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50 lines
623 B
ArmAsm
50 lines
623 B
ArmAsm
;
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; Freddy Offenga & Christian Groessler, August 2003
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; detect the DOS version we're running on
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;
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.include "atari.inc"
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.constructor detect,26
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.export __dos_type
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; DOS type detection
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detect: lda #ATARIDOS
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sta __dos_type ; set default
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lda DOS
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cmp #'S' ; SpartaDOS
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beq spdos
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cmp #'M' ; MyDOS
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beq mydos
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ldy #COMTAB
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lda #$4C
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cmp (DOSVEC),y
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bne done
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ldy #ZCRNAME
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cmp (DOSVEC),y
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bne done
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ldy #6 ; OS/A+ has a jmp here
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cmp (DOSVEC),y
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beq done
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lda #OSADOS
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sta __dos_type
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bne done
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spdos: lda #SPARTADOS
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sta __dos_type
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done: rts
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mydos: lda #MYDOS
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sta __dos_type
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rts
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.bss
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__dos_type: .res 1
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