ID Number: Q74882
5.10 5.01a 6.00 | 5.10 5.01a 6.00
MS-DOS | OS/2
Summary:
The assembly language multiplication instruction MUL accepts only one
operand. The second operand is implied to be either the AX or the AL
register depending on whether an 8-bit multiplication or 16-bit
multiplication is being performed.
If a second operand is specified, the Microsoft Macro Assembler (MASM)
version 6.0 will generate the following error:
error A2008: syntax error : ,
MASM versions 5.1 and 5.1a generate the following warning:
warning A4001: Extra characters on line
The sample code below can be used to illustrate this situation.
Assembling the code with MASM version 5.1, 5.1a, or 6.0 will result in
one of the above errors.
Sample Code
-----------
; Assemble options needed: none
.MODEL small
.CODE
mul ah, 10
END