Walsh Functions

[Scott Gravenhorst]

Good points.  I have rethought the use of a 6800 and after a little speed
math vs the code I would write, I could maybe get 5 bits out of it.  So
that poor little machine gets to sit idle.  I have a 486-33 that I am
not using (even has a MIDI card).  problem would be outputting
the bits.  LPT port?  I could do 8 that way, which is already divide by 256.
I could also feed a VCO into the strobe to interrupt the CPU each VCO 
cycle.  I really wanted to put some stuff to use that I have lying around.

Maybe Mr. 6800 can control a TOG synth.  I have 2 MK50240s.

Gene Zumchak <zumchak at cerg.com> wrote:
>Terry recommends jumping up to the HC11 for a processor.  This is about ten or
>more years old and Motorola is trying to phase them out.  I'd jump a little higher
>to the HC12.
>The MC68HC812A4 has 4K of on-board EEPROM, 16-bit bus, narrow or wide expansion to
>4M of program.  Two UART channels.  (One for monitor, one for MIDI?)
>An A/D, 1K of RAM, all kinds of I/O.  It runs at 16MHz (8MHz bus).
>
>Gene Z.
>
>
>
>KA4HJH wrote:
>
>> >Using a micro to do all the maths sounds like fun.  Especially the 6800.  Why
>> >not try the more modern, and more powerful, 6809?  Doing the maths might be
>> >slightly easier as it can do simple 16-bit maths directly, and has two 16-bit
>> >index registers, gobs loads more indexing modes, etc etc.  If you're going
>> >to be
>> >triggering off a VCO and if you're going to be using a reasonable number of
>> >Walsh terms, eg. 31 (so the VCO is running 5 octaves up), you'll need to
>> >do the
>> >maths pretty quickly.  Still, should be interesting!!!!!
>>
>> The 6809 is still around but pretty much obsolete (great in its time but
>> try and find a development system now). Jump up to the 68HC11. 16 bit
>> registers, multiply and divide commands (may be missing a couple of the
>> fancy addressing modes but I can manage). Processor cards/development
>> systems are cheap and readilly available. See the adds in Circuit Cellar
>> Ink. A very popular processor and an easy transition from the 6502/6800.
>>
>> BTW, I heard there's a company that makes 300MHz 6502's...or something like
>> that. EEYOW...
>>
>> Terry Bowman, KA4HJH
>> "The Mac Doctor"
>
>

-- Scott Gravenhorst
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