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Contents

TELETYPE TABLES--- 9 EQUIPMENT TABLE--- 12 CORE MAP---

DISC ORGANIZATION---

SCHEDULING---

COMMUNICATION BETWEEN SYSTEM

MODULES---DISC DRIVER--- 20 I/O PROCESSOR DRIVERS--- 22 SYSTEM CONSOLE DRIVER--- 25 INPUT AND TERMINATION REQUESTS--- 26 SYSTEM FLOWCHARTS--- 27 SYSTEM LIBRARY ROUTINES--- 51 SYSTEM LIBRARY FLOWCHARTS--- 98

I/O PROCESSOR PROGRAM---MULTIPLEXOR --- 134

INPUT PROCESSING SECTION--- 135

SETIN---·--- 136

ABORT PROCESSING SECTION---

137

INPUT PROCESSING SECTION--- 138

LADDR

SECTION---~---

139 MPXIO SECTION--- 140

PHONES TIMING---

141

INITIALIZATION--- 142 POWER FAIL AND RECOVERY--- 142 TELETYPE TABLES--- 143 HARDWARE CONFIGURATION--- 148 PROCESSOR INTERCONNECT--- 149 TWO PROCESSOR POWER FAIL CHARACTERISTICS--- 152 I/O PROCESSOR CORE

MAP---~---

155 I/O PROCESSOR FLOWCHARTS--- 156 LOADER--- 164 LOADER FLOWCHART--- 165

BASIC---SYNTAX--- 171 COMPILATION--- 171 VALUE--- 172 DECOMPILATION--- 173

FR~ST---

1/3

EXECUTION--- 173 ERROR ROUTINES--- 182 CORE MAPS--- 123 INTERNAL REPRESENTATION--- 186 VARIABLE STORAGE ALLOCATION--- 191 FILE TABLE ENTRY--- 193 FILE CONTENTS--- 193 RUN-TIME STACKS---

19L:

LANGUAGE PROCESSOR TABLES--- 196

BASIC FLOWCHARTS--- 197

BASIC SyNTAX--- 221

L/O

1..

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1/0

1/- IA

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15-

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1

fJTRODUCT ION

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2000B TIME SHARED BASIC TABLES

DIREC contains information on the directory itself.

WORD

-" ~

',-II.

- - - -

lJNW£K---rou t i nes--that--these--trackshave -spec ia 1-- -s i g" ~ f-icance-~

At the end of the ADT is one additional entry having the form:

c:J

r

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IV. FUSS

The FUSS table is a ^J;2.~~ word table which resides on the disc. Its disc address can be obtained by the instruction.

LOA FUSS, 1

g

FUSS is divided into ~ sections of ~ words each.

/1»D J')u:. U,VC-T"':'

in each section are the disc addresses~of the user files

S"

The ~ vJOr'ds currsntly being accessed by the user corresponding to that table. Addresses of 0 indicate

BIT IS; OF I? FILE LEN': ,f) !A./cX'D

no file. ei-sc addresses ~1itA bit 7="t indicatesthat the user has read only access.

The purpose of maintaining this table is to:

1.) Prevent simultaneous write access by two users to one file;

2.) Prevent KILLing a file when some user has access to it.

A user's FUSS (i .e. his area of the FUSS table) is set by the FILES routine, which is called from BASIC at the beginning of execution of a program containing a FILES statement. It is cleared by BYE, HELLO, KILLIO, and sometimes by KILL.

v.

^COMTABLE executed immediately by the system

codes for commands which.are executed by

VI. LOGGR

3::<

LOGGR is a -61i-word queue \</hich contains codes for printing

LOGON/OFF messages. Entries are placed on the queue by HELLO,BYE, and SLEEP. Each entry consists of 2 words, with the following format:

WORD

0:

1 :

user id (BIT 15=0 for ON, 1 for OFF) bits 15-5 = 60 x hrs + mins

bits 4-0 = termlnal number

The representation of a user id is as follows:

BITS 14-10 = letter (A = I, B = 2, •.. , Z:= 328) BITS 9-0 number (0-999)

The following variables are relevant:

LOGeT = # of unprocessed entries in LOGGR

LOGP1 points to v:ord of last processed entry LOGP2 points to I</ord of last unprocessed enIIY Note that LOGCT

o

^<=> LOGP1=LOGP2

8 iJ

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DISC:

schedul ing for further information.

this is set, when a user is placed on the queue,

>4,

command processing

When a command is being processed, STAT indicates the command. STAT discussion or. schedul ing for further information.

PlEV: this word gives the priority level of the user when he is on the queue. When the user's status is set to 2 or 3, the previous value of STAT is copied into PLEV, and the user removed from the queue. The possible values of PLEV are as follows:

0: highest priority, used for syntax, users returning from

I/O

suspend, and for disc resident routines once they begin.

This includes FILES and CHAIN.

J: used for commands RUN,LIST,PUNCH

2: used for disc resident routines until they reach the top of the queue

4:

used for long running programs.

-fff-ft+: ..tl:le lellgttr of ~1me in SeeeRe-b-t.j;o.at it tee.k-t~'~~

~-n)~~dt"C1ne~

Associated with each item in these tables is a symbol which is

to the>

7FLAG EQU 0 7TNUM EQU

•

.

7RTIM EQU 15

i t",m- p)(.:>mnlp.·

--.~ ·r

-These symbols are primarily used for adjusting pointers to the table. For example, if the B register contains a pointer to the LINK entry of some USer, the instruction

ADB

.+7

ID -

7

LINK will point B to his ID entry.

is a symbol located in base page at the 0 entry of a table of con-stants from -26 to +