Thanks Ruud, and great news on the 8088 board too. Does it look like
something folks would be able to duplicate? Are there any really
hard-to-find chips on there?
- Bo
> -----Original Message-----
> From: owner-cbm-hackers@cling.gu.se
> [mailto:owner-cbm-hackers@cling.gu.se]On Behalf Of ruud.baltissen@abp.nl
> Sent: Monday, February 25, 2002 2:31 AM
> To: cbm-hackers@cling.gu.se
> Subject: RE: C128 repair advice...
>
>
> Hallo Bo,
>
> I can give some other advices. By tying the WAIT-input to GND you stop the
> Z80. AFAIK the Z80 immediatly starts at address $0000 after a
> reset. As the
> Z80 doesn't do anything at all now, you can use a digital
> Voltmeter to check
> the state of various address- and controllines. Including those
> of a buffer
> as Richard suggested.
>
> A step further is disabling the Z80 by pulling BUSRQ Low. Now you can feed
> the address- and other lines with your own signals and see if the PLA, MMU
> and other ICs work as they should do.
>
>
> FYI: the 8088 board has been "schematiced" for about 75%.
> ___
> / __|__
> / / |_/ Groetjes, Ruud
> \ \__|_\
> \___| http://Ruud.C64.org
>
>
>
> Message was sent through the cbm-hackers mailing list
Message was sent through the cbm-hackers mailing list
Archive generated by hypermail 2.1.1.