Joseph Gwinn wrote:
In article ,
Rich Grise wrote:

Jon Elson wrote:
Not too many computers anymore where you can key in the bootstrap loader
program through the front panel switches.

Bootstrap loader? I had to toggle in the whole freakin' program through the
switches and pushbuttons that weren't even _debounced_!
(Scelbi 8H, 8008, mine had 256 bytes of RAM)

Wuss!

We programmed the bootloader by soldering diodes in a matrix on a
circuit board. Diode present meant a one, diode absent meant a zero.
This was the PROM of the day (SEL 32 computer, early 1970s)


Joe Gwinn


Interdata 7/32 machines we used for flight sims (way back mumble years ago).

But bias power had to be supplied - in correct sequence.


--

Richard Lamb
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web site: http://www.home.earthlink.net/~cavelamb