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Re: PS-2 Keyboard for Aplle II ?
- Subject: Re: PS-2 Keyboard for Aplle II ?
- From: Jay Maynard <jmaynard@thebrain.conmicro.cx>
- Date: Sat, 31 Dec 2005 02:16:48 GMT
- Newsgroups: comp.sys.apple2
- References: <yFgtf.1579$Hl6.1173@newsread3.news.pas.earthlink.net> <43b5e892$0$95958$742ec2ed@news.sonic.net>
- Reply-to: jmaynard@conmicro.cx
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- Xref: g2news1.google.com comp.sys.apple2:2798
On 2005-12-31, Don Bruder <dakidd@sonic.net> wrote:
> I'm thinking that's not possible - At least, not to interface with
> existing hardware/software. PS/2 keyboards are a flavor of serial. The
> II/II+ both operated on a switch matrix that the MB talked to
> more-or-less directly.
That depends. Just what does an Apple ][ keyboard look like to software?
It's fairly easy to talk to a PS/2 keyboard with a programmable
microcontroller such as the Atmel AVR series. (The PICs have a hardware
design deficiency that makes it much harder to do properly, since you can't
cleanly switch from input to output: you'll glitch the line.) It would not
be that difficult to build up an adapter with an AVR, serial on one side
talking to the PS/2 keyboard, whatever bits the Apple wants on the other.
--
Jay Maynard, K5ZC http://www.conmicro.cx
http://www.hercules-390.org http://www.tronguy.net
http://jmaynard.livejournal.com (Yes, that's me!)