21 Jun
2005
21 Jun
'05
2:59 p.m.
On 6/21/05, Joe R. <rigdonj at cfl.rr.com> wrote:
This one
<http://www.classiccmp.org/hp/PDP-8%20cards/PN%203021%206002.jpg> has a
symbol that looks like the National Semiconductor symbol but it has three
lightning bolts instead of two. It also has the number 3021 6002 on it. The
cables have been cut off so I have no idea what was on the other end of them.
That logo is Systems Industries, a disk and tape interface
manufacturer. I do not recognize the card, but it's possible that is
an interface to a crate of SI hardware that would talk directly to one
kind of disk or another.
This card
<http://www.classiccmp.org/hp/PDP-8%20cards/XEBEC%2001-100968.jpg> was made
by XEBEC and has the number 01-100968 on it. It has two 50 pin ribbon cable
headers on it.
Xebec also made disk and tape interfaces. No idea what goes on the other end.
-ethan