Front panel switches - what did they do?
spc at conman.org
Tue May 24 13:07:03 CDT 2016
It was thus said that the Great Swift Griggs once stated:
> On Tue, 24 May 2016, william degnan wrote:
> > Here's a power point pres I did at VCF-E4, this will get you started.
> > Using Altair 680b front panel in basic terms is covered a few slides in.
> > http://vintagecomputer.net/vcf4/How_to_Session/
> There are some nice clean photos in that presentation. So, it was binary
> with some hexadecimal addressing. I like the slide entitled "How to test
> Machine Language Using a Program Listing Using Toggle Switches". That's
> pretty hard core. I'm surprised they didn't at least use component
> displays with LEDs to show the values rather than reading it straight off
> some blinkenlights. Maybe those weren't around yet or were too expensive.
Work with binary, octal and/or hexadecimal enough, and you'll learn how to
sight read binary patterns. The conversion is pretty simple:
- - - 0 - - - - 0
- - * 1 - - - * 1
- * - 2 - - * - 2
- * * 3 - - * * 3
* - - 4 - * - - 4
* - * 5 - * - * 5
* * - 6 - * * - 6
* * * 7 - * * * 7
* - - - 8
* - - * 9
* - * - A (or 10)
* - * * B ( 11)
* * - - C ( 12)
* * - * D ( 13)
* * * - E ( 14)
* * * * F ( 15)
So a byte value of
* - - * - * * -
is hexadecimal 96. On Octal, it wold be 226.
-spc (I'll leave he decimal value to the reader)
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