[sdiy] looking for old DIY articles with RAM projects

[Mike Gorman]

Dan,

I've recently been working through my collection of ETI magazines to find
Electro-Music related articles. I have complete collections of PE and
Elektor, along with virtually complete collections of ETI, Maplin
Electronics, the early years of E&MM and approx 40 years of Wireless World
in my collection - amongst others (I currently have in excess of 6,400
magazines in my collection and counting). 

I'm waiting to see if I will be given permission to scan and put these
articles from ETI and PE on the web in the near future, so let's hope this
will get a positive response soon.

These are what I've found so far in ETI that may be of interest:

There was a Digital Delay Line series of articles from Dec84 to Feb85 that
used static RAM chips (6116 - 2Kx8 chips from memory, pardon the pun :-).

Then there was a Digital Sound Sampler that was actually driven by a ZX
Spectrum but had some quick complex logic for A/D, D/A and sample memory
management - this was a series of 6 articles from Nov85 to Jul86 and again
was 6116 based.

Next was the Digisound 80 Voltage Controlled Digital Oscillator that should
be good for D/A from EPROM's. This was published in Mar85, but should be
available from some of the Digisound resources on the web.

>From a sequencer point of view, there was the 1024 Composer from May81. This
was sold by Powertran as a complete unit as well. This appears to use 2 6514
RAM chips (which are 1Kx4 chips I think).

There were also a number of articles with RAM boards for various early
computers (Atom, Spectrum, Powertran, 6800, 6809, etc.) that would deal with
memory management and decoding, but I didn't capture these details as I was
focusing on Electro Music related articles.

Other articles I can think of are:-
An 128 Note sequencer in Practical Electronics, which I think used 6810 RAM
Chip. 
A Digital Delay Line that Powertran sold - I think the design was published
in E&MM and it used 64k of Dynamic RAM (with possible expansion boards).
I recall some delay projects in Elektor that I think where RAM based.

I'll be working through my Practical Electronics and Elektor magazines in
the near future to build project lists for them as well, so if I come across
any more projects I'll let you know.

If things go according to plan, I will hopefully be uploading scans of these
interesting magazine articles onto the Electro-Music.com forums in the not
too distant future, but if you can't wait, drop me a PM and we can discuss
it.

Regards

Mike Gorman

-----Original Message-----
From: synth-diy-bounces at dropmix.xs4all.nl
[mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of Dan Snazelle
Sent: 22 June 2009 18:33
To: synth-diy at dropmix.xs4all.nl
Subject: [sdiy] looking for old DIY articles with RAM projects


hey there


It seems looking at commercial digital delay schematics has been a dead
end as they are SO complex. So maybe starting small and learning what
does what would help.

SO
someone told me about an old Polyphony article that had a digital delay
schematic. And someone else just told me
there was an article with a 128 (?) step sequencer that used RAM.

I am trying to find these (and any other articles or scheamtics) that might
be simple starting points on  learning to use
RAM, latches, etc.

I would assume at some point that Popular Electronics might have had some
articles or how-to's on this stuff as well.

maybe Elektor too?


If anybody has any info or links or scans, I woud really appreciate it.


many of these can be found on ebay but they rarely include what is IN the
magazine.


thanks

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