10 Jan
2003
10 Jan
'03
8:13 a.m.
Hello Greg,
I was looking for a DC003 Interrupt logic Chip and found your information on a website.
What I need is to know where I can find these chips and who to call. Any information will
be greatly appreciated. My information is below so if you can email me or call me, please
let me know.
Thank you
Andrew Rodriguez
Classic Components
23605 Telo Ave
Torrance, CA 90505
310 539 5500 xt 317
310 539 4500 Fax
www.class-ic.com
10 Jan
10 Jan
7:22 p.m.
--- Andrew Rodriguez <arodriguez(a)class-ic.com> wrote:
I was looking for a DC003 Interrupt logic Chip and
found your information
on a website. What I need is to know where I can find these chips and
who to call.
How many are you looking for? 1? 10? 1000? I might have one or
two in engineering spares.
-ethan
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11 Jan
11 Jan
6:58 a.m.
I tried to track down a source for the DC003 a couple of years
ago and came up with nothing. There are/were a few web sites which
listed the DC003 but nobody really seemed to have any.
Much as I hate to suggest this, if you *really* need a DC003 (to
repair a board, for example) about your only option is to remove
one from another board.
If memory serves, a DLV11J 4 port async serial interface would be
a good place to look since they are not particularly hard to find
and I *think* (sorry, I don't have one I can look at right now)
they have 4 DC003 chips on them.
Be aware that removing chips that are soldered to an existing board
without damaging them will almost certainly involve at least one of
the following:
- access to and expertise in using professional desoldering equipment
- destroying the board
Michael Davidson
Andrew Rodriguez wrote:
Hello Greg,
I was looking for a DC003 Interrupt logic Chip and found your
information on a website. What I need is to know where I can find
these chips and who to call. Any information will be greatly
appreciated. My information is below so if you can email me or call
me, please let me know.
Thank you
Andrew Rodriguez
Classic Components
23605 Telo Ave
Torrance, CA 90505
310 539 5500 xt 317
310 539 4500 Fax
www.class-ic.com <http://www.class-ic.com>
10:52 p.m.
--- Michael Davidson <michael_davidson(a)pacbell.net> wrote:
I tried to track down a source for the DC003 a couple
of years
ago and came up with nothing. There are/were a few web sites which
listed the DC003 but nobody really seemed to have any.
As I mentioned, I think I have a couple as spares... I used to
make and sell Qbus, Unibus and VAXBI boards. You won't find anything
about them on the web because I've never put up a web page on
them.
I got them when my former employer went out of business and I
bought the test fixtures and spares. We got them direct from
DEC. We used to buy entire Qbus logic sets and we didn't
use all of them (our board had a 68000 and 512K of RAM onboard,
so we didn't use the DEC method of handling word count, etc., for
DMA. I know we used DC005s on the BDAL lines, but without going
home and checking, I can't say from here exactly which parts we
did use and which ones just got stuck in foam and put in a box).
Much as I hate to suggest this, if you *really* need a
DC003 (to
repair a board, for example) about your only option is to remove
one from another board.
Oy! It's true that there is probably no ready supply, but has
anyone checked 1-800-DIGITAL (or whatever HP/Compaq uses for
legacy parts ordering)? No guarantees, but they have had lots
of stuff in the past that could only be located by a precise
part-number request.
If memory serves, a DLV11J 4 port async serial
interface would be
a good place to look since they are not particularly hard to find
and I *think* (sorry, I don't have one I can look at right now)
they have 4 DC003 chips on them.
Probably not 4 x DC003. Probably 4 x DC005. Probably 1 x DC003.
Be aware that removing chips that are soldered to an
existing board
without damaging them will almost certainly involve at least one of
the following:
- access to and expertise in using professional desoldering equipment
- destroying the board
Destroying the board is the easiest way to ensure the chip extracts
intact. It's tough to get the power pins free from a multi-layer
board (I've done it, but it sucks compared with being able to sacrifice
either the chip or the board).
In the old days, there were companies like ESS that did depot repair. If
the "Computer Hotline" still lists DEC repair companies, that would be a
place to start. I doubt you would find much on them on the web.
-ethan
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12 Jan
12 Jan
1:06 p.m.
Ethan Dicks wrote:
--- Michael Davidson
<michael_davidson(a)pacbell.net> wrote:
Since it's a 4 port serial card with each channel having both a TX
and RX interrupt associted with it, and the DC003 is the chip that
handles the interrupt request / acknowledge protocol for 2 interrupts
you actually *would* expect that there would be 4 x DC003 *and* 4 x DC005.
I just found my one "real" DEC DLV11J and it does, in fact have
4 x DC003, but only 3 x DC005.
My guess is that since the DLV11J occupies an unusually large range
of addresses they didn't need the address decoding capabilities
that a full set of 4 x DC005 would have provided and they substituted
a cheaper set of bus drivers / receivers for the 4th DC005.
Michael Davidson
If memory serves, a DLV11J 4 port async serial
interface would be
a good place to look since they are not particularly hard to find
and I *think* (sorry, I don't have one I can look at right now)
they have 4 DC003 chips on them.
Probably not 4 x DC003. Probably 4 x DC005. Probably 1 x DC003.
7864
days inactive
7866
days old
4 comments
3 participants
participants (3)
-
arodriguez＠class-ic.com -
erd_6502＠yahoo.com -
michael_davidson＠pacbell.net