Re: 386 board CMOS problem
Posted on 2024-04-26, 12:16
What is the external battery's power needed for in this case, since the DS1287 has its own battery?
Re: 386 board CMOS problem
Posted on 2024-04-26, 06:08
One thing I just noted is that the DS1287 only works when I have the external 4.5V battery connected. It doesn't work without it and also not with the CR2032 in place of the original 3.6V Varta. I wonder if that tells us something?
Re: 386 board CMOS problem
Posted on 2024-04-25, 15:38
So I should be able to measure the battery voltage on pin 21 when the computer is off?
Re: 386 board CMOS problem
Posted on 2024-04-25, 14:06
As it says DS1287 on the silk screen, just for fun I actually put in a DS1287, and what do you know, it's working! Incidentally, a DS12887 does not work. So that solution works for me, although I'd still be interested in finding out why the original IC doesn't work. I'm assuming that, since the …
Re: 386 board CMOS problem
Posted on 2024-04-24, 06:12
Here's a couple of pictures. One of them is of the place for the RTC before putting the socket in.
Re: 386 board CMOS problem
Posted on 2024-04-23, 11:15
I connected a 4.5V battery pack to the external header. With it, I'm measuring 3.5V at pin 24. It's not giving me any different behaviour though. What's really strange is that when switching the computer on the first time, the system hangs at POST code C0 (which, with AMIBIOS, apparently is …
Re: 386 board CMOS problem
Posted on 2024-04-22, 14:33
I found where I'm losing power: It's right after the first diode. I took the diodes from a spare parts 386 board and put them in place on this mainboard, but it's the same result. I'm getting 3.08V before the diode, 2.9V when lifting the other side out of the circuit. It's going down to 2.7V with …
Re: 386 board CMOS problem
Posted on 2024-04-22, 13:16
I did check it, and the power is indeed too low. With the CR2032 I'm getting 2.5V at the IC. When I connect a 3.6V battery to the external header I'm getting 2.8V at the IC, so still too low. Incidentally, when I measure pin 24 when the computer is switched on, I'm getting 4.3V at pin 24 (I'm …
386 board CMOS problem
Posted on 2024-04-21, 07:02
I have a board with a 386DX 40MHz, whose CMOS chip only remembers the date and time but no other settings (board info: https://theretroweb.com/motherboards/s/j-bond-a340c-h ) The board was badly damaged by battery leakage but I've got it to work again. I replaced the original barrel battery for a …
Re: Monster 3D Voodoo 1 problem
Posted on 2024-04-03, 22:15
I discovered a cracked inductor on the back of the card. Replaced it and it's all working now.
Re: Monster 3D Voodoo 1 problem
Posted on 2024-04-03, 15:59
The cable is plugged in right and I've tried two different monitors. I don't have any other software I could try at the moment.
Monster 3D Voodoo 1 problem
Posted on 2024-04-03, 14:55
I just have a Monster 3D Voodoo 1 card, which I'm trying to get to work with Tomb Raider 1, but when it comes to showing the 3D accelerated picture, I'm only getting a black screen and "no signal" from my monitor. I'm using it with a Matrox Millenium, Pentium 100Mhz, DOS 6.22. I've downloaded the …
Re: i486 serial mouse problem
Posted on 2024-02-08, 08:01
I found the mouse driver for my particular mouse (Genius Mouse One) and used it instead of ctmouse. It's working now. Strange. But ok.
Re: i486 serial mouse problem
Posted on 2024-02-07, 20:39
Well yes I do, in fact I tried two different ones.
i486 serial mouse problem
Posted on 2024-02-07, 16:41
I have a 486 33Mhz on a Biostar MB-1433PA-CH board and I'm having trouble with the mouse under DOS. The board needs an ISA controller card for serial ports (it has no PS/2 ports). The mouse works perfectly under Win3.1 and Win95, but is erratic under all DOS applications such as games. It seems to …
Re: Soyo SY-5TF Socket 7 won't boot
Posted on 2024-01-21, 12:01
The new transistor brought the board back to life. Yay! Thanks for the help!
Re: Matrox Millennium VGA Disabled??
Posted on 2024-01-20, 13:41
Thanks, these are all .HQX files. Do they need to be converted to a binary file?
Re: Matrox Millennium VGA Disabled??
Posted on 2024-01-20, 09:00
Ahhh I ran the progbios utility, but it started flashing the BIOS right away, not even asking for any confirmation. It worked, but I wasn't able to back up the old BIOS. Now I'm sad. Can someone send me the Mac BIOS, please?
Re: Matrox Millennium VGA Disabled??
Posted on 2024-01-19, 20:40
I, too, have a non booting Millennium, presumed to have a MAC BIOS on it. Where can I find the progbios.exe and the BIOS? And what's the command to save the old BIOS?
Re: Soyo SY-5TF Socket 7 won't boot
Posted on 2024-01-15, 14:59
Yes, it was the one on the bigger heatsink. Have ordered D45H11.
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