Apple II Computer Info
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### FILE : parallel2ibm
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### Created : Saturday, February 22, 1997 Modified: Saturday, February 22, 1997
### File Type: "TEXT" File Creator: "LMAN"
### File Size: 5332 bytes 5 KB
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Newsgroups: comp.sys.apple2,comp.sys.apple2.programmer
Subject: Messing around with a parallel i/o card
Date: 22 Feb 1997 06:11:39 GMT
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I've been having some fun with a home brew parallel i/o card for
Apple2. It's a modified parallel printer card with a flat cable that
plugs into an IBM-PC parallel port allowing the two computers to
exchange data directly.
Using Borland C I wrote some preliminary software for the IBM to
configure it as a file server for ProDos 8 but just as easily it
could directly download programs, operating systems such as DOS 3.3,
etc.
So far I've been using a MacroprintPlus card (by Macrotech Computer
Products of BC, Canada) as it was designed for parallel i/o as well
as printing.
However, the Grappler+ is much more widely available, especially the
clone versions. Some time ago I posted instructions on how to modify
a Grappler for this function and I've thought up an extension of the
concept to make it more versatile by allowing the on-board firmware
to be writable at run time. This is particularly handy for me because
I use a 6502 cross-assembler on the IBM.
Basically the idea involves using both RAM and EPROM. The operating
system, program and firmware would all be downloadable from the IBM
which has much more storage resources than the usual II+ or //e
system with 143k floppy drives. The ROM would contain only minimal
boot code, used to download whatever firmware is needed at the
moment.
It would be handy if the RAM were non-volatile, and Dallas
Semiconductor makes a battery-backed 2k x 8 RAM, the DS1220.
Modifying the Grappler+
-----------------------
This card has the following hardware features:
Apple II Computer Technical Information : Apple II Family Hardware Info
ftp://ground.ecn.uiowa.edu/2/apple2/miscinfo/hardware : May 2001 : 334 of 572
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