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FOR ADVANCED PROGRAMMERS:
MEMORY LOCATIONS USED BY THE GRAPPLER
The Grappler Interface uses those RAM locations set aside for
its particular slot and the slot scratchpad area common to all
slots. The ROM is turned on using the standard ROM expansion
protocol and resides in locations $C8ØØ to $CFFF. The entry
points and the various RAM variables are listed below (N=Slot
number):
Cold Entry
Warm Entry
Left Margin
Right Margin
Line Length
Page Length
Character Counter
Line Counter
Current Cmd. Char. = $778 + $ØN
Text Flags
Text Flag Bit Representations: (Bit 7 - Output high order bit)
= $CNØØ
= $CNØ2
= $478 + $ØN
= $678 + $ØN
= $578 + $ØN
= $5F8 + $ØN
= $4F8 + $ØN
= $6F8 + $ØN
= $7F8 + $ØN
(Bit 6 - Video turned on)
(Bit 5 - LF after a CR)
(Bit 4 — Bell on)
—9—
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