26 Feb
2014
26 Feb
'14
2:06 p.m.
Hello,
I have some questions about Televideo 955 terminal.
The manual lists a serie of options, among others the ability of emulate
tek 40xx graphic terminals.
I'm interested in this feature, but it's not clear to me if a particular
version of the terminal, or a particular board is needed.
Furthermore, the manual pictures two different motherboards, normal and
extended, but what it's the difference?
Finally, there's a way to identify the hardware / software options of the
terminal with some key combination, our some special command?
Thanks
Andrea
26 Feb
26 Feb
3:07 p.m.
In article <CAM4zSsUO62Y0mJZfutmVexDSW0c=seKAwB7oWn_2civkH+LWYw at mail.gmail.com>,
shadoooo <shadoooo at gmail.com> writes:
I have some questions about Televideo 955 terminal.
The manual lists a serie of options, among others the ability of emulate
tek 40xx graphic terminals.
I'm interested in this feature, but it's not clear to me if a particular
version of the terminal, or a particular board is needed.
It's a Digital Engineering based retrographics board add-on.
Furthermore, the manual pictures two different
motherboards, normal and
extended, but what it's the difference?
Not sure, but have you looked at the service manuals?
Finally, there's a way to identify the hardware /
software options of the
terminal with some key combination, our some special command?
It's possible that the terminal identification string would tell you,
but since I don't have one with the graphics board, I can't say. (I
don't think I have a 955 at all; I have a 925.)
<http://terminals.classiccmp.org/wiki/index.php/TeleVideo_955>
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3:26 p.m.
The manual lists a serie of options, among others the
ability of emulate
tek 40xx graphic terminals.
I'm interested in this feature, but it's not clear to me if a particular
version of the terminal, or a particular board is needed.
The maintenance manual mentions a 26-pin header for the "graphics
board". The character-mode video output is handled by a 2674 AVDC,
which does seem to have some bitmap graphics capabilities, but page 4-19
states that the terminal uses character cells. At least one gate array
is in the video output chain, and combines the output from the AVDC with
other attributes and control signals to produce the final video signal.
It's possible that gate array can also substitute a graphics video
signal feed for part or all of the output, or even overlay it.
The operator manual mentions optional graphics firmware.
Furthermore, the manual pictures two different
motherboards, normal and
extended, but what it's the difference?
Again from the maint manual, there are two versions, "gate array logic
board" and "enhanced gate array logic board". Brief reading of the
maint manual doesn't leave me with the impression that the differences
are dramatic.
Finally, there's a way to identify the hardware /
software options of the
terminal with some key combination, our some special command?
According to the OM, the code to enable the optional graphics board is
"ESC m". You can ask the terminal to send its identity string with "ESC
M", but it likely only includes firmware version and RAM size.
De
4:12 p.m.
A retrographics board was available for the 950; not sure if that's
what the 955 also used:
<http://terminals.classiccmp.org/wiki/index.php/Digital_Engineering_RG-1000>
Because of the way Digital Engineering talked about their boards and
products, it's been very difficult for me to figure out which
statements are referring to which products.
--
"The Direct3D Graphics Pipeline" free book
<http://tinyurl.com/d3d-pipeline>
The Computer Graphics Museum <http://ComputerGraphicsMuseum.org>
The Terminals Wiki <http://terminals.classiccmp.org>
Legalize Adulthood! (my blog) <http://LegalizeAdulthood.wordpress.com>
4:25 p.m.
A retrographics board was available for the 950; not
sure if that's
what the 955 also used: [...]
I am inclined to doubt it. I have a 955 and a 950, and I've pulled the
955 apart enough to replace the ROMs (I gave mine a Latin-1 font
instead of the not-quite-Latin-1 it came with, and built a small video
game to run out of the user ROM socket - a friend started asking me
when to expect a NetBSD/tvi955 port :-).
But, in particular, the 955 has a great deal less physical space
available for addons than the 950 does, so it strikes me as unlikely
that an addon board exists that works with both.
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