SailorEd
Member
After 25 years in storage, now trying to restore my clone XT. Finally got monitor and keyboard issues resolved and NOW need your help with memory problem. Can not access 384K on extended memory board. When cold booting goes through 256K ram check (on-motherboard) and boots to DOS. "MEM" shows only 256K available. When soft booting; shows error: "I/O CARD PARITY NMI@F000:F9B9". I am at a loss what to do next.
I have removed and replaced 1st bank of chips and first row. Removed and replaced all chips in sockets on board.
When last used years ago, all was working OK. Battery on the board is of course dead.
Not enough memory to run PC tools which is on the harddisk. I do not have 5.25 utility disks.
Motherboard has 256K. Drives consist of HDD and two 5.25 floppy. 384K extended memory board is of unknown manufacturer. Might be Digigraphics.
Both Motherboard and extended card utilize 64K chips; four rows and six rows respectively.
BIOS is Phoneix ver 2.27 Can not get into BIOS. Have tried all common key combinations. Based on name Yangtech, Inc. showing on Boot screen, obvious that builder of unit did there own modifications to the Phoenix BIOS.
Would be most appreciative of advice on how to determine what is problem in accessing the extended memory card. WHAT TO DO?
I have removed and replaced 1st bank of chips and first row. Removed and replaced all chips in sockets on board.
When last used years ago, all was working OK. Battery on the board is of course dead.
Not enough memory to run PC tools which is on the harddisk. I do not have 5.25 utility disks.
Motherboard has 256K. Drives consist of HDD and two 5.25 floppy. 384K extended memory board is of unknown manufacturer. Might be Digigraphics.
Both Motherboard and extended card utilize 64K chips; four rows and six rows respectively.
BIOS is Phoneix ver 2.27 Can not get into BIOS. Have tried all common key combinations. Based on name Yangtech, Inc. showing on Boot screen, obvious that builder of unit did there own modifications to the Phoenix BIOS.
Would be most appreciative of advice on how to determine what is problem in accessing the extended memory card. WHAT TO DO?