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XT Extended Memory Access Problem; Parity

XT Legacy Machine Memory NMI Memory Chip Physical Location

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#1
SailorEd

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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.

 

Thanks again.

Ed


Edited by SailorEd, 28 February 2015 - 03:38 PM.

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#2
SpywareDr

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AFAIR, way back in the days of the 8088 there was no BIOS Setup to get into. You had to manually fiddle with jumpers and/or switches on the motherboard, (and expansion cards). IU don't believe it was until the 80286 before any systems had BIOS settings that could be accessed with the correct manufacturer's Setup diskette. It may have been later though with the 80386.


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#3
SailorEd

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AFAIR, way back in the days of the 8088 there was no BIOS Setup to get into. You had to manually fiddle with jumpers and/or switches on the motherboard, (and expansion cards). IU don't believe it was until the 80286 before any systems had BIOS settings that could be accessed with the correct manufacturer's Setup diskette. It may have been later though with the 80386.

Thank you for the comment.  At least that is one less thing for me to worry about not understanding.  Regards  Ed


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Also tagged with one or more of these keywords: XT Legacy Machine, Memory, NMI, Memory Chip Physical Location

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