6502 nixie project
Gordon JC Pearce
gordonjcp at gjcp.net
Sat Dec 3 04:20:12 CST 2005
> Ryan K. Brooks wrote:
>> This has been occupying my time lately:
>> It's my homebrew 6502-powered Nixie clock. Designed it from scratch;
>> thought the other "classic computer" people here might enjoy the write
> 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.
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