18 Jul
2014
18 Jul
'14
4:43 p.m.
On 18 Jul 2014, at 20:45 , Chuck McManis <chuck.mcmanis at gmail.com> wrote:
So you could put one, two, or even a
hundred DEL characters at the end of the line and it wouldn't matter
semantically.. So those DEL characters became a way of providing a safe
'delay' that would allow a machine without any flow control to accurately
read in the paper tape.
I'm pretty sure that some of the 8-bit microcomputer systems used NULs for this exact
purpose, when loading data through the serial port; specifically, I think I heard about
NUL padding for the UK-101 and KIM-1.
18 Jul
18 Jul
5:22 p.m.
On Jul 18, 2014, at 1:43 PM, Raymond Wiker <rwiker at gmail.com> wrote:
I'm pretty sure that some of the 8-bit
microcomputer systems used NULs for this exact purpose, when loading data through the
serial port; specifically, I think I heard about NUL padding for the UK-101 and KIM-1.
I can confirm null padding on the UK101 (and probably the OSI Superboard II and relatives)
for tape saving. When loading a tape, the machine basically redirects input from the tape
and acts like the user is typing in the program. When enter is pressed, the machine needs
a few cycles to tokenize the line of BASIC, so a few NULLs are saved to the tape between
lines.
Ian
5:34 p.m.
On Jul 18, 2014, at 14:22 , Ian McLaughlin <ian at platinum.net> wrote:
I can confirm null padding on the UK101 (and probably
the OSI Superboard II and relatives) for tape saving. When loading a tape, the machine
basically redirects input from the tape and acts like the user is typing in the program.
When enter is pressed, the machine needs a few cycles to tokenize the line of BASIC, so a
few NULLs are saved to the tape between lines.
I think I should make my planned utility pretty flexible about what it can digest and
output for line ending and padding sequences, then. I'm beginning to construct a
mental image of what its internals should look like, and these examples of what various
systems like to see are helpful.
--
Mark J. Blair, NF6X <nf6x at nf6x.net>
http://www.nf6x.net/
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