Does anyone know the i/o address of the parallel
port on this board? I'd like to write some code to write
data to it directly, and also to read the status bits..
8 data bits 01h write output data byte
data strobe 02h write sets the data strobe flip-flop
data strobe 03h write clears the data strobe flip-flop
The data strobe is cleared upon powerup or board reset.
busy line connected to DART RIB input. The DART channel B
must be read to read the RIB status. In order to
correctly read the state of the printer busy signal
, DART channelB first must be sent a Reset External
Status command. Note: the sense of the signal is inverted
:if busy = 1, RIB detects a low (inactive) state.
Conversely if busy = 0, RIB detects a high (active) state.
DART 80h ch A data
84h ch A control
88h ch B data
8ch ch B control
Greg Holdren Hewlett Packard
Hardware Development Engineer 8000 Foothills Bvd, MS 5558
Network Peripheral Solutions Division Roseville, CA 95747-5558
Does anyone know the address of the parallel port on
an Ampro LittleBoard Z80? I'd like to be able to send data to
it, and also if possible read the inputs too. (I have an L.C.D.
display plugged into the port and I'd like to write some code
to talk to it.