armhold@TOPAZ.RUTGERS.EDU (George Armhold) (05/27/90)
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. Thanks, =George