ok, now the RAM test starts but gives a bad ram sound on RAM/BIT 6. most of RAMs have been replaced, 5, 6 and 7 included
if I remove RAM 7 then RAM 6 has a low tone (as it was good) and the high tone is on RAM 7
Replacing one of both RAMs haven't any effect.
I replaced:
ADDRESSES
A2, B2, C2 that have in input the AB0..9 signals from the CPU having ADR0..9 as output
H2, J2, K2 that have in input AB0..9 having A0..9 as output
DATA
E3, E4 with input D0..7 and output DBUS0..7
H5, J5 that make a NOT on DOUT
F5, K5 that in some way are connected to DOUT6 / D6
Any idea?
Do you have any experience about wrong RAM error? I mean: beep says RAM x is faulty but actually RAM y is.
This board is not mine but owns to the inventor of OFF LIMITS
When I visited hos warehouse some weeks ago he asked me this favor promising me to spend some time to look for old documents and stuff