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53 lines
812 B
ArmAsm
53 lines
812 B
ArmAsm
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; Maciej 'YTM/Elysium' Witkowiak
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; 2.7.2001
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;
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; this function is used by dio_read and dio_write to fix parameters (secnum)
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; this function calls SetDevice so that more than one drive can be used at once
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.import popax,pushax,_dio_log_to_phys
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.importzp ptr1
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.export dio_params,dio_secnum
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.include "geossym.inc"
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.include "jumptab.inc"
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.include "dio.inc"
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.bss
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dio_secnum:
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.res 2
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.code
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dio_params:
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sta r4L
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stx r4H
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jsr popax
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sta dio_secnum
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stx dio_secnum
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jsr popax ; get 3rd parameter
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pha ; save it
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txa
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pha
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jsr pushax ; put it back
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pla ; restore it
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sta ptr1+1
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pla
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sta ptr1
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ldy #sst_driveno
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lda (ptr1),y
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clc
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adc #8
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jsr SetDevice ; setup device, load driver
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lda #<dio_secnum
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ldx #>dio_secnum
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jsr pushax
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lda #<r1L
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ldx #>r1H
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jmp _dio_log_to_phys
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