26 Mar
2021
26 Mar
'21
7:33 p.m.
The document refers to 8 bit (7+P+F) and 7 bit (6+P+F) using the same
width, 25.4mm, for ECMA-10.
From the docs that have been linked, whirlwind tape was
7 bit, but not
EIA-RS-227 or ECMA-10 compliant, but easily re-created by trimming a
data
bits width from normal 8 level tape. (LSB should be trimmed, not MSB, I
think)
I have a teletype BRPE which supported a 7 level tape format, but I do not
know if it was ECMA-10 or whirlwind style, but it may be buried in the docs
available online.
-Eric
On Fri, Mar 26, 2021, 8:10 PM Ron Pool via cctalk <cctalk at classiccmp.org>
wrote:
On 3/26/21, 8:41 PM, "cctalk on behalf of Paul
Koning via cctalk" <
cctalk-bounces at classiccmp.org on behalf of cctalk at classiccmp.org> wrote:
I can't find right now the drawings that show
all the 5..8 channel tape
layouts and dimensions, but I did see a
number of references that speak of 7/8th inch
tape for 7 channel
layout. (Also 11/16 for the 5-channel case)
ECMA-10 defines some of the common punched tape layouts and includes
dimensions and other requirements.
I'm not sure if this is the document that Paul is referring to.
https://www.polyomino.org.uk/computer/ECMA-10/