From: utzoo!decvax!harpo!seismo!hao!hplabs!hp-pcd!orstcs!tretheweyj
Newsgroups: net.games.video
Title: Re: coleco
Article-I.D.: orstcs.183
Posted: Mon Jan 10 21:14:41 1983
Received: Thu Jan 13 05:11:03 1983

   My boss at the OSU Computer Center recently bought a ColecoVision, and
out of curiosity, looked inside.  There was a Z-80 in there.  Of course,
there are many readily available sources of instruction set documentation.
I/O is performed using ports (PIO, PPI, USART, whatever) or other appropriate
TTL.  It may be possible to tell where I/O "goes to/comes from" just by
looking at the board and the chip numbers (buy a TTL handbook).  If that
is not possible, you may have to resort to pulling PROM's out of sockets,
reading them elsewhere and disassembling the machine code.  I am sure you
will violate any warranty by doing this.
   (If I have made any blatant errors, flames to:)

                  Jim Trethewey, Oregon State University, Corvallis.