feipoa wrote on 2022-08-17, 18:51:

This mod is still on my list. The ICs have been sitting in a bin; I'd have to take the motherboard out of the case though. Did you just replace those 8 chips, or was there more to the mod? Did you use solder paste, or solder the pads one-by-one with a contact-based soldering iron?

When you say that 1024K is better than 256K, did you run any numbers to demonstrate the comparison?

Are you running the PF110 CPU? My system has the PF110, so I was concerned that perhaps the higher FSB might cause issues with 1024K vs. 256K using the same memory timings. This is an issue I've witnessed on socket 3 boards.

Just two Weller soldering irons to remove the chips and one to put the replacements. Although I could do it with a heat gun, too.

The board has the necessary layout for 32-pin async SRAMs with evolutional pin-out. CE2_H pulled high to Vcc, new Vcc is pin 32, A15 and A16 routed properly. The BIOS takes care of cache size detection.

It's an overclocked P80. I don't have a PF Nx586 yet, though willing to pay a fair price for it. Also I didn't record specific benchmark stats, but the improvement was noticeable. 70ns FP memory isn't really fast, so large cache helps. Nx586 runs it on a separate bus, half the CPU clock, with an internal tag. It's not shared with the system bus. I think 10ns cache chips are an overkill in my case. 12ns or even 15ns should do just fine.

That's before the mod. Speedsys confirms there are 192Kb of cache accessible out of 256Kb.

Tiido wrote on 2022-08-17, 19:00:

This is in my todo list also, chips are ready but there is no time to deal with it...

Which CPU are you running in yours? I had been hoping that someone else would do the 1024K cache modification on something with a PF110 and preferably with a fully setup system for testing in Windows.

It has a P90 in it, so nothing special. The better CPUs cost far more than what I paid for the entire machine so I am unlikely to ever see an ugrade to it 🤣

elianda wrote on 2016-10-25, 02:21:

I finished? my Nx586 sytem and you can read about it here: http://retronn.de/imports/nexgen_nx586.html
Now dust off your NexGen systems for some comparison scores 😀.

Sorry for bothering you.
0:14 second on your video https://www.youtube.com/watch?v=41O2bNG2qKA
Can you share all files in folder /TOOLS/NG ? Please attach them to this forum.
I'm guessing this folder is for tools for NexGen.
Thanks!
p.s. I tried to find them on your FTP, but no success.
p.p.s. Part of them I found here https://theretroweb.com/drivers/261

Hello Max,

I think the stuff should be on ftp://retronn.de/driver/CPU/nexgen
Though, here is the NG folder zipped:

I was wondering about this PCCHECK.EXE. Thank you. It looks like it's something relatively modern.

elianda wrote on 2024-11-30, 01:16:

Hello Max, […]
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Hello Max,

I think the stuff should be on ftp://retronn.de/driver/CPU/nexgen
Though, here is the NG folder zipped:

The attachment NG.ZIP is no longer available

Thanks for sharing this file set, it was helpful in getting this IMC / Alaris desktop up and running! Had to replace some bad RAM, source a replacement hard drive and swap a bad CD-ROM drive with something that was a similar shade of beige... So far I'm liking the PicoGUS better than the Yamaha OPL3-SAx cards I often use in retro builds, which seemed to have some weird speed/timing issues in this specific machine that the PicoGUS is not exhibiting. Normally I run them together but in this system it will probably just stay PicoGUS only.

The Alaris "Skyeagle" (NCR chipset) VLB graphics card is fast but seems to have some banding issues with the Dell 20" LCD I'm testing with in some software, I believe there were some DOS VESA drivers for the card/chipset but I haven't tracked those down yet.