The document contains assembly code that determines the range of signed and unsigned numbers that can be handled by a microprocessor. For signed numbers, it uses logic operations like OR and SHIFT to find the minimum (-32768) and maximum (32767) values. For unsigned numbers, it directly stores 0 and the maximum (65535) values obtained by inverting the bits of 0.

1. C:HomeNIT0_ClassAutumn 2012Microprocessor Labup Programs8086up_8086_Q9.asm 05 August 2012 15:40
; Q 9>
; a> Determine the range of signed numbers the uP can handle
SW 2000h
[2000h] = (ans) ; Minimum signed number
[2002h] = (ans) ; Maximum signed number
.
A
1000h
mov cl, 04h
mov ax, 0008h
loop_min:
or ax, ax
js num_min
shl ax, cl
jmp loop_min
num_min:
mov [2000h], ax
not ax
mov [2002h], ax
hlt
.
GO 1000h
INT ;(try '.' here)
SW 2000h ; ans = 8000h => -32768
SW 2002h ; ans = 7FFFh => 32767
.
; b> Determine the range of unsigned numbers the uP can handle
SW 2000h
[2000h] = (ans) ; Minimum unsigned number
[2002h] = (ans) ; Maximum unsigned number
.
A
1000h
mov ax, 0000h
mov [2000h], ax
not ax
mov [2002h], ax
hlt
.
GO 1000h
INT ;(try '.' here)
SW 2000h ; ans = 00000h => 0
SW 2002h ; ans = 0FFFFh => 65535
.
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