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The constructors are _NOT_ allowed anymore to access the BSS. Rather they must use the DATA segment or the INIT segment. The latter isn't cleared at any point so the constructors may use it to expose values to the main program. However they must make sure to always write the values as they are not pre-initialized.
49 lines
1.1 KiB
ArmAsm
49 lines
1.1 KiB
ArmAsm
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; Oliver Schmidt, 08.03.2004
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;
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; Identify DOS version we're running on as one of these:
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;
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; AppleDOS 3.3 - $00
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; ProDOS 8 1.0.1 - $10
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; ProDOS 8 1.0.2 - $10
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; ProDOS 8 1.1.1 - $11
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; ProDOS 8 1.2 - $12
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; ProDOS 8 1.3 - $13
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; ProDOS 8 1.4 - $14
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; ProDOS 8 1.5 - $15
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; ProDOS 8 1.6 - $16
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; ProDOS 8 1.7 - $17
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; ProDOS 8 1.8 - $18
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; ProDOS 8 1.9 - $18
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; ProDOS 8 2.0.1 - $21
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; ProDOS 8 2.0.2 - $22
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; ProDOS 8 2.0.3 - $23
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;
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.constructor initdostype, 25
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.export __dos_type
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.include "mli.inc"
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; Identify DOS version according to:
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; - Beneath Apple ProDOS, chapter 6-63
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; - Apple II ProDOS 8 TechNote #23, ProDOS 8 Changes and Minutia
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; - ProDOS TechRefMan, chapter 5.2.4
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.segment "ONCE"
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initdostype:
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lda $BF00
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cmp #$4C ; Is MLI present? (JMP opcode)
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bne done
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lda KVERSION ; ProDOS 8 kernel version
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cmp #$10
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bcs :+
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ora #$10 ; Make high nibble match major version
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: sta __dos_type
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done: rts
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.data
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__dos_type: .byte $00
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