Ampro Littleboard.

Ampro Littleboard.

Post by T.Bluck » Thu, 02 Sep 1999 04:00:00



Hello.
        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..

Many Thanks.
--
Tim.Bluck.

 
 
 

Ampro Littleboard.

Post by Greg Holdre » Fri, 03 Sep 1999 04:00:00


: Hello.
:         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

______________________________________________________________________

 
 
 

1. Ampro LittleBoard..

hello.
        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.

Many thanks.
--
Tim.Bluck.

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