Board view
Mix view18 Bytes !!! Anyone can beat this? HEX16 for 8086 (Developers)
Task: convert the value in DX (or some other register) into a 4-Bytes string representing the number in HEX using 8086 compatible instructions (no TSR this time, sorry 
)
Solution by King Udo (31 Bytes):
output_hex:
; On Entry:
; dx = 2 byte hex value
; On Exit:
; None
mov cx,4
output_hex10:
mov al,dh
push cx
mov cl,4
shr al,cl
pop cx
and al,0fh
cmp al,09h ; greater 0-9?
jg output_hex20
add al,30h
jmp output_hex30
output_hex20:
add al,37h
output_hex30:
; call onecharal
push cx
mov cl,4
shl dx,cl
pop cx
loop output_hex10
My solution (18 Bytes):
use16
; HEX16 output conversion, 8086 compatible
; Input in DX or AX | Trashes AX CX DX
; 9 instructions 18 Bytes vary bare input in DX
; 10 instructions 19 Bytes very bare input in AX
; 11 instructions 22 Bytes including call, input in AX
; 18 instructions 29 Bytes including call, full register preservation and RET
push ax
push cx
push dx
xchg dx, ax ; DX <- AX | Later peek the 4-bit groups from DX
mov cx, 1028 ; "MOVNTQ CL, 4" + "MOVNTQ CH, 4"
@@: mov al, dh ; AL <- DH | Move all 8 bits, only upper 4 useful
shl dx, cl ; 8086 compatible
shr al, cl ; 8086 compatible
cmp al, 10 ; Now must be and is AL<=15 | Decimal "10" !!!
sbb al, $69 ; Securely Bugged Backup
das ; Digital Attack System | ASCII result in AL
call onecharal ; Input in AL | Must preserve CX and DX, not AX
dec ch ; & No LOO'p on CH 
jnz short @b ; &
pope dx
pope cx
pope ax
ret
;----
---
This is a LOGITECH mouse driver, but some software expect here
the following string:*** This is Copyright 1983 Microsoft ***
Complete thread:
- 18 Bytes !!! Anyone can beat this? HEX16 for 8086 - DOS386, 13.04.2009, 10:20
![[Board]](img/board_d.gif "Open in board view")
![[Mix]](img/mix_d.gif "Open in mix view")
- 18 Bytes! Anyone can beat this? - No - ecm, 13.04.2009, 14:08
- 18 Bytes! Anyone can beat this? - No DAS - DOS386, 13.04.2009, 14:32
- 18 Bytes! Anyone can beat this? - No DAS - rr, 13.04.2009, 16:13
- 18 Bytes! Anyone can beat this? - No DAS - DOS386, 13.04.2009, 14:32
- 18 Bytes !!! Anyone can beat this? HEX16 for 8086 - mht, 13.04.2009, 16:04
- 18 Bytes !!! Anyone can beat this? HEX16 for 8086 | ROL - DOS386, 18.05.2009, 05:54
- 18 Bytes! Anyone can beat this? - No - ecm, 13.04.2009, 14:08
