Commodore Computer Commodore 64 Manual de usuario descargar pdf (Pagina 28)

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Table 5.3: DIRECTORY FORMAT

*STRUCTURE OF SINGLE DIRECTORY ENTRY

Track

18,Sector1for4040

Track 39, Sector 1 for 8050

BYTE

DEFINITION

0,1

Track and sector of next directory block.

2-31

*File entry 1

34-63

*File entry 2

66-95

*File entry 3

98-127

*File entry 4

130-159

*File entry 5

162-191

*File entry 6

194-223

*File entry 7

226-255

*File entry 8

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 1st 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(a)is in

effect.

28,29

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

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 ... 64 65

VIC-154'1 I 1
VIC-1541 2
.. . ... .. 4
.. .. . .. . .. .. 4
.. .. .. . .. .. . 34 5
1. GENERAL DESCRIPTION 6
I/O. internal timers 8
_single drive 9
---_.--_.-.---._-_ 10
WHEN COVERED. DISKETTE 11
CONTENTS CANNOT BE 11
AL TERED 11
3. USING PROGRAMS 12
FORMAT FOR THE LOAD COMMAND: 13
EXAMPLES 13
LOAD "TEST", 8 13
FORMAT FOR PATTERN MATCHING: 15
FORMAT FOR THE SAVE COMMAND: 15
FORMAT FOR VERIFY COMMAND: 16
4: DISK COMMANDS 17
OPEN2,8. 2 C-- ~~ 18
INITIALIZE 20
VALIDATE 20
FOR VALIDATE COMMAND: 21
DUPLICATE 21
30 PRINT A$, B$, C$, D$ ~ 21
FORMAT FOR CLOSE STATEMENT: 21
5. SEQUENTIAL FILES 22
PRINT#andINPUT# 23
FORMAT FOR INPUT#STATEMENT: 24
EXAMPLES OF GET#STATEMENT: 25
- Causes 26
="REL" 26
=available block 27
18,Sector1for4040 28
6. RANDOMFILES 29
~ ~ - LOCK 31
10OPEN15.8,15 32
20 OPEN5,8,5, "# DRIVE 32
SEQUENTIALFILE: 33
4 RECORDS EACH: 35
7. RELATIVEFILES 36
Record Length 37
38
TOTAL 100 38
- 256°R2 39
BLOCK.EXECUTE 40
FORMAT FOR BLOCK-EXECUTE: 40
MEMORY.READ 40
FORMAT FOR MEMORY-WRITE: 41
MEMORY-EXECUTE 41
15,"03" 42
Hardware Method 43
=Block Availability Map 48
2. VIEW SAM 50
:GOT066e 51
:24=24+1:GOT066a 51
3. DISPLAYT&S 52
6713REM* CHARACTER * 53
4. CHECK DISK 54
IF TI(NTTHENI37e 55
PRun"READum DATA" 56
APPENDIX D: DISK FORMATS 57
Not to scale 57
SEQUENTIAL FORMAT 59
PROGRAM FILE FORMAT 59
2 = PROGram 59
INTRODUCTION 62
"RO:new name. . 65

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Commodore Computer Commodore 64 Manual de usuario Pagina 28

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