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From: davel@hpvcla.HP.COM (David Lowe)
Newsgroups: comp.sys.atari.st
Subject: Re: Writes to ST Cartridge Ports?
Message-ID: <4730014@hpvcla.HP.COM>
Date: Tue, 30-Jun-87 13:55:47 EDT
Article-I.D.: hpvcla.4730014
Posted: Tue Jun 30 13:55:47 1987
Date-Received: Fri, 3-Jul-87 04:40:30 EDT
References: <8706292047.AA13208@ucbvax.Berkeley.EDU>
Organization: Hewlett Packard, Vancouver, WA
Lines: 18

>I am posting this for a friend who wants to tie into the cartridge slot
>of a 512 ST. He is attempting to interface to a video digitizer (from
>BYTE magazine - one of Steve Ciarcia's projects). Does anyone have
>information on what needs to be done in hardware and software to
>accomplish this?

Steve Ciarcia's video digitizer/transmitter aritcles were in two issues
of Byte. One of those issues also carried a hardware project for the ST.
That ST article describes in detail a way to write to the cartridge port.
Also included is a description of why running the R/W line out to the
port won't work. (The project was a real time clock for the ST.)

Speaking of real time clocks; is it feasible to provide battery backup
to the keyboard controller? Thereby keeping it's clock running. Does 
GEMDOS set it's clock from the kyboard clock at Power-On/Reset?

Dave Lowe
hp-pcd!hpvcla!davel