Listings 48 and 49

asm_files/list-0048.asm

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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 48
+; ========================================================================
+
+bits 16
+
+mov cx, 200
+mov bx, cx
+add cx, 1000
+mov bx, 2000
+sub cx, bx

asm_files/list-0048.txt

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+--- test\listing_0048_ip_register execution ---
+mov cx, 200 ; cx:0x0->0xc8 ip:0x0->0x3 
+mov bx, cx ; bx:0x0->0xc8 ip:0x3->0x5 
+add cx, 1000 ; cx:0xc8->0x4b0 ip:0x5->0x9 flags:->A 
+mov bx, 2000 ; bx:0xc8->0x7d0 ip:0x9->0xc 
+sub cx, bx ; cx:0x4b0->0xfce0 ip:0xc->0xe flags:A->CS 
+
+Final registers:
+      bx: 0x07d0 (2000)
+      cx: 0xfce0 (64736)
+      ip: 0x000e (14)
+   flags: CS

asm_files/list-0049.asm

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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 49
+; ========================================================================
+
+bits 16
+
+mov cx, 3
+mov bx, 1000
+loop_start:
+add bx, 10
+sub cx, 1
+jnz loop_start

asm_files/list-0049.txt

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+--- test\listing_0049_conditional_jumps execution ---
+mov cx, 3 ; cx:0x0->0x3 ip:0x0->0x3 
+mov bx, 1000 ; bx:0x0->0x3e8 ip:0x3->0x6 
+add bx, 10 ; bx:0x3e8->0x3f2 ip:0x6->0x9 flags:->A 
+sub cx, 1 ; cx:0x3->0x2 ip:0x9->0xc flags:A-> 
+jne $-6 ; ip:0xc->0x6 
+add bx, 10 ; bx:0x3f2->0x3fc ip:0x6->0x9 flags:->P 
+sub cx, 1 ; cx:0x2->0x1 ip:0x9->0xc flags:P-> 
+jne $-6 ; ip:0xc->0x6 
+add bx, 10 ; bx:0x3fc->0x406 ip:0x6->0x9 flags:->PA 
+sub cx, 1 ; cx:0x1->0x0 ip:0x9->0xc flags:PA->PZ 
+jne $-6 ; ip:0xc->0xe 
+
+Final registers:
+      bx: 0x0406 (1030)
+      ip: 0x000e (14)
+   flags: PZ