30 Aug
2004
30 Aug
'04
12:18 p.m.
Philip Pemberton wrote:
Yee-upp - it's called the SMD Codebook:
<http://www.marsport.demon.co.uk/smd/mainframe.htm>
I had seen this, and although it did include the 5A part, there was no
mention of a K lying on it's back. I was hoping somebody would say the
reclining K was used by "Diodes-Are-Us" and I could find a data sheet.
I probed the chip on the good board and it looks like pin 1 is connect
to SIMM pin 72 through a 1k resistor and pin 3 is connected to SIMM pin
42. Pin 2 seems to be connected to nothing. If I probe across the chip
from pin 1 to 3 I see a wierd negative resistance one
way and a positive
resistance the other. There is probably a capacitor somewhere
messing
with the meter.
I don't have any idea what the pinout is. I searched a bit, and pin 72
might be ground and pin 42 was either a data bit or a column address strobe.
I might tack a 1N914 between pads 1 and 3 and see what happens.
-chuck