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70 lines
1.6 KiB
ArmAsm
70 lines
1.6 KiB
ArmAsm
;
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; Freddy Offenga, Stefan Haubenthal, Christian Groessler, March 2007
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;
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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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; ------------------------------------------------------------------------
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; DOS type detection
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.segment "ONCE"
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detect: 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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cmp #'X' ; XDOS
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beq xdos
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cmp #'R' ; RealDOS
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beq rdos
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lda #$4C ; probably default
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ldy #COMTAB
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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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bne set
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spdos: lda DOS+3 ; 'B' in BW-DOS
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cmp #'B'
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bne spdos_real
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lda DOS+4 ; 'W' in BW-DOS
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cmp #'W'
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bne spdos_real
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lda #BWDOS
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.byte $2C ; BIT <abs>
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spdos_real:
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lda #SPARTADOS
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.byte $2C ; BIT <abs>
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mydos: lda #MYDOS
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.byte $2C ; BIT <abs>
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rdos: lda #REALDOS
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.byte $2C ; BIT <abs>
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xdos: lda #XDOS
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set: sta __dos_type
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done: rts
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; ------------------------------------------------------------------------
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; Data
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.data
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__dos_type: .byte ATARIDOS; default to ATARIDOS
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