How many computers?

From: dave dameron <>
Date: Tue Jul 14 15:40:16 1998

At 06:41 PM 7/14/98 GMT, you wrote:
>> I was just wondering, how many computers do all you have out there???

Not many, 10 to 20, and some I don't know if to count, such as
pc boards with a 6802, 2716, and 2 6821 ic's. I think they came from a cash
register system. Others like XT motherboards...
1. Mixed brand S-100 System. Either Flashwriter display or serial to Heatkit
H19 terminal. Extra crate and misc cards.
2. Various PC clones. I am using a 386 now. No Pentiums or higher.
3. A few Z-80 test computers. 8 or so ic's on a single board.
4. 80188 board computer for "Radio Electronics" Robot.
5. Homebrew game of "life" computer. (1973)
6. Calculator built from neon bulb "shift register counters". Input is a
rotary telephone dial. I think subtraction was "1's complements". (about 1968)

Interesting peripherals from late 1970's when I was going a lot.
1. SWTP CT-1024 modified for 64 columns and graphics. Hope to get this
working again with some computer.
2. Sylvanhills flat bed plotter. Used DC motors and opto-interruptor wheels
which I replaced with stepper motors.
3. Stepper motor 3 axis wax carver. Used cylindrical coordinates. The wax block
rotated on a turntable.

Literature, including
First 7 years of Byte.
First few years of Dr. Dobbs, the bound volumes, I didn't keep the
individual issues.
2 of the Creative Computer games books.
10 issues of "Computer Hobbyist", I have just found the remaining issues.
Documentation for Scelbi 8H and other 8008 stuff.
Other construction type books.

Various parts, including a box of RTL ic's, 1101 memory's.
There apparently was an ad in 1967 "CQ" for an RTL computer.

>> DIGI-COMP 1 (an educational toy from 1963)
>Way cool. I had access to one in high school, to play with, but I never
>owned one. I've written to Edmund Scientific. They get the occasional
>letter inquiring about the DigiComp 1, but so far, not enough interest
>to resurrect the product.

Yes, it would be fun to find things like this. I still have the 3 potentiometer
"analog" computer I built for some science fair. The Digicomp I cost $5.95
in 1969 from Edmund Sci. Others were various mechanical (Dr. Nim) and
electronic NIM players, Computers like "Brainac", and later in 1971, a
National Radio Institute computer
using 53 TTL ic's. Have seen only ad's. A RCA projects book I have has a
"slot machine" built from individual transistors for flip flops, gates,
multivibrators, etc. It "computed" the score, so was a calculator of sorts.

Speaking of books,
has anyone seen the book "We Built our own Computers" by A.B. Holt,
Cambridge Univ. Press, published about 1966.
Received on Tue Jul 14 1998 - 15:40:16 BST

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