14 Dec
2015
14 Dec
'15
6:06 a.m.
On 14/12/15 13:12, tony duell wrote:
I agree, especially as it looks like pins 8-14 are commoned
to the power?-plane.
I wondered whether P1,P2 and P3 could be decoding PROMs
to convert ASCII to Tilt/Rotate. In which case there must be
separate solenoid drivers somewhere.
The 7475s are 4-bit latches, so maybe it pushes out 4 bits
at a time? But I think there would be enough on there to
do the interfacing, so are you sure it only uses 10 pins on
the DB-25?
--
Lawrence Wilkinson lawrence at ljw.me.uk
The IBM 360/30 page http://www.ljw.me.uk/ibm360
Can anyone
give me a clue as to the purpose and pinouts of an Allen
Bradley 314B102??!!
First guess, it's not really an IC, it's a resistor
array. Either separate resistors
going across the chip or resistors all commoned to the highest numbered
pin (which may well be +5V).
I would secondly guess that '102' means 1k (10*10^2)
-tony