1 |
On 2018-05-22, Grant Taylor <gtaylor@×××××××××××××××××××××.net> wrote: |
2 |
|
3 |
> Aside: Now my brain is trying to remember the old differences between |
4 |
> telnet and 3270 / 5250. I think that telnet was inherently line |
5 |
> oriented (by default) and 3270 / 5250 were something else (but I don't |
6 |
> remember what). |
7 |
|
8 |
The 3270 was completely screen-oriented. An entire screen was loaded |
9 |
from the host. That screen included fields with various attributes |
10 |
(e.g. editable vs. read-only). You could edit whatever was editable |
11 |
on the screen, and then when you hit "submit" the entire screen was |
12 |
sent to the host (there may have been an option to send only edited or |
13 |
editable fields, I don't remember the details). IOW, it worked |
14 |
vaguely like an HTML page containing a form. Except there were |
15 |
various entertaining ways things went wrong that don't happen with an |
16 |
HTML form. IIRC, if you inserted too much data into an improperly |
17 |
defined field, it could shift everything below it and muck up all the |
18 |
rest of the fields. I also seem to recall sometimes being able to |
19 |
edit fields that weren't really supposed to be editable, and then |
20 |
hilarity ensued when you hit submit. |
21 |
|
22 |
Though I did actually use some genuine IBM green-screen "3270-like" |
23 |
terminals, most of my experience was with 3270 emulators running under |
24 |
X11 -- so some of the fun was probably caused by bugs in the |
25 |
emulators. |
26 |
|
27 |
-- |
28 |
Grant Edwards grant.b.edwards Yow! I'm shaving!! |
29 |
at I'M SHAVING!! |
30 |
gmail.com |