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cc65/libsrc/atari/ostype.s
cpg badf78999f added PAL/NTSC check for 1200xl + XL/XE systems
git-svn-id: svn://svn.cc65.org/cc65/trunk@162 b7a2c559-68d2-44c3-8de9-860c34a00d81
2000-07-17 00:30:01 +00:00

184 lines
2.3 KiB
ArmAsm

;
; Christian Groessler, July 2000
; from Freddy Offenga's rominfo.c
;
; unsigned int get_ostype(void)
;
; x x x x x x x x x x x x x x x x - 16 bit flag
; | | | | | | | | | | | | | | | |
; | | | | | | | | | | | | | +-+-+-- main OS rev.
; | | | | | | | | | | | +-+-------- PAL/NTSC flag
; | | | | | | | | +-+-+------------ minor OS rev.
; +-+-+-+-+-+-+-+------------------- unused
;
; main OS rev.:
; 000 - unknown
; 001 - 400/800 ROM
; 010 - 1200XL ROM
; 011 - XL/XE ROM
; 1xx - unassigned
; PAL/NTSC flag:
; 00 - unknown
; 01 - PAL
; 10 - NTSC
; 11 - (invalid)
; minor OS rev.: (depending on main OS rev.);
; 400/800:
; 000 - unknown
; 001 - Rev. A
; 010 - Rev. B
; 011 - unassigned (up to 111)
; 1200XL:
; 000 - unknown
; 001 - Rev. 10
; 010 - Rev. 11
; 011 - unassigned (up to 111)
; XL/XE:
; 000 - unknown
; 001 - Rev. 1
; 010 - Rev. 2
; 011 - Rev. 3
; 100 - Rev. 4
; 101 - unassigned (up to 111)
;
.include "atari.inc"
.export _get_ostype
.importzp tmp1
.proc _get_ostype
lda $fcd8
cmp #$a2
beq _400800
lda $fff1
cmp #1
beq _1200xl
lda $fff7
cmp #1
bcc _unknown
cmp #5
bcs _unknown
;XL/XE ROM
sec
asl a
asl a
asl a
asl a
asl a
and #%11100000
ora #%11
_fin_xl:sta tmp1
lda PALNTS ; get OS PAL/NTSC flag (0 = NTSC, 1 = PAL)
beq _xl_ntsc
cmp #1
beq _xl_pal
lda #0
beq _fxlcont
_xl_ntsc:
lda #%10
bne _fxlcont
_xl_pal:lda #1
_fxlcont:
asl a
asl a
asl a
ora tmp1
_fin: ldx #0
rts
; unknown ROM
_unknown:
lda #0
tax
rts
; 1200XL ROM
_1200xl:
lda $fff7 ; revision #
cmp #10
beq _1200_10
cmp #11
beq _1200_11
lda #0 ; for unknown
beq _1200_fin
_1200_10:
lda #%00100000
bne _1200_fin
_1200_11:
lda #%01000000
_1200_fin:
ora #%010
bne _fin_xl
; 400/800 ROM
_400800:
lda $fff8
ldx $fff9
cmp #$dd
bne _400800_1
cpx #$57
bne _400800_unknown
; 400/800 NTSC Rev. A
lda #%00110001
bne _400800_done
; 400/800 unknown
_400800_unknown:
lda #%00000001
bne _400800_done
_400800_1:
cmp #$d6
bne _400800_2
cpx #$57
bne _400800_unknown
; 400/800 PAL Rev. A
lda #%00101001
bne _400800_done
_400800_2:
cmp #$f3
bne _400800_3
cpx #$e6
bne _400800_unknown
; 400/800 NTSC Rev. B
lda #%01010001
bne _400800_done
_400800_3:
cmp #$22
bne _400800_unknown
cpx #$58
bne _400800_unknown
; 400/800 PAL Rev. B
lda #%01001001
_400800_done:
bne _fin
.endproc