Here's another "home built" computer. It's built out of 74XX series TTL.
:) You can actually login to this one.
http://www.homebrewcpu.com/
Paul G. Allen wrote:
Tracy R Reed wrote:
Amazing. I need to read up on how this stuff works and educate myself
a bit more. I would love to have a modern art piece like the relay
computer in that first link on my wall.
When I worked for Loral at the FASWP base (part of the old Naval
Training Center that has been closed for years and re-developed), the
fleet trainer I worked on was a mainly mixture of Relay Transistor
Logic (RTL), Diode Transistor Logic (DTL), Resistor Transistor Logic
(RTL), and some discrete Transistor Transistor Logic (TTL). There were
some tube circuits as well, but not too many (They generate too much
heat and take too much power to have been feasible in such a system.)
It was three stories of rack upon rack of cards full of relays, old
transistors, and diodes (not counting the power supplies to power it
all). Noisy as hell and broken all the time. It was used to train
carrier groups on coordinated sub hunting techniques. A huge computer
that could easily be replaced by a very low-end PC. Back when it was
built - in the '50s or '60s IIRC - it was a high-end computer.
Relay logic is not any more difficult than logic based upon ICs. It's
all based upon ones and zeros, on and off. The power requirements are
much greater, there's a *bit* of a size difference, and the noise
level is just a *bit* higher. :o
PGA
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