Re: Received an interesting Apple II Clone

[David Wilson <mcs6502@gmail.com>]

On Apr 2, 1:42 pm, Conrad <conrad.ru...@gmail.com> wrote:
> Mine does have the chinese character generator, and yes you are right
> that it is DE-9.  Mine is the 312, and I don't have the expansion box,
> but I do have the dual floppy drive.  Any help getting a keyboard
> working would be appreciated.

You will either need to find a spare MPF-III keyboard or build a
replacement.

The pin-out of the DE-9 is as follows (all signals are outputs from
the keyboard apart from +5V & GND):

1 PB1 (aka solid Apple)
2 +5V
3 GND
4 KBDATA
5 KBCLK
6 KBSTB
7 PB0 (aka Open Apple)
8 /KRS (system reset)
9 AKD (any key down)

KBCLK goes to pin 8 of a 74LS164 while KBDATA goes to pin 2.
The data stream is B0..B7 (lsb first) clocked on the rising edge)

KBSTB clocks 1/2 74LS74 with KBDATA fed to the D input.

The original keyboard has an 8048/8748 uC scanning the keys and
outputting the KBSTB/DATA/CLK signals. I do not have the code for this
uC but can develop a functional description if anyone wants to
replicate it.

Do you have a complete set of manuals for the MPF-III?