Hi everyone,
Here is an update of the checking I've today.
The LCDC HD61030 is held unselected since its /CS pin (labeled /LCD on the
schematics) is high all the time.
I guess that's why the LCD is black all the time.
If I've read well the schematics, this signal /LCD comes from the SLA5080FOU
gate array and is the logic result
of the combination of signals ALE, /RESET and IO/M and AD04-AD7.
On the CPU, there is a brief activity on AD6 and AD7 and then, they stay
high all the time.
As for IO/M pin on the CPU, it is high when reset is active but then seems
to stay low all the time afterward.
So, it seems the CPU never tries to access I/O and thus /LCD signal cannot
go low and activate the LCDC chip.
Just to be sure, can someone confirm the chips on sockets M13, M14 and M15
please ?
Here's what I have:
- M13 = 364E43-6A3 also written 10002
- M14 = 3256S27-6H1 also written 10003
- M15 = 3256S97-6H3 also written 10001
All 3 chips have "MICROSOFT" written on them.
Thanks in advance for your help !
Gilles
