Commodore 128D - Page 385

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Commodore 128
Monitor
Command
Descriptions
Number field (e.g. addresses, device numbers, and data bytes) may
be specified as a based number. This affects the operand field of the
ASSEMBLE command. Also note the addition of the directory syntax
to the disk command.
As a further aid to programmers, the Kernal error message facility
has been automatically enabled while in the Monitor. This means the
Kernal will display 'I/O ERROR #' and the error code, should there be
any failed I/O attempt from the MONITOR. The message facility is
turned off when exiting the MONITOR.
COMMAND: A
PURPOSE: Enter a line of assembly code.
SYNTAX: A (address) (opcode mnemonic) (operand)
(address)
(opcode
mnemonic)
(operand)
A number indicating the location
in memory to place the opcode.
(See 5-digit address note on pre
vious page.)
A standard MOS technology
assembly language mnemonic,
e.g., LDA, STX, ROR.
The operand, when required, can
be any of the legal addressing
modes.
A RETURN is used to indicate the end of the assembly line. If there
are any errors on the line, a question mark is displayed to indicate an
error, and the cursor moves to the next line. The screen editor-can
be used to correct the error(s) on that line.
•EXAMPLE
.A01200LDX#$00
.A01202
NOTE: A period (.) is equal to the ASSEMBLE command.
EXAMPLE:
.02000 LDA #$23
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APPENDIX J—Machine Language Monitor