Date: Monday, 15 April 1985
From: ir320%sdcc6 at SDCSVAX.ARPA
Re:   New file PCPI.MAC

Just because I ask for pcpi code so much I thought it would be nice to
send this out.  I have written a small piece of code for any computer
to use the pcpi card to read/write a byte of apple memory.

Doc: 

Parms should be placed on stack in reverse order:
Peek mem: <addr> [2 bytes] : Address of memory to peek
Poke mem: <addr> <data> [2 bytes Ignore hi in data] : Poke <addr> with <data>
Call <routine addr>+2 to peek mem
Call <routine addr> to poke mem.

Turbo pascal code (if pcpi.mac resides at $1d76 for example):

Procedure Poke(addr, data:integer); external  $1d78;
Function Peek(addr: integer): integer; external $1d76;

PCPI.MAC is the module for PCPI work.  It is for use in Turbo pascal.
That's all there is to it.