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 Radio: N7IKQ 'home': P.O.B. 461 \ Lafayette, CO 80026