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153 lines
1.8 KiB
ArmAsm
153 lines
1.8 KiB
ArmAsm
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; Christian Groessler, July 2004
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; from Freddy Offenga's rominfo.c
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;
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; unsigned char get_ostype(void)
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;
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; x x x x x x x x - 8 bit flag
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; | | | | | | | |
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; | | | | | +-+-+-- main OS rev.
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; | | +-+-+-------- minor OS rev.
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; +-+-------------- unused
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;
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; main OS rev.:
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; 000 - unknown
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; 001 - 400/800 ROM
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; 010 - 1200XL ROM
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; 011 - XL/XE ROM
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; 1xx - unassigned
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; minor OS rev.: (depending on main OS rev.);
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; 400/800:
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; 000 - unknown
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; 001 - Rev. A PAL
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; 010 - Rev. B PAL
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; 011 - Rev. A NTSC
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; 100 - Rev. B NTSC
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; 101 - unassigned (up to 111)
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; 1200XL:
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; 000 - unknown
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; 001 - Rev. 10
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; 010 - Rev. 11
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; 011 - unassigned (up to 111)
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; XL/XE:
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; 000 - unknown
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; 001 - Rev. 1
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; 010 - Rev. 2
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; 011 - Rev. 3
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; 100 - Rev. 4
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; 101 - unassigned (up to 111)
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;
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.export _get_ostype
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.proc _get_ostype
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lda $fcd8
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cmp #$a2
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beq _400800
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lda $fff1
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cmp #1
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beq _1200xl
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lda $fff7
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cmp #1
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bcc _unknown
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cmp #5
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bcs _unknown
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;XL/XE ROM
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sec
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asl a
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asl a
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asl a
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and #%00111000
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ora #%11
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_fin: ldx #0
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rts
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; unknown ROM
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_unknown:
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lda #0
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tax
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rts
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; 1200XL ROM
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_1200xl:
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lda $fff7 ; revision #
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cmp #10
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beq _1200_10
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cmp #11
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beq _1200_11
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lda #0 ; for unknown
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beq _1200_fin
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_1200_10:
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lda #%00001000
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bne _1200_fin
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_1200_11:
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lda #%00010000
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_1200_fin:
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ora #%010
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bne _fin
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; 400/800 ROM
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_400800:
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lda $fff8
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ldx $fff9
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cmp #$dd
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bne _400800_1
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cpx #$57
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bne _400800_unknown
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; 400/800 NTSC Rev. A
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lda #%00011001
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bne _fin
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; 400/800 unknown
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_400800_unknown:
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lda #%00000001
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bne _fin
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_400800_1:
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cmp #$d6
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bne _400800_2
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cpx #$57
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bne _400800_unknown
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; 400/800 PAL Rev. A
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lda #%00001001
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bne _fin
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_400800_2:
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cmp #$f3
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bne _400800_3
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cpx #$e6
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bne _400800_unknown
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; 400/800 NTSC Rev. B
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lda #%00100001
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bne _fin
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_400800_3:
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cmp #$22
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bne _400800_unknown
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cpx #$58
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bne _400800_unknown
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; 400/800 PAL Rev. B
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lda #%00010001
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bne _fin
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.endproc
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