Article View: comp.sys.atari.st
Article #39002Re: cartridge port addressing
From: Dave Newton
Date: Tue, 23 May 1989 19:01
Date: Tue, 23 May 1989 19:01
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1986 bytes
A lot of people (including myself) have wanted ATARI to put expansion
slots on their machine. What I am considering is this: get a whole big
bunch of people to come up with a standard interface, publish it, and get
hardware for it.
What I need to know is this: A bus error (illegal address) is generated
when writing to the cartridge port. Is this error hardware or software
generated? If it's software generated, we can re-code the ROMS to get around
it, bring out a WRITE line, and stick an expansion box onto the cartridge
port. If it's hardware generated, we'll need to come up with a relatively
easy hardware hack to get all the signals out.
What I would propose in this latter case is this: the hardware hack would
consist of unsoldering (? or is it socketed?) the 68000 MPU, inserting a
socket with a ribbon cable, then sticking the 68000 back in. The cable would
lead to a box with a buffering system on it and a bunch of expansion slots.
All signals necessary for healthy ST operation would be there.
On a mega ST this would be easier, since there's already a port--the 520/
1040's would need more work.
Anyone interested? I think it's necessary for ST survival. The reason
the Amiga is growing faster is because of this feature alone--the desktop
looks awful. Expandability/versatility is needed desparately on this
machine.
--
"If I cannot create it, I do not understand it"
-Richard Feynman
David L. Newton (414) 524-7465 dnewton@carroll1.cc.edu
=8-) (smiley w/ a mohawk) (414) 524-7343 uunet!marque!carroll1!dnewton
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!csd4.milw.wisc.edu!marque!carroll1!dnewton From: dnewton@carroll1.UUCP (Dave Newton) Newsgroups: comp.sys.atari.st Subject: Re: cartridge port addressing Message-ID: <419@carroll1.UUCP> Date: 23 May 89 19:01:51 GMT Organization: Carroll College-Waukesha, WI Lines: 29