Re: Received an interesting Apple II Clone

[Conrad <conrad.russo@gmail.com>]

On Apr 1, 9:13 pm, David Wilson <mcs6...@gmail.com> wrote:
> 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?

I don't have the full set of manuals.  I'm going to see what I can do
to adapt an original Apple II keyboard to it.  The pinout there really
helps.  Is there no way to dump the code from the microcontroller?  I
thought there was a way to read the code out of them.  I'll see if
it's possible to dump the code, and if it is, I'll build the circuit
required and send it to you so you can dump it for me, if that's
alright with you.