CUBIX/6809 updates

[woodelf]

Gooijen, Henk wrote:

>Using the pdp8/e design fron panel for the 6809 is possible, but ...
>there are only 15 Address LEDs (12 plus 3 for EMA), and the other row is
>12 LEDs, so the upper 4 would not be used. The rotary knob could be used
>to display A or B (or DP or CC) but to display X, Y, U, SP, PC you need
>16 LEDs. There are just 12 switches, and you could use the SW switch as
>the 13th, but still, to enter a 16-bit address would be cumbersome.
>So, the pdp8/e panel is not the best choice, but the implementation
>-hardware wise- is always possible. Software is what makes it 'tick' :-)
>and I am sure that's "piece of cake" for you, Dave.
>  
>
As you all know by now  I am building a 9/18 bit cpu. My front panel 
will be limited to
9 data switches and a address page switch. This lets me access 000.nnn 
and 777.nnn
memory on address load. Since I plan only to use  the swr for short 
programs on page zero
and have a bootstrap rom  and I/O on the last page this more than ample 
for me.
A similar restricted front panel may be possible as well for the 6809 as 
data is byte orientated.
Ben alias woodelf