Subject: Re: What is a Z80 card?.
From: wilker@math.purdue.edu (Clarence Wilkerson)
Date: Wed, Jul 29, 1998 13«18@ EDT
Message-id: <6pnlgf$ih6@mozo.cc.purdue.edu>

There were two variants of the Z80 card

1) the Microsoft version ( and clones) had a Z80 chip
and very little else. In particular, no DRAM.
It depended on Apple II for
RAM and IO

2) The PCPI was logically a Z80 single board computer
with it's own RAM and ROM. It used a simple protocol
to communicate its io needs to a driver on the Apple II side.

-- 
Clarence Wilkerson      \ HomePage:     http://www.math.purdue.edu/~wilker 
Prof. of Math.           \ Internet:    wilker@NOspam.math.purdue.edu
Dept. of Mathematics      \ Messages:   (765) 494-1903, FAX 494-0548
Purdue University,         \ 
W. Lafayette, IN 47907-1395 \            
