Re: Software advice

In article <dqu47i$kng$1@xxxxxxxxxxxxxxxx>,
Keith F. Lynch <kfl@xxxxxxxxxxxxxx> wrote:
>Wilson Heydt <whheydt@xxxxxxxxxxx> wrote:
>> Mod I
>> 20usec cycle
>
>Or in modern terms, 0.05 MHz. Or 0.00005 Ghz.
>
>> addition by lookup
>
>In other words, they were even slower than the above numbers would
>imply, as they did less per cycle.
>
>> Modified Model E
>> console typer
>
>Was that something like a Teletype? A Flexowriter? Something else?
>What was the character code?

It's an IBM Electric Typewriter Model E. moving carriage...type bars....
Main modification was for handling continuous, tractor feed paper. Wierdest damned thing
you ever saw.

The character set would have been that of the IBM 1620. Each addressable core loc had 6
bits: Check, Flag, 8, 4, 2, 1. Alpha characters took two digits. Check bits were for
parity. Flag bit was settable and used for things like field delimiters and indirect
addressing. Op codes were 2 digits. Addresses were 5 digits. Most instructions took
12 digits: OP A-addr B-addr.

I *think* I may still have a manual around on the 1602...but, if so, it's pretty well
buried.

--
Hal Heydt
Albany, CA

My dime, my opinions.
.

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