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TABLE OF CONTENTS
24.
SYSTEM DESCRIPTION. .
25.
24.1 Diskette Structure
24; 1. 1 Diskette Identification Block
24.1.2 Cluster Allocation Table.
24.1.3 Lockout Cluster Allocation Table . .
24, 1. 4 Di
ree tory
24.1. :; Bootblock
24.2 File Structure.
24.2.1 Retrieval Information Block
24.2.2 File
formats . .
24.3 Record Structure . .
24.3. 1
Binar~
records
24.3.2 ASCII records
24. 3.3
ASCII-CQnve~ted-binaTY
records
24.3.4 File descriptor records
24.4 System Files
24.4.1 System overlays
24.4.2 System error message file
24. 5 Memorq Map , . .
.
.
.
24.6 MDOS Command Interpreter
24.7
Interrupt Handling.
24.8 System
Fun~tion
Calls
24.9 MOOS Equate File.
INPUT/OUTPUT
FUNCTIONS
FOR SUPPORTED DEVICES
25.1
Supported Devices'
25.2 Device Dependent I/O Functions
25.2.1 Console input -- .KEYIN
25.2.2 Check for BREAK key -- .CKBRK
25.2.3 Console output -- .
DSPLY,
.
DSPLX,
.DSPLZ
25.2.3. 1 Examp Ie aT console lID . .
25.2.4 Printer output ...- . PRINT,
. PRINX
25.2.4.1 Example
oT
printel' output
25.2.5 Physical sectoT input -- . DREAD,
.EREAD
25.2.6 Physical sectoT output -- . DWRIT,
. EWRIT
25.2.7 Multiple sector input -- . MREAD,
.MERED
25.2.8 Multiple
secto~
output -- . MWRIT,
.
MEWRT
25.2.9 Diskette controller entry points
25.3 Device Independent IIO Functions .
25. 3. 1 1/0 Contro 1
Bloc k -- IOCB
25.3.1.1 IOCSTA
Error status
25.3. 1. 2
ICCDTT
Data tl"ans-Per
type
25_ 3_
1.
3
IOCnSp
Data
burrel' pointel'
25.3.
1.
4 lOCDBS
Data
bUTTer
stal't
25. 3.
1.
5
IOCOBE
Data
bUrrel' end
25.3.
1.
6
IOCGDW
Generic device word
25. 3. 1. 7
IOCLUN
Logical uni t number
25.3.
1.
8
IOCNAM
File
name
25.3.
1.
9 IOCSUF
Suffix
25.3.
1.
lQ
IOCMLS
Maximum LSN referenced
25. 3. 1. 11
IOCSDW
Current
SDW
25.3. 1. 12
IOCSLS
Starting
LSN of SDW
Page
24-01
24-01
24-02
24-03
24-03
24-04
24-06
24-07
24-07
24-10
24-11
24-11
24-12
24-13
24-14
24-15
24-16
24-17
24-17
24-20
24-21
24-23
24-25
25-01
25-01
25-01
25-02
25-04
25-05
25-06
25-07
25-08
25-09
25-11
25-12 .
25-13
25-13
25-13
25-14
25-18
25-19
25-22
25-22
25-23
25-23
25-23
25-24
25-24
25-25
25-25
25-25
Page
x
,.
---')
-'.
~.,/'
\
I
.. . /
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