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- From: gwyn@smoke.brl.mil (Doug Gwyn)
- Newsgroups: comp.terminals
- Subject: Re: AT&T 5620
- Message-ID: <19075@smoke.brl.mil>
- Date: 14 Aug 92 21:14:51 GMT
- References: <0eVcDdq00WB3QB5U9W@andrew.cmu.edu>
- Organization: U.S. Army Ballistic Research Laboratory, APG, MD.
- Lines: 49
-
- In article <0eVcDdq00WB3QB5U9W@andrew.cmu.edu> gr1c+@andrew.cmu.edu (Greg Howard Rhodes) writes:
- >First thing--it has a mouse! What am I supposed to do with this. So
- >far, the only time that it has been interesting is when I am looking
- >through the setup menu screens (you can click on things instead of
- >hitting function keys if you want).
- >Does it do any graphics? If so, does anyone have any drivers for it
- >(i.e. Gnuplot, etc).
- >Is there anywhere I could get manuals, etc, etc...?
- >Any information whatsoever would be appreciated. Thanks!
-
- There is a separate newsgroup, comp.terminals.tty5620, specifically for
- this terminal and its descendants (630, 730); you should post a query
- there since it's likely to result in more information in response.
-
- Basically, the 5620 DMD was the first commercial realization of the Bell
- Labs "Blit" terminal; it has either 256KB or 1MB of RAM, a bunch of ROM,
- a WE32010 processor, mouse, keyboard, and 800x1024 "portrait"-oriented
- bitmap display. A section of the RAM is directly mapped to the display,
- and the ROM contains a normal X3.64 terminal emulator and (in revision
- 8;7;5) an operating system that supports multiple windows, or "layers".
-
- Each layer can either use the resident terminal emulator or its own
- downloaded code. The ROM also contains numerous graphic support
- functions. Older models (revision 8;7;3) need to first have the layers
- operating system ("layersys") downloaded, after which all models behave
- similarly. Communication between the host computer and the terminal must
- be switched to a special packet protocol once the layers system is active;
- each layer gets its own shell on the host UNIX system and has its own
- communication channel between that shell process and the layer process.
-
- Typical layer processes include troff postprocessors (hardcopy previewers),
- utilities to print screen dumps on an attached serial printer, mouse-
- driven text editors, interactive drawing programs, etc. A Blit family
- terminal in typical layers use looks very much like an X11 terminal,
- although (with the exception of the 730X model) Blit terminals use their
- own protocol that is not compatible with the (later developed) X11 system.
-
- Although originally one had to license all the DMD (5620) host support
- software, which for most platforms meant porting a huge amount of code,
- the "bare bones" needed to enter layers mode of operation on BSD-based
- systems was developed and and put into the public domain, and is now
- being updated (see recent comp.terminals.tty5620 traffic for details).
- Eventually the AT&T UNIX System ToolChest, which is a wonderful source of
- valuable "research"-oriented UNIX software, may include enough 5620
- support that you could avoid having to license the old DMD host software
- packages.
-
- There was also a fairly extensive list of 5620 documentation in recent
- traffic in comp.terminals.tty5620. Good luck!
-