My Reply follows quote. On 20/12/2004 17:25 [EMAIL PROTECTED] said: >I'm sure an ADB-to-Plus adapter would involve a processor. You could use a >simple >microcontroller, like the Intel 8049 (the one used in the original >Macintosh and >IBM PC keyboards, by the way), or the Motorola 6808 (is it in production >still?) >to do the task. > >The hardware would be really simple: a small board with the >microcontroller and a >crystal. You get the power from the Plus' keyboard port, and both keyboard >ports' >data lines can be connected directly to microcontroller's I/O lines. But the >software could be more of a problem: you would need a program that >monitored both >ports in real time, keeping the right time and, in the case of the Plus' >port, >maintainig sychronismo with the port's clock line. I think it wouldn't be >a simple >task, but once written, producing it shouldn't be more expenive than the >cost of >the microcontroller, the circuit board and the needed cables and connectors. > >Greetings, > >Antonio Rodr�guez (Grijan) ><ftp://grijan.cjb.net:21000/> > >Jeff Walther ha escrito: > >> Are the specifications for the Plus keyboard protocol and the ADB bus >> protocol still available somewhere? With the inexpensive PALs >> available today, I would guess that there's a better than even chance >> one could whip up an adapter on the cheap, if one knew what signal >> conversions are needed. Getting the required information always >> seems to be a bear. I'm occasionally tempted to bid on some of the >> sets of Apple Developer CDROMs that show up on Ebay in hopes that >> they'll contain that kind of information. >> >> Jeff Walther --------- Somewhere in the "stack-o-Macs" I have a keyboard for a Plus that looks very much like an eary PC type extended keyboard. If the original poster is interested, contact me off-list and I will hunt it up.
Ken -- Compact Macs is sponsored by <http://lowendmac.com/>. Support Low End Mac <http://lowendmac.com/lists/support.html> Compact Macs list info: <http://lowendmac.com/lists/compact.shtml> --> AOL users, remove "mailto:"; Send list messages to: <mailto:[email protected]> To unsubscribe, email: <mailto:[EMAIL PROTECTED]> For digest mode, email: <mailto:[EMAIL PROTECTED]> Subscription questions: <mailto:[EMAIL PROTECTED]> Archive:<http://www.mail-archive.com/compact.macs%40mail.maclaunch.com/> --------------------------------------------------------------- iPod Accessories for Less at 1-800-iPOD.COM Fast Delivery, Low Price, Good Deal www.1800ipod.com ---------------------------------------------------------------
