[sdiy] Art of electronics computer

[Scott Gravenhorst]

music.maker at gte.net wrote:
>
>"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).
>

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

My bad.  But it did work nicely nonetheless


-- ScottG
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