Apple Grr - Manual (Page 2)

TEXT FEATURES
Before sending a character to the printer, the
Grappler will check ttie SELECT and PAPER EMPTY status
lines. If the printer is not "online," or is out of paper, a
warning will be printed on the screen and the Apple will
beep. If this occurs check the following:
1. The cable is firmly and properly attached to the
printer.
2. The cable is firmly seated on the Grappler interface
card.
3. The printer is on.
4. The printer is on-line.
5. There is paper in the printer. Note: The Grappler will
not check for paper on Epson printers.
6. The printer is set up for parallel operation. (Check
Appendix B of this manual for proper dip switch
settings.)
Once the error condition has been corrected you may
continue by pressing the return key.
The Grappler interface has many text features,
including adjustable margins, line length, page length,
etc. All commands affecting these features are listed on
the following pages with a description of their function.
Each one is preceded by a control character which is
CTRL-1 from BASIC or CTRL-Y from Pascal or CP/M, unless
specifically changed by the user's program.
To type a control character, hold down the control key
(marked "CTRL" on the Apple) and then press the
appropriate letter. Then release the letter key, and then
the control key. Control characters do not appear on
the screen as they are typed. You may also use the
CHR$ function found in Applesoft Basic (consult your
Apple manual and Appendix A).
TEXT COMMANDS
Spaces have only been used to make the commands
easier to read: do not type the spaces when issuing the
command.
PR'^'n Turns on the Grappler interface card, n is
equal to the slot number of the Grappler.
All subsequent characters appearing on
the Apple video screen will also be
printed on the printer. This command
must be used before any of the following
commands will be accepted by the
Grappler.
PR^(i Turns off the Grappler.
CTRL-1 A Append line feeds onto carriage returns.
Basic will not send a linefeed after a
carriage return. This means the printhead
will return to the left margin but will not
advance the paper. The Grappler will
automatically issue a linefeed command
and advance the paper after every
carriage return. If your printer is
performing double line spacing, check
Appendix B of this manual.
CTRL-1 K Don't append linefeeds onto carriage
returns.
CTRL-1 H Allows the high order (8th) bit to be
output to the printer. On many printers
this has no effect. On some it allows
printing of block graphics (Epson MXI8ij}].
However, when block graphics ore being
printed, the standard character set is not
accessible.
CTRL-1 X Don't output the high order bit to the
printer. This puts the printer back in
standard text mode.
CTRL-InN Set line length to n characters from left
side of page (not from left margin). After
issuing this command, characters will
only be printed on the printer, and not
on the Apple video screen. A carriage
return will automatically be generated
.after n characters have been printed. If
the line length is set to zero, the Grappler
will not issue a carriage return until it
receives one from the Apple. Note: When
listing basic programs, the printing will
automatically be formatted for
4(3 columns unless this command is used
(i.e. CTRL-1 80 N).
CTRL-II Transmits characters to both the Apple
screen and printer. When the line length
is set with a CTRL-InN command the
screen will be turned off and printed
characters will go only to the printer, if
you wish characters to appear on the
screen while they are being printed, use
this command. However, this command
will not work when listing a program.