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64 lines
902 B
ArmAsm
64 lines
902 B
ArmAsm
;===========================
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; Check Apple II model
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;===========================
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; this is mostly for IIc support
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; as it does interrupts differently
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; ' ' ($20) = Apple II
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; '+' ($2B) = Apple II+
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; 'E' ($45) = Apple IIe
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; 'C' ($43) = Apple IIc
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; 'G' ($47) = Apple IIgs
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detect_appleii_model:
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lda #' '
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ldx $FBB3
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; II is $38
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; J-plus is $C9
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; II+ is $EA (so is III)
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; IIe and newer is $06
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cpx #$38
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beq done_apple_detect
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lda #'+'
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cpx #$EA
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beq done_apple_detect
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; TODO: check for J-plus or III?
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cpx #$06
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bne done_apple_detect
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apple_iie_or_newer:
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ldx $FBC0 ; $EA on a IIe
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; $E0 on a IIe enhanced
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; $00 on a IIc/IIc+
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; $FE1F = $60, IIgs
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beq apple_iic
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lda #'E'
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cpx #$EA
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beq done_apple_detect
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cpx #$E0
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beq done_apple_detect
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; assume GS?
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lda #'G'
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bne done_apple_detect
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apple_iic:
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lda #'C'
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done_apple_detect:
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sta APPLEII_MODEL
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rts
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