Tandy 1000 MS-DOS Reference Manual page 288

Chapter 13 / The DEBUG Utility
ASSEMBLE
A
[address]
Assembles Macro Assembler statements directly into memory.
Parameters
address is the starting address for the instructions to be assem-
bled in memory.
If you omit the address, the Assemble command begins at the
next address following the last assembled program. If no Assem-
ble statement was used previously, assembly starts at CS:0100.
All numeric values are hexadecimal and can be entered as 1-4
characters.
Notes
• If a statement contains a syntax error, DEBUG displays:
tError
and redisplays the current assembly address.
• The segment override mnemonics are CS:, DS:, ES:, and SS:.
The mnemonic for the far return is RETF. String manipula-
tion mnemonics must explicitly state the string size. For
example, use MOVSW to move word strings and MOVSB to
move byte strings.
• Prefix mnemonics must be specified in front of the opcode to
which they refer.
Examples
Near/Far
1
!
L.J
I ,
: l
~
I I
J ,
' - '
: I
G
I
I
c...-J
I
!
I '
The assembler automatically assembles short, near, or far jumps
and calls, depending on byte displacement, to the destination
address. These may be overridden with the NEAR or FAR prefix.
The NEAR prefix can be abbreviated to NE.
0100: 0500
JMP
0100:0502
JMP
0100:0505
JMP
502
NEAR 505
FAR 50A
a 2-byte short jump
a 3-byte near Jump
a 5-byte far Jump
i
I
~
I
I
'--.J
, i
I
I
L..-J
268
i )
~