29 Dec
2005
29 Dec
'05
1:35 p.m.
On Thursday 29 December 2005 04:32 pm, woodelf wrote:
Tony Duell wrote:
First ever "hands on" computer for me was a Heathkit H11 system that I got to
build. The "terminal" for it was a Decwriter, which used current loop, if
I'm remembering right.
--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, a critter that can
be killed but can't be tamed. --Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin
[1] Note for the uninitiated. The IBM serial card
has 2 odd features that
were not present in most, if not all, clones. The first is that it can
pull pin B8 (IIRS) low during I/O reads, needed if the card is used in
slot 8 of the IBM PC/XT. The second is that it has a current loop
interface as well as RS232 .
Does any of the newer serial cards have the current loop option?
Was it only TTY's that used the current loop?