Intel 8086 Web IDE & Emulator (2026 Edition)

📄 program.asm Line: 1, Col: 1 IP: 0700:0100h Cycles: 0

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; Hello 8086 DOS INT 21h
ORG 100h

LEA DX, msg
MOV AH, 09h
INT 21h

MOV AH, 4Ch
INT 21h

msg DB 'Hello!$', 0
RET

🖥️ Virtual Screen & Output (INT 10h / INT 21h) Mode 03h (80x25 Text)

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⌨️ Keyboard Buffer: 0 / 16

Chars: (empty)

Decimal ASCII: -

🧮 Registers & Status Flags

Double-click box to edit

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AX 0000h

AH 00

AL 00

BX 0000h

BH 00

BL 00

CX 0000h

CH 00

CL 00

DX 0000h

DH 00

DL 00

CS0700

IP0100

DS0700

ES0700

SR0202

SS0700

SPFFFE

BP0000

DI0000

SI0000

CF: 0 ZF: 0 SF: 0 OF: 0 PF: 0 AF: 0 IF: 1 DF: 0

⚙️ Disassembly & Breakpoints

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📚 Stack Inspector (SS:SP / BP) Closed

TOS: 0700:FFFE ▼

Stack elements (16-bit words): SP = FFFE | BP = 0000

Address	Hex (Word)	Dec	Pointer

💾 Memory Inspector (1 MB Physical RAM) Closed

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▼

Jump to:

📊 Variables Inspector (Data Segment) Closed

0 vars ▼

Name	Address	Type	Value
No data variables defined in current program.

⚡ Hardware Interrupts Controller (emu8086.hw) Closed

IF: 1 (Enabled) ▼

decimal	binary	action
0	`00000000`	do nothing.
1	`00000001`	move forward.
2	`00000010`	turn left.
3	`00000011`	turn right.
4	`00000100`	examine. examines an object in front using sensor. when robot completes the task, result is set to data register and bit #0 of status register is set to 1.
5	`00000101`	switch on a lamp.
6	`00000110`	switch off a lamp.

decimal

binary

action

00000000

do nothing.

00000001

move forward.

00000010

turn left.

00000011

turn right.

00000100

examine. examines an object in front using sensor. when robot completes the task, result is set to data register and bit #0 of status register is set to 1.

00000101

switch on a lamp.

00000110

switch off a lamp.

decimal	binary	meaning
255	`11111111`	wall
0	`00000000`	nothing
7	`00000111`	switched-on lamp
8	`00001000`	switched-off lamp

decimal

binary

meaning

255

11111111

wall

00000000

nothing

00000111

switched-on lamp

00001000

switched-off lamp

bit number	description
bit #0	zero when there is no new data in data register, one when there is new data in data register.
bit #1	zero when robot is ready for next command, one when robot is busy doing some task.
bit #2	zero when there is no error on last command execution, one when there is an error on command execution (when robot cannot complete the task: move, turn, examine, switch on/off lamp).

bit number

description

bit #0

zero when there is no new data in data register, one when there is new data in data register.

bit #1

zero when robot is ready for next command, one when robot is busy doing some task.

bit #2

zero when there is no error on last command execution, one when there is an error on command execution (when robot cannot complete the task: move, turn, examine, switch on/off lamp).