Курсовая работа: Шина расширения ISA

mov ax,3508h

int 21h

mov ax,es: old_seg

mov ds,ax

mov ax,es: old_offs

mov dx,ax

mov ax,2508h

int 21h

mov ah,49h

int 21h

mov ax,4c00h

int 21h

first_instruction:

cmp byte ptr [es: 80h],1

jbe resume

mov bx, 82h

and byte ptr es: [bx],0dfh

cmp byte ptr es: [bx],'U'

je release

resume:

mov ax,3508h

int 21h

; 30 39 68 6F 6F 6B

cmp word ptr es: [bx+2], 3830h

jne setupTSR

cmp word ptr es: [bx+4], 6f68h

jne setupTSR

cmp word ptr es: [bx+6], 6b6fh

jne setupTSR