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From: binder@asd.dec.com (NOW willya gimme some fightin' room?)
Newsgroups: comp.sys.apple
Subject: How does the PCPI Applicard manipulate the Apple itself?
Message-ID: <6453@decwrl.DEC.COM>
Date: Tue, 18-Nov-86 09:15:05 EST
Article-I.D.: decwrl.6453
Posted: Tue Nov 18 09:15:05 1986
Date-Received: Tue, 18-Nov-86 21:36:06 EST
Sender: daemon@decwrl.DEC.COM
Organization: Digital Equipment Corporation
Lines: 21

The very scanty technical information included with my MicroPro StarCard 
(aka a PCPI Applicard) says that the Z80 and 6502 communicate through a port
on the Applicard.  But there's not a clue as to how that port is managed. 

I'd like to write an assembly-language program for the Applicard, but I 
can't, without that technical info.  How does the Z80 read and write Apple
memory?  Does the port consist of an address register and a read/write data
register?  What are the addresses of any registers associated with the port?  
Better yet, does anyone have a line on some official PCPI documentation that 
will explain the card's architecture?  Information on how the CP/M drivers
are written to live in the native Apple would also be useful. 

Please reply directly by Email, because I'm not currently receiving 
comp.sys.apple.

Thanks,
Dick Binder   (The Stainless Steel Rat)

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