Uploaded April 2022 | Updated September 2026, 1 week ago
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
This one had a lot of work. I hope you will enjoy it!
Please like, comment, share and subscribe for more!
Support me with PayPal so I can bring you more Videos like that:
paypal.me/galanopu
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
This one had a lot of work. I hope you will enjoy it!
Please like, comment, share and subscribe for more!
Support me with PayPal so I can bring you more Videos like that:
paypal.me/galanopu
