19 Apr
1999
19 Apr
'99
4:18 p.m.
> MOV CL, 4
> SHL AX, 4
> RET
Why not SHL AX,4?
Because the 8088 didn't HAVE a shift immediate instruction. Check with
Allison about which processor introduced it, and when it cam out. Was 286
<= 1983?
OOOPs! the code should be replaced by:
;entry condition:
; AX contains number
; DS contains location of data segment
; content of data segment same as before
;exit condition:
; DS:0 points to result
;code:
ADD DS, AX
RET
--
Fred Cisin cisin(a)xenosoft.com
XenoSoft http://www.xenosoft.com
2210 Sixth St. (510) 644-9366
Berkeley, CA 94710-2219