FPGA VAX update, now DIY TTL computers

[woodelf]

Allison wrote:

>74LS10 dip .25 at ea .17 at Q25 |74F10 dip .19 at ea .14 at Q25 |74HCT10 dip .25 at ea .18 at Q25
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>JDRmicrodevices
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>
I plan to get then from unicorn electronics, about  the same pricing.
 

>Even at a buck a chip if your only using 36 of them thats not painful.
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The  quick logic alu design is  about 20 TTL per bit and
I am  planning 18 bits wide...    say 50  ents each for a 74XX gate that 
is $10 per bit.
Rounding that to 20 bits that  is $200 for the logic.  Good sockets are 
$.50 so
about $200.  Not knowing  PCB layout say  a square inch per chip ... 20 
sq inches
@  75 cents a inch  ... $300 for the PCB's ...   That is where my money 
is going.
OH  well I  have all next year for that project, but I have two goals 
for the ALU
and Control so I can have feel for what the 60's  Computers were like 
size wise.
1) 14 pin DIPS.  2) 7400 logic.

>
>Allison
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I can get  a  200 watt PC power supply  ... 5 volts @ 20 amps  that I 
hope is
ample ...
PS.  As for getting  7400 off  scrap boards, if I had the scrap boards I 
would
most likely try to get the scrap item working again. :D