Commodore Plus 4 - Page 241

Machine-Language Monitor Commands 229
A address opcode mnemonic operand
or
. address opcode mnemonic operand
The address is the hexadecimal address at which the line of machine code is
placed.
The opcode mnemonic is a valid 6502 mnemonic (see section on 6502 instruc
tion set).
The operand is a valid 6502 operand (see section on 6502 instruction set and
addressing modes).
When such a line and a RETURN are entered, the monitor translates the
mnemonic and operand into hexadecimal and outputs them. Then it automati
cally calculates the next available address and waits for the next line of code. If
only a RETURN is entered following the A address prompt, the monitor exits
assembly mode. If an incorrect line is entered, the translation to hexadecimal is
not done, and a question mark is displayed. Also, the monitor does not attempt to
calculate a next available address.
Example: A 2000 LDA #$05
will result in the following display:
A 2000 A9 05 LDA #$05
A SOOS
The monitor is asked to assemble a load accumulator with the number 5 instruc
tion at the address $2000. It translates this into the hexadecimal codes A9 and 05.
It then prompts for the next line of code at address $2002.
Comparing Two Sections of Memory—The C Command
The C (Compare) command is used to find the differences in content between two
sections of memory. The syntax is as follows:
C start address 1 end address 1 start address 2
The start address 1 is the hexadecimal address at which the first section of
memory begins. The end address 1 is the last hexadecimal address of the first
section of memory. The start address 2 is the hexadecimal address of the section
of memory to compare with the previously defined section. No end address is