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On Tue, 4 Dec 2007 23:27:19 -0500, "Eisboch" wrote:


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On Tue, 4 Dec 2007 17:09:22 -0500, "D.Duck" wrote:

The IBM 350 disk system stored 5 million 8-bit (7-bits plus 1 odd parity
bit) characters (about 4.4 MB).

http://en.wikipedia.org/wiki/IBM_305


Somebody needs to fix the Wiki.
It was 7 bits (remember the "odd parity"?)
The bits are 1, 2, 4, 6, A, B and parity.
It goes with "7 track tape" etc.

The most popular military teletype machines (Mod 28 ASR33) were 7 bit
ASCI
with an 8th parity or "stop" bit.

Eisboch

Eisboch


This wasn't ASCII, it was Binary Coded Decimal. The problem with even
parity is a "blank" is even. All IBM machines used some varient of BCD
before the 360 and "hex"
That was a typo above bits are 1, 2, 4, 8, A, B parity.

Maybe you're right ... it's been a long time. I seem to remember though
being taught that the military teletype machines that I worked on were 100
wpm (or maybe it was 110 wpm), 8 bit ASCII. Several machines would be
running in the radio shack copying several channels of an multiplexed fleet
broadcast.

I used to have a manual that I "borrowed" but I haven't seen it in years. I
*do* have a little card that the Navy awarded you when you graduated from
the school in Norfolk. It has your name, date, and confers the title of
"Doctor of Teletype Technology". :-)

I am probably wrong, but that's what I remember.

Eisboch