000
19.12.2013, 18:50 Uhr
dk_spb
|
Ich brauche Hilfe die Reparatur EC1834. Sorry für Englisch
---
I have tried to repair system board of 1834. I have made 'test' rom (few mov al,xx and out commands). I have connected LA to ISA slot.
With good system board I can see correct D0-D7 during out command (during -IOW).
With bad system board I can't see correct data during -IOW (FFh instead data).
Did anybody have a scheme of 1834?
Or may be anybody can tell me which IC provide data to data bus during -IOW.
screenshot (lb=A7-A0, hb=A15-A8)
(please check at read line: I have tried write 00h to port 63h,please ignore data group - check D0-D2 instead)
-------------
Dieser Beitrag wurde am 19.12.2013 um 18:53 Uhr von dk_spb editiert. |
