AIM 65 lives

[M H Stein]

-------------Original message:
From: Andy Dannelley <andyda at earthlink.net>
Subject: AIM 65 lives

>Just a note of thanks for help and encouragement.  I finally got my AIM 
>back running again with the help of a local who had some test 
>equipment.

Congratulations! Sounds like ya had fun.

>Now the first thing I need to do is to get the 20 mil current loop to 
>RS-252 working so I can use my Mac as a terminal and program 
>development and storage.

Depending on your Mac's input sensitivity, it may work as is. The
AIM serial input (J1-Y) is RS-232 compatible (R24 should be 3K3; older
versions were only 1K). The output (J1-U) is of course TTL level which is
often adequate; if not and you've got +/- 12V available, an optoisolator 
does the trick, otherwise a Maxim MAX233 is a convenient single-chip
solution.

I'll send you the relevant app note off-list.

mike