19 Dec
2018
19 Dec
'18
9:20 p.m.
On 12/19/18 5:38 PM, Ali via cctalk wrote:
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).
--Chuck
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.
Chuck,
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!