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MAPPY-1D.BIN 
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address		purpose

   new  => old

A106: 7E 8E	jmp     $BFA4	; check_HSS_valid
A107: BF A1
A108: A4 52


A118: 7E B6	jmp	$BFC8	; sets the onscreen "high score" value
A119: BF 48			; based on the top high score table
A11A: C8 14			; entry



A153: 00 20			; modified default high score table

A156: 00 03			;
A157: 4A 42			;
A158: 50 45			;
A159: 52 48			;

A15B: 00 19			;
A15C: 00 87			;

A15E: 00 03			;
A15F: 4A 55			;
A160: 50 48			;
A161: 52 4F			;

A163: 00 17			;
A164: 00 56			;

A166: 00 02			;
A167: 4A 48			;
A168: 50 4F			;
A169: 52 59			;

A16B: 00 12			;
A16C: 00 13			;

A16E: 00 02			;
A16F: 4A 44			;
A170: 50 41			;
A171: 52 50			;

A173: 00 10			;
A174: 00 32			;

A176: 00 01			;
A177: 4A 50			;
A178: 50 59			;
A179: 52 41			; end modified default high score table



BFA4             ; ---------------------------------------------------------------------------
BFA4             check_HSS_valid:                        	; jump from $A106
							 	; check HS table has valid values

BFA4 8E 14 65                    ldx     #$1465         	; address of HS table (HST)
BFA7
BFA7             cHv_entries_loop:                       
BFA7 C6 03                       ldb     #3
BFA9
BFA9             cHv_digits_loop:                        
BFA9 86 40                       lda     #$40 			; '@' 
BFAB A1 84                       cmpa    ,x
BFAD 24 13                       bcc     digit_out_range	; digit < $40 clear HST

BFAF 86 60                       lda     #$60 			; '`'
BFB1 A1 80                       cmpa    ,x+
BFB3 25 0D                       bcs     digit_out_range	; digit > $60 clear HST

BFB5 5A                          decb
BFB6 26 F1                       bne     cHv_digits_loop	; check 3 digits

BFB8 30 05                       leax    5,x			; skip 5 bytes in HS table
BFBA 8C 14 8D                    cmpx    #$148D          	; last HST entry
BFBD 26 E8                       bne     cHv_entries_loop

BFBF 7E A1 18                    jmp     $A118			; continue system POR 


BFC2             ; ---------------------------------------------------------------------------
BFC2
BFC2             digit_out_range:
BFC2                                                     
BFC2 8E A1 52                    ldx     #new_HSS_names
BFC5 7E A1 09                    jmp     $A109 			; reset_HST
BFC8             ; ---------------------------------------------------------------------------
BFC8
BFC8             loc_BFC8:                               
BFC8 8E BF DC                    ldx     #$BFDC			; return_addr ( after setting
BFCB 34 10                       pshs    x			; the high score )
BFCD 34 10                       pshs    x
BFCF 34 10                       pshs    x
BFD1 8E 14 60                    ldx     #$1460			; set the onscreen high score
BFD4 86 FF                       lda     #$FF
BFD6 B7 20 39                    sta     $2039			; this code isn't actually needed
BFD9 7E F2 AF                    jmp     loc_F2AF		; call set score
BFDC             ; ---------------------------------------------------------------------------
BFDC
BFDC             return_addr:                            
BFDC FC 14 60                    ldd     $1460			; copy top high score from HST
BFDF FD 13 85                    std     $1385			; to internal high-score var
BFE2 B6 14 62                    lda     $1462			; checked during gameplay
BFE5 B7 13 87                    sta     $1387

BFE8 B6 48 14                    lda     $4814			; restore code moved from POR
BFEB 7E A1 1B                    jmp     $A11B			; jump back to continue_POR
BFEB             ; ---------------------------------------------------------------------------

BFFF: 1B B0	; ROM checksum fix








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MAPPY-1B.BIN
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Offset		purpose

   new  => old


F3E6: 09 07  	; text color change to white in TEST page
F3F1: 09 07  	; text color change to white in TEST page
F404: 09 07 	; text color change to white in TEST page
F436: 09 07	; text color change to white in TEST page

F620: 07 03
F621: 00 60	; size of RAM test reduced from $700 to $360 bytes ( DON'T CLEAR HIGH SCORE RAM )


16B4: 09 07  	; text color change to white in TEST page
16B5: 09 07	; text color change to white in TEST page

1FEF: E2 92	; ROM checksum fix