On 4/21/06, a.carlini at
ntlworld.com <a.carlini at ntlworld.com> wrote:
Jay West wrote:
However, I think you're missing the basic
concept here. The IBM coax
terminals do not speak ascii, nor do they speak RS232. Nor are they
character based like ANY and EVERY terminal you've probably delt with
before. The electrical spec isn't similar to RS232 but current
loop...
I know next to nothing about the M3134. It implements enough to
allow you to hook a 3270-speaking terminal to a DECserver 550.
I, too, know little about the M3134 (but I used to manufacture IBM
protocol emulators for HASP, 3780 and SNA, including 3270
emulators)... about all I _do_ know about the M3134 is that the output
physical layer is some form of coax. If that doesn't directly connect
a 3270-type terminal, I can't imagine what it's for. I've only ever
plugged genuine IBM 3270 terminals into a 3274, and a 3274 into a 4331
(mid 1980s, for those at home keeping score).
Now... from an application standpoint, it would be helpful if the
M3134 did some protocol massaging (ASCII<->EBCDIC, 3270 to
stream-of-bytes,etc), but I don't know what it really does.
-ethan