Re: [miroCRYSTAL 20SD VLB] Looking for VGA BIOS dumps
Posted on 2021-11-28, 21:01
Thanks! I'll be sure to test the BIOS when I get my EEPROM chip in the mail.
Re: Building a 486 DX-4: the Compatibility Machine
Posted on 2021-11-28, 11:34
Here's a good tip for compatibility with old DOS games: Clock the CPU down to like 16-25MHz, and disable L2 cache.
Re: Building a 486 DX-4: the Compatibility Machine
Posted on 2021-11-28, 11:09
Nice system, though remember that AMD DX4-100 only has 8kB L1 cache vs. 16kB on the Intel DX4-100. That mobo text just sounds like an AMD advertisement to me (probably referring to the AMD P75 133MHz CPU). Also, using an ISA graphics card in a late 486 system should've been illegal! Wouldn't it be …
Re: [486DX2-66 VLB] No POST if S3 Vision864 VLB + VLB Multi-I/O controller cards are connected
Posted on 2021-11-26, 14:50
Try setting your bus speed to 25MHz and see if you get a POST with both cards at that speed. That could help troubleshoot the issue. I set FSB to 25MHz, still no post. Another interesting fact is that if I connect another VLB GPU while the S3 Vision864 is connected, the system posts, so it really …
Re: [486DX2-66 VLB] No POST if S3 Vision864 VLB + VLB Multi-I/O controller cards are connected
Posted on 2021-11-25, 20:38
There's a setting for VLB waitstates, and a setting for FSB (not for setting the FSB, but a jumper that needs to be set accordingly). My FSB is 33MHz, and waitstates is set to 0, and the Mhz thing is set to <=33. I have tried all possible combination on it, and it didn't help. However, I have not …
Re: [486DX2-66 VLB] No POST if S3 Vision864 VLB + VLB Multi-I/O controller cards are connected
Posted on 2021-11-25, 16:10
No way, I already spent way too much money on this. It should be a solid performer once I get the system up and running.
Re: [486DX2-66 VLB] No POST if S3 Vision864 VLB + VLB Multi-I/O controller cards are connected
Posted on 2021-11-25, 14:15
I only use MS-DOS and Windows 3.11 without any VLB IDE driver, so yeah, this is a solution too. However, I want to try a different VGA BIOS first.
Re: [486DX2-66 VLB] No POST if S3 Vision864 VLB + VLB Multi-I/O controller cards are connected
Posted on 2021-11-25, 13:20
Did you try in different slots (swap I/O card with 20SD)? Yes I did, I forgot to mention this in the post. EDIT: One thing I'm going to try is another Vision864 VGA BIOS. The one on the card is a very old version (v1.00-04). I just have to wait for a W27E257-12 chip to arrive, and that takes time. …
[486DX2-66 VLB] No POST if S3 Vision864 VLB + VLB Multi-I/O controller cards are connected
Posted on 2021-11-25, 13:17
I just got a miroCRYSTAL 20SD (S3 Vision864 2MB , old card revision), and I found out that my system won't POST if my VLB Multi-I/O card (PTI-255W v1.2, Winbond chipset) is also connected. With an older S3 805 GPU, I have no issues whatsoever. Any idea what could cause this? I've tried different RAM …
Re: "Parity Error" when using DX4 CPU on 486 mobo
Posted on 2021-11-17, 10:18
I have a mysterious problem with my UC4913 ver2.0 486 motherboard when using a DX4 (it's fine with DX2)... Maybe there is an opportunity to take a bios dump? I only found 1.0, although I know there is 1.4, but it is not read correctly and does not work (on win3x.org) I don't have this motherboard …
Re: [miroCRYSTAL 20SD VLB] Looking for VGA BIOS dumps
Posted on 2021-11-13, 12:32
Ok, not sure if the BIOS is compatible with the AT&T RAMDAC version. Btw, my card really is a miroCRYSTAL 20SD, it's just a different (and probably cheaper) revision, I think.
Re: [miroCRYSTAL 20SD VLB] Looking for VGA BIOS dumps
Posted on 2021-11-13, 09:47
I don't know yet, I'm still waiting for it to arrive in the mail. I attached a picture of the exact card. It has an AT&T RAMDAC, do you have one of those?
[miroCRYSTAL 20SD VLB] Looking for VGA BIOS dumps
Posted on 2021-11-09, 11:08
If you've got a miroCRYSTAL 20SD VLB (Vision864) card, I'd be very interested in a dump of its VGA BIOS. I just want to see if I can find different versions of the BIOS to try out. 😀 Here's the exact card. It seems to be an early miroCRYSTAL 20SD revision.
Re: Fasttracker 2.10 & 2.11 for MS-DOS
Posted on 2021-08-29, 17:03
No one knows.
Re: Fasttracker 2.10 & 2.11 for MS-DOS
Posted on 2021-08-29, 09:44
It is simply wonderful to see continued development on FT2. Yet distressing to see that this code base still remains closed source. This community who have grown up with this amazing program, would benefit so much if this code would only be made public and tracked in a proper repository for version …
Re: Fasttracker 2.10 & 2.11 for MS-DOS
Posted on 2021-07-29, 09:21
There's technically a tick delay in original FT2 when using Sound Blaster, but I'm not sure how high it is. Gravis Ultrasound mode though, should give extremely low tick delay (probably <1ms). Now that sounds fine, but when it comes to the FT2 clone, it has too high delay (~21.3ms on the default …
Re: Fasttracker 2.10 & 2.11 for MS-DOS
Posted on 2021-07-10, 20:00
I haven't heard from traffkin in a long time, I assume he either doesn't have time, or gave up on it... I think he had other plans than just MPU401 support too, which could've made it more difficult to achieve what he wanted.
Re: [STB Powergraph VL-24] RGB contrast fix + DOS performance boost
Posted on 2021-05-12, 19:42
Sounds like a short to me. Try to measure the resistance between 12v and ground, and 5v and ground, on the PSU connectors (going to the mobo).
Re: [STB Powergraph VL-24] RGB contrast fix + DOS performance boost
Posted on 2021-05-10, 20:43
That's a neat idea. Could in theory add a toggle-switch in the back, which could be toggled when the computer is off. Not sure if I could be bothered though, I don't need >16 colors, >640x480 and hardware acceleration in Windows 3.1x, as I rarely boot that on the computer.
Re: [STB Powergraph VL-24] RGB contrast fix + DOS performance boost
Posted on 2021-05-10, 20:18
Sweet, I bought one of these cards recently and will definitely try this out. Thanks for finding this and sharing. Remember to make a backup of your current VGA BIOS first. Also let me know if you have the same overexposed RGB signals as I did (probably only on TFTs). The way you can tell is to …
Page 1 of 7