Re: Help! HIMEM errors after Enabling L2 Cache
Posted on 2017-04-28, 20:42
I find CPUMark99 the most sensitive to L2 cache and if all RAM is cached.
Re: Undervolting Cyrix cpu
Posted on 2017-04-28, 20:29
Well, if it doesn't work at 4x, you could request Jan to mod your BIOS for 4x support.
Re: Let's restore my 486 motherboard - AOpen Vi11
Posted on 2017-04-28, 20:25
256K is a nice common number for cache; I like to max out [double-banked] cache on all motherboards. You need 256K of direct-mapped cache for 32 MB to be cached in write-back mode, or 64 KB to be cached in write-through mode. Although 386 boards only use write-through L2 cache and usually have a …
Re: Help! HIMEM errors after Enabling L2 Cache
Posted on 2017-04-28, 04:04
Its a PC Chips board? I'm not surprised at all by your troubles. I wouldn't be so quick to blaim the COAST module. Did PC Chips ever make fake pipeline burst cache?
Re: 486 and cd rom drives
Posted on 2017-04-28, 03:40
Responding to the original post: It has been my experience that many onboard older ISA IDE controller cards do not seem to work with my IDE CD-ROM drives, even after trying several DOS drivers. I didn't dissect the problem in detail; instead bought an ISA card which was intended only for CD-ROM …
Re: Let's restore my 486 motherboard - AOpen Vi11
Posted on 2017-04-28, 03:29
Sounds like either your cache is bad, your motherboard jumpers are incorrect for 256K, or your motherboard/chipset did not properly implement 256k. Ruling out the former should be pretty straight forward. For my perverted computer interests, an early 486 or any 386 board must work properly with 256K …
Re: Let's restore my 486 motherboard - AOpen Vi11
Posted on 2017-04-28, 02:29
But it passes DOOM fine with 128K installed?
Re: Undervolting Cyrix cpu
Posted on 2017-04-28, 01:47
Did you look at the MII's databook? I do not beleive the multiplier is set via registers. They seem to be set by the CLKMUL input pins on the CPU. The Clock Multiplier inputs are sampled during RESET to determine the MII CPU core operating frequency. CLKMUL2 CLKMUL1 CLKMUL0 If = 100 core/bus ratio …
Re: Let's restore my 486 motherboard - AOpen Vi11
Posted on 2017-04-28, 01:18
Did it pass himem's memory test as well? Might also try installing Windows 95 just as a stability test of sorts.
Re: Let's restore my 486 motherboard - AOpen Vi11
Posted on 2017-04-27, 21:29
the issue with having holes in the cacheable range is if you are benchmarking, trying to optimise the system, and the program is running in the hole, your scores could be reduced a lot and, thus, difficult to compare with others. I've seen score reductions at 50% because of this. Your DOOM score …
Re: Let's restore my 486 motherboard - AOpen Vi11
Posted on 2017-04-27, 12:00
CTCM7 will always hang on a 486 after finising up the check for L2 cache area. What I wanted to see was if all your RAM was cached and it does not appear to be. The L1 and L2 cache range for RAM are really odd. Something is up. Try re-running CTCM7 with 128 KB cache. Note that CTCM (not 7) will run …
Re: Undervolting Cyrix cpu
Posted on 2017-04-27, 08:28
Looking back at my emails from Jan, here are a few excerpts. "Your BIOS has support for Cyrix 6x86MX/MII multipliers up to 3.5x, but no Cyrix MII 4.0x multiplier support ... [after his BIOS mod] The 4x multiplier detection on the Cyrix MII works now. I took care of all the possible Cyrix multipliers …
Re: Let's restore my 486 motherboard - AOpen Vi11
Posted on 2017-04-27, 08:18
Those UMC chipset datasheets are impossible to find.
Re: Let's restore my 486 motherboard - AOpen Vi11
Posted on 2017-04-27, 04:48
I have seen cases with 386 boards which claim to support 256 KB, but have all kinds of issues when 256 KB is actually installed. The 386 boards I am thinking of contained a CHIPS chipset. On one brand of the board, I could only get 128 K running reliably. The other, only 64 K. Another user here was …
Re: PS/2 to Microsoft Serialmouse Adapter Converter
Posted on 2017-04-26, 09:50
w00t!
Re: Modern graphics on a 486
Posted on 2017-04-25, 04:49
That sapphire card looks OK, but not worth the shipping for me. Maybe someone else can test the Radeon 7000 in their 486?
Re: Modern graphics on a 486
Posted on 2017-04-25, 03:53
I had trouble finding a PCI Radeon 7000. Any modestly priced options out there? I indicated on page 1 of this thread that the Matrox G450 works with SiS 496 boards, but not UMC 8881 boards. However, even with SiS boards, I was unable to get the Win98 display drivers working with a 486 CPU. I did not …
Re: A Tale of Two 486 Motherboards (ALi vs SIS)
Posted on 2017-04-24, 07:33
If you are seeing "256K cache" when L2 is disabled, I think your motherboard manufacurer tweaked the BIOS to make the user think that the fake cache which came with the board is real. PC Chips did this scam with displaying text indicating that there is cache when there is, in fact, none. I assume …
Re: Let's restore my 486 motherboard - AOpen Vi11
Posted on 2017-04-24, 05:17
Did you play with cache and memory wait times? Or try cache from another board?
Re: PS/2 to Microsoft Serialmouse Adapter Converter
Posted on 2017-04-22, 22:49
Ok, thanks. I like the slot cover bracket idea. Is there a header to connect it a floppy-sized power cord, which offers +5 and +12 V?
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