important I missed (said wrong) in this video.
* The OP1 is NOT the Flush signal, it is the A20 than connects to the keyboard controller.
* Flush is not connected on the CPU here. I mixed these two a they are next to each other.
* A20 is needed for the correct operation of the L1 cache (with the 64k boundary option enabled).
* This explains the behavior when I played with the different flags in the cyrix utility.
* I will come with an update video on this topic (along with some other stuff).

Now, I am not going to put these CPU modules into the store.
But if someone is really interested we can discus this.

Benchmark results:
docs.google.com/spreadsheets/d/1VfjFBPiFDDGtoDdEQwuFXg_M1vIID-uW/view

K2s Retro Workshop - Cx486SLC 50Mhz Video:
youtube.com/watch?v=ldYQQPYlRAU

Vogons "Register settings for various CPUs":
vogons.org/viewtopic.php?t=45756

-- TIMESTAMPS --
00:00 - Intro
02:09 - Cyrix 386 Replacement CPUs.
04:30 - About the 386SX and 486SXLC Pinouts.
07:22 - The Flush signal on the Motherboard.
08:38 - And the mods are in!
11:25 - Results with the 386SX.
13:42 - Results with the 486SXLC2.
24:39 - All Benchmark Results.
29:29 - Outro

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386SX Motherboard Review (SARC RC2016 chipset): Optimization Guide, Modding, Overclocking.

Atheatos 2022-04-23 | Introducing to you my latest 386 LabRat!
This is a 386SX and the M/B model is "SER 386-SS"
This is based on the SARC RC2016 chipset.
Many M/Bs have a similar design.

The following M/Bs have exactly the same Layout:
- BEK-tronic "BEK-3703"
- Pine Technology "PT-319A"

OK, This video basically has it all:
- Motherboard Review.
- Optimization Guide.
- A few mods here and there.
- Lots of Benchmarks.
- Overclocking!
- And a "To be Continued!" that will make you impatient.

-- TIMESTAMPS --
00:00 - Intro
02:07 - Hardware Details - Optimal Configuration.
08:07 - BIOS - Optimal Settings.
10:40 - Modding the Clock generator (w Any-Clk).
13:55 - Benchmark Results @ 40MHz.
16:47 - Overclocked Results.
19:39 - Lithium Battery Mod.
22:23 - Outro

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SIS 486 M/B SY-4SAW2. 4 + 1 MODS. Now with a fully configurable CPU Voltage Regulator!

Atheatos 2022-04-19 | Today's Lab-Rat is my Soyo 4SAW2 486 Motherboard.
Last time I modded an Any-clk device into this one.
This now allows me to set the bus clock at will!

In this video I come back with 4 more mods!
1) Added a proper PS/2 port for the Mouse.
2) Replaced the CMOS battery with a lithium one.
3) Recapped this completely (ok I overdid this part a bit).
4) Modded the CPU voltage regulator to gain more flexibility.

The last one was done in the most elegant way
by just adding a resistor and changing 3 others.
The result is that by using the same 3 jumpers this
can now be configured to 8 different Vcore settings.
Form 3.66v to 4.36v with a step of ~0.1v.

Correction!
The deference between Electrolytic and Polymer Caps is in the Dielectric (not electrolyte).
The fist type has an Electrolyte Dielectric . The second has a Solid Polymer Dielectric .

-- TIMESTAMPS --
00:00 - Intro
01:32 - PS/2 Mouse Port.
03:06 - Lithium Battery Mod.
06:41 - Complete Recapping.
15:15 - Vcore Modding.
24:03 - Outro

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HangMan! A Freeware DOS Game written by me 20 years ago in Turbo Pascal.

Atheatos 2021-10-30 | Time for something new in this channel!
This is a Retro DOS game that I wrote nearly 20 Year ago!
This is the classic kids game Hangman on steroids.
It is written using Borlands Turbo Pascal.
Should be compatible with most retro systems.

This is released today for the first time (20 years anniversary edition).
It includes bug-fixes, visual improvements and an English menu.

Features:
- Play against an other players with words or phrases up to 40ch long.
- Play against the computer (random word from the included dictionaries).
- Both English and Greek languages are supported!
- Difficulty levels and an advanced timer function!
- Pre-configured and ready to play for Modern (Dosbox) or Retro PCs.

Download Link for the game:
drive.google.com/u/0/uc?id=1f_mCXUxjCQPoGuCgS0MDi9ujLsHMp_Cv&export=download

You can also get WinRAR here:
win-rar.com/postdownload.html

-- TIMESTAMPS --
00:00 - Intro
02:27 - The Game. All modes and options.
10:04 - A look into the code.
12:00 - Setting-up / Running my game.
15:44 - Final Notes.

I hope you play and enjoy my game.
This is released as a freeware!
Share it with the world!

If you really loved my game and only then...
you are allowed to donate to my PayPal:
paypal.me/galanopu

PC/104 Gaming Sound Card - Part 2: Now With MT-32 Compatibility Mode!

Atheatos 2021-09-22 | It is time for an update on my PC/104 Gaming Sound Card.

-- Updates to the Circuit --
- Tweaked output power amplifier
- Improved PC Speaker filtering and mixing.
- Added MT-32 compatibility mode for the onboard Midi Synth.

-- SPECS --
- ESS ES1869F (SB, SBp, WSS, ESFM)
- SAM2695 MIDI Synthesizer
- Game Port
- CD Audio in
- PC Speaker in
- Modern High quality Power Amplifier

In the last part of the video there are some Audio recordings from
popular games. The focus this time was on Roland MT-32 support:
- Monkey Island
- Zak Mckracken
- Prehistoric
- Lotus
- Warcraft II

Video with info about MT-32 from LGR:
youtube.com/watch?v=JiZOxUhQj10

-- TIMESTAMPS --
00:00 - Intro
01:31 - Audio Power Amplifier
03:34 - PC Speaker Info and Problems
09:24 - PC Speaker Future
10:57 - PC Speaker Examples / Comparisons
17:25 - Midi MT-32 Info and Problems
20:39 - My solution: MT-32 Compatibility Mode!
24:15 - Future Midi Products
25:30 - Game Examples, all modes
26:05 - Game: Monkey Island
31:28 - Game: Zak Mckracken
33:24 - Game: Prehistoric
37:01 - Game: Lotus: The Ultimate Challenge
41:50 - Game: Warcraft II
45:29 - Outro

I hope you enjoined this video.
Please give me your feedback ^^
Also visit my store here:
migronelectronics.bigcartel.com

Running the Cx/Tx 486DLC to the Limits! 386 replacement CPU with 1KB L1 Cache. Insane results!

Atheatos 2021-08-01 | Yea, the time has come for me to also test the Cx/Tx 486DLC chips.
These are 386 replacement / upgrade CPUs and have a cut down...
486 core with 1KB integrated L1 Cache.

As usual in this Video:
1) Historical details and similar models.
2) Full optimization guide.
3) Overclocking to the limit.
4) Many record breaking benchmark results!

Benchmark results:
drive.google.com/file/d/14_ykREU96xbaNaw0XX47ct8Hm7l1Pz-x/view

K2s Retro Workshop - Cx486SLC Video:
youtube.com/watch?v=xGWjQzge42o

CPU Galaxy - Ti486SXL2 Video:
youtube.com/watch?v=40TT2bBQ0bc

Other 486DLC Videos and Info (Necroware, Phil's)
youtube.com/watch?v=VTBPyrAzthw
philscomputerlab.com/cyrix-486dlc.html

Vogons "Register settings for various CPUs":
vogons.org/viewtopic.php?t=45756

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Support me with PayPal so I can bring you more Videos like that:
paypal.me/galanopu

Intel 80386DX, faster that AMD am386DX? Insane overclocking results!

Atheatos 2021-07-24 | Time to check the original Intel 386DX, the 80386DX.
Some general info and comparisons with the AMD am386DX.

Then pushed / overclocked to the limit.
I got again some insane fully optimized results.
Probably the fastest results recorded with this chip.

Is this chip faster than the AMD am386DX?
Can this break my 386 world records?
The answers in the Video! Enjoy :)

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Support me with PayPal so I can bring you more Videos like that:
paypal.me/galanopu

Bios Modding Tutorial for 386, 486 and Pentium PCs. Unlock hidden options in Award and AMI BIOS!

Atheatos 2021-07-18 | This is my full modding tutorial for Award and AMI BIOS.
The main goal is to unlock hidden options.
Solutions for both Award and AMI Bios are presented.
This tutorial is applicable to 386, 486 and Pentium systems.
Might be also useful for older and newer system too.

Three BIOS modding tools are presented:
1) Modbin v4.50 (for Award BIOS)
2) AmiBCP v7.60 (for newer AMI BIOS)
3) AMIsetup v2.99 (for OLD AMI BIOS)

Something I missed regarding Modibin in the Video:
Pressing F2 in the main screen will give you a preview of the Bios Menu!!

Vogons AmiBCP Thread:
vogons.org/viewtopic.php?t=49754

Bios Tools:
drive.google.com/file/d/1XhtpVIPkBvDu0Sf3RhM4JMXcfDtpwT5k/view

I hope you liked this Video Tutorial!
Please like, comment, share and subscribe for more!
This is very important for my growing channel.

Support me with PayPal so I can bring you more Videos like that:
paypal.me/galanopu

386 Motherboard Review / Optimization Guide: 367C Rev 1.0 (Unichip U4800-VLX) .

Atheatos 2021-07-10 | This is a full review and optimization guide on my 2nd 386 Lab-Rat.
This is an 367C Rev 1.0 board than has the Unichip U4800-VLX.
This board supports the write back scheme for the Cache memory.
Will this be any fastest than my first board?

I hope you enjoyed this Video...
Please like, comment, share and subscribe for more!
Support me with PayPal so I can bring you more Videos like that:
paypal.me/galanopu

ISA Clock measuring device is now available! Now at Ver: 1.01 with improvements.

Atheatos 2021-06-25 | My ISA Clock device is now available in the store.
This measures the ISA / AT clock in real-time and with high accuracy.
Basically the ISA / AT variation of the popular PCI Clock device.

ISA-clock Ver: 1.01 Specs:
Frequency range: 1.28 to 40.95 MHz
Resolution: 10KHz
Error on the display: +-5KHz!

Compatible with all ISA / AT slots.
High quality constriction with durable gold plated contacts!
Fully protected against accidental inverted insertion.

Please visit my store if you want some of these:
migronelectronics.bigcartel.com

Am386DX Beyond the moon: A never ending modding story. Bios Mod, unlocking / optimizing all options.

Atheatos 2021-06-24 | Here I am again my 386 motherboard (M326 v5.2).
One more mod and all records broken again.

This time I replace the original AMI Bios with an Award one.
The Bios is stored in an one time programmable chip PROM.
So I had to use an programmer and and a new chip.

Then I modified this Bios with Modbin to enable all options.
Finally I optimize these options and present my results.

I hope you enjoyed this Video.
Please like, comment, share and subscribe for more!
This is very important for my growing channel.

Support me with PayPal so I can bring you more Videos like that:
paypal.me/galanopu

Custom clock generator for Retro systems Any_Clk. A new era of Retro Overclocking?

Atheatos 2021-06-18 | My custom clock generator "Any_Clk" is finally Here!

With this device it is possible to set the CPU speed of nearly any retro system
(from the first IBM XT to the 486 and Others) at any rate!
These are very versatile, and probably have even more uses.

Available in two versions and multiple colors:
The Vertical can be place in the position of a jumper.
The Horizontal version is a drop-in replacement for for DIP-8, DIP-14 oscillator!

In this video I analyse all the details regarding this device.
I give recommendations and examples of its usage.
And finally I mode two more motherboards:
1) 386: 367C REV 1.0, UNICHIP 386WB (U4800)
2) 486: Soyo SY-4SAW 2, (SIS 85C496)

Please visit my store if you want some of these:
migronelectronics.bigcartel.com

Link to the product manual:
drive.google.com/file/d/1jVk1lAI2c5usXpC9Z70oIbCGQQpCnffq/view

Landing the 386 to the moon! New VDD Mod! New Am386DX overclock record at 55Mhz.

Atheatos 2021-06-02 | Another video for the channel... 1-2 new mods...
and a new overclocking record for my 386 machine.

This time at 55Mhz. 10% faster that the previous best!
I got there by testing multiple chips and modding the power supply of the CPU.

Multiple benchmark bests were set here.
Doom (high detail) crossed the 10FPS mark for the first time!
Doom is now basically playable at medium details!
Please enjoy the video for more details!

I hope you liked this video.
Please help the channel grow!
Like, comment, subscribe and share.

Support me with PayPal so I can bring you more Videos like that:
paypal.me/galanopu

General MIDI Synthesizer on a Motherboards Game Port! G_Dream_Max is now Available!

Atheatos 2021-05-20 | My General MIDI Synthesizer device is now available for sale.

As a demonstration in this video I am using this device not on a sound card but on a motherboard with an integrated one.
Thus with this it possible to play dos games with beautiful MIDI music even when using an integrated Sound Card solution.
The device is based on the Dream SAM2695 chip (same one used in the very popular Dreamblaster S2).
This has a Gameport interface, so the installation is very easy on any device with a Game Port with an MPU-401 interface.
This also has a Game Port Pass Through and come with all required accessories.

In the Video I messed up the volume level (too Low) for the FM-Synthesiser of the Doom run.
Balancing Music, Auido and my Mic is not so easy while recording.

You can also check the original presentation Video of this device:
youtube.com/watch?v=mczPM--sb7g

Via_Audio driver used for this Motherboard:
drive.google.com/file/d/1uaUEtuc9lQG_IYDUp_nLIdm3xlziCUb_/view

Please visit my store if want one of these...
migronelectronics.bigcartel.com

386 Motherboard Mod: 128 KB to 256 KB of cache! New Quake record set.

Atheatos 2021-05-12 | I modded my M326 v5.2 motherboard from 128 KB of cache to 256 KB.
Now this is one of the very few (if not the only) Baby AT 386 motherboards out there with 256 KB of cache.
In the end, the effect of this mod was not that significant in performance.
But I think this was an interesting one and I enjoyed doing this.

I also managed to stabilize at 50Mhz with a math co-processor (FPU).
So in the end a new personal record in Quake was set (using the am386DX).

I hope you enjoyed this... please like, comment, share and subscribe for more!
Support me with PayPal so I can bring you more Videos like that:
paypal.me/galanopu

Simm-30 FPM Showdown! New 45ns memory modules! New 386 overclocking personal record with 0WS.

Atheatos 2021-04-11 | This video is all about Simm-30 FPM memory modules.

1) I compare 5 different memory kits and how well they do with my overclocked 386 machine.
2) I discus the technical differences and details of different implementations. Compatibility concerns.
3) Present my brand new 1MB, 45ns FPM modules.
4) I break my previous 386 overclocking record, with 0WS!

Benchmark results (There is an error in the xls file at the video. The boost from OC is 2.3%):
drive.google.com/file/d/1jY2zg_zblb2XY-zYJjS97sX0CcbYN3Zz/view

If you want some of these, visit my store...
migronelectronics.bigcartel.com

PCI clock measuring device is now available! Ver: 1.01 Improvements. ISA clock is coming soon!

Atheatos 2021-04-06 | PCI-clock is now available in the store.
Please check first the original video for this device:
youtube.com/watch?v=QmJi0tpL7kc

In this video I show a bit of the back-stage stuff.
I also discus the improvements done to this Ver: 1.01.

PCI-clock Ver: 1.01 Specs:
Frequency range: 10.24 to 81.92 MHz
Resolution: 10KHz
Error on the display: +-5KHz!

Finally some news regarding the upcoming ISA-clock device.

If you want some of these, visit my store...
migronelectronics.bigcartel.com

Overclocking, Underclocking the 386 with a custom clock generator. 2Mhz to 50Mhz, ~0.5Mhz step!!

Atheatos 2021-04-03 | This Video is about:
1) Modding my M326 v5.2 motherboard (int. Am386DX-40 cpu) to accept an external clock source.
2) Testing the Overclocking limits using my 50ns FPM memory modules and a custom clock generator.
3) Underclocking in order to get a playable experience with old, timing sensitive, IBM PC-XT (8088) games.
4) Benchmarks and more mods.

The system can run from 2MHz up to 50MHz with ~0.5Mhz steps!!

Benchmark results:
drive.google.com/file/d/1NVRv5TJsmGc_x3voGtSJW1nq3I4okHNb/view

Speed sensitive IBM PC-XT games:
drive.google.com/file/d/14bnG_hMGu6oCgg5whxSzpuPcFRvqUIJO/view

I hope you enjoyed this... please like, comment, share and subscribe for more!
Support me with PayPal so I can bring you more Videos like that:
paypal.me/galanopu

Original Hardware: PC/104 Gaming Sound Card, ESS ES1869F + Dream SAM2695 MIDI.

Atheatos 2021-03-13 | This time I have for you something a bit more complex.
I designed this this PC/104 Sound Card in an professional way.

Specs:
- ESS ES1869F (SB, SBp, WSS, ESFM)
- SAM2695 MIDI Synthesizer
- Game Port
- CD Audio in
- PC Speaker in
- Modern High quality Power Amplifier

In the second part of the video there are some Audio recordings.
I tested some games. The focus is on PCSPK vs FMsynth vs MIDI.
Maybe I did not set the mixer perfectly in all these examples here.

About PC/104:
youtube.com/watch?v=Lchtj5H0YC0

ESS Audiodrive ES186X reviews:
youtube.com/watch?v=fWOdIuRO5fI
youtube.com/watch?v=Dc3ZAzk3nP8

SAM2695 MIDI Synthesizer review:
youtube.com/watch?v=3OhVLt6d5PY

I hope you enjoined this video.
Give me your feedback ^^

Pentium MMX (Tillamook core) overclocked to 420MHz. Faster than K6-2 ?

Atheatos 2021-03-09 | It is time to relive some of the experiences I had with PCs as a teenager.
The Intel Pentium MMX was the first CPU I ever overclocked!
So here I am 20 years later with an overclock of the Tillamook to 420MHz.

Pentium MMX (tillamook) Mods, Vogons topic:
vogons.org/viewtopic.php?f=46&t=30499

CPU Galaxy's Videos on the Tillamook CPUs:
youtube.com/watch?v=736iXRdXuTE
youtube.com/watch?v=l-GbiiuiCBY

Benchmark results:
drive.google.com/file/d/1x_7Iw9KkAVa6ePeoaf_33k2xY7J8sRGT/view

I hope you enjoyed this... please like, comment, share and subscribe for more!
Support me with PayPal so I can bring you more Videos like that:
paypal.me/galanopu

I have now added these modded CPUs to my store:
migronelectronics.bigcartel.com

386 System Review / Optimization Guide. MB: M326 v5.2 (PC chips) + VGA: TVGA8900D-R (Trident).

Atheatos 2021-03-02 | Just a review and optimization guide + a little bit of modding on this 386 system:
1) Motherboard: M326 v5.2, PC chips, integrated AM386DX-40
2) ISA VGA Trident TVGA8900D-R 1MB
3) ISA Multicard HMC HM83741Q

Benchmark results:
drive.google.com/file/d/1zkGaKdy_7wyDiLDI8gIsQRPicSWyz4dw/view

I hope you enjoyed this... please like, comment, share and subscribe for more!
Support me with PayPal so I can bring you more Videos like that:
paypal.me/galanopu

Original Hardware: General MIDI synthesizer with Gameport interface!

Atheatos 2021-02-25 | Two devices this time: G_Dream and G_Dream_Max.

These are Dream SAM2695 based, General MIDI synthesizers with Gameport interface.
Dream SAM2695 is the chip used in the very popular Dreamblaster S2.
So my synthesizer boards have similar performance.
The main difference is the interface change from the wavetable header to gameport.
It is like intergrading a Dreamblaster S2 and an Gameport adapter into one.

But you also get some extras here:
The basic G_Dream is so small that fits inside the standard DB15 connector!
The G_Dream_Max has Gameport pass through and the ability to drive headphones.

SAM2695 MIDI Synthesizer review:
youtube.com/watch?v=3OhVLt6d5PY

I hope you liked these two creations. Leave me a comment.
Like Subscribe so that you will not loose any updates!

G_Dream_Max is now available! Visit my store...
migronelectronics.bigcartel.com

Original Hardware: 50ns, FPM, Simm-30 Memory Modules!

Atheatos 2021-02-19 | This one is very straight forward.
I just made the fastest possible (50ns), Fast Page Mode (FPM), Simm-30 memory modules with parity functionality.

Custom, brand new, professionally done PCBs.
High quality 50ns Infineon chips (New-Old-Stock).
These are 4MB modules, for 16MB per kit of 4.

I have no idea if something like that was ever produced.
I have never seen FPM modules faster than 60ns.

Unfortunately, until now I have not found any way to push these modules to the limit.
My 386, 486 collection is very limited and with my boards even with generic 60ns modules you can basically max-out all settings.
I will continue looking into this, so subscribe if you do not want to miss any updates.

If you want some of these, visit my store...
migronelectronics.bigcartel.com

Original Hardware: PCI clock measuring device!

Atheatos 2021-02-16 | I have made this little original device that plugs into a PCI slot.
I measures the PCI clock in real-time and with high accuracy.
Maximum measured frequency: 80MHz, Resolution: 10KHz.

I find this device very useful when I try to figure out and tweak Retro PC Systems.
I will have a few pieces of this professionally manufactured and available very soon.
You can always contact me if you are interested.

I hope you enjoyed this Video.
There are more like that coming up soon!
Please like , share and subscribe, or just leave a comment below ^^

If you want some of these, visit my store...
migronelectronics.bigcartel.com

Asus P5A v1.06 with 1MB of Cache - Part 2: Setting 3DMark Records with K6-III+ @ 5 x 124 = 620 MHz.

Atheatos 2021-02-15 | This is part 2 of my review and optimization guide for this Asus P5A v1.06 - ALi Aladdin V with 1MB of Cache motherboard.

In the first part I have some corrections to the first Video.
Then I discus the AGP optimizations for ALi SS7 motherboards.

Finally I pushed this motherboard to the max and I achieved:
A 124Mhz bus with the M/B cache enabled and all the optimizations on!
Using my K6-III+ an overclock speed of 5 x 124 = 620 MHz was achieved.

I hope you enjoyed this... please like, comment, share and subscribe for more!

ALi AGP Driver package:
drive.google.com/file/d/1DKM8Db2KOjoevOD1ygdg5r60tlEOEknP/view

ALi IDE Driver:
drive.google.com/file/d/1y1z6e6FscSV0U0elmOT6aolc9qjLudzf/view

Updated Benchmark results:
drive.google.com/file/d/12_JgRPXbcj8jpw-Wle4RPh8-i7KYLC3w/view

Support me with PayPal so I can bring you more Videos like that:
paypal.me/galanopu

If you want one of these motherboards.. visit my store:
migronelectronics.bigcartel.com

Asus P5A v1.06 with 1MB of Cache - Part 1: The fastest Super Socket 7 M/B?

Atheatos 2021-02-09 | Yes what I have here is a very rare Super Socket 7 Motherboard with the ALi Aladdin V chip-set and 1MB of onboard Cache!!

This video is a complete review of this motherboard, including an in-depth optimization guide!
Some o the tips also apply to other SS7 and ALi motherboards in general.

Finally we have a 600Mhz showdown of K6-2, K6-2+ and K6-3+ processors.
In total 16 different configurations were measured in 12 benchmarks!!

There are VGA cards that can be faster that the FX5900XT for SS7 in some benchmarks / games. This is not the topic of this video, I will probably cover this at an other time.

Corrections on the V_I/O, Bus stability topic.
Here I run my tests at the 3.5V setting.
V_I/O plays a role in Bus stability.
Also at higher bus rates, the 1MB M/B had better stability.

I hope you enjoyed this... please like, comment, share and subscribe for more!
Check part 2 of this Video!!
www.youtube.com/watch?v=tdkc7IHZ-ug

Nvidia modded 53.04 driver by me... (only manual install)
Full support for FX cards. Faster than 56.64 and 100% stable with SS7 systems.
drive.google.com/file/d/1KbVAzWfvwH0JIplNieifs7VzFccx18rF/view

With ALi motherboards it is important to install the AGP Driver.
Sometimes when you install the VGA driver after that, some of the AGP drivers files are replaced.
This causes the monitor to go black every few seconds and the system is unstable.
The solution is to reinstall the AGP driver. Ver 1.9 is what I used.
drive.google.com/file/d/1FdFzMeSN3ceMfyuqRrvL30DWn_CN_3pu/view

Benchmark results:
drive.google.com/file/d/1xunzopgerarxyKMOeVOUoGyz-9SzNk6D/view

Support me with PayPal so I can bring you more Videos like that:
paypal.me/galanopu

If you want one of these motherboards.. visit my store:
migronelectronics.bigcartel.com

DC/DC Step-up Converter using 555 timer #2 | 12V to 40V

Atheatos 2011-03-01 | A minimalistic hi-efficiently regulated DC/DC Step-up Converter using a single 555 timer as the controller. Driving a 48V hard duty server Fan in the range of 12...40V with 12V input.

http://students.ceid.upatras.gr/~galanopu/555.doc
http://students.ceid.upatras.gr/~galanopu/555_circ.png

DC/DC Step-up Converter using 555 timer #1 | 5V to 16V

Atheatos 2011-03-01 | A minimalistic hi-efficiently regulated DC/DC Step-up Converter using a single 555 timer as the controller. Driving a 12V PC Fan in the range of 5...16V with only 5V input.

http://students.ceid.upatras.gr/~galanopu/555.doc
http://students.ceid.upatras.gr/~galanopu/555_circ.png