1 Jul
2012
1 Jul
'12
1:42 p.m.
Hi,
I'm doing a circuit diagram of a SA1100 Disc Controller built
with a Z80 CPU. On the controller, I have two blue devices
lables "Z80 CLK DRV" on the board, and HPI-1014-782 on the
device itself. the "-782" is the date of production most
likely. I have no idea about the pinout of those devices nor
do I know where to finde datasheets to make a component for
my CAD software.
I cna't help wit hthe pinout, but I can guess the function.
IIRC the clock input of the S80 is not actually TTL compatible, it needs
to be pulled up to the 5V line.My guess is that thes are clock driver
cirucits for this signal, they take a TTL level singal in and give out
the genuine 5V signal for the Z80 clock input.
How may pins do they have, and how many can you easily trace on the
board? I am guessin there are at least power, ground, an output to the
Z80 clcok pin and a TTL level input. Any others?
-tony