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From: george@wombat.bungi.COM (George Scolaro)
Newsgroups: comp.sys.nsc.32k
Subject: Re: my pc532 is almost up.
Message-ID: <9008202221.AA12199@wombat.bungi.COM>
Date: 21 Aug 90 05:21:07 GMT
Sender: news@daver.bungi.com
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Approved: news@daver.bungi.com

[In the message entitled "my pc532 is almost up." on Aug 20, 15:26, Jon Buller writes:]
> 
> Could some of you out there give me some hints as to what I am doing
> wrong when I try to bring up my board?  I can not see any activity on
> the ras, cas, or other dram signals, but there are some pulses on bank0.

At the very least refresh should be happening (if the monitor is coming up
at all). The pc532 uses CAS before RAS refresh, and hits both banks at the
same time. So, if not RAS and CAS, check the refresh clock coming from the
ICU (RFRQ, software programmed to give a 30usec square wave) if none then
back track some more. If you have refresh out of the ICU, check it after it
has been synchronised at the input of the DRAM pal, if it isn't there then
the synchroniser is dead. If it doesn't come out of the ICU then the monitor
is not coming up at all, which means there is a problem getting data out of
the EPROM to the 532. Also check that reset is there, ie make sure that it
is available at RSTo and /RSTOUS from U42 (the schmitt) and from /RSTO from
U50 (the synchroniser).

> Also there are 200nS pulses about .5uS apart on slow, eprom, and the like.
> Is this normal?  (I would expect some dram activity for stack...)  I also
> do not see any activity on duart0 (or the others either.), and I have a
> PC com port hooked up to con3 on the board.  I do not see any activity on

CON3 is the correct port for the monitor to sign on, but if you don't have
RAS/CAS refresh then it's unlikely for the monitor to be running.

> board up?  Thanks for your help, and maybe VERY SOON (I can feel it...)
> I will have a working board.

Hope so, keep us advised of your progress. Do you have a copy of the debug
document that John Connin and I put together. Does everyone else have a
copy (electronic, it didn't exist when the kits went out)? Does anyone else
need it?

Best regards,

-- 
George Scolaro
george@wombat.bungi.com                [37 20 51 N / 122 03 07 W]