10 Nov
2003
10 Nov
'03
4:50 p.m.
Pete Turnbull <pete(a)dunnington.u-net.com> wrote:
All the lines have two spaces between the line number
and the code.
All, that is, except for a few that have an '@' in place of the second
space. Is that significant (does it mean "ignore this" or something?)
or is it just an artifact of a noisy Teletype line? (The listing
Noisy line, most likely. I don't think it has any significance.
What does '14 in a PRINT statement, in front of
a quoted string, mean
(eg in PRINT '14"SULU")? I wondered if it were something like PRINT
TAB(14)"... but there are TAB()s elsewhere. A control character,
perhaps? If cursor or screen control, are they octal or decimal (I'd
guess decimal) and is there a table anywhere?
The leading single quote outside double quotes is how HP BASIC (2000
and 3000) represent a non-printable character in a string constant.
So '14 is decimal 14 as a character, or control-N.
On an HP 262x or 264x terminal this would be done to switch away from
an alternate character set (which would be switched to by control-O or
'15 and selected by an escape sequence '27"(" followed by "@"
for the
base set, "A" for the math set, and "B" for the line drawing set).
What exactly do the first two parameters to the ENTER
command do? They
always seem to have three variables (eg ENTER T2,T,X$).
I don't recall the details clearly, I'm thinking one is a limit in
seconds on the time the user has to reply, and I'm thinking the other
is used to return the time it took the user to enter the reply.
-Frank McConnell