Further to my request for information to complete and operate the memory
keyer kit,
I was asked to post what chips are used on the 2-5/8 x 4-1/2 inch boards.
Here is the list:
Please remember that I have a hard time seeing such small print these
days... :o)
Board 1
7474, 3
7400, 3
7410, 1
NE-555, 1 Old friend, timer.
Board 2
7493, 3
7402, 1
7473, 1
2102a, 3 look like memory chips
21022a, 1
There are a set of 10 wires that connect from board to board, labeled "A"
through "J".
These cards are professionally etched and bear the identification, "GCH",
but the keyer is a kit. Some wires are dangling and it is obviously not
completed, but does not look like it will take a lot to make operational.
Anyone recognize this old one? Better yet, anyone have information for me
to finish it?
Please answer directly to jallen@internorth.com
Thanks,
J.,
VY1JA
|