26 Aug
2010
26 Aug
'10
5:09 a.m.
On 8/25/10, MikeS <dm561 at torfree.net> wrote:
Are you sure that they're PROMs?
They might be Burroughs numbers, but not PROMs (at least not the ones I
looked up).
For instance:
1447 3581 7438 4x2 NAND gate
1447 3540 7410 3x3 NAND gate
1447 3797 9322 4x2to1 MUX
2600 1495 7404 6xINV
Hey! I think I've got a tackle box full of stuff like this. One
drawer is marked "3581 '38" for example.
I picked up the tacklebox and the chips from a vendor at Dayton some years ago.
It's loaded with the following part numbers (dates listed are representative):
1447-3532 SN7404N 7909 (Nat'l Semi/Signetics/TI)
1447-3524 SN7408N 7650 (Nat'l Semi/Signetics/ITT/TI)
1447-3540 7410F 7915 (Nat'l Semi/Signetics/ITT)
1447-3565 7420 7907 (Signetics/ITT/TI)
1447-3607 SN7474N 7836 (TI/Fairchild/Signetics)
1447-3615 74107N 7912 (Nat'l Semi/Fairchild/Signetics)
1447-3557 74H11N 7738 (Nat'l Semi/ITT/Signetics)
1447-3581 7438N 7838 (Nat'l Semi/ITT/Signetics)
1447-3797 SN74157 7827 (Nat'l Semi/ITT/TI)
1447-3771 SN74161N 7701 (Nat'l Semi/TI/AMD)
1447-3755 74195 7644 (Signetics/TI/AMD)
1447-3722 74155 7709 (Signetics/TI)
1447-3714 SN74153 7832 (Nat'l Semi/Signetics/TI)
... plus a mish-mash in a bin marked "misc"... part numbers include 1447-*
* == 3599, 3706, 3623, 3698, 3789, 3649 and several more
Until this thread, I had no idea the 1447-* numbers were Burroughs.
Is anyone restoring such equipment and looking for spares? My own
interest are such that if I used these anywhere, it'd be to replace
parts gone bad in DEC M-series modules for my PDP-8/i and PDP-8/Ls.
In particular, I'm always hunting for 7474s since those seem to be
favored to fail in the gear I have (along with 7440s, statistically).
Is there a list of these part numbers? The ones I gave happen to be
listed with both the 1447-* numbers _and_ 74-series TTL numbers. The
misc drawer has numerous ones with only 1447-* numbers, and I'd like
to know what's what.
Cheers,
-ethan
3:45 p.m.
On 8/26/10, William Donzelli <wdonzelli at gmail.com> wrote:
Are you interested in specific ICs or just Burroughs parts in general?
I can count up part numbers and quantities if you like. I don't plan
on discarding them, but my interest is in the fact that they are
non-LS parts and I have 1960s DEC hardware that can use two or three
specific parts. If these parts can help a Burroughs owner, all the
better. Ultimately, they are just ordinary parts from the vendors of
the day, but I know I'd prefer to have them properly badged with the
8-digit part number, just for aesthetic reasons.
-ethan
Is anyone
restoring such equipment and looking for spares?
I can use Burroughs parts. 
5:37 p.m.
Are you interested in specific ICs or just Burroughs
parts in general?
In general.
?I can count up part numbers and quantities if you
like. ?I don't plan
on discarding them, but my interest is in the fact that they are
non-LS parts and I have 1960s DEC hardware that can use two or three
specific parts. ?If these parts can help a Burroughs owner, all the
better. ?Ultimately, they are just ordinary parts from the vendors of
the day, but I know I'd prefer to have them properly badged with the
8-digit part number, just for aesthetic reasons.
If you want some of my non-LS TTL stock in trade, that is fine.
--
Will
6:25 p.m.
On 8/27/10, William Donzelli <wdonzelli at gmail.com> wrote:
If you want some of my non-LS TTL stock in trade, that
is fine.
I should be at the Maker World's Faire next month. I can bring the
box. I don't know that I have enough empty tubes to package up that
many hundreds of ICs.
I would be especially interested in the following: 7474, 7410, 7420,
7430, 7440, 7450, 7453, 7460, 7482 (uncommon, I know, but even one or
two would be useful as spares for an M220 in an -8/L or -8/i). There
are a few "H" series parts in a Posibus -8, the 74H40 comes to mind.
Those I haven't really seen in the wild in some time.
-ethan
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