10 Jan
2007
10 Jan
'07
4:44 p.m.
One of my rqdx3 boards suffered a trauma in a previous life and one of
the "DC005" chips at the bottom cracked in half. Needless to say the
board does not work.
I removed the old chip, but what now?
Does anyone have a spare DC005 or know of a suitable replacement? I
assume this is one of the magic DEC chips for qbus.
I suppose I could try extracting one from another board, but that is
pretty painful... dips are easier to get out if you can snip their
leads.
-brad
10 Jan
10 Jan
5:48 p.m.
I used to watch eBay for 'junk' QBus cards like DRV11W, etc. as a source
of spare parts of DEC specific ICs.
Clint
On Wed, 10 Jan 2007, Brad Parker wrote:
One of my rqdx3 boards suffered a trauma in a previous life and one of
the "DC005" chips at the bottom cracked in half. Needless to say the
board does not work.
I removed the old chip, but what now?
Does anyone have a spare DC005 or know of a suitable replacement? I
assume this is one of the magic DEC chips for qbus.
I suppose I could try extracting one from another board, but that is
pretty painful... dips are easier to get out if you can snip their
leads.
-brad
11:01 p.m.
In article <Pine.LNX.4.64.0701101047110.26427 at porky.vax-11.org>,
cctech at porky.vax-11.org writes:
I used to watch eBay for 'junk' QBus cards
like DRV11W, etc. as a source
of spare parts of DEC specific ICs.
Ooooh, that's a good idea, not only for fixing existing boards, but
for prototyping new ones :-).
--
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8:48 p.m.
On 1/10/07, Brad Parker <brad at heeltoe.com> wrote:
One of my rqdx3 boards suffered a trauma in a previous
life and one of
the "DC005" chips at the bottom cracked in half. Needless to say the
board does not work.
Ow!
I removed the old chip, but what now?
Does anyone have a spare DC005 or know of a suitable replacement? I
assume this is one of the magic DEC chips for qbus.
It is a DEC "magic Qbus chip". We used to buy the DEC "Qbus Chip
Kit", but we did use the DC005 to talk to the bus (just not their DMA
chips). If you needed some other Qbus spare, I would probably have
it, but we used all of our DC005s in our product. I know some 3rd
party vendors used to use chips like the 72LS240 to interface to the
Qbus, but I doubt they are pin-compatible nor even function-compatible
with a DC005. Of course a '240 won't have the same bus loading, etc.,
but for a single-backplane system, you'd probably never know the
difference.
I suppose I could try extracting one from another
board, but that is
pretty painful... dips are easier to get out if you can snip their
leads.
They are much easier to get out if you don't care about the board.
-ethan
6571
days inactive
6571
days old
3 comments
4 participants
participants (4)
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brad＠heeltoe.com -
cctech＠porky.vax-11.org -
ethan.dicks＠gmail.com -
legalize＠xmission.com