This article is from the alt.comp.hardware.homebuilt Frequently Asked Questions. It is maintained by Mark Sokos (msokos1@gl.umbc.edu) with many contributions from others.
Annabooks sell a 'bioskit' that is a complete BIOS, written mostly in C, with source. http://www.annabooks.com
Assembler source for a V20 BIOS has been published by c't magazine (http://www01.ix.de). The disk with the code and the burnt EPROM is still for sale.
 
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