NSC 8477 Was: New takes on XT-IDE, a new FDC, and a new CM/S GAL

Ali cctalk at ibm51xx.net
Wed Dec 19 19:38:53 CST 2018

> Micro Solutions initially shipped the CompatiCard IV with the Intel
> chip--and it worked well.  Intel then revised the chip as the 82077AA-1
> to add tape support and broke the FM capability.  When I inquired about
> this to Intel, I got the response "Who uses FM anymore?".   Micro
> Solutions sent a bunch of retrofit kits with NSC chips in them to a
> small bunch of CC IV purchasers after they discovered the problem.
> Fortunately, the 8477 is pin-compatible with the 82077.


Are you saying that CCIV initially had an NSC 8477 or an 8473? Or that it had an Intel chip and when Intel came out with a new revision they went to an NSC chip? Also are all CCIVs retrofitable? i.e. can I order an NSC chip and plop it into my CCIV to get FM back? Finally can you drop in an NSC 8473 in a CCIV to get 128-byte MFM or the best you can do is switch to a NSC 8477? TIA!


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