Hallo allemaal, > Even more frustrating: I thought about using a commented source of > the BIOS of the IBM PC and one of a clone.... I just found out that something went wrong with naming and placing some files 14 years ago. I was sure I missed something in the IBM source so I checked a PDF of the reference manual of the PC-XT. That gave me a keyword, "diskete_io" in this case, and searching for this string in all my ASM files gave me the correct source file. This source is quite clear what is done when handling a FD. Just take in mind that a PC uses DMA to transfer data so a) this "polutes" the source quite a bit and b) things can differ for the non-DMA mode. If someone is interested in this file, email me and I will upload it to my site. FYI: this was my very first commented disassembly somewhere in 1985 or 1986 using the original comment of IBM from this manual. I used it as base to create my own BIOS so I could diagnose faulty boards. Saved and earned my company quite some money in those days. For the ATs and better we bought a tool called Logimer. -- Kind regards / Met vriendelijke groet, Ruud Baltissen www.Baltissen.org --- Dit e-mailbericht is gecontroleerd op virussen met Avast antivirussoftware. https://www.avast.com/antivirusReceived on 2018-11-19 23:00:07
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