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TABLE OF CONTENTS
25. 3.
1.
13
25.
3. 1. 14
25.3.1.15
IOCLSN
ICCECF
IOCRIB
Next LSN
LSN of end-of-file .
PSN of
RIB
Page
25.3. 1. 16
25.3.1.
17
25.3.
1. 18
25.3. 1. 19
25.3.
1.
20
IOCFDF
IOCDEN
IOCSBP
IOCSBS
loeSBE
File descriptor flags
Directory entry number
Sector buffer pointer
Sector
blJ~~er
start .
.
Sector buffer end .
.
.
25-26
25-26
25-26
25-26
25-30
25-31
25-31
25-31
25-32
25-32
25.3.1.21
IoeSBI
Internal buffer pointer
Reserve a device -- .RESRV
25.3.2
25. 3. 3
25. 3. 4
25.3.5
25. 3. 6
Open a file -- . OPEN.
Input a record -- . GETRC .
Output a record -
.PUTRC
Close a file -- . CLOSE.
25.3.7 Release a device -- . RELES
25.3.8 Example of device independent
110
25.3.9 Specialized diskette I/O functions
25.3.9.1 Input logical sectors -- . GETLS
25.3.9.2 Output logical sectors -- .PUTLS
25.3.9.3 Rewind file -- .
REWND
. . . .
25.3.9.4 Example of logical sector I/O
25.3.10 Error handling
. . . . .
.
25-34
25-39
25-42
25-45
·
25-48
25-49
· 25-51
25-51
25-54
25-56
· 25-58
25-62
26.
INPUT/OUTPUT
PROVISIONS
FOR
NON-SUPPORTED
DEVICES
26-01
26. 1 Devi c e Dep end ent I/O .
26.2 Device Independent
IIO
26.2. 1
Cont~oller
Descripto.r Block --
CDB
26.2.
1.
1 CDBIOe
CLlrrent IOCB
add1'ess
26. 2. 1.2 CDBSDA
50~tware
driver address
26. 2. 1. 3
CDBHAD
Hardware
address .
.
.
.
26.2.1.4 CDBDDF
Device descriptor flags
26.2.1.5 CDBVDT
Valid data types
26.2.1.6 CDBDDA
Device dependent area
26.2. 1.7 CDBWST
Working storage
26.2.2 Device
drivers . .
26.2.3 Example of device driver . .
26.2.4 Adding a non-standard device
26-01
26-01
26-01
26-04
26-04
26-04
26-04
26-07
26-08
26-08
26-08
26-10
26-13
P
ag e
xi
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