10 Dec
2010
10 Dec
'10
11:01 a.m.
It would be very useful to know if this is a
floppy controller error or a
hard idsk cotnroller error.
Yes, I'd like to know that myself! Right. This is
a Sony 400K drive, as in the other Lisa, right? To
eliminate the silly faults, I would at least check the power at the drive
connector, and also see what the various signals are doing.
Good idea. From the I.O board schematics, it appears the floppy
controller and
interface is what I'd expect...
2) Check the
logic signals the floppy drive interface connector. Is there
any activity (changing signals) here? Anything chenge when you put a disk
in?
Nope the drive is dead. And this time even with DD disks! Lights are on
inside it though so it might be getting power. The drive's been
cleaned/relubed and the platter turns. It would be worth me checking out
the signals on the card edge though and comparing them to the working
machine. 4) The floppy coitnroller has its own 6504
microprocessor I believe. Can
you see activity (changing signals) on the address and data bus of this
processor?
I swapped out with a known good one, and it didn't make any difference.