CLI
;(1) Disable Keyboard (Send To Keyboard Controller command 0xAD <disable keyboard>)
CALL waitForWrite
MOV al, 0xAD
OUT 0x64, al
;(2) Make sure that mouse port is active by enbling it (command 0xA8)
CALL waitForWrite
MOV al, 0xA8
OUT 0x64, al
;(3) Reset The Mouse (Send To Keyboard Controller command 0xD4 <write to mouse> and send to Mouse command 0xFF <reset>)
CALL waitForWrite
MOV al, 0xD4
OUT 0x64, al
CALL waitForWrite
MOV al, 0xFF
OUT 0x60, al
;(4) Reset Completition (Wait for mouse to sent 0xAA and mouseID - then assume reset mode complete and enters stream mode)
CALL waitForRead
IN al, 0x60 ;FA - ACK
IN al, 0x60 ;AA - Reset Success; FC - Failure at reset
CMP al, 0xAA
JNE .hang
IN al, 0x60 ;If success - MouseID
;(5) Enable mouse clock and IRQ12 by Keyboard Controller Command Byte
CALL waitForWrite
MOV al, 0x20
OUT 0x64, al
CALL waitForRead
IN al, 0x60
OR al, 0x2
AND al, 0xDF
MOV bl, al
CALL waitForWrite
MOV al, 0x60
OUT 0x64, al
CALL waitForWrite
MOV al, bl
OUT 0x60, al
;(6) Enable mouse to send data (Mouse command 0xF4)
CALL waitForWrite
MOV al, 0xD4
OUT 0x64, al
CALL waitForWrite
MOV al, 0xF4
OUT 0x60, al
CALL waitForRead ;Should receive acknowledge from mouse
IN al, 0x60
STI

...
waitForWrite: PUSH ax
.loop:IN al, 0x64
TEST al, 2
JNZ .loop
POP ax
RET

waitForRead: PUSH ax
.loop:IN al, 0x64
TEST al, 1
JZ .loop
POP ax
RET