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- Path: sparky!uunet!think.com!ames!agate!ucbvax!lrw.com!leichter
- From: leichter@lrw.com (Jerry Leichter)
- Newsgroups: comp.os.vms
- Subject: RE: what the heck is it?
- Message-ID: <9211142231.AA06938@uu3.psi.com>
- Date: 14 Nov 92 21:18:51 GMT
- Sender: daemon@ucbvax.BERKELEY.EDU
- Distribution: world
- Organization: The Internet
- Lines: 53
-
-
- Can anyone tell me what the TEK4125 graphics window is for? How is it
- used? What are its capabilities? Where can a manual be obtained? No
- one around here seems to know anything about it.
-
- The TEK in TEK4125 stands for Tektronix, known for their electronic measuring
- instruments. They also make graphics terminals - in fact, they were among
- the first manufacturers of the things, and their protocols became something of
- a standard. Years ago - around 20 - they made a terminal called a 4014; the
- "TEK4014" interface, a very simple one, since it had to be implementable using
- the hardwired SSI (small scale integration) of that era - was probably the
- most widely accepted graphics output protocol for a very long time. Every
- major graphics package produced TEK4014-style output, at least as an option.
- (The other major option was usually Calcomp pen-plotter compatible.)
-
- When DEC produced the VT240 graphics terminal (early 1980's), it included
- TEK4014 emulation as one option. (The other option was ReGIS, a very
- different and much more sophisticated protocol that DEC invented. It has
- never caught on outside the DEC world.) VWS, the original DEC windowing
- package for VAXstations, also included a TEK4014 emulator.
-
- TEK4014 mode has two main advantages: It is VERY simple to emulate; and it
- is used by many software packages.
-
- The TEK4125 was a much later Tektronix graphics terminal. Hardware had
- gotten much more sophisticated over the years, as had users' graphics
- requirements. The TEK4125, like many other Tektronix terminals over the
- years, had more sophisticated graphics interfaces that 4014 emulation, though
- they continued to support it. The 4125 was at the high end of Tektronix's
- range in the mid to late 80's, and its particular version of Tektronix's
- graphics protocols came to be accepted as a new standard, and a follow-on to
- TEK 4014, by then very long in the tooth. However, the TEK4125 protocols came
- too late in the game to win anything like the universal acceptance of TEK4014.
- Graphics terminals are close to a dead issue now, replaced by workstations and
- X terminals. Still, there's a fair amount of code out there that speaks
- TEK4125, and since TEK4125 includes TEK4014, all the really old code continues
- to work. So, the protocols live on.
-
- A TEK4125 window is simply a terminal emulator that uses the TEK4125 protocols
- rather than the ANSI protocols you are more familiar with. The 4125 was a
- VERY sophisticated terminal - essentially, it was a special-purpose work-
- station; as I recall, you could attach a local floppy disk to it! - and had
- a great deal of local intelligence. It provided its own user interface,
- which you see emulated when you bring up a TEK4125 window.
-
- I'm not sure where you can find documentation on the TEK4125 protocol. The
- last time I saw a Textronix document for a 4125 terminal, it must have run
- between 100 and 200 fairly dense pages.
-
- General interest query: Is Tektronix still making terminals? Anyone know?
-
- -- Jerry
-
-