Suntac 80286 Mainboards

Discussion about old PC hardware.

Re: Suntac 80286 Mainboards

Postby MMaximus » 2018-12-24 @ 10:55

Predator99 wrote:Ups..had an idea where the mistake is. Had to switch the jumper on the Mainboard from 27128 to 27256. Now it reads the whole chip and I can enter Setup:

DSC_7790.JPG


No BIOS at E000...

Also attach the Hi/Lo files of your image for programming.

Phoenix 3.10.22 NSSI.zip


Thanks again!


Sorry I'm not sure I understand your post - does this mean the previous image is working? Or do you still need me to do the debug thing?
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Re: Suntac 80286 Mainboards

Postby Predator99 » 2018-12-24 @ 13:20

No everything OK and working! :-)
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Re: Suntac 80286 Mainboards

Postby MMaximus » 2018-12-24 @ 13:37

Predator99 wrote:No everything OK and working! :-)


OK good to know :)
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Re: Suntac 80286 Mainboards

Postby Predator99 » 2019-1-11 @ 18:27

First a big thanks to MMaximus to send me this very nice (but not working) Suntac board!!! :-)

IMG_0781r.jpg


IMG_0783r.jpg


It is labeled "AMA-1240V1-D".

Bios is the Phoenix 3.10.22 as posted above.

As the board was not booting, I first tried the Supersoft ROMs. I tried 3 different CGAs, but no display. Beep codes are:

6-1 Cannot initialize monitor
6-2 ?
...
6-1 Cannot initialize monitor
3-3 CMOS RAM
...
3-4 Floppy adapter


Everything seems to be OK, except the Monitor...! Had no success in removing all socketed ICs or playing with the Jumpers. Also tried other RAMs.

Then I tried again with the original Phoenix BIOS. Post sequence is:

00
01
02
03
04
05
06
08
09
0d
20
21
22
23
25
27
28
29
2c
2b (Screen memory test failure) / Beep: long short long short
2e
34
35
00
3A
38 (Memory high address line failure at 01000-0A000 (non-fatal) / Beep: short short
00

This indicates an error accessing/adressing the Video memory? Tried several VGAs, same result. To my surprise, the board is up after finishing the POST. I can switch the keyboard LEDs and a reboot with Ctrl-Alt-Del works.

No idea at the moment, no damage visible except some minor battery corrosion. All LEDs on the POST card are OK.

Will continue trying, but any idea is welcome ;-)
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Re: Suntac 80286 Mainboards

Postby Predator99 » 2019-1-26 @ 11:35

Did not manage to fix it so far...

But next one:
286-Suntac-A2125580.jpg


After some cleaning it looks better:
286-Suntac-A2125580--cl.jpg


Seems to be alive, but the delay line in the bottom left is loose, almost all pins broken. Need a replacement...

BIOS:
286-Suntac-A2125580.rar
(1.97 MiB) Downloaded 2 times
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Re: Suntac 80286 Mainboards

Postby root42 » 2019-1-26 @ 13:30

That poor thing… look at the corrosion on the ISA slots!
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