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authorJacob McDonnell <jacob@jacobmcdonnell.com>2026-04-26 16:38:00 -0400
committerJacob McDonnell <jacob@jacobmcdonnell.com>2026-04-26 16:38:00 -0400
commit97d5c458cfa039d857301e1ca7d5af3beb37131d (patch)
treeb460cd850d0537eb71806ba30358840377b27688 /static/v10/man3/ddsput.3
parentb89dc2331a50c63f8b33272a5c4c61ab98abdaa3 (diff)
build: Better Build System
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-.pa 1
-.he 'DDSPUT, DDSINIT (III)'1/15/73'DDSPUT, DDSINIT (III)'
-.ti 0
-NAME ddsput -- put a character on display data set
-.sp
-.ti 0
-SYNOPSIS (file descriptor in r0)
-.br
-jsr pc,ddsinit
-
-.br
-(character in r0)
-.br
-jsr pc,ddsput
-.sp
-.ti 0
-DESCRIPTION These routines
-provide an interface to the Display Data Set, a peculiar
-device which can be called by Picturephone sets and which
-will display some of the ASCII character set and certain
-other graphics on the Picturephone screen.
-
-If the DC11 or other interface hardware is not already
-set up to talk to the Display Data Set, the ddsinit_______
-entry should be called with the appropriate file descriptor in r0.
-On the only known DDS attached to UNIX, the associated special file
-is called "/dev/ttyc".
-ddsinit_______ also clears the display.
-
-Thereafter, characters may be displayed
-by calling ddsput______.
-To the extent possible, ddsput______ simulates an ordinary terminal.
-Characters falling to the right of the 22X22 screen
-area are ignored; the 23rd line on the screen causes
-the screen to be erased and that line to be put at the top
-of the new display.
-Certain ASCII characters are interpreted specially as follows:
-
-.in +5
-.ti -5
-FF clear screen, go to top left
-.ti -5
-HT expand to right number of spaces
-.ti -5
-DC1 treat as reverse line feed (move N)
-.ti -5
-DC2 move cursor 1 place right (move E)
-.ti -5
-DC3 forward line feed (move S)
-.ti -5
-DC4 backspace 1 position (move W)
-.ti -5
-SO enter graph mode
-.ti -5
-SI leave graph mode
-.ti -5
-CR put cursor at start of current line
-
-.in -5
-Graph mode allows display of the non-ASCII characters and
-will be described when hell freezes over.
-
-Lower-case ASCII alphabetics are mapped into upper case.
-Several ASCII non-alphabetic graphics
-are unavailable as well. Also the lower right circle of
-the "%" character is missing.
-Also one of the circuit cards in the DDS has a crack in it and
-sometimes it doesn't work.
-All in all,
-it is best to avoid this device.
-.sp
-.ti 0
-FILES kept in /lib/liba.a
-.sp
-.ti 0
-SEE ALSO AT&T writeup on DDS
-.sp
-.ti 0
-DIAGNOSTICS --
-.sp
-.ti 0
-BUGS yes