🚀 go-pugleaf

In article <May.27.21.30.32.1990.23246@topaz.rutgers.edu>, armhold@topaz.rutgers.edu (George Armhold) writes:
> 
> Our lab owns an HP Scanjet Image Scanner.  I'm trying to write a driver for 
> for our Amiga 2000 using the Amiga's parallel.device.  I can successfully 
> execute any commands that don't require the scanner to send any data 
> back to the Amiga.  However, any commands that are supposed to return any data 
> do not work.  I can send escape codes to the scanner and make it seek, turn 
> the light on, and perform a 'scan test', but I can't seem to _read_ any data 
> _from_ the scanner.  Any commands that are supposed to make the scanner 
> send out data just seem to do nothing.  Does HP use some strange kind of 
> handshaking in their scanner?  (I'm using the HP developer manual for the
> escape codes, but there is no mention of the hardware interface.)  All the
> other machines in our lab (HP PC's and Mac IIcx's) all use HP manufactured
> interfaces, so there is no problem communicating with the scanner.
> 

Does the Amiga parallel device support data input?  Most parallel devices
don't.  This is why the ScanJet for the IBM PC came with a parallel board.