Commodore Plus 4 - Page 196

disassembly is a period rather than an A (for readability), and the
Hexadecimal of the code is listed as well.
A disassembly listing can be modified using the screen editor. Make
any changes to the mnemonic or operand on the screen, then hit a
carriage return. This enters the line and call the assembler (or further
modifications —
A disassembly can be paged. Typing a D causes the next page of dis
assembly to scroll onto the screen —-
EXAMPLE: D 3000 3004
3000 A900 LDA#S00
3002 FF TO.
3003 DO 2B BNE $3030 —
COMMAND: F (FILL) __
PURPOSE. Fill a range of locations with a specified byte.
i
SYNTAX: F oddress 1> oddress 2> <byte>
oddress 1 > The firs! location to fill with the <by!e>
oddress 2> The last location to fill with the <byte>
<by(e valued A 1 or 2 digit hexadecimal number to be written
This command is useful for initializing data structures or any other
RAM area.
EXAMPLE F 0400 0518 EA
Fills memory locations from 50400 to S0518 with SEA (a NOP
instruction )
COMMAND: G
PURPOSE Begin execution of a program at a specified address.
SYNTAX: G[ oddress >}
Oddress > An optional argument specifying the new value of the
program counter and address where execution is to start When
<address> is left out. execution begins at the current PC. (The
current PC can be viewed using the R command.)
The GO command restores all registers {displayable by the R com
mand) and begins execution at the specified starting address. Caution
_
187"