1 May
2020
1 May
'20
10:47 a.m.
On May 1, 2020, at 1:32 PM, Tony Duell via cctalk
<cctalk at classiccmp.org> wrote:
On Fri, May 1, 2020 at 6:20 PM Hugh Pyle <hpyle at cabezal.com> wrote:
I suppose things get really confusing when dealing with 6 row tape
(https://www.smecc.org/teletypes_in_typesetting.htm)
paul
Tony, maybe your collection can help me answer a puzzle: which side is "top"?
By my reading, for 8-level tape,
- ANSI and other US standards have three data bits / index / then five data bits
- ECMA has five/index/three... :)
https://twitter.com/33asr/status/1138758004747177984
As far as I know the 5-hole side is always the most significant 5
bits, the 3 hole side the least significant 3 bits. In other words the
holes go :
76543S210
Where S is the sprocket hole and a digit is the bit number (bit 0 is
the least significant bit).
As to which way use the tape, with the tape feeding towards you, the
sprocket hole is normally offset towards the right, that is the bits
would read with the MSB on the left. I am not sure if that is
universal though
-tony