Reverse Engineering 15 yr old electronics

[Tony Duell]

> of the electronics?  There are two cards, with standard TTL and analog 
> parts.  The printed circuit has a design date of 1985, while the IC's have 
> 88-89 dates.

One thing I forgot to mention in my last message. Get a good continuity 
tester. 'Good' means one that is not fooled by diode junctions (and 
preferably not by low-ish resistors), one that doesn't supply enough 
voltage or current to damage anyting, one that beeps, and one that beeps 
quickly (you want to be able to 'stroke' a probe along a line of pins to 
see if a given connection goes to any of them).

The continiuty beeper in my old Fluke 85 is fine, for example.

-tony