Path: utzoo!utgpu!watserv1!watmath!att!linac!pacific.mps.ohio-state.edu!zaphod.mps.ohio-state.edu!rpi!julius.cs.uiuc.edu!apple!motcsd!lance
From: lance@motcsd.csd.mot.com (lance.norskog)
Newsgroups: comp.graphics
Subject: Re: Can a 34010 emulate a 8514/A?
Message-ID: <2232@greek.csd.mot.com>
Date: 29 Nov 90 19:33:24 GMT
References: <1990Nov25.173919.4313@wubios.wustl.edu> <1990Nov26.203552.18302@santra.uucp> <6468@gssc.UUCP> <1990Nov29.132641.11209@santra.uucp>
Organization: Motorola CSD, Cupertino CA
Lines: 13

IBM never documented the 8514/A register set (I think).

They have, however, released their sources to the 8514/A-based X Window Server.
Sooooo, you can read it and figure it out.  Also, several manufacturers
have reverse-engineered the chip spec, built their own chips, and publish
chip books which contain the 8514/A register set.

Any processor could emulate the 8514/A register set by capturing
register accesses, holding the bus, and then feeding a value to
the 80x86.  It would be hokey, but actually fairly easy to implement,
if the 8086 bus spec allows playing with timing in this fashion.

Lance