Hacking a 486SXLC2 (8KB of L1 Cache) into a lucky 386SX Motherboard. Insane performance boost!
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:
• 386SX Motherboard Review (SARC RC2016...
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:
https://docs.google.com/spreadsheets/...
K2s Retro Workshop - Cx486SLC 50Mhz Video:
• Overclocking the 486SLC-33 to 50MHz!
Vogons "Register settings for various CPUs":
https://www.vogons.org/viewtopic.php?...
-- 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:
https://paypal.me/galanopu
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