6502 nixie project

[Gordon JC Pearce]

woodelf wrote:
> Ryan K. Brooks wrote:
> 
>> This has been occupying my time lately:
>>
>> http://www.hack.net/nixie
>>
>> It's my homebrew 6502-powered Nixie clock.  Designed it from scratch;  
>> thought the other "classic computer" people here might enjoy the write 
>> up.
>>
> Nice clock.  Forget the tiny buzzer , you want a real alarm, at least a 
> 3 inch bell!
> Well if you got the extra memory a nice female wake up voice would be 
> handy. :)

 From the article:
3 - Alarm annucator   (future: is 4k or so enough for a small sample?)

Possibly.  A very small sample, though...  Some old Simmons drum synths 
used an EPROM containing a sampled drum hit for each channel.  Mostly 
they used 2764 or 27128 EPROMS, although the bass drum sample in mine is 
on a 2732.  Playback was by means of a counter (change the counter clock 
to change the pitch) and a D-A converter on the data lines.

It depends on the sample rate you want - for approximately telephone 
quality you need about an 8kHz sample rate, which would give you about 
half a second in 4k.

Gordon.