7 Aug
2008
7 Aug
'08
5:39 p.m.
bfranchuk at jetnet.ab.ca wrote:
Did the 28 TTY have a paper tape reader/punch like 33?
The 28 was more modular than the 33. The reader and punch were options.
The biggest drawback to the 28 was that it used a 5-level code (but NOT
Baudot code), so there were fewer symbols and you had to use the letters
and figures shifts.
The oldest code I've written for which I still have source is a driver
for the 28 for the little-known Apex operating system. The system
natively used ASCII, so the driver did the translation, and characters
that weren't available were represented using overstrikes (like many APL
operators). The 28 didn't have a backspace, so the driver kept track of
all the overstrikes needed on the line and did a second pass if necessary.
http://www.brouhaha.com/~eric/software/ttyhan/