Re: IBM PS/2 Model 70 won't keep configuration, help?
Posted on 2022-01-18, 13:18
Hi, You are right, I have to do some more testing.... 😀
Re: IBM PS/2 Model 70 won't keep configuration, help?
Posted on 2022-01-13, 12:50
Hi, I have done some probling on the board, and this is what I found out. On pin 18 on the SRAM IC it get 3,8 volt, when the machine is turned off. And when it is turned on I get 0,012 volt. The VCC voltage on the SRAM IC is only 3,66 volt - that seems to be to low, it should be 5 volt I have pulled …
Re: IBM PS/2 Model 70 won't keep configuration, help?
Posted on 2022-01-02, 16:36
HI, I will try it after new year 😀 , and I will give you an update Cheers, Carsten
Re: IBM PS/2 Model 70 won't keep configuration, help?
Posted on 2021-12-30, 10:27
Hi Silvervest, Great Job :-) I have got the excatly the same problem on my model 80-111 !! It is the same problem as you have described in your first post. I have been looking at the schematics for the model 80 , and found the Hex inverter ( U185C ) and it is connected to pin 18 on the SRAM. I do …
Re: Unknown motherboard
Posted on 2021-10-18, 08:36
Perfect 😀)
Re: Unknown motherboard
Posted on 2021-10-17, 09:00
Thanks 😀 I have seen it, but something caught my eye.....it says it supports 386 Cpu´s... Regards Carsten
Re: Unknown motherboard
Posted on 2021-10-09, 06:55
😀, nice to have an eprom reader. You are welcome, glad that I could be able to assist you. Regards Carsten
Re: Unknown motherboard
Posted on 2021-10-08, 08:44
yes 7 16bit ISA slots 😀 I have unpacked the zipfile to a floppy, but the ATROM.EXE is not there, so I used the ROMSAVAT.exe instead - It has generated a file called ATROM, I have uploaded it as a zipfile - hope it can help you 😀 Thanks for the help. Regards Carsten
Re: Unknown motherboard
Posted on 2021-10-07, 14:02
Hi Deksor, Thanks for the help, It is alive :-) :-) I got a bit confused over the post codes, because it looks like the board was working !!. I changed the ram sticks to 1MB 3 chip, I had to try some different ones, before i could get it to work...the board is pretty senitive about the ram I still …
Re: Unknown motherboard
Posted on 2021-10-07, 07:27
HI, Thanks for your help :-) I have allready tried with 4 sticks of ram :-), I just took the picture before i had put all the ram sticks in - my fault, sorry. I will try with some other ram sticks. I have got some 3 Chip 1MB that i know is working in another machine. If it does not work, I will …
Unknown motherboard
Posted on 2021-10-06, 19:05
Hi, I have got this motherboard from an old machine, but i can´t find anything about it. On the board it says 486DXA REV 1.0 Perhaps somebody have seen it before ?. I have tried to power it up, but I don´t get any picture on the screen and i get Continuous Beeps. When the board powers up, there is …
Re: Help for Motherboard id
Posted on 2021-03-19, 09:43
Ok, Thanks We will try with a multimeter first. Regards Carsten
Re: Help for Motherboard id
Posted on 2021-03-18, 18:56
I will get some help from my brother, he has got an oscilloscope. Thanks for the hint. Regards Carsten
Re: Help for Motherboard id
Posted on 2021-03-16, 19:17
Yes, could be that. But still no manual for the jumpers, so it is going to be tough... I will put it on the shelf for now, maybe someone will be able to find the jumper settings at some time. /Carsten
Re: Unknown video / capture card
Posted on 2021-03-05, 09:00
Thanks for the info. /Carsten
Re: Unknown video / capture card
Posted on 2021-03-04, 10:04
On the "large" chip it says "BT451K0125 Ramdac"
Unknown video / capture card
Posted on 2021-03-04, 10:02
Hi, I have found this card, but i have not been able to find anything about it. On the back of the card it says " Videograph" Perhaps some of you have seen such card before ?. Regards Carsten
Re: Help for Motherboard id
Posted on 2021-03-04, 09:56
i have tried with a new bios chip, that was flashed with the bios image from a MSI-4134 board. But still no bios codes on the PC analyzer card.....perhaps the board is dead ?
Re: Help for Motherboard id
Posted on 2021-02-19, 08:16
Hi, The bios chip is a mx 27c1000dc-12, I will try to find another bios chip ( empty ), and get it programmet with the bios image from the MS-4134 board.
Re: Help for Motherboard id
Posted on 2021-02-17, 16:29
Hi, Have have used a 1mb module, and i have placed it in each of the 30-pin sockets. I havealso tried a 4mb module in each of the 72 pin sockets. Thanks for the long shot, you are just great :-)... it turns out that the bios chip was turned the wrong way around :-(. I did not see that when i got the …
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