manage the HI-SCORE in assembler

Hello to all you USER'S MSX of the world,

Request? How I can manage the HI-SCORE in assembler ??

Fortunatey, in this forum I found a old post di Danysoft, whose there is a source in
assembler that makes the SCORE work in assembler and I was very interested.

The source I'm talking about is below and it works very well:

; [YOUR GROUP] MSX Z80 source file.
;
; Prog: 
; Code: [YOUR HANDLE]
; Date:
;
; cmnt:
;
; Coded in TeddyWareZ' Chaos Assembler 3
;
; (C) 2001 [YOUR GROUP]!



	.org $C000 - 7

	.db $fe
	.dw startProgram,endProgram,startProgram

startProgram:
       
BEGIN:
        LD    HL,$00
        LD    (SCORE),HL
        LD    (SCORE+2),HL
        CALL  SEE
LOOP:
        CALL  $9F
        CP    ' '   ; exit if flag " " is set
        RET   Z
        CP    'W'
        JR    NZ,SKIP   ; skip if flag ch. "W" not set
        LD    DE,$15    ; add $15 pnt now! (ehm, that's 150000 points, right?)
        LD    BC,0
        JR    K00
SKIP:
        LD    DE,0
        LD    BC,$1000     ; add 1000$ pnt
K00:
        CALL  ADDSC
        CALL  SEE
        JR    LOOP
SEE:
        LD    HL,(SCORE+2)
        LD    DE,0
        CALL  ASCI
        LD    HL,(SCORE)
        LD    DE,4
        JP    ASCI

SCORE:  .DB    0,0,0,0

ADDSC:
        LD    IX,SCORE
        LD    A,(IX+0)
        ADD   A,C
        DAA
        LD    (IX+0),A
        LD    A,(IX+1)
        ADC   A,B
        DAA
        LD    (IX+1),A
        LD    A,(IX+2)
        ADC   A,E
        DAA
        LD    (IX+2),A
        LD    A,(IX+3)
        ADC   A,D
        DAA
        LD    (IX+3),A
        RET

ASCI:
        LD    A,E
        DI
        OUT   ($99),A
        LD    A,D
        OR    64
        OUT   ($99),A
        EI

        LD    A,H
        CALL  NUM1
        LD    A,H
        CALL  NUM2
        LD    A,L
        CALL  NUM1
        LD    A,L
        JR    NUM2

NUM1:
        RRA
        RRA
        RRA
        RRA
NUM2:
        AND   $0F
        ADD   A,'0'
        OUT   ($98),A
        RET


endProgram:

.end

How could i do to add HI-SCORE, to this important source in assembler?
I wait your good news
Thanks in advance
Regards
(^_^)
AG.