JobOS/teletype.asm at master · rsimari/JobOS · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
	BITS 16
	%INCLUDE "jobos.inc"
	ORG 0x8000
start:


	mov si, tele_prompt
	call os_clear_screen

	call os_print_string


.read: 		; commands we should support - ls - list available programs/actions, run something

	; wait for input
	call os_read_char

.check_back:
	cmp dl, 8
	jne .check_esc

	mov al, dl

	push cx
	call os_write_char
	mov al, 0
	call os_write_char
	mov al, 8
	call os_write_char
	pop cx

	jmp .read

.check_esc:
	cmp dl, 27
	jne .write

	jmp exit


.write:

	mov al, dl

	push cx
	call os_write_char 	; prints char at the cursor position
	pop cx

	jmp .read 	; keep getting chars

exit:
	ret


tele_prompt db "Welcome to Teletype - Press ESC to exit", 13, 10, 0