Commodore PC - Page 286

1214 MS-DOS User's Reference
Debug also cannot tell whether an operand refers to a memory ^—^
location or to an immediate operand. So, it uses the common con
vention that operands enclosed in square brackets refer to mem
ory. For example: v^/
MOV
MOV
AX
AX
,21
, C21 ]
; Load AX wi
; Load AX wi
; contents
; of memory
th 21H
th the
location 21H
Two popular pseudo-instructions are available with the A (assem- ^—^
ble) command: the DB opcode, which assembles byte values
directly into memory; and the DW opcode, which assembles word
values directly into memory. Following are examples of both: ^ )
DB 1 ,2,3,4,"THIS IS AN EXAMPLE"
DB 'THIS IS A QUOTATION MARK: M/ , ,
DB "THIS IS A QUOTATION MARK: /M W
DW 1000,2000,3000,"BACH"
The A command supports all forms of register indirect commands.
For example:
ADD BX,34CBP+2].[SI-1] ^
POP [BP+DI]
PUSH [SI]
All opcode synonyms are also supported, as in the next example:
LOOPZ 100 U
LOOPE 100
JA 200 ( ,
JNBE 200 KJ
For 8087 opcodes, the WAIT or FWAIT prefixes must be explic
itly specified, as in these last examples: V_/
FWAIT FADD ST,ST(3) ; This line assembles
; an FHAIT prefix i )
LD TBYTE PTR CBX3 ; This line' does not v—/
KJ