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Re: [Fwd: starship-design: HIGHLY OPTIMIZED TOLERANCE]

In a message dated 3/23/00 7:10:59 AM Pacific Standard Time, 
lparker@cacaphony.net writes:

> On the reuse topic, you should look inside an electronic typewriter. The
>  "cpu" is an Z80!
>  Lee
Since the CPU chip used in the first PC's, was one of the many parallel 
processing chips of the early super computers. All CPU chips today still 
contain the lead input/output pins for connecting in series or parallel with 
other chips. In one case I used a Novel network board connected to these 
lead-in pins and wired many (100) used complete XT (Z-80 chip if my memory 
serves) and AT CPU's in parallel. It worked well and passed the "smoke test" 
:=). As used and new 386, 486 and pentium CPUs became available the CPU's 
were changed out.

To get the larger capability it was common to first connect four together and 
then cover with epoxy into one larger chip. As faster speed could be obtained 
by reducing the "wire" or circuit length new bigger integrated circuts(IC's) 
with the same internal circuity were fashioned reusing the same schematic 
diagrams. Other chip functions were added as needed. 

In my case I did not bother with epoxy or new IC manufacture and used the 
complete CPU case and insides without a monitor or keyboard. Size was not an 
issue as the racks for 6 hard drives, larger power supply fit nicely with the 
CPU's on bakery bread racks making a single unit with 12 CPU's, 72 hard 
drives, and 12 power supplies.

To build a new computer one need not spend great amounts on new schematics or 
tooling to create new integrated circuits. Most hobbyist and experimenters 
combine IC's by using the mentioned pin connectors to obtain the needed 
functions to get first to market.

Many software writers also save lots of money and time by reusing existing 
Research and development costs need not prohibit anyone from building new 
devices suitable for marketing.

I recommend to those who seek investors instead invest some time looking into 
used technology parts to provide the lion's share of the machine they 
envision as their invention and not try and reinvent the wheel.

Best regards,