frank@zen.UUCP (Frank Wales) (03/08/88)
In article <431@usl> rsk@usl.usl.edu.UUCP (Reddy S. Kosireddy) writes: >For quite some time, I was wondering if there are *ANY* handheld computers >having an IO port or some thing similar. The HP-41 has four I/O ports for memory expansion and peripheral attachment; the HP-71 has four + two 'specials'. Each machine supports: extra RAM; application ROMs; a barcode wand (HP-41 wand from HP, HP-71 wand from us); EPROM modules (HP-41 EPROM from us, HP-71 EPROM from CMT). Both also support HP-IL, which allows connection to as many peripherals as you can afford to throw money away on (printers, disks, video, HP-IB and RS232 interfaces, measurement equipment, etc., etc.); all at once if you like. >Well, you sure can imagine a LOT of interesting applications. There *are* a LOT of interesting applications (I've written some of them :-)). >Or, is there some way of constructing some thing like this by having some >external circuitry to a HP (or some other) handheld computer. I am an >Electrical and Computer Engr, and LOVE to do some thing like this. That's been done too. Though rolling your own hardware to talk to HP's is not something you'll do in a weekend. If you want to find out more about what has been (and is being) done with HP handhelds, join a User Group. I posted details of all known active User Groups a while back; I can mail it to anyone interested. -- Frank Wales, Development Engineer, [frank@zen.uucp<->mcvax!zen.co.uk!frank] Zengrange Ltd., Greenfield Rd., Leeds, ENGLAND, LS9 8DB. (+44) 532 489048 x220