[sdiy] Art of electronics computer

[Scott Gravenhorst]

"Lanterman, Aaron" <lanterma at ece.gatech.edu> wrote:
>
>On Jan 8, 2012, at 3:44 PM, dan snazelle wrote:
>
>> Id also need a few weird logic chips and a keypad. But i think 
>id learn a lot. Especially if i built the entire lab computer 
>with the 68008 and did the chapters on assembly. 
>
>That's a blast from the past... when I was a senior at Wash U - 
>uhm, 1992 or 1993 - 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.
>
>Alas, my team never got ours fully working, but I don't think 
>anyone else did either IIRC. ;) 

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.  It worked quite
well actually - on an Eico 460 scope  (that's 460 kilohertz).

(c:

-- ScottG
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