26 Nov
2007
26 Nov
'07
3:28 p.m.
On Mon, Nov 26, 2007 at 01:42:36PM -0500, Roy J. Tellason wrote:
On Saturday 24 November 2007 23:31, Ethan Dicks
wrote:
Oops... my fingers were probably thinking 25.4mm to the inch when I mistyped
the 4.
The User Port on all the C= machines is
more-or-less the same... 12x2
0.154" edge connectors.
I thought those were 0.156"? I'm trying to remember what all edge connectors
used to be common. I'm
thinking that 0.1", 0.125", and 0.156" were some of the more common
sizes
of connector finger out there.
Those all sound common.
And how many pins?
Various ones... For the C= line, 6/12 and 12/24 were common (cassette
port, User Port, IEEE-488), but the VIC-20 had a 22/44 @ 0.156" expansion
connector. The C-64 was much smaller, but I can't reliably recall the
numbers off the top of my head, so I won't guess.
Seemed to me there was an
awful lot of stuff out there that used 22/44 pins of 0.156" spacing.
Very common. My COSMAC VIP has a pair of those (one for memory, one
for I/O expansion), and there was a standard RCA CPU board that used it
as its off-board bus connector. There was the STD bus, and I'm sure
many more examples from the 1970s and 1980s.
-ethan
--
Ethan Dicks, A-333-S Current South Pole Weather at 26-Nov-2007 at 23:20 Z
South Pole Station
PSC 468 Box 400 Temp -25.6 F (-32.0 C) Windchill -46.6 F (-43.7 C)
APO AP 96598 Wind 7.9 kts Grid 358 Barometer 681.7 mb (10564 ft)
Ethan.Dicks at usap.gov http://penguincentral.com/penguincentral.html