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54 lines
914 B
ArmAsm
54 lines
914 B
ArmAsm
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; Oliver Schmidt, 2012-10-17
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;
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.export diskinit
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.import opencmdchannel, closecmdchannel
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.import writefndiskcmd, readdiskerror
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.import isdisk, fnunit, fncmd
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;------------------------------------------------------------------------------
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; diskinit
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.proc diskinit
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; Save device
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sta fnunit
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; Check for disk device
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tax
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jsr isdisk
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bcc open
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lda #9 ; "Illegal device"
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rts
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; Open channel
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open: jsr opencmdchannel
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bne done
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; Write command
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lda #'i' ; Init command
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sta fncmd
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jsr writefndiskcmd
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bne close
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; Read error
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ldx fnunit
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jsr readdiskerror
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; Close channel
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close: pha
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ldx fnunit
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jsr closecmdchannel
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pla
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done: rts
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.endproc
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