12 Nov
2006
12 Nov
'06
6:01 p.m.
Al Hartman wrote:
I have a load of these chips from NEC... Can anyone
help me identify them?
NEC D8041C
It's a 40-Pin DIP Chip. And I've been unable to find any information
on-line about it.
There is a (partial) datasheet for the 8041A at
http://www.datasheetarchive.com/datasheet.php?article=3867872
Includes a block diagram and electrical specs but does not include the instruction
set encoding, which is in the class of "UPI Instruction Set", the spec for
which I have yet to find - should probably look for the 8048 datasheet.
I will happily accept being corrected but the block diagram implies that it is
not possible to use an external ROM for the 8041A, so you may be stuck with
whatever is fixed in the internal ROM, which would make them more-or-less
useless. Perhaps the D8041C differs from the 8041A (?).
http://www.datasheetarchive.com is pretty good as a free datasheet source.
I was just looking up datasheets for a bunch of microcontrollers
(8741,80C32,8751...) a few days ago. Sometimes you have to widen the search.
For example, in your case, "D8041C" produces no match, but "8041"
does.
Unfortunately they have moved to Acrobat 6 pdfs for some scans, making a lot
of the datasheets unreadable to those using older browsers. I was just trying
to get
data for the 68HC11. It's there but I can't display it.