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.date
.first title
.title #####TVAX.DOC, Document VAX-TV.
.!
.!*****************************************************************************
.!
.subtitle #####Related Documentation.
.hl 1 Related Documentation.
.!
This document gives a short description of differences with TV for TOPS20.
This will probably enough for the experienced user.
The inexperienced user, can use the TOPS20 TV Editor Manual, AA-H181A-TM,
with this document.
.!
.subtitle #####Commands.
.hl 1 Commands.
.!
.hl 2 Conventions in this Document.
The following conventions are noted:
.no fill
.ls
.s 1
n	expression
n,m	begin-, and end-expression
q	one of the Q-registers
_^A	ctrl-A, <CTRL> and "A" on keyboard
.els
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.!
.hl 2 Commands.
.no fill
_@		followed by I, R, S, or _:R, _:S
_:		followed by K, R, S
_:X
_;		followed by _<SPACE_>, E, G, H, P, S, U, X, Y
_;Y		append input file to end buffer,
		if file too large for TV-buffer, an additional
		Y or _;Y can be used, to read next part
_<TAB_>
_=
_1A		remaining value can be passed to possible
		next command
C/nC
D/nD
E/nE
Gq
I/nI
J/nJ
K/nK/n,mK
L/nL
Mq/nMq	new: iterative execute M
R/nR
S/nS
NUq
X/nX/n,mX
n_\
_^L
_^J		(line-feed) on first position
_^H		(backspace) on first position
_<SPACE_>	(space) on first position
_<ESC_>	(escape)
_<CR_>	(carriage-return)
Y		same as _;Y, but clears buffer first
.fill
.!
.hl 2 Commands on VAX and DEC-20.
Commands are only described, in case they differ from standard DEC-20.
Refer to DEC-20 Documentation, TOPS-20 TV Editor Manual,
AA-H181A-TM.
.!
.hl 2 Commands on DEC-20 only.
.no fill
.s 1
	_^A		_"		O
	_^B		;C		P/nP/n,mP
	_^D		;D		PW
	_^E		;M		T/nT/n,mT
	_^E		;N		V/nV/n,mV
	_^N		;R		W
	_^S		;T		[
	_^T		;W		]
	_^V		==		_\
	_^X		?
	_^/		A
	_!		N
.fill
.hl 2 Commands on VAX only.
.no fill
.s 1
_;V/n;V	translate whole buffer, or n lines from
		uppercase to lowercase characters
.s 1
_;Z/n;Z	translate whole buffer, or n lines from
		lowercase to uppercase characters
.s 1
_;A/n;A	replace spaces by tabs, and discard "trailing"
		spaces in whole buffer, or n lines.
.s 1
_^X		switch between exact match, and both upper-
		and lower-case character match for
		R and S commands.
.fill
.!
.!*****************************************************************************
.!
.subtitle #####Expressions.
.hl 1 Expression.
.!
On both VAX and DEC-20, expressions are handled equal.
.br
Expressions are composed of the following characters:
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.ls
.s 1
_<SPACE_>
_#		OR-function
_%
_&		AND-function
_(
_)
_*
_+
_-
_.		also current buffer position
_/
0-9
B
Qq
Z
.s 1
H		special case: H is 0Z
.els
.fill
.!
.!*****************************************************************************
.!
.subtitle #####Terminal Input.
.hl 1 Terminal Input.
.!
Terminal I/O has been set up for HP2621, originally.
Taking in account some restrictions, working with VT100 or TAB-compiler
terminal is possible.
Mind that for HP-terminal, c/c flag is set to "C".
Terminal input is logged on file TVBACK..
.br
The following characters have a special meaning:
.no fill
.ls
.s 1
_<ESC_>		when given twice, end input
_<DEL_>		delete a character
_^G		once: BELL, twice: exit TV
_^C		exit TV
_^R		display input again
_^U		delete last line
_^W		delete last word
.els
.fill
During input of a file-name, the following also applies:
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.ls
.s 1
<_ESC_>		if first character of file-name: give previous
		specified file-name
_^G		back to command-level
_<CR_>		end of file-name
.els
.fill
Other control-characters, will be displayed as special characters
on HP-2621, for as well as input as output.
.s 1
During command-execution, pre-fetching of one character is done,
if this is _^G, execution will be terminated.
.s 1
Restrictions in VT100-mode:
.ls
.le
Control characters will not be displayed, a checkerboard-block will
appear.
le
With input of more than 3 lines, whole screen will be rebuild
at the time of output to terminal.
.els
Depending on terminal-settings, TV will decide whether the terminal
is a HP, or a VT100.
.no fill
.ls
.s 1
VT100: SET TERM /DEC
HP:    SET TERM /NODEC
.els
.fill
.!
.!*****************************************************************************
.!
.subtitle #####Restrictions.
.hl 1 Restrictions.
.!
.hl 2 Buffer-size.
Maximum buffer-size is 500,000 characters.
.!
.hl 2 Q-registers.
Maximum size for Q-registers, is 500,000 characters.
.!
.hl 2 Terminal Input.
Terminal input is restricted to 25 line in one time.
In case this limit is exceeded, TV executes the 25 lines first,
and generates an extra I-command for the remaining input.
.!
.hl 2 Command File Input.
Command-file input is restricted to 2,000 characters per command.
In case this limit is exceeded, it will be handled the same way,
the 25-line-limit for terminal input is handled.
.!
.!*****************************************************************************
.!
.s 4
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