Xref: utzoo sci.electronics:17646 comp.sys.ibm.pc.hardware:5384 Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sdd.hp.com!news.cs.indiana.edu!noose.ecn.purdue.edu!mentor.cc.purdue.edu!descartes.math.purdue.edu!wilker From: wilker@descartes.math.purdue.edu (Clarence Wilkerson) Newsgroups: sci.electronics,comp.sys.ibm.pc.hardware Subject: Re: IBM PC Bios ROM upgrade/info 16-64 & 64-256 M-Boards Message-ID: <5623@mentor.cc.purdue.edu> Date: 11 Feb 91 19:59:17 GMT References: <1991Feb11.154445.15362@rodan.acs.syr.edu> Sender: news@mentor.cc.purdue.edu Reply-To: wilker@descartes.math.purdue.edu (Clarence Wilkerson) Followup-To: sci.electronics Lines: 26 I have seen posted ( perhaps on SIMTEL20 ) source for a V20 compatible XT bios. I have used it on one PC clone and it works. Here it is from MSDOS.SYSUTL : wilker@hopf> arc -v bios-asm.arc Name Length Stowage SF Size now Date Time CRC ============ ======== ======== ==== ======== ========= ====== ==== BIOS.ASM 179320 Crunched 66% 62712 18 Jan 88 10:12p 0bfd BIOS.DOC 2471 Crunched 37% 1576 29 Aug 87 3:00p c3c7 ==== ======== ==== ======== Total 2 181791 65% 64288 Here's part of the doc file: From: Ya`akov Miles To: Info-IBMPC at MIT-MC Re: BIOS Musings You may be interested in a history of where this BIOS came from, and how it arrived in its present form. A heavily patched, partially-functionally BIOS (with no copyright statement, or other visible indication of origin) was supplied with my IBM-PC/xt compatible 10 mHz motherboard. In order to get my motherboard to function correctly, in other words, to work with the parity interrupt enabled and to operate with the NEC "V20", it was necessary to disassemble and thoroughly go thru this "anonymous" bios, which was hinted as supplied by Taiwan, while limping along on a name brand bios, as supplied on my previous motherboard by a different vendor.