On 12/19/18 5:38 PM, Ali via cctalk wrote:
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!
No, the CCIV initially had a plain-jane Intel rev 0 82077AA in a 68 pin
PLCC. After Intel "improved" the chip to the 82077AA-1, FM ceased to
work. Fortunately, as I mentioned NSC 8477 is a plug-in replacement,
with the exception of not needing an extra external cap (the pin is NC
on the National chip).