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Listing 52

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Joseph Ferano 2025-03-21 20:47:34 +07:00
parent 11ccfe78a9
commit 3ca4059c44
2 changed files with 78 additions and 0 deletions
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36
asm_files/list-0052.asm Normal file
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; ========================================================================
;
; (C) Copyright 2023 by Molly Rocket, Inc., All Rights Reserved.
;
; This software is provided 'as-is', without any express or implied
; warranty. In no event will the authors be held liable for any damages
; arising from the use of this software.
;
; Please see https://computerenhance.com for further information
;
; ========================================================================
; ========================================================================
; LISTING 52
; ========================================================================
bits 16
mov dx, 6
mov bp, 1000
mov si, 0
init_loop_start:
mov word [bp + si], si
add si, 2
cmp si, dx
jnz init_loop_start
mov bx, 0
mov si, 0
add_loop_start:
mov cx, word [bp + si]
add bx, cx
add si, 2
cmp si, dx
jnz add_loop_start

42
asm_files/list-0052.txt Normal file
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--- test\listing_0052_memory_add_loop execution ---
mov dx, 6 ; dx:0x0->0x6 ip:0x0->0x3
mov bp, 1000 ; bp:0x0->0x3e8 ip:0x3->0x6
mov si, 0 ; ip:0x6->0x9
mov word [bp+si], si ; ip:0x9->0xb
add si, 2 ; si:0x0->0x2 ip:0xb->0xe
cmp si, dx ; ip:0xe->0x10 flags:->CPAS
jne $-7 ; ip:0x10->0x9
mov word [bp+si], si ; ip:0x9->0xb
add si, 2 ; si:0x2->0x4 ip:0xb->0xe flags:CPAS->
cmp si, dx ; ip:0xe->0x10 flags:->CAS
jne $-7 ; ip:0x10->0x9
mov word [bp+si], si ; ip:0x9->0xb
add si, 2 ; si:0x4->0x6 ip:0xb->0xe flags:CAS->P
cmp si, dx ; ip:0xe->0x10 flags:P->PZ
jne $-7 ; ip:0x10->0x12
mov bx, 0 ; ip:0x12->0x15
mov si, 0 ; si:0x6->0x0 ip:0x15->0x18
mov cx, [bp+si] ; ip:0x18->0x1a
add bx, cx ; ip:0x1a->0x1c
add si, 2 ; si:0x0->0x2 ip:0x1c->0x1f flags:PZ->
cmp si, dx ; ip:0x1f->0x21 flags:->CPAS
jne $-9 ; ip:0x21->0x18
mov cx, [bp+si] ; cx:0x0->0x2 ip:0x18->0x1a
add bx, cx ; bx:0x0->0x2 ip:0x1a->0x1c flags:CPAS->
add si, 2 ; si:0x2->0x4 ip:0x1c->0x1f
cmp si, dx ; ip:0x1f->0x21 flags:->CAS
jne $-9 ; ip:0x21->0x18
mov cx, [bp+si] ; cx:0x2->0x4 ip:0x18->0x1a
add bx, cx ; bx:0x2->0x6 ip:0x1a->0x1c flags:CAS->P
add si, 2 ; si:0x4->0x6 ip:0x1c->0x1f
cmp si, dx ; ip:0x1f->0x21 flags:P->PZ
jne $-9 ; ip:0x21->0x23
Final registers:
bx: 0x0006 (6)
cx: 0x0004 (4)
dx: 0x0006 (6)
bp: 0x03e8 (1000)
si: 0x0006 (6)
ip: 0x0023 (35)
flags: PZ