Commodore Computer Commodore 64 Manuel d'utilisateur télécharger pdf (Page 59)

* STRUCTURE OF SINGLE DIRECTORY ENTRY

SEQUENTIAL FORMAT

PROGRAM FILE FORMAT

BYTE CONTENTS

DEFINITION

128+type

File type OR'ed with $80 to indicate properly

closed file.

TYPES:

0= DEleted

I = SEQential

2 = PROGram

3 = USER

4 = RELative

1-2 Track and sector of Ist data block.

3-18

File name padded with shifted spaces.

19-20

Relative file only: track and sector for first side

sector block.

Relative file only: Record size.

22-25

Unused.

26-27

Track and sector of replacement file when OPEN@

is in effect.

28-29

Number of blocks in file: low byte, high byte.

BYTE

DEFINITION

0.1

Track and sector of next sequential data block.

2-256

254 bytes of data with carriage return as record terminators.

BYTE

DEFINITION

0,1

Track and sector of next block in program me.

2-256

254 bytes of program info stored in CBMmemory format (with

key words tokenized). End of file is marked by three zero bytes.

1 2 ... 54 55 56 57 58 59 60 61 62 63 64 65

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Commodore Computer Commodore 64 Manuel d'utilisateur Page 59