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33 lines
1.4 KiB
Plaintext
33 lines
1.4 KiB
Plaintext
// Routines from C64 KERNAL ROM
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// CHROUT. Write byte to default output. (If not screen, must call OPEN and CHKOUT beforehands.)
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// Input: A = Byte to write.
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asm void putchar(byte a) @$FFD2 extern
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// OPEN. Open file. (Must call SETLFS and SETNAM beforehands.)
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asm void open() @$FFC0 extern
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// CLOSE. Close file.
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// Input: A = Logical number.
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asm void close(byte a) @$FFC0 extern
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// SETLFS. Set file parameters.
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// Input: A = Logical number; X = Device number; Y = Secondary address.
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asm void setlfs(byte a, byte x, byte y) @$FFBA extern
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// SETNAM. Set file name parameters.
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// Input: A = File name length; X/Y = Pointer to file name.
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asm void setnam(word yx, byte a) @$FFBA extern
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// LOAD. Load or verify file. (Must call SETLFS and SETNAM beforehands.)
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// Input: A: 0 = Load, 1-255 = Verify; X/Y = Load address (if secondary address = 0).
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// Output: Carry: 0 = No errors, 1 = Error; A = KERNAL error code (if Carry = 1); X/Y = Address of last byte loaded/verified (if Carry = 0).
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asm clear_carry load(byte a, word yx) @$FFD5 extern
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// SAVE. Save file. (Must call SETLFS and SETNAM beforehands.)
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// Input: A = Address of zero page register holding start address of memory area to save; X/Y = End address of memory area plus 1.
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// Output: Carry: 0 = No errors, 1 = Error; A = KERNAL error code (if Carry = 1).
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asm clear_carry save(byte a, word yx) @$FFD5 extern
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word irq_pointer @$314
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