[sdiy] Identification of 1970's logic parts?

[John Loffink]

Do you realize that Musical Applications of Microprocessors has a block
diagram of the Muse and a description of the circuitry?  This is not a
complete schematic, but does show the basic counter and shift register
blocks to build all the pieces.

The only "S" company I can think of from that era is Signetics.  LSI was not
around then.  But those TR1001 TR1004, etc. part numbers sound like
rebadging to me. 

Any modest logic analyzer ought to let you reverse engineer 90% of the
circuitry.

John Loffink
The Microtonal Synthesis Web Site
http://www.microtonal-synthesis.com
The Wavemakers Synthesizer Web Site
http://www.wavemakers-synth.com


> -----Original Message-----
> From: owner-synth-diy at dropmix.xs4all.nl [mailto:owner-synth-
> diy at dropmix.xs4all.nl] On Behalf Of Monty Brandenberg
> Sent: Thursday, July 08, 2004 7:29 PM
> To: synth-diy at dropmix.xs4all.nl
> Subject: [sdiy] Identification of 1970's logic parts?
> 
> 
> Googling and usenet haven't paid off; maybe someone on the
> list can help me identify some logic parts dating from
> 1970.  I'm doing some reverse engineering on a Triadex
> Muse for documentaiton purposes but it uses a family I've
> never encountered.  Functions appear to be similar to ttl
> (gates, hex inverters, flipflops).  Packages are standard 14-,
> 16-, and 24-pin dip.  Manufacture date is 1970.  Logo is an
> outlined box with small 's' inside (LSI?).  Given loads
> and resister pull-up values, logic can sink quite a bit of
> current.  Power supply is a bit outside of standard ttl
> spec (running about 5.6V).  Some inverters/drivers are
> used to sink current from a separate 3+V supply.  Devices
> I'm trying to track down are:  TR1001, TR1004, TR1005,
> TR1006, TR1007, TR1008, TR1009, TR1010, TR1011, TR1014,
> TR1016, and TR1023.  Might be a private labelling but I'm
> hoping not....
> 
> tnx
> 
> --
> Monty Brandenberg