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MacPlus/512k/128k keyboard-adapter project

 
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kbdbabel



Joined: 02 Jul 2007
Posts: 3
Location: Germany Kˆln

PostPosted: Mon Jul 02, 2007 9:03 pm    Post subject: MacPlus/512k/128k keyboard-adapter project Reply with quote

Hello to all pre-ADB Mac Users,
I like to announce an open source, open hardware keyboard protocol
adaptor project to connect the MacPlus keyboard protocol and PS2.

With this adaptor, you can connect your original MacPlus-keyboard
to your PeeCee, or you can take a mass-production-PS2-keyboard
to run your MacPlus, if the original keyboard is lost or broken.

The Hardware is based on an low-cost AT89C2051 8051 type
microcontroller and will fit for both, translation from
a PS2-Keyboard to a MacPlus Computer or vis versa from
the MacPlus Keyboard to a PS2-Host.

Note: do not use telephone-headset-cables as keyboard cable!
telephone cables are connected in roll-over mode
while the mac-keyboard cable is straigt-through.

There are two firmware versions available:
kbdbabel_ps2_macplus_8051.asm from PS2-keyboard to the Mac
and
kbdbabel_mac_ps2_8051.asm from the MacPlus keyboard to PS2.

Note: if you want to switch the direction on the adaptor,
you need to change or re-program the micronontroller.

Note2: This adapter may be used as well for Mac 512k / Mac 128k,
when some adaptions on the scancode translation table are made.
Sorry, I did not get my hands on a Mac512k/Mac128k keyboard
to analyze the protocol.

Some documentation about the Mac Plus Keyboard protocol
is available as well (draft, germand keyboard)
http://kbdbabel.sourceforge.net/doc/kbdbabel_dev_doc_macplus_20070606.pdf

Schematic, PCB mask and firmware source code is available here
http://kbdbabel.cvs.sourceforge.net/*checkout*/kbdbabel/kbdbabel/kbdbabel-mac-ps2/89c2051-mac-ps2_sch.eps
http://kbdbabel.cvs.sourceforge.net/*checkout*/kbdbabel/kbdbabel/kbdbabel-mac-ps2/89c2051-mac-ps2_pcb.eps
http://kbdbabel.cvs.sourceforge.net/*checkout*/kbdbabel/kbdbabel/kbdbabel-mac-ps2/kbdbabel_mac_ps2_8051.asm
http://kbdbabel.cvs.sourceforge.net/*checkout*/kbdbabel/kbdbabel/kbdbabel-mac-ps2/kbdbabel_ps2_macplus_8051.asm

The open software is licensed under the terms of the GNU GPL,
schematics and designs under Creative Commons CC-BY-SA 2.5.

More information, and other keyboard adaptors can be found on
www.kbdbabel.org

cu from Cologne, Alexander / kbdbabel
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Bolle



Joined: 08 Jun 2007
Posts: 8
Location: Strausberg b. Berlin

PostPosted: Wed Jul 04, 2007 7:41 pm    Post subject: Reply with quote

can i mirror that on 68kmla?
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MacOS
Site Admin


Joined: 19 Jan 2005
Posts: 304
Location: Berlin, Germany

PostPosted: Wed Jul 04, 2007 10:34 pm    Post subject: Reply with quote

Thanks for that one!
Some MacPlus I sold where without a Keyboard cable - the only missing part!
Now there is hope for those poor owners to get a keystroke back on the screen. Hardware Honored

I also give you space for a mirror if you like! Just let me (us Smile know.
_________________
MacOS aka Oliver
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kbdbabel



Joined: 02 Jul 2007
Posts: 3
Location: Germany Kˆln

PostPosted: Thu Jul 05, 2007 9:20 am    Post subject: Reply with quote

shure, mirror my posting if you like.

Missing keyboard cables can be replaced with modified cables for telephone headsets.
Just chop off the plug on one side and replace it with a new plug fitted in the opposoite direction.
Maybe the electronic shop offering the western 4p4c-plugs has the right crimp tool available.
Cables and plugs usually just cost a few cents.

But never try the un-modified cable, this may or likely will destroy keyboard or computer.
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