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Path: utzoo!mnetor!seismo!rochester!cornell!batcomputer!braner
From: braner@batcomputer.tn.cornell.edu (braner)
Newsgroups: comp.sys.atari.st
Subject: Re: plugboards for the cartridge port
Message-ID: <367@batcomputer.tn.cornell.edu>
Date: Sun, 8-Mar-87 00:39:45 EST
Article-I.D.: batcompu.367
Posted: Sun Mar  8 00:39:45 1987
Date-Received: Mon, 9-Mar-87 19:43:41 EST
References: <788@sdcc12.ucsd.EDU> <2812@mit-hermes.AI.MIT.EDU>
Reply-To: braner@batcomputer.UUCP (braner)
Organization: Theory Center, Cornell University, Ithaca NY
Lines: 17
Summary: Still hard to find, and not exactly 2mm.

[]

I had to etch my own connector for the cartridge port.  I still
don't know of a commercially available card, besides some rather
expensive cards designed for EPROMs (rather than prototyping).
And by the way: the pitch is NOT exactly 2mm!

- Moshe Braner

PS: My proposed cartridge port mod was to cut pins 1, 39 and 40 (they
are redundant gnd and 5V lines), and connect pin 1 to the CPU R/W line,
pin 40 to the CPU clock, and pin 1 to a decoded address strobe generated
by a chip mounted inside the ST that passes the CPU AS line but only
when the address is in the 3-plus-epsilon-megabytes range.  This arrangement
lets me do full-speed writing to the port, while maintaining the port's
utility for standard plug-ins (once you cut those pins inside the plug-in!).
(I use the port for a homemade floating-point device with a 32081 chip.)