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Actually it's still your BIOS

I have sent this problem to someone who is staying touch with the developer of this laptop.

These issues have been eliminated. The eprom (incorrectly written as eeprom) model is M27C256-12F1. Codes 01 to 04 have appeared, but still stopped at 05.

I downloaded the Award BIOS from minusdegreeszero.net and burned it in EEPROM 27C256. However, it didn't display anything, POST code is 05. But I can boot it using the original bios of type 1, what should i check next? Thanks!

RAM,serial port and RTC. The starting address is correct.

I think so. I removed expansion card and use Ruud's Diagnostic, it still showed 576 KB of RAM (actually 256KB on board now). In SuperSoft Diagnostic, 00000~30000 is correct, but addresses 40000,60000,80000 are also considered to have memory. In addition, when switch 3 of SW1 is set to ON, the...

Sorry. It is configuration #2, total 512 KB. 576KB is wrong.

It is 64-256KB board with an expansion card. It showed “Found RAM: 576 KB” in Ruud’s ROM.

Hi everyone. In the past few days, i fixed my 5160 motherboard, it can work normally. However, I turned on it today and it displayed "064 KB OK 0C000 00 201", and cannot use the all 512KB of RAM what I installed. I used SuperSoft and Ruud's ROM, they all say the RAM is OK (may the RAM chips...

Sadly, I can't find the information about the model you said.

I got this expansion card these days,but i did not find any model sign on it. Could someone help me? Thanks very much!

OK. This problem occurs after entering DOS and running for a period of time.

Oh no

Thanks a lot!

According to the things after the board is turned on,I think the 8255 died and unstable causes these problems.

New progress! The board worked after I use the 82’ IBM BIOS and fixed the RAM controlling circuits. But the 8255 maybe died because the keyboard is unavailable (Error code 601) and the board will often be force reset after memory testing. This is a picture of started displays that was not reset...

Nice to meet you! I am new too. I think it is a MDA card because CGA and EGA card always have a RCA jack to transfer composite signals. BTW, what a beautiful sunset! :D

What a pity that this forum cannot upload the full video of testing the board by SuperSoft ROM.

Fortunately, yes. But you said " No error beeps from the Supersoft ROM",actually the board beeped.