Path: utzoo!utgpu!water!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!bloom-beacon!husc6!uwvax!dogie!uwmcsd1!marque!uunet!mcvax!unido!tub!tmpmbx!netmbx!hase
From: hase@netmbx.UUCP (Hartmut Semken)
Newsgroups: comp.sys.atari.st
Subject: Re: writing on cartridge port
Message-ID: <1876@netmbx.UUCP>
Date: 1 Jun 88 03:57:31 GMT
References: <3986@mucs.UX.CS.MAN.AC.UK>
Reply-To: hase@netmbx.UUCP (Hartmut Semken)
Organization: netmbx Public Access Unix, Berlin
Lines: 23
Posted: Wed Jun  1 04:57:31 1988

In article <3986@mucs.UX.CS.MAN.AC.UK> paulo@mucs.UX.CS.MAN.AC.UK (Paulo L de Geus) writes:
>A while ago someone posted a description of how a ram-disk using this
>connector works.

There are two possible solutions:
 - hack the hardware (I like this one!).
   If you generate your own DTACK, the Glue will not issue a BUSERR.
BUSERR seems to be the output of a monoflop retriggered by Adress Strobe
(right , Atari?).
Disadvantage: Hmm, if you hack the hardware already, why use the
cartridge port?

 - WRIT by READING. When you read the adress range of the cartridge
port, an Adress is passed to the outside.
Use the low part of the adress (LSByte) to put the data out (to a latch,
latched by Chip Select). Forget the read value.
Works well. 
I took this from a german magazine (c't). They do graet hardware
hacks...
hase
-- 
Hartmut Semken, Lupsteiner Weg 67, 1000 Berlin 37 hase@netmbx.UUCP
I think, you may be right in what I think you're thinking. (Douglas Adams)