Re: Cyrix 5x86 on older 5V-only 486 motherboards
Posted on Yesterday, 03:28
As the motherboard predates L1 writeback cache, the Cyrix chips have to run in write through mode.
Re: Sound Blaster CD-Rom Drives
Posted on Yesterday, 03:22
Don't forget SCSI. SCSI was the gold standard for CD-ROM drives before ATAPI came around. Most of the proprietary interface drives were just sold as a way to cut costs to speed up the adoption of CD-ROM drives for the consumer. Anyone aware of a proprietary interface drive faster than 2X? I've never …
Re: Cyrix 5x86 on older 5V-only 486 motherboards
Posted on Yesterday, 01:07
Chkcpu wrote on 2024-06-02, 11:48: Did you try running a Cx486DX or Cx486DX2 on this board? I just tested a ST486DX4-100. That one seems to work without issue.
Re: Cyrix 5x86 on older 5V-only 486 motherboards
Posted on 2024-06-02, 14:51
I don't have any Cx486DX or DX2 handy. The closest I have is an ST486DX4. I will test tomorrow. It's pretty amazing that the BIOS for the 486SV1 is from 1994, yet it doesn't really support any additional CPUs compared to what you'd find in a 1992 BIOS.
Re: Cyrix 5x86 on older 5V-only 486 motherboards
Posted on 2024-06-01, 13:50
Chkcpu wrote on 2024-06-01, 11:08: Please put a dump of your BIOS(es) up here and tell us for which boards you like to have a Cx5x86 fix. Hi, Jan. Here you are.
Re: 3 (+3 more) retro battle stations
Posted on 2024-06-01, 00:00
You always have to check the pinouts on tag RAMs. Sometimes you'll have two chips with the same number of pins and the same memory arrangement, but different pinout. Sometimes you get boards that need tags that were only produced by one company and almost impossible to find.
Cyrix 5x86 on older 5V-only 486 motherboards
Posted on 2024-05-31, 07:31
I was wondering if anyone has had any luck getting Cyrix 5x86 working on older 486 boards using an interposer with a voltage regulator. I've tried 3 or 4 boards mostly based on the 06/06/92 AMI HiFlex "color" BIOS, and the typical behaviour is that the monitor does not get a signal from the display …
Re: Reading the AMI BIOS chipset manuals from their old FTP site
Posted on 2024-05-30, 13:53
Thanks! I didn't realise it was compressed. If you search for z06 file extension, all you get is results for stupid corvettes.
Reading the AMI BIOS chipset manuals from their old FTP site
Posted on 2024-05-30, 12:25
On AMI's old FTP server they used to have a bunch of chipset specific manuals from the AMIBIOS. https://ia601900.us.archive.org/view_archive.php?archive=/15/items/ftp.ami.com/ftp.ami.com.tar I believe the manuals are in some kind of word perfect format. I could have sworn at some point somebody on …
Re: My Ultimate VL/EISA 486
Posted on 2024-05-30, 04:04
I made some small progress with the Award BIOS for Asus 486SV1 in the SuperEISA. MODBIN v4.50.60 will actually let you manipulate the BIOS image and save it. So far all I've done is rename the BIOS to MCC0001 to match the EISA CFG file for my SuperEISA. There are some chipset registers and Cyrix CPU …
Re: BIOS Wanted for A.I.R. 486EI EISA motherboard
Posted on 2024-05-30, 03:59
POD5V83 works in this board. Well, it POSTs, but I didn't get to fully test to see if both caches were working. Cyrix 5x86 most likely won't work with the AMI BIOS. I could not get 3x/4x chips working at all. The 2x/3x chips I can get "working" but it involves some hackery. You have to set the …
Re: BIOS Wanted for A.I.R. 486EI EISA motherboard
Posted on 2024-05-30, 01:39
Cyrix 5x86 is just simply too new and confuses the '92 core AMIBIOS. I've already tried all possible jumper combinations. I confirmed it's a BIOS firmware issue on another board using a 92 AMIBIOS, which I swapped for a '94 MR-BIOS. '92 AMIBIOS only knows about the classic 486s, 286, 386 and Cyrix …
Re: BIOS Wanted for A.I.R. 486EI EISA motherboard
Posted on 2024-05-29, 14:48
I just did a quick test with your BIOS. It is not corrupted. It works properly. So I guess you're happy, right? Sadly I'm a little disappointed. It seems like A.I.R. did little to nothing with this BIOS over the standard 6/6/92 release. The CPU is identified as a 486DX or 487SX. Though, the CPU …
Re: BIOS Wanted for A.I.R. 486EI EISA motherboard
Posted on 2024-05-29, 08:51
I had a look at the BIOS in a hex editor. I think it’s probably not corrupt. Unfortunately it looks like the same 1992 core BIOS that usually comes with the SIS EISA boards like my SuperEISA. I didn’t see anything that would indicate support for the DX4. However I saw something about power …
Re: BIOS Wanted for A.I.R. 486EI EISA motherboard
Posted on 2024-05-29, 07:51
A DS1287 or compatible isn’t going to cut it. It must be a DS1387 with the extra ram for the eisa config data.
Re: BIOS Wanted for A.I.R. 486EI EISA motherboard
Posted on 2024-05-29, 04:53
Wow. Thanks for the BIOS dump. I’ll have a look this evening. By chance are you trying to run your board without the Dallas ramified clock chip? That might explain why it doesn’t light up. I think it should be a DS1387 that goes in the empty socket. Maybe a DS1488
Re: BIOS Wanted for A.I.R. 486EI EISA motherboard
Posted on 2024-05-29, 01:11
At least we know it belongs to another VOGONS member. I just can't believe you didn't dump the ROM yourself. I presume you must have played with it before you re-sold it? Did you try the DX4 on it? And if so, did the BIOS report it correctly?
Re: S3 Gx2 memory expansion
Posted on 2024-05-23, 00:50
I own a Winfast S680 with the module. Do you need photos of it?
Re: 3 (+3 more) retro battle stations
Posted on 2024-05-14, 02:29
Jesus tits, that's a big pile of disk controllers. Most of the controllers I had back in the day were either winbond or UMC, with an occasional DTK PTI-217. You seem to have a lot of the more obscure ones. I think I have a PTI-227B, which is also based on a winbond chip. Is it worth testing? I also …
Re: The King has left the Building.
Posted on 2024-05-10, 13:06
Could be a kid pretending to be an adult, or somebody a few fries short of a happy meal.
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