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From: tech@usceast.UUCP
Newsgroups: comp.sys.atari.st
Subject: Re: plugboards for the cartridge port
Message-ID: <2346@usceast.UUCP>
Date: Mon, 9-Mar-87 09:51:58 EST
Article-I.D.: usceast.2346
Posted: Mon Mar  9 09:51:58 1987
Date-Received: Tue, 10-Mar-87 04:21:01 EST
References: <788@sdcc12.ucsd.EDU> <2812@mit-hermes.AI.MIT.EDU> <367@batcomputer.tn.cornell.edu>
Reply-To: tech@usceast.UUCP (Bill Wood)
Organization: Csci Dept, U of S. Carolina, Columbia
Lines: 17

In article <367@batcomputer.tn.cornell.edu> braner@batcomputer.UUCP (braner) writes:
>
>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.)

	Have you decided if you are going to post the math interface to
the net? I think it most interesting. I would like to follow up on this
for some image processing software that could use the resolution and
support. 

			Bill Wood(!usceast!tech)