Wang 300 Calc

[Paul Heller]

On Sep 5, 2007, at 4:10 PM, Brent Hilpert wrote:
>
> I received two orphan 320K keyboard/display units a few years ago  
> (no logic unit).
> Hobbled up a little level-shifting hardware and wrote some  
> calculator code to
> drive them from a SWTPC 6800 - in other words the 6800 was  
> replacing the
> missing logic unit. Worked fine but the next (intended) step was to  
> redo it
> all in a microcontroller and stuff it inside the 320K case so it  
> would be a
> stand-alone 'modern' nixie desktop calculator. Would be kinda nice  
> because the
> 320K KDUs have a small footprint compared to other nixie desktop  
> calcs. There
> is very little spare room in the case however. I think I  
> anticipated it would be
> feasible if one used an external wal-wart (ugly) for the power  
> transformer.
> The KDUs are very well built: cast aluminum case, micro-switches  
> for the keys...

Cool idea. Did you find the hardware interface documented somewhere,  
or did you reverse engineer it somehow? Was it something standard  
like RS-232?