Article View: comp.sys.atari.st
Article #25482Re: plugboards for the cartridge port
From: braner
Date: Sun, 08 Mar 1987 05:39
Date: Sun, 08 Mar 1987 05:39
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[] 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.)
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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: arc1-ca.pugleaf.net!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.