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8476360e9f
* Trying to open an unused drive would leave a byte on the hardware stack. * Too high device numbers weren't caught.
86 lines
1.9 KiB
ArmAsm
86 lines
1.9 KiB
ArmAsm
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; 2001-07-02, Maciej 'YTM/Elysium' Witkowiak
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; 2015-08-24, Greg King
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;
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; based on Atari version by Christian Groessler
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;
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; dhandle_t __fastcall__ dio_open (unsigned char device);
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; unsigned char __fastcall__ dio_close (dhandle_t handle);
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;
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; dio_open sets given device as current and initializes disk
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; dio_close does nothing special
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.export _dio_open, _dio_close
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.import __oserror, _OpenDisk
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.importzp ptr1, tmp1
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.include "dio.inc"
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.include "jumptab.inc"
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.include "geossym.inc"
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.include "const.inc"
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.bss
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sectsizetab:
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.res 4 * sst_size ; this is hardcoded
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.code
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_dio_open:
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cmp #4
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bcs _inv_drive
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tax
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lda driveType,x ; check if there's a device
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beq _inv_drive
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txa
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pha
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clc
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adc #8 ; normalize devnum
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sta curDevice
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jsr SetDevice
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jsr _OpenDisk ; take care for errors there
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pla
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tay ; drive #
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asl a ; make index from drive id
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asl a
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tax
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lda #0
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sta sectsizetab+sst_sectsize,x
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lda #128
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sta sectsizetab+sst_flag,x ; set flag that drive is "open"
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lda #1
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sta sectsizetab+sst_sectsize+1,x
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tya
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sta sectsizetab+sst_driveno,x
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stx tmp1
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lda #<sectsizetab
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clc
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adc tmp1
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sta tmp1
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lda #>sectsizetab
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adc #0
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tax
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lda tmp1
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rts
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_inv_drive:
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lda #DEV_NOT_FOUND
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sta __oserror
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lda #0
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tax
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rts
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_dio_close:
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sta ptr1
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stx ptr1+1
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lda #0
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ldy #sst_flag
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sta (ptr1),y
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sta __oserror ; success
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tax
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rts ; return no error
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