New subject: Triumph Adler Alphatronic PC questions

1 Nov 2001

From: Ben Franchuk &lt;bfranchuk(a)jetnet.ab.ca&gt;

...
 If the 74289's are the non inverting 16x4 rams I
would use them. I plan
to use 74ls382's (the ripple carry alu's). 

The 74289 is also the same part/pinout save for instead of open collector
they are
tristate outputs.

The 74382 is not an ALU, it's a carry look ahead generator.  The 74381 is an
ALU.

...
 Can't do that for three reasons
1) I am use a 16 x 12 ram ( 3 chips ) on two boards for a 8 x 24
register array. 

Not enough reason there, so you dont use the full byte width.

...
 2) I am using the 486 cache chips as main memory in my
FPGA prototype
32k x 12 bits.:) 

So the cache rams are easy enough to find more.

...
 3) This was a TTL design on paper of what a computer
designed in the
early 1980's could have been like. That rules out  2901 bit slices. 

BZZZT!!!  By ealy 1980 the 2901 was already passe', as were TTL cpus.
I presume by that you really meant early (very early) 1970s as the 2901
is a 1970s part.

Also the 2901 is directly traceable to 74181, 74189 like parts.

...
 configuration. Mind you a
larger TTL CPU with lights and switches is more impressive. If you like
lights 

I already have a real PDP-8. ;)

Allison

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