[sdiy] Walsh Functions/EN S-008

[Dave Brown]

I have all those early issues of Byte and built my first computer in 1977.
It was a great time and computers is what pulled me away from electronic
music.  I didn't come back to electronic music for about the next 15 - 20
years.  My computer was a rack built around the 8080 processor board, RS-232
board, and power supply of a Tektronix 4025 terminal.  They were heavily
modified.  I designed a parallel board to interface with a printing
calculator for a 40 column printer and paper tape reader, a modem card for
my Tek 4010 graphics terminal, and a 48 kbyte dram card.  I ran this way for
a while but eventually added a dual cassette interface.  My next upgrade was
the Heathkit dot matrix printer.  At this point I was tired of designing and
building each and every card so I designed a bus expander from the 8080
processor to the S100 bus and added an S100 bus card slot.  In that I added
a dual floppy disk interface and video card so I could run alpha on the
video and graphics on the 4010.  At that point I expanded to CP/M for the OS
and ran that way for the next 10 years.  I found out that few of the S100
cards were well designed and I had enough mods on them to improve them that
I should have just built the card myself.  I only have one photo of my early
computer before the expansion to the S100 bus and it is on my site at
http://modularsynthesis.com/tek/index.htm

It was a fun time.

Dave

> -----Original Message-----
> From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On Behalf Of
> David G Dixon
> Sent: Thursday, September 21, 2017 12:47 AM
> To: 'Ben Bradley'; 'SDIY'
> Subject: Re: [sdiy] Walsh Functions/EN S-008
> 
> I just perused that 1977 Byte issue.  Man, that was a great time to be an
> electronics hobbyist -- Heathkit!! -- but that computer stuff was pretty
> expensive.  That magazine is like a rabbit hole that you could just keep
falling
> into, deeper and deeper.  If I hadn't been so scared of electronics when I
was
> a teenager (it seemed as if only geniuses need apply), I might have had a
> different career than I ultimately had (in metallurgy).
> 
> 
> > -----Original Message-----
> > From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On Behalf Of
> > Ben Bradley
> > Sent: Wednesday, September 20, 2017 8:02 PM
> > To: SDIY
> > Subject: Re: [sdiy] Walsh Functions/EN S-008
> >
> > That article is surely from Byte Magazine September 1977, downloadable
> > here:
> > https://archive.org/details/byte-magazine-1977-09
> >
> >
> > On Wed, Sep 20, 2017 at 7:42 PM, BrightBoy <jdec at mindspring.com>
> > wrote:
> > > There's also an article on Walsh Functions in the BYTE Book of
> > > Computer Music compendium book.
> > >
> > > Jeff
> > >
> > > -----Original Message-----
> > >>From: Neil Johnson <neil.johnson71 at gmail.com>
> > >>Sent: Sep 20, 2017 7:33 PM
> > >>To: "synth-diy at synth-diy.org" <synth-diy at synth-diy.org>
> > >>Cc: Bernard Arthur Hutchins Jr <bah13 at cornell.edu>
> > >>Subject: Re: [sdiy] Walsh Functions/EN S-008
> > >>
> > >>I found a copy of Motorola Application Note AN-315 from 1974 in my
> > >>files that shows how to synthesize a sine wave using Walsh
> > functions.
> > >>A bit vintage and there are plenty of other documents
> > showing how to
> > >>do this but interesting nonetheless.
> > >>
> > >>Neil
> > >>--
> > >>http://www.njohnson.co.uk
> > >>_______________________________________________
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