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- Path: sparky!uunet!cs.utexas.edu!zaphod.mps.ohio-state.edu!sol.ctr.columbia.edu!destroyer!cs.ubc.ca!unixg.ubc.ca!kakwa.ucs.ualberta.ca!access.usask.ca!mizar.cc.umanitoba.ca!shad04
- From: shad04@ccu.umanitoba.ca (Dan Fandrich)
- Subject: Re: IBM keyboard to CBM
- Message-ID: <By52zA.J7y@ccu.umanitoba.ca>
- Sender: news@ccu.umanitoba.ca
- Nntp-Posting-Host: benford.cc.umanitoba.ca
- Organization: University of Manitoba, Winnipeg, Manitoba, Canada
- References: <92324.081236EAO102@psuvm.psu.edu>
- Date: Sun, 22 Nov 1992 22:40:22 GMT
- Lines: 93
-
- In article <92324.081236EAO102@psuvm.psu.edu> Ernie Oporto <EAO102@psuvm.psu.edu> writes:
- >I have heard of a project where you can take an IBM 101-key keyboard
- >and connect it to a C128. If anyone has any documentation on this
- >project, please let me know. I'm really interested in doing this to
- >my machine.
-
- Here's a message I saved from last year. I haven't actually tried the i/f
- myself, so I can't supply any more info. Also, fingering the jomby address
- yields no such user. Hopefully the author changed his mind and allowed the
- plans to be made available via ftp somewhere.
-
-
- From: kolstad@jomby.cs.wisc.edu (Joel Kolstad)
- Newsgroups: comp.sys.cbm
- Subject: Wanna use a PC Keyboard with your C-64?
- Message-ID: <1991Apr16.035008.5667@spool.cs.wisc.edu>
- Date: 16 Apr 91 03:50:08 GMT
- Sender: news@spool.cs.wisc.edu (The News)
- Organization: U of Wisconsin CS Dept
- Lines: 66
- Originator: kolstad@jomby.cs.wisc.edu
-
- From: kolstad@jomby.cs.wisc.edu (Joel Kolstad)
- Newsgroups: comp.sys.cbm
- Subject: Wanna use a PC keyboard with your C-64?
- References:
- Sender:
- Followup-To:
- Distribution: world
- Organization: U of Wisconsin CS Dept
- Keywords:
-
- Well, after becoming very frustrated with my always dirty, rarely working
- very well original Commodore 64 keyboard, I decided to built myself an
- IBM PC to Commodore 64 keyboard interface.
-
- I finished this little hack this past weekend, and am now happily typing
- on a Bondwell PC-XT keyboard going through my circuit to a C-64 (this
- was about the cheapest PC keyboard I could find... $25 from Lesko's, in
- Wisconsin...).
-
- The circuit is quite simple... just two chips: An Intel 8748 microcontroller
- (yes, ancient, I know) and a (New! :-) ) Dallas Semiconductor's 8x8 Cross
- Point switch. (What's rather ironic, here, is that many PC keyboards,
- including this one from Bondwell, use 8x48s themselves! :-) )
-
- The 8748 just watches the PC keyboard's scan codes, and figures out what to tell
- the 8x8 Cross Point switch to do -- that is, what keys to "fake" on the
- Commodore 64 keyboard.
-
- I think I did a decent job on the tiny program that runs the 8748... Caps lock
- is supported, Num lock is supported, shifted PC keys function like their 64
- counterparts should, hitting arrow keys on the PC keyboard automatically
- adds shifts when needed, etc. Overall, pretty much transparent to the user.
- The only place wher there are a few quirks is in "non-standard" characters
- such as vertical bars, tildes, etc. I tried to map this characters into
- the most standard C-64 keys I could, but by their natur of being non-
- standard keys, how perfect the translation is depends on what the program
- is looking for. :-) Also, sending "impossible" key combinations (like,
- hitting Shift-2 (@) and U and the same time on the PC keyboard) won't
- produce useful results. But I wouldn't expect it too...
-
- Personally, my C-64 and its assorted hardware lives in a big metal box, so it
- was no problem to stick in another board. But for people who would want to
- keep their original cases, it'd probably be possible to just drill a hole
- for the keyboard connnector in the case, anad keep the circuit board inside.
- Since this thing uses a crosspoint switch, a simple passthru lets both the
- C-64 and PC keyboard work at once -- now there's where we could see
- some productivity! But more importantly, this means you can still use the
- C-64 keyboard when there isn't a PC keyboard plugged in.
-
- Sound useful? Good! Since I doubt I could ever generate enough interest
- in this to make any money, I'm releasing it as more or less "public domain
- hardware." If anybody wants a schematic or more information, you can
- mail me at my below e-mail address. Sorry to say that I can only provide
- HPGL or Epson printer dump outputs. If you want the code for the 8748,
- you can have Intel Hex format, or UUencoded binary.
-
- I'd appreciate it if anyone sending for schematics and/or 8748 listings
- keep the things off of FTP sites, and such, for awhile -- I might just
- try to sell this to some magazine. :-) All of you who want more
- information, then, are my close personal friends and beta testers. :-)
-
- That's about it. I hope someone out there finds this as useful as I have --
- I _love_ my new keyboard!
-
- ---Joel Kolstad
- kolstad@jomby.cs.wisc.edu
-
-
- >>> Dan
- --
- Internet: shad04@ccu.umanitoba.ca Compu$erve: 72365,306
-