Datasheet or info for Fairchild uA3656D? - test-drb@ccmp.vtda.org

19 May 2005

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Subject: Re: Datasheet or info for Fairchild uA3656D?
   From: "Joe R." <rigdonj at cfl.rr.com>
   Date: Thu, 19 May 2005 17:26:49 -0400
     To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at
classiccmp.org>

 My Databooks and drawings from when I was
designing with the beastie
says with +5 Vcc and -9Vdd all IO will be TTL compatable.

FYI back in that time frame Signetics, Intel and Fairchild had a 
DTL/TTL product in the 3xxx class numbering.  For example:

 3205 similar to 74138 may be differnt pinout
 3009 similar to 7432
 9602  onshot similar to 74123 however the 9602 was truly a better part.
 3404  8bit wide latch maybe similar to 74100 or 74373 
  Correct but I still haven't found any Fairchild 36xx part numbers so I'm
still not sure what these two parts are.  Fairchild did build some memory,
the ram was PN 3530 (I THINK!).

 1101 256x1 Pmos (two voltages) and really slow (1.5us parts were the 
 fast ones)

There were others but those appear on my drawing and those of the
MCS-8. 
    Are you sure you're not thinking of the Sim-8? That's what's shown in
the 8008 manual. If you have other drawings I'd like to get a copy.

The MCS-8 manual has the SIM-8 in it.  The other two designs are mine
and on B sized blue line (they are ca1973ish). They used more contemporary
7400 stuff save for the 3205 (intel 8205 in 1980s or better 74LS138 which 
all the same thing.).  Nothing to wild, 2102 ram instead of 1101 and the 
IO was a series of ports that drove a Burroughs Panaplex 32 char display
and a numeris and function keyboard. The application was serial frame 
time encoding/decoding for 8Track commercial tape systems.  Copying the 
drawing would be a pita being B sized and very little per page (near 
20 pages of drawings).

I keep wanting to build a 8008 system as I have a chip using current
(ca 1980s) parts for laughs. The problem is an 8048 can blow it's 
doors off. 

Allison