10 May
2008
10 May
'08
12:10 p.m.
PCBs with edge connectors really drive the costs up
because specialized
prototype boards are required or if you manufacture the PCBs using edge
connectors and gold fingers are extra.
It's very strange--at one time Radio Shack (under their "Archer"
brand) sold 22/44 position edge-connector prototyping cards, in
phenolic, rather than FR4 and with tinned, rather than gold-plated
fingers. Vector had similar prototype cards as well. It's kind of
hard to believe that they're all gone now, since at one time, they
were very common.
Cheers,
Chuck
10 May
10 May
8:50 p.m.
On Saturday 10 May 2008 12:10, Chuck Guzis wrote:
I still have some of those, and maybe one or two of the connectors used with
them, and they did have a variety of them out over the years. One was some
kind of blue-colored material, some were indeed FR4 or similar, hole
patterns varied all over the place, some had buses and some didn't.
I may still have a rack cabinet that had a bunch of stots for those, or at
least the shorter ones, it wouldn't take the taller ones without them
sticking out of the top.
I haven't looked at what Vector offers at any time in recent years, are you
sayng that they don't offer that kind of card any more?
Oh, and these aren't STD bus, which is 56 pins rather than 22/44. :-)
--
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
PCBs with edge
connectors really drive the costs up because specialized
prototype boards are required or if you manufacture the PCBs using edge
connectors and gold fingers are extra.
It's very strange--at one time Radio Shack (under their "Archer"
brand) sold 22/44 position edge-connector prototyping cards, in
phenolic, rather than FR4 and with tinned, rather than gold-plated
fingers. Vector had similar prototype cards as well. It's kind of
hard to believe that they're all gone now, since at one time, they
were very common. 
11:51 p.m.
Hi
I used to make systems with std bus boards. We used board
with a Z80. These had a serial port and some parallel port as
well. I forget the name of the manufacture.
I had a Forth running on them that I implemented from
a F-83 version.
We made many of our own parallel I/O cards. It seems like the
manufactures of these thought 16 outputs was a lot. We made boards
with as many as 64 ins or outs.
We had an extended card that could sample 32 RTDs on an interrupt
driven system. We'd load as many as 6 of these cards on a single
Z80 and still have it run a front panel.
I still have a number of boards and maybe 3 or four racks. I expect
to play with them some day.
Dwight
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