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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 7387c8f97b
commit cb5bb5e222
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12
Task/Address-of-a-variable/8086-Assembly/address-of-a-variable-1.8086 Normal file
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.model small
.stack 1024
.data
UserRam 256 DUP (0) ;define the next 256 bytes as user RAM, initialize them all to zero.
.code
mov ax, seg UserRam ;load into AX the segment where UserRam is stored.
mov es, ax ;load that value into the Extra Segment register
mov ax, offset UserRam ;load into AX the address of UserRam
mov di, ax ;load that value into the destination index register

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Task/Address-of-a-variable/8086-Assembly/address-of-a-variable-2.8086 Normal file
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mov ax, 0FFFFh
mov [es:di],ax ;store 0xFFFF into the base address of UserRam.

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Task/Address-of-a-variable/8086-Assembly/address-of-a-variable-3.8086 Normal file
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.model small
.stack 1024
.data
UserRam 256 DUP (0) ;define the next 256 bytes as user RAM, initialize them all to zero.
.code
mov ax, @data ; load the data segment into ax
mov ds,ax ; point the data segment register to the data segment.
; (The 8086 can only load segment registers from ax, bx, cx, dx, or the pop command)
mov ax, 0FFFFh ; load the number 65535 (or -1 if you prefer) into ax.
mov word ptr [ds:UserRam] ; store this quantity in user ram.