19 Nov
2005
19 Nov
'05
7:28 a.m.
There are 4 parity states.
Mark parity = always punched
Space parity = never punched
Odd & even = punching based on other 7 bits of data
and None = all 8 bits are data.
Bob
On Sat, 19 Nov 2005 09:50:58 -0500, Barry Watzman wrote:
I have a chart of paper tape hole patterns for all 128
characters, and it
shows the LSB (bit zero, although the chart numbers them 1-8) as the edge
hole on the 3-hole side, with the bits in order 0 to 7 (or 1 to 8).
However, one question, this chart shows the high-order
bit (parity bit)
punched for every character, no exceptions. Was that a standard convention
in sending ascii files to paper tape?