Can anyone id these DEC PDP-8(?) cards? Also pictures on my PDP-8 cards

[Ethan Dicks]

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