12 Nov
2006
12 Nov
'06
8:14 a.m.
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.
We've come into a whole load of 74 and 75 series TTL chips as well as
load of Relays and Power Transistors and other assorted parts.
Once I get them all inventoried, I'll make a website.
Hopefully listmembers looking for classic IC's will find this to be a
useful cache of parts...
Al
Phila, PA
12 Nov
12 Nov
8:30 a.m.
Hi Al
These are 8041's. These are copies of Intel's 8041's. They are
similar to 8048's in code but have a port with handshake, similar
to that on a 8255. These chips are mask ROM chips but can
be connected to an exteranal EPROM.
As I recall, the major difference, other than the port was that
they could only use internal RAM ( but I could be wrong on that ).
Dwight
From: Al Hartman <alhartman at yahoo.com>
Reply-To: "General Discussion: On-Topic and Off-Topic
Posts"<cctalk at classiccmp.org>
To: cctalk at classiccmp.org
Subject: Help in identifying chip...
Date: Sun, 12 Nov 2006 11:14:20 -0500
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.
We've come into a whole load of 74 and 75 series TTL chips as well as load
of Relays and Power Transistors and other assorted parts.
Once I get them all inventoried, I'll make a website.
Hopefully listmembers looking for classic IC's will find this to be a
useful cache of parts...
Al
Phila, PA
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4:27 p.m.
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.
This is the NEC version of the Intel 8041. The 8041 is a microcontroller,
based on the well-known 8048 microcontroller family, but it also includes
an I/O port circuit that lets it appear and an I/O device on another
processor's bus. A very well-known application of this is the keyboard
interface in a PC/AT (or later) machine, this uses an 8042, which is the
same devce with more intenral ROM (and RAM?)
The 8041 is a mask-programmed device, which means a program was stored in
it when it was made. Do you have any idea what this program is (is there
a copyright on the chip (other than NEC or Intel)? A part number other
than 8041 (and a date code?)
-tony
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.
7:08 p.m.
On 12 Nov 2006 at 18:01, Brent Hilpert wrote:
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 (?).
If you look on the www.datasheets.org website and search for the
"upd8041", you'll find a nice datasheet. It's a 1K mask-programmed
ROM with 64 bytes of RAM MPU. This agrees with what's in my Intel
"Peripheral Design Handbook". FWIW, there's a sample application
(controlling a dot-matrix printer" using the 8041 in the PDH.
There is no memory expansion capability with the 8041, unlike the
8048. Intel packaged up the 8041 with some pre-programmed masks and
sold them as other chips. For example, the 8292 GPIB controller is
nothing more than an 8041 with Intel's own code.
Less'n you can identify what the 8041s you have were programmed with,
they're not going to be very useful.
Cheers,
Chuck
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.
8:24 p.m.
From: Brent Hilpert <hilpert at cs.ubc.ca>
---snip---
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 (?).
Hi Brent
You are right, I stand corrected, the 8041 can not be connected
to an external EPROM. The 8041 can but not the 8041. I recall
doing a project once but I must have been using a 8741.
Dwight
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13 Nov
13 Nov
6:55 a.m.
correction!
From: "dwight elvey" <dkelvey at
hotmail.com>
OOops! should have read " The 8048 can but not the 8041."
Dwight
From: Brent Hilpert <hilpert at cs.ubc.ca>
---snip---
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 (?).
Hi Brent
You are right, I stand corrected, the 8041 can not be connected
to an external EPROM. The 8041 can but not the 8041. I recall doing a project once but I must have been using a
8741.
Dwight
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alhartman＠yahoo.com -
ard＠p850ug1.demon.co.uk -
cclist＠sydex.com -
dkelvey＠hotmail.com -
hilpert＠cs.ubc.ca