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_dio_open and _dio_close functions

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git-svn-id: svn://svn.cc65.org/cc65/trunk@374 b7a2c559-68d2-44c3-8de9-860c34a00d81
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cpg 2000-10-16 23:24:24 +00:00
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libsrc/atari/diopncls.s Normal file
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;
; Christian Groessler, October 2000
;
; This file provides the __dio_open and __dio_close functions
; Since on the Atari no real open and close is necessary, they
; do not much. The __dio_open queries the sector size of the
; drive which is later used by the _dio_read and _dio_write
; functions.
;
; unsigned char __fastcall__ _dio_open (_driveid_t drive_id);
; unsigned char __fastcall__ _dio_close (_driveid_t drive_id);
;
.export __dio_open,__dio_close
.export sectsizetab
.include "atari.inc"
.bss
sectsizetab:
.res NUMDRVS * 2
.code
.proc __dio_open
asl a ; make index from drive id
tax
lda #128 ; currently hardcoded (until I get an 815 :-)
sta sectsizetab,x
lda #0
sta sectsizetab+1,x
; fall thru to __dio_close
.endproc
.proc __dio_close
lda #0
tax
rts ; return no error
.endproc