/* Main.c file generated by New Project wizard
*
* Created: sáb out 11 2025
* Processor: 8086
* Compiler: Digital Mars C
*
* Before starting simulation set Internal Memory Size
* in the 8086 model properties to 0x10000
*/
// robot base i/o port:
#define r_port 9
unsigned int count = 0;
void Robot(void)
{
asm {
//===================================
mov ax,0
mov dx,199
out dx,ax
eternal_loop:
cmp count,5
je Happy
// wait until robot
// is ready:
call wait_robot
// examine the area
// in front of the robot:
mov al, 4
out r_port, al
call wait_exam
// get result from
// data register:
in al, r_port + 1
// nothing found?
cmp al, 0
je cont // - yes, so continue.
// wall?
cmp al, 255
je cont // - yes, so continue.
// switched-on lamp?
cmp al, 7
jne lamp_off // - no, so skip.
// - yes, so switch it off,
// and turn:
//call switch_off_lamp
jmp cont // continue
lamp_off: nop
// if gets here, then we have
// switched-off lamp, because
// all other situations checked
// already:
call switch_on_lamp
cont:
call random_turn
call wait_robot
// try to step forward:
mov al, 1
out r_port, al
call wait_robot
// try to step forward again:
mov al, 1
out r_port, al
jmp eternal_loop // go again!
//===================================
// this procedure does not
// return until robot is ready
// to receive next command:
wait_robot:
// check if robot busy:
busy: in al, r_port+2
test al, 0b00000010
jnz busy // busy, so wait.
ret
//===================================
// this procedure does not
// return until robot completes
// the examination:
wait_exam:
// check if has new data:
busy2: in al, r_port+2
test al, 0b00000001
jz busy2 // no new data, so wait.
ret
//===================================
// switch off the lamp:
switch_off_lamp:
mov al, 6
out r_port, al
ret
//===================================
// switch on the lamp:
switch_on_lamp:
syncronize:
mov al, 5
out r_port, al
// wait until robot
// is ready:
call wait_robot
// examine the area
// in front of the robot:
mov al, 4
out r_port, al
call wait_exam
// get result from
// data register:
in al, r_port + 1
cmp al,8
je syncronize
cmp al,255
je syncronize
inc count
mov ax,count
mov dx,199
out dx,ax
ret
//===================================
// generates a random turn using
// system timer:
random_turn:
// get number of clock
// ticks since midnight
// in cx:dx
mov ah, 0
int 1ah
// randomize using xor:
xor dh, dl
xor ch, cl
xor ch, dh
test ch, 2
jz no_turn
test ch, 1
jnz turn_right
// turn left:
mov al, 2
out r_port, al
// exit from procedure:
ret
turn_right:
mov al, 3
out r_port, al
no_turn:
ret
//===================================
Happy:
mov al, 3
out r_port, al
call wait_robot
// try to step forward:
mov al, 1
out r_port, al
call wait_robot
jmp Happy
}
}
void main(void)
{
// Write your code here
Robot();
while (1)
{
}
}
