20 May
2005
20 May
'05
12:06 a.m.
"Joe R." wrote:
Correct but I still haven't found any Fairchild 36xx part numbers so I'm
still not sure what these two parts are. Fairchild did build some memory,
the ram was PN 3530 (I THINK!).
Well, one can resort to procedures like using an ohmmeter to measure the characteristics
of each pin of the IC relative to the power supply pins (presuming you're reasonably
sure which are the power supply pins), figuring out the characteristics (readings) which
distinguish between input and output pins, drawing a pinout of inputs vs. outputs and see
if the result matches the known 1101 pinout.
Somewhat problematic because of the non-linear characteristics of the semiconductor
junctions being measured (different ohmmeters have different responses on different ranges
to semi junctions), but sometimes you can derive enough information to figure (something)
out.