10 May
2008
10 May
'08
12:17 p.m.
Date: Fri, 9 May 2008 10:59:35 -0700 (PDT)
From: "Eric Smith"
The lead pitch of shrink DIP packages is 0.070 inch
(1.78 mm). I
haven't seen any 0.050 (1.27 mm) inch DIPs. Shrink DIPs were popular
with Japanese semi companies, but never caught on very well with US
companies, most of which skipped those and went straight to PLCC and
PQFP packages.
Right you are--I dug out a couple of shrink DIPs and they are indeed
0.070 inch. Unless you're going right to PCB, these are a real pain
to deal with today--hard to find sockets, odd spacing, etc. I think
I've still got a couple of 64180s in this package kicking around
somewhere.
Thanks for the correction.
Cheers,
Chuck
10 May
10 May
8:52 p.m.
On Saturday 10 May 2008 12:17, Chuck Guzis wrote:
I haven't measured them but I do have about four or so HD6303Y (Hitachi CMOS
68xx variant with bunches of built-in peripheral stuff) that's in a package
like that. I managed to score *one* socket of the wire-wrap variety as a
sample at some trade show I was at years ago, but am not 100% sure that it's
standard 0.025" wrap posts, in which case I'm still screwed on being able to
do anything with them.
--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, ?a critter that can
be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin
Date: Fri, 9
May 2008 10:59:35 -0700 (PDT)
From: "Eric Smith"
The lead pitch of shrink DIP packages is 0.070 inch (1.78 mm). I
haven't seen any 0.050 (1.27 mm) inch DIPs. Shrink DIPs were popular
with Japanese semi companies, but never caught on very well with US
companies, most of which skipped those and went straight to PLCC and
PQFP packages.
Right you are--I dug out a couple of shrink DIPs and they are indeed
0.070 inch. Unless you're going right to PCB, these are a real pain
to deal with today--hard to find sockets, odd spacing, etc. I think
I've still got a couple of 64180s in this package kicking around
somewhere.
Thanks for the correction. 
9:20 p.m.
Roy wrote:
I haven't measured them but I do have about four
or so HD6303Y (Hitachi
CMOS 68xx variant with bunches of built-in peripheral stuff) that's in a
package like that. I managed to score *one* socket of the wire-wrap
variety as a sample at some trade show I was at years ago, but am not
100% sure that it's standard 0.025" wrap posts, in which case I'm still
screwed on being able to do anything with them.
All the WW shrink-DIP sockets I've seen used standard 0.025" square posts.
Example: Mill-Max p/n 127-93-664-41-002000 (two level) or
127-93-664-41-003000 (three-level). They cost over $20 each though,
and they're not stocked by the distributors, so you'd have to order at
least 56 pieces.
If I really wanted to wire-wrap to a 64 SDIP, I'd get a non-WW SDIP
socket, which are readily available and relatively inexpensive, and plug
that into 64 individual WW socket pins. You can either buy the WW
socket pins separately, or just remove them from normal WW DIP sockets.
In the past, I've made my own WW PGA sockets by knocking the pins out
of normal WW DIP sockets (by putting a copper tube over the pin, then
hitting it with a hammer), then pressing those into perf board with the
holes drilled out to just less than the pin diameter. I think Richard
Ottosen came up with that method.
Eric
10 p.m.
On Saturday 10 May 2008 21:20, Eric Smith wrote:
Roy wrote:
Good to know...
I haven't measured them but I do have about
four or so HD6303Y (Hitachi
CMOS 68xx variant with bunches of built-in peripheral stuff) that's in a
package like that. I managed to score *one* socket of the wire-wrap
variety as a sample at some trade show I was at years ago, but am not
100% sure that it's standard 0.025" wrap posts, in which case I'm still
screwed on being able to do anything with them.
All the WW shrink-DIP sockets I've seen used standard 0.025" square posts.
Example: Mill-Max p/n 127-93-664-41-002000 (two
level) or
127-93-664-41-003000 (three-level). They cost over $20 each though,
and they're not stocked by the distributors, so you'd have to order at
least 56 pieces.
Or find another trade show and scarf up some more samples... :-)
If I really wanted to wire-wrap to a 64 SDIP, I'd
get a non-WW SDIP
socket, which are readily available and relatively inexpensive,
I haven't seen them anywhere, but then I haven't looked. These chips were
originally soldered in to boards on which I did upgrades -- in each case I
removed the chip and a 27C256 and installed a replacement chip that had
masked ROM onboard.
and plug that into 64 individual WW socket pins.
Good idea.
You can either buy the WW socket pins separately, or
just remove them from
normal WW DIP sockets.
In the past, I've made my own WW PGA sockets by knocking the pins out
of normal WW DIP sockets (by putting a copper tube over the pin, then
hitting it with a hammer), then pressing those into perf board with the
holes drilled out to just less than the pin diameter. I think Richard
Ottosen came up with that method.
I'm still looking at having to drill out some holes in the perfboard I end up
using that's going to correspond to that weird spacing, though. Which can
wait until I get around to the drill-press accessory for my dremel...
--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, ?a critter that can
be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin
11:02 p.m.
On Saturday 10 May 2008 22:27, Eric Smith wrote:
Roy wrote:
That thought occurred to me too, which means I need to get some of those itty
bitty little saw blades or something similar for the dremel. Either way I
gotta buy more than I have now. :-)
--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, ?a critter that can
be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin
I'm still looking at having to drill out some
holes in the perfboard I
end up using that's going to correspond to that weird spacing, though.
I just cut two slots and epoxied the socket in place. 
11 May
11 May
12:07 a.m.
From: rtellason at verizon.net
On Saturday 10 May 2008 22:27, Eric Smith wrote:
Hi
The metal blades will dull quickly on fiberglass boards. The cutting
disk will work but tend to gum up.
Do remember to clamp the work and use both hands to hold
the dremel.
I was using one of the metal blades once and thought I could
do just a little more touch up. I was holding the work piece
in one hand and the dremel in the other. The blade caught
in the work piece and the blade ran across the back of my finger
for about an inch and a half before cutting through my nail and
around to the pad of my finger, for about another half inch.
It happened so fast that it was all over in a small fraction of
a second( It made a bang sound ).
I feel a little foolish but it was a lesson learned. The dremel
is a great tool but must be treated with respect.
Dwight
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Roy wrote:
That thought occurred to me too, which means I need to get some of those itty
bitty little saw blades or something similar for the dremel. Either way I
gotta buy more than I have now. :-)
I'm still looking at having to drill out some
holes in the perfboard I
end up using that's going to correspond to that weird spacing, though.
I just cut two slots and epoxied the socket in place.
5893
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5894
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