Apple Grr - Manual (Page 5)

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Character Counter
Line Counter
Current Cmd. Char.
Text Flags
Text Flag Bit Representations: (Bit 7 — Output high order bit)
(Bit 6 — Video turned on)
(Bits
S6F8 + $0N
S4F8 $0N
S6F8 + $0N
$778 + $0N
S7F8 + $0N
APPENDIX A
USING GRAPPLERTM COMMANDS WITHIN A PROGRAM
The following table illustrates how a few Grappler
commanrds
V70uld
be
used
within a program:
INTERGER BASIC APPLESOFT DESCRIPTION
LF after a CR)
(Bit 4 — Bell on)
CUSTOM DRIVERS
If you are writing your own drivers, the following
locations are used
to
access
the
card
(Y = NO
where
N =
Slot#):
Printer Status — SC®8t,Y (READ)
Output Latch - SCOSBt.Y (WRITE)
Strobe Low - $C(Zi82,Y (WRITE)
Strobe High - $0284,Y (WRITE)
The following routine gives an example of how to
output a character using these locations:
1(2 PRINT
''CTRL-D";"PR#1'
1(2 PRINT
CHR$(4);''PR#V
2(2 PRINT
•'CTRL-I";''8(2N''
3(2 PRINT
"TESTING"
4(2 POKE
36,5l2:PRINT''TESTING"
50 PRINT
20 PRINT
CHR$(9);''80N"
30 PRINT
"TESTING"
40 POKE
36,50:PRINT"TESTING"
50 PRINT
PHA SAVE OUTPUT CHARACTER ON STACK "CTRL-I";"CTRL-A" CHRS(9);CHR$(1)
LDY 10 SET UP Y-REGISTER FOR SLOT #1
PAPER? LDA SC081 ,Y CHECK STATUS FOR PAPER
AND 04 CHECK BIT 2
BNE PAPER? IF SET THEN NO PAPER. RECHECK 60 PRINT 60 PRINT
SECT? LDA SC081 ,Y CHECK STATUS FOR PRINTER SELECT "CTRL-A";"10L" "CHRS(1);"10L"
AND 02 CHECK BIT 1
BEQ SECT? IF ZERO THEN NOT SELECTED
BUSY? LDA $C08 1Y CHECK STATUS FOR PRINTER BUSY
AND 08 CHECK BIT 3
70 PRINT
BNE BUSY? IF SET THEN PRINTER IS BUSY
70 PRINT
OUTPUT? PLA RESET OUTPUT CHARACTER
"THE GRAPPLER" "THE GRAPPLER"
STA SC081 ,Y STORE TO OUTPUT LATCH
(.
STA $C082,Y PULL STROBE LINE LOW
STA $C084,Y RESET STROBE LINE HIGH
80 PRINT
RTS RETURN FROM SUBROUTINE
80 PRINT
“CTRL-D";"PR#0" CHR$(4);"PR#0"
Turns on
Grappler’^'^. If
you are nof
using DOS (disk
operating
system) then
enter the line ,
as: 10 PR#1
Set line length to
80 columns and
turn off Apple
video.
Prints "Testing"
on the printer.
Tabs to the 51st
column and
prints "Testing".
Charges the
CTRL-1
command
character to
CTRL-A
Sets left margin
to 10, notice use
of new
command
character,
CTRL-A
Prints "The
Grappler".
Notice printing
starts at 10th
column.
Turns off
Grappler. if you
are not using
DOS enter the
line as: 80 PR#0
NOTES;
Whenever you see CTRL-i enter the command, control I, as explained
in the section "Text Features," For example, since control characters
don't appear on the screen, line 10 will look like this; 10 PRINT " ", 'PR» i".
When tabbing past 40 columns, you must set the line length greater
than 40 (CTRL-InN) and then use tne POKE 36,n command shown odovg