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62eb3137ab
Do not check $fbbe when detecting the Apple //e card. This byte is a version number for the Apple //e card according to misc technote #7 and it appears that the last version of the software that I am aware of has a 3 at this location. Prior to this change, Apple //e cards which we not version 0 would be detected as an Apple //e enhanced.
71 lines
2.1 KiB
ArmAsm
71 lines
2.1 KiB
ArmAsm
;
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; Oliver Schmidt, 04.01.2005
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;
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; unsigned char get_ostype (void)
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;
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.constructor initostype
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.export _get_ostype
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; Identify machine according to:
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; Apple II Miscellaneous TechNote #7, Apple II Family Identification
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.segment "ONCE"
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initostype:
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sec
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jsr $FE1F
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bcs nogs
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tya
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ora #$80
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done: sta ostype
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rts
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nogs: ldx #$FF
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next: inx
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lda value,x
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ldy index,x
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beq done ; $00 is no valid index
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cmp $FB00,y
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beq next
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: inx
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ldy index,x
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bne :-
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beq next ; Branch always
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index: .byte $B3, $00 ; Apple ][
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.byte $B3, $1E, $00 ; Apple ][+
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.byte $B3, $1E, $00 ; Apple /// (emulation)
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.byte $B3, $C0, $00 ; Apple //e
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.byte $B3, $C0, $DD, $00 ; Apple //e Option Card
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.byte $B3, $C0, $00 ; Apple //e (enhanced)
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.byte $B3, $C0, $BF, $00 ; Apple //c
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.byte $B3, $C0, $BF, $00 ; Apple //c (3.5 ROM)
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.byte $B3, $C0, $BF, $00 ; Apple //c (Mem. Exp.)
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.byte $B3, $C0, $BF, $00 ; Apple //c (Rev. Mem. Exp.)
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.byte $B3, $C0, $BF, $00 ; Apple //c Plus
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.byte $00
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value: .byte $38, $10 ; Apple ][
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.byte $EA, $AD, $11 ; Apple ][+
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.byte $EA, $8A, $20 ; Apple /// (emulation)
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.byte $06, $EA, $30 ; Apple //e
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.byte $06, $E0, $02, $40 ; Apple //e Option Card
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.byte $06, $E0, $31 ; Apple //e (enhanced)
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.byte $06, $00, $FF, $50 ; Apple //c
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.byte $06, $00, $00, $51 ; Apple //c (3.5 ROM)
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.byte $06, $00, $03, $53 ; Apple //c (Mem. Exp.)
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.byte $06, $00, $04, $54 ; Apple //c (Rev. Mem. Exp.)
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.byte $06, $00, $05, $55 ; Apple //c Plus
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.byte $00
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.code
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_get_ostype:
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lda ostype
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ldx #$00
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rts
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.segment "INIT"
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ostype: .res 1
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