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Technology Stocks : Rambus (RMBS) - Eagle or Penguin
RMBS 92.53+5.0%12:54 PM EST

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To: Dave B who wrote (25364)7/20/1999 5:02:00 PM
From: John Walliker  Read Replies (2) of 93625
 
Dave,

Actually, ISA was the first PC bus. There was first an 8-bit version, then a 16-bit version followed.

I still have the IBM PC/AT Technical Reference on my bookshelf (and the PC/XT one somewhere). It has complete circuit diagrams of the PC and a full assembler listing of the BIOS. This level of detail was invaluable when designing interface cards, because there was little else available. However, there were no timing diagrams, which led to a degree of interpretation and hence sometimes unreliable designs.

IBM tried to stop the clone manufacturers and if I remember correctly even wanted retrospective royalties in relation to "ISA" bus designs before they would grant Microchannel licences.

The situation does not seem to be comparable.

John
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