Tualatin mod for Coppermine slotket, Part 1 aitotat 2026-04-19 | I'm making a mod so I can add Tualatin support (Including VIA C3 Ezra-T and Nehemiah) to a Coppermine slotket.In part 1 we investigate what needs to be done and make connections for first slotket.Here is a link to the rom.by article that was the main source of information for me. I had to use machine translation (using Vivaldi web browser) to be able to read that:https://www.rom.by/articles/S370/index.htmAnother guide, with the same kind of slotket that I modify, is here. But it connects VTT and VCC voltages together and doesn't explain things well so I can't really recommend that one:oocities.org/_lunchbox/generic_slotket_mod.html00:00 Intro05:01 Socket370 pinout16:36 Voltage glitch21:29 Clearing the pins30:57 Isolation with PCB varnish33:32 How good was varnish?40:00 Epoxy instead of varnish43:21 Pinout on actual Tualatin MB56:41 Installing pin headers01:03:17 Clearing pins for soldering01:05:41 Soldering wires to isolated pins01:21:28 First connection done01:27:03 Testing unmodified slotket with PPGA Celeron01:30:59 Does Tualatin work?01:34:38 Testing VIA C301:42:29 Testing 1,475V Celeron
X-Fi SB0880: unplanned repair with unexpected fault aitotat 2026-09-13 | My PCIe Sound Blaster X-Fi SB0880 had issues when recording from Line-IN. The left channel had lower volume than right.I expected capacitor issues but the actual fault was something else. Although the capacitors...G-Luxon datasheet can be found here:scribd.com/document/608259342/g-luxon00:00 Intro04:47 This is how the fault sounds like11:33 What to do?15:26 Donor board23:04 Desoldering29:49 Time to test31:59 Replace capacitors that will most likely fail35:32 Lets measure those 3 capacitors42:37 Heatsink?46:30 Final look before EMI shield48:48 Does heatsink fit?53:02 Quick look on Audigy2 and PCI X-Fi
How to mod waveblaster (wavetable) connector to AWE64 aitotat 2026-09-05 | When Creative got bugs fixed on Sound Blaster AWE64 cards, they removed the Waveblaster connector. So lets mod one to AWE64 CT4500. Finding correct pinout for the connector proved to be a lot harder than it should have been. We'll also take a look if it is better to do DSP mod for AWE32.Here is the connection for the mod:drive.google.com/file/d/1bNjx34AnDN-oSRC2H6MjUu0H1W8azTvk/view?usp=sharingRevision 2 (20.9.2026):+5V is now digital +5V (was analog before)+12 and -12V are now analogCreative Waveblaster I and II pictures are fromhttps://www.wavetable.nlThere are lots of game music comparisons and information about the MIDI boards.Topwave32 picture is taken from:vogons.org/viewtopic.php?p=148612#p148612Incorrect pinouts seen on the video are from:epanorama.net/documents/pc/waveblaster.htmlSort of correct pinout can be found at:en.wikipedia.org/wiki/Creative_Wave_BlasterGameport pinout can be found at:simple.wikipedia.org/wiki/Game_port00:00 Intro03:19 AWE64 CT450005:56 Could Windows95 have something to do with losing SIMMs and Waveblaster header?08:21 Why do I have CT4500 here?09:01 Story time12:59 Pinouts and pinouts and pinouts...19:37 Finding position for the header21:37 Recapped and ready for modding28:15 Points of interest29:08 Reset31:30 Quick look on the AWE64 Gold33:51 Where to connect audio?38:50 Line-in it is41:48 MB_PRO can mess our line-in43:48 MIDI connections44:20 Voltage as well47:48 Place for the header54:32 Wires01:01:54 Time for testing01:03:47 Lets not forget to enable Line IN01:04:39 Stereo channel test01:07:09 AWE32 comparison01:08:00 Channels are now correct01:08:39 How does this fit in the case?01:12:04 MIDI In or Out?01:14:07 Gameport to MIDI adapter01:15:25 How to connect external MIDI module01:18:21 Finally the IN and OUT confusion explanation01:21:16 My pinout for the mod01:22:29 Final words
Making a new front bezel for the P3B-F build aitotat 2026-08-19 | I'll start making a front bezel from wood for the P3B-F build. I don't like the original front bezel. It does not have reset button and it has this inflated look that became common at the time. I want this to look a bit older to better look like a DOS system.But since making a new bezel, certainly some useful stuff can be added there properly hidden away.00:00 Intro04:12 CF reader somewhere06:03 Do I need USB?08:18 Should I add Line/Mic in and SPK out as well?09:40 Almost essential for a DOS system: MHz display12:40 Not just for the MHz16:03 Drive covers16:56 Not as easy at it seems
Recapping and testing Nexus 350W (FSP group) ATX 5V heavy PSU aitotat 2026-08-06 | Old Power supplies, especially those around year 2000 from the capacitor plague era, needs to be serviced so they are safe to use. Using modern 12V heavy PSU to replace old 5V heavy PSUs can be risky (too little load on 12V rail might cause the modern 5V rail to overheat, for example, or the modern 5V rail can simply be too weak for your old system) so why not service a 5V heavy PSU if you can?I replace capacitors, service cooling fan and do some ripple etc measurements to make sure the power supply is good.Note!I installed the fan upside down so it is indeed wrongly put back together. It is easy to fix but I noticed it a bit too late. The PSU is supposed to suck air from inside the computer and blow it out.Here is the review from NX-3500 done by SilentPCreview back in the day:silentpcreview.com/nexus-nx3500-120mm-psuYou can find links to ATX specification PDFs on Wikipedia ATX page:en.wikipedia.org/wiki/ATX"ATX/ATX12V Power Supply Design Guide" versions 1.1 and 1.3 are the ones relevant here.00:00 Intro03:31 Review conclusion from 200307:52 Almost 2 year difference11:45 Lead free solder14:48 PCB finally removed16:29 PCB comparison25:26 Should those wires be desoldered?28:40 Glue removing32:10 First three capacitors removed41:10 Small PCB51:14 Identifying 3.3V and 5V rail smoothing capacitors01:00:44 Different smoothing capacitor for 12V rail01:04:26 Standby smoothing01:08:21 Capacitors under heatsink01:10:48 Last to be desoldered01:14:53 New smoothing capacitors01:18:20 AC mains caps01:23:59 Temperature sensor01:24:54 Cooling fan01:34:05 Back together01:44:58 Measuring ripple01:59:14 Bonus content: ripple measurements for unserviced 300W Nexus02:09:19 Let's measure old capacitors 02:19:37 Measuring new smoothing caps
DOS/Win98 build with Asus P3B-F, benchmarks (C3 Nehemiah vs others) aitotat 2026-07-14 | I benchmark VIA C3 CPU against VIA C3 Ezra-T, Pentium 3 Katmai and Coppermine and Tualatin Celeron. Target is to find optimal CPU for a multi-purpose build covering (especially) DOS and Windows 98.I also test several potential graphics cards (and some that are interesting otherwise). Potential GPUs are:Voodoo 3 3000GeForce 2 GTSGeForce 4 Ti 4200Interesting for other reason or just for comparison are:Riva TNT2Radeon PigletPowerVR KyroGeForce 4 MX (AGP8x version. Tested on DOS only) Spreadsheet seen on the video can be found at:docs.google.com/spreadsheets/d/1o6_yYRpdOfKpeh9Mfhe1hzLSsiVU-r6RjGqi7azgydw/edit?usp=sharingDOS Benchmark Pack can be found at:philscomputerlab.com/dos-benchmark-pack.htmlMIDITO can be found at:vogons.org/viewtopic.php?t=83629SETMUL can be found at:vogons.org/viewtopic.php?t=38613P3BF Slowdown Utility can be found at:vogons.org/viewtopic.php?t=11152200:00 Intro01:59 TNT2...You can't be sure what you get04:29 What are the Windows tests?09:26 What are the DOS tests?13:08 Speed issue tests13:21 Error 20014:37 OPL tests22:48 Nehemiah vs Katmai32:41 Nehemiah vs Tualatin Celeron45:22 Nehemiah vs Coppermine47:20 Nehemiah overclocing49:03 Imaginary PR rating for Nehemiah50:11 Nehemiah vs Ezra-T52:13 Ezra-T overclocking54:15 Nehemiah with Voodoo357:41 How does Ezra-T compare to Katmai and perhaps Pentium 2?59:48 Ezra-T, king of all 486 CPUs01:08:31 Nehemiah on DOS01:19:48 Does DOS video performance matter?01:21:41 Memory latencies on DOS01:24:56 ESFM is less speed sensitive but..01:27:01 Delaying OPL access with MIDITO01:35:29 Tualatin on DOS01:36:55 Some things I forgot to mention01:37:22 PowerVR Kyro01:40:55 PC Player SVGA flickering01:43:02 Later GeForce == slower DOS (DOOM)01:49:33 What I'm going to use on my build?
DOS/Win98 build with Asus P3B-F part 2.9, re-repairing the mobo (IRQ issues with ISA sound cards) aitotat 2026-06-28 | I'm having different IRQ related issues with two ISA sound cards and failed floppy drive with one sound card. I suspect the motherboard and there is a short somewhere.00:00 Does fixed slotket/socket survive CPU change?06:46 What is wrong with the motherboard?12:52 Another (broken) Asus P3B-F16:03 Unpopulated capacitors25:14 ISA slot desoldered28:14 Inspecting the I/O controller31:23 Need to solder ISA slot back39:59 Final testing
P3BF Slowdown Utility aitotat 2026-06-12 | This is introduction (and a bit of making of) video for P3BF slowdown utility. It is used to change FSB speed from DOS prompt. It is meant for Asus P3B-F but it will work on other motherboards with same clock generator (ICS 9250-08) and Intel BX chipset (or rather PIIX4/E/M southbridge).Vogons thread (with download link):vogons.org/viewtopic.php?t=111522SetMul can be found at:vogons.org/viewtopic.php?t=38613Links to sources mentioned in the video:mail-archive.com/coreboot@coreboot.org/msg26307.htmlvogons.org/viewtopic.php?p=1190013#p1190013vogons.org/viewtopic.php?t=4034800:00 Why I made P3BF Slowdown Utility?05:55 Proof of concept07:19 How slow can we get?11:11 P3B-F Slowdown Utility release 1 15:30 Soft reboot won't reset FSB18:42 Another issue22:42 Why wasn't the Clock generator visible on Asus P3B-F?32:42 How to program clock generator?40:51 Last words
DOS/Win98 build with Asus P3B-F, part 2 aitotat 2026-06-01 | This is part 2 of the Asus P3B-F based DOS/Windows 98 build. Well, nothing really is going according to plan so progress is slow.This part covers VIA C3 Nehemiah issue with over 512MB RAM, and also other RAM related problems and issues (Windows 98 limit, BX-chipset related).I'll also fix a Sound Blaster Audigy 2 but failed to record that it was broken. But all four removed capacitors are tested bad.Links mentioned in the video:Audigy 2 crackle fix:vogons.org/viewtopic.php?t=56327Guide for installing Audigy drivers:vogons.org/viewtopic.php?t=71449Unofficial Asus P3B-F BIOS:vogons.org/viewtopic.php?t=69345Vogons thread where the Nehemiah memory limit was mentioned:vogons.org/viewtopic.php?p=562176&hilit=nehemiah%20640mb#p56217600:00 Attempt to fix broken socket07:16 Case assembly09:16 Taking a look at the DVD drive14:59 Mounting motherboard18:53 IO shield20:38 HDD22:10 Floppy drive 24:22 5,25" drive hole issues25:19 New holes26:12 Wires30:03 LBA4837:27 What to do with another PSU?42:35 Now ECC DIMMs? When is this ready?46:51 Get to the point already!50:59 Unbuffered DIMMs I chose here53:39 Do the ECCs work?59:02 Strange CT3930 issue01:01:28 ECC memtest01:02:36 Is the slotket now fixed?01:09:56 Celeron overclocking01:12:22 Nehemiah memtest with 512MB vs 768MB01:13:51 Back to Celeron overclocking01:17:07 Alaternative OPL3 card01:18:00 Fixing Audigy201:21:32 Final words (finally)
DOS/Win98 build with Asus P3B-F, part 1 (parts and PSU inspection) aitotat 2026-05-14 | This is first part for building a DOS / Windows 98 system where DOS is the primary OS.In this part one, I test what graphics card are 89MHz AGP compatible. I use Necroware's Video Memory Tester for a quick DOS-based test. Tester can be found at: github.com/necroware/video-memory-testerI also select possible sound cards for DOS and for Windows. This build is going to have several sound cards.But biggest part of this video is about refurbishing a power supply. Sometimes older is simply better.00:00 How I quickly tested support for 89MHz AGP01:41 Why I chose this ATX case10:43 Possible graphics cards19:57 Choosing sound card(s)19:59 Orpheus II21:07 Sound Blaster AWE64 Gold21:50 Terratec EWS64XL28:17 CT393029:10 What GUS?32:26 Need to test SBlink as well34:32 PCI sound card for Windows42:40 Network card43:30 IDE controller?44:07 Comparison CPU45:41 Optical drive47:08 RAM and HDDs48:02 Power supply53:54 Comparing to Nexus PSU58:29 Recapping completed01:11:16 Ripple01:16:40 Bad PSU for comparison
Tualatin mod for Coppermine slotket, Part 2 aitotat 2026-04-29 | I continue where I left in part 1. I modify anothet slotket but now with optimized desing. There is also a fix for the voltage glitch.00:00 Intro16:38 BSEL jumpers19:11 Placing pin headers37:18 Jumper A wire with resistor40:17 Jumper B wire41:42 Finally jumper C and D to correct pins43:49 X34 is not isolated properly51:01 X34 pin broke57:37 Fixing a broken pin01:01:37 Exposing new X34 pin01:09:57 VID wires01:18:46 Placing socket cover back on01:20:35 Slotket cover01:23:49 Voltage glitch with 1.475V Celeron01:24:30 Fixing the voltage glitch01:31:38 When does the BIOS set voltage?
Asus P3B-F testing, repairing and modding, Part 2 aitotat 2026-03-25 | This is the second part of Asus P3B-F repair, modification and recapping video. You should watch part 1 first: youtu.be/wSaIRRmIdSgIn part 2 we find and fix the fault, add second ISA slot and replace all capacitors.You can find the modified BIOS at:vogons.org/viewtopic.php?t=69345or directly at:https://oezmen.eu/bios/00:00 Preparations01:50 Do we have clock?06:03 What gets to CPU?07:58 Problem found!11:52 How can removing SMD capacitors be this hard?19:50 Where to get replacement?26:59 Removing I/O chip from donor board29:51 Soldering replacement chip36:38 First try with replaced chip37:48 Adding second ISA slot56:44 New capacitors01:01:46 Recapping 01:18:01 Testing removed capacitors01:23:28 Testing the motherboards
Asus P3B-F testing, repairing and modding, Part 1 aitotat 2026-03-18 | I'm explaining why Asus P3B-F would make a nice motherboard for retro systems. I test two motherboards before recapping and modifying them but the other board is broken. Basic troubleshooting doesn't reveal anything so fixing (and mods) will be done in part 2.00:00 Asus P3B-F05:36 Slotket07:33 Couple of P3 and Celerons11:12 VIA C3 Ezra-T and Nehemiah17:01 Is Slot 1 better than Socket 370?21:33 What good would second ISA or SBlink do?22:11 Testing first23:39 Testing with PSU made in 2016 that could be from 200029:17 PSU power ON30:18 Testing first Motherboard32:55 Powering my P3B-F35:20 Dead motherboard?39:37 Re-testing my P3B-F43:44 MB inspection46:57 Removing suspicious capacitors49:34 Testing suspicious capacitors59:26 Suspicious capacitors replaced01:00:30 Is our BIOS bad?
Testbench testing (PC Chips M919) part 2 aitotat 2026-03-11 | Second part of my testbench testing video. In this part we test HDD bios limit, Sound card that requires -5V, a PnP Sound card, slowing the CD/DVD-drive with CDBQ and de-turbo speed issues.You can find CDBQ at https://tools.dosforum.deIf you are looking for a good DVD-RW-drive for DOS retro systems, I've found these two to be the best (they have perfect CDBQ support):NEC ND-3520ANEC ND-3540A0:00 Changes since Part 13:50 Hitachi 40GB HDD5:54 Strange HDD size limit on this BIOS10:14 15 heads16:39 8GB Seagate U821:22 Old BIOS23:49 Hitachi 15 heads jumper27:15 PC-DOS 7.131:10 Sound card that uses -5V36:18 PnP sound card39:45 DVD drive testing45:13 CDBQ50:30 Turbo switch52:15 A good DVD drive53:17 UMC IDE drivers59:55 De-turbo benchmarking62:35 Space Quest 4 with working sound
Testbench testing (PC Chips M919) part 1 aitotat 2026-02-25 | I'm testing my testbench that is based on PC Chips M919 motherboard. Part 1 contains BIOS update, CPU testing, L2 cache slot voltage measuring, RAM testing and VLB testing.7:55 Cannot boot from microdrive9:55 XTIDE Universal BIOS and Lo-tech XT-CF10:38 BIOS update27:26 L2 voltages32:00 CPU testing46:56 Memory testing59:23 VLB testing
VGA Capture does not support VGA and Trident that does not output true VGA aitotat 2026-02-11 | I'm testing VGA Capture bought from Aliexpress and because it does not support VGA, I need to use Trident Cyber 9385T based PCI graphics card that scales low resolutions to 800x600.
AWE32 CT3900 revision differences aitotat 2026-02-03 | I'm investigating differences between Sound Blaster AWE32 CT3900 revisions 1 and 2. And why is there a factory mod on the revision 2 card?
Building a retro PC test bench aitotat 2026-01-22 | I'm making a test bench so I can easily test cards etc for retro PCs.
Sound Blaster AWE32 CT3990 de-CQM, DSP replacement and recapping - Part 2 aitotat 2026-01-08 | Part 2 of the AWE32 modding video.I'm sorry about the low picture quality on the second half of the video. I'll do my best to improve for upcoming videos.You can find fixed DSP image from S95Sedans github page:github.com/S95Sedan/CT1741_DSPI used v417-8k_1.0.bin on this video.Capacitor list for CT3990:16 x 4,7µF, ø4mm6 x 1µF, ø4mm (+2 for deCQM mod)2 x 2,2µF, ø4mm4 x 10µF, ø4mm (+1 for deCQM mod)6 x 100µF, ø5mm2 x 470µF, ø8mm
Sound Blaster AWE32 CT3990 de-CQM, DSP replacement and recapping - Part 1 aitotat 2026-01-01 | In the first part of the video we replace CQM with real Yamaha OPL3.This wouldn't have been possible without instructions on Vogons de-CQM thread:vogons.org/viewtopic.php?t=57746
XTIDE Universal BIOS beta2 aitotat 2012-09-21 | XT-IDE and XTIDE Universal BIOS on IBM 5150. Creating partition to Hitachi 6 GB Microdrive using DOS 6.22 boot disk.
