Path: utzoo!utgpu!watmath!clyde!att!rutgers!mcnc!xanth!ames!amdahl!uunet!cadnetix.COM!cadnetix!rusty
From: rusty@cadnetix.COM (Rusty)
Newsgroups: comp.os.cpm
Subject: Re: Jade S-100 Big-Z board
Summary: here is a fix, hope its the right one
Message-ID: <5534@cadnetix.COM>
Date: 2 Dec 88 01:34:31 GMT
References: <8811252334.AA04944@emx.utexas.edu>
Sender: news@cadnetix.COM
Reply-To: rusty@cadnetix.COM (Rusty)
Distribution: na
Organization: Cadnetix Corp.,  Boulder, CO
Lines: 34

In article <8811252334.AA04944@emx.utexas.edu> mknox@EMX.UTEXAS.EDU (Margaret H. Knox) writes:
>
...
>  That glitch (pwrite, or some such) gives me trouble
>with most other non-Jade boards I've tried....
>Can I send you a SASE perhaps?
>
>				tnx,  mknox
well, first, here is a possible fix (from the manual):
"Symptoms: The CPU card fails to operate with some dynamic memory
cards at 4 MHz, and operates erratically with some disk controller cards
at all operating clock rates."

"Cause: 

"Cure: remove IC U40 and install a 16-pin dip header with jumpers installed
between pins 2/16, 3/15, 6/10, 7/9.  This removes the latch and does not
introduce a pSYNCh delay for these signals"

BTW, you GOTTA do this if you have an SD systems Expandoram II or the
Jade DD disk controller (neat, huh? *THEIR* cards don't even work together!).

There is also a fix for erratic reset (use a different cap value for C22),
and for any problems with the serial port at 4 MHz (get a better 8251).



-----
Rusty Carruth   UUCP: {uunet,boulder}!cadnetix!rusty  DOMAIN: rusty@cadnetix.com
Cadnetix Corp.  (303) 444-8075x681 \  5775 Flatiron Pkwy. \ Boulder, Co 80301
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