[sdiy] Art of electronics computer

[Lanterman, Aaron]

On Jan 8, 2012, at 7:56 PM, Scott Gravenhorst wrote:

>>> the final project in the digital design lab involved making an add-on-board to a 68000-based computer board 
>>> thingy. We had to have it drive D/A converters hooked to an  oscilloscope to make a raster character display.
>>> 
>> Wow.  I did this exact thing - raster character display using a MC6800 (6800, not 68000) and a 555 timer in my own PLL circuit that muxed the bits from a parallel port to the Z axis of the scope

> Oh wait - not exactly the same.  I used the horizontal and vertical sweeps of the
> scope synched to my circuit...

I can't remember now if the exact approach was specified - it might have been just "get this thing to display characters on the scope." Syncing with the scope's "natural sweeps" may be a smarter solution that what we tried. ;)

- Aaron