Really would appreciate help from someone that appreciates challenges from years ago.
I have been trying to get my old 8088 XT going again. After getting monitor and keyboard issues addressed, I have ran into memory issue.
I have 256K on mainboard with Phoenix BIOS 2.27. ( I can not get into BIOS, have tried everything I can think of but can not get into setup for BIOS.) Have 384K Multifunction memory card with clock, battery, Parellel and game ports. All was working 20 years ago when it was put into storage.
When booting, only the 256K on the mainboard is accessed. When doing a softboot (Cntrl,Alt, Del), it shows "I/O Card Parity NMI @F000:F9B9. I expect this is the problem why the expansion card memory is not being accessed.
Where on the expansion board is this location? I can then change the chip. It has 6 rows of 9 memory chips.
Most grateful for help in identifying what chip is bad on the expansion card.
Would also be wonderful to get your ideas on how to determine how to get into BIOS set-up. Is it possible to dump BIOS and see how to get into it. Given the name of Yangtech Inc. that shows on the monitor after booting, it is obvious that they got into the BIOS and made some changes other than the Phoenix code.
Edited by SailorEd, 28 February 2015 - 03:38 PM.