44 lines
931 B
ArmAsm
44 lines
931 B
ArmAsm
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;;
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;; Official Kernal routine, described in:
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;;
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;; - [RG64] C64 Programmer's Reference Guide - page 281/282
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;; - [CM64] Compute's Mapping the Commodore 64 - page 229/230
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;;
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;; CPU registers that has to be preserved (see [RG64]): none
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;;
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close:
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;; XXX this needs more testing (opening 10 files at once, closing in various orders, etc) once the code is more mature
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;; Find the LAT / SAT / FAT entry which LAT corresponds to A
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jsr find_fls
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bcs close_error_not_found ;; XXX can we report error in IOSTATUS here?
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;; We have the entry index in Y
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;; XXX some devices (like IEC) needs special support here, to free their internal resources!
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;; Just make sure the Y register value is kept, or redo ldy DFTLN
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*
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iny
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cpy #$0A
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bpl +
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lda LAT, y
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sta LAT-1, y
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lda FAT, y
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sta FAT-1, y
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lda SAT, y
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sta SAT-1, y
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jmp -
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*
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;; Decrement the list size variable
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dec LDTND
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;; FALLTHROUGH - success
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close_error_not_found:
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rts
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