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These boards are an easy "single circuit board" solution to managing multiline "1A2"
business phones popular in the 1950's - 1980's in the United States and other countries,
collectively called "key systems".
The current version of this board is REV-J5A.
Board revisions are, in progression of new-to-old:
J5A,
J5,
J4,
J3,
J2,
J1,
H / H1,
G1,
G,
F1,
F,
E,
B.
You can see the entire revision history
which describes in great detail what's different in each board revision.
If you're interested in these boards,
contact erco@seriss.com
with the email Subject: "1A2 KSU Inquiry" and I can supply ordering info for
fully assembled/tested boards. Try to include info on which phone models you expect
to use with the board, and any other details/questions you can think of.
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