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Document:	VAX 11/750 Self Maintenance Diagnostic Guide
Order Number:	EK-750YA-UG
Revision:	001
Pages:	40
Original Filename:

OCR Text

etS,BTTSTYRetSRotTiooB

elf Maintenance
D nostic Guide

EK-750YA-UG-001

VAXI1/750
Self Maintenance
Diagnostic Guide

digital equipment corporation ®¢ maynard, massachusetts

1st Edition, February 1981

Copyright © 1981
by Digital Equipment Corporation.
All Rights Reserved.
The reproduction of this material, in part or
whole, is strictly prohibited. For copy information, contact the Educational Services Department, Digital Equipment Corporation, Maynard,
Massachusetts 01754.
The information in this document is subject to
change without notice. Digital Equipment
Corporation assumes no responsibility for any
errors that may appear in this manual.

Printed in U.S.A.

The following are trademarks of Digital
Equipment Corporation, Maynard, Massachusetts.

DECnet
DEC
DECsystem-10
DECUS
DECSYSTEM-20
DIGITAL
Digital Logo DECwriter
PDP
DIBOL
UNIBUS
EduSystem
VAX
IAS
MASSBUS

OMNIBUS
OS/8
PDT
RSTS
RSX
VMS
VT

CONTENTS
How Touse This Guide ......................... 1
VAX-11/750 System Operating States ............ 1
'VAX-11/750 Keyswitch Positions ................ 3
VAX-11/750 Panel Light Indicators .............. 3
DM Command Set.........oouiuuiiueeaneennnn., 3
DM Error Message Codes . ...................... 6
MICMON Commands ...............cccviuen... 8
MICMON Flags. ...t 9
VAX Console Commands ...................... 11
Command Modifiers for Examine and Deposit
Commands. ........coitiiiiii

DataType ................. P

Address Space.........
...
i12
Command Switches for Boot Command .......... 12
Boot Control Flags. . ..............
... ..o .. 12
Examples of VAX Console Commands .......... 13
Console Command Error Codes .. ............... 13
Example of Console Command Error ............ 14
Console Halt Error Codes ...................... 14

Console Halt Error Format ..................... 15
Power-Up Terminal Display Formats ............

Microverify Codes .. .....cov
it 16
VMB Primary Boot Failure Codes............... 18
System Control Block .. ........................ 19
Special Vector Bit Functions.................... 22

Vector Microaddresses ............ccoviuvnen... 22
Stack Contents on Selected VAX Exceptions .. ... 24
Machine Check............. ... 24
Summary Parameter Codes................ 24
Arithmetic Trap. .. ...... ... .. 25

ErrorCodes ............. ...

... 25

Compatibility Mode ... ...................... 25
ErrorCodes ..., 25
Translation Not Valid or Access Violation . .. .. 25

Error Codes ..., 26
VAX-11/750 Internal Processor Registers........ 26
FIGURES
1

VAX-11/750 Front Panel..................... 1

DM Operating State Transitions ............... 6

Memory Status and Control Maps ............ 27

HOW TO USE THIS GUIDE

This guide contains information needed for diagnosing VAX11/750 hardware problems. It does not tell how to solve these
problems, but does save looking through larger books for key
items you usually want to know.
First, scan the Table of Contents to find what areas are covered. Second, take this guide with you when diagnosing the
VAX-11/750. Unless you memorize the contents, this guide is
the easiest way to carry information needed to fix a computer
problem.

NOTE
The term DM in this guide refers to the diagnostic
module option on the VAX-11/750. The designation
for this option is KC750-YA. Ignore the parts of this
guide that refer to the DM if your system is not
equipped with the KC750-YA option.

VAX-11/750 SYSTEM OPERATING STATES
State

Description

Program /O

This is normal operating state of
VAX-11/750. CPU is running under
stored program control.

VAX console

CPU is under control of its own
console microcode. CPU console
commands are supported in this state.
Console prompt () ) )) is displayed by
terminal.

DM console
control mode

This is the same as program [/O state
if CPU is running except CTRL /D
changes system to DM console state
command mode; running program
supplies terminal prompt. If CPU is
halted, it is the same as VAX console
state where VAX console prompt ())))
is displayed.

System recognizes DM commands only.
command mode DM) prompt is displayed.
DM console

Microdiagnostic

DM is under control of microdiagnostic monitor (MICMON). MIC)
prompt is displayed.

QY1531QYH3IYHYD SLeviS3Y

®H3LONIY017nv4-QH@@@@g1HV1S3Y440Lonae

] L

31D0IA83G NOI-LHO3VMOd

3HOLIMSA

7 /i H3MOdNAHd¥OMI3zNVILING\Y 108\ JHno3s JunosVSLTSVYW
HOLVOIAN!

VAX-11/750 SELF MAINTENANCE DIAGNOSTIC

0XSLV/AiL SLHOIN

4H0O10L3I71M3S8

Ndd

0[2o1SPIL/unTegIyd-XgVA

VAX-11/750 SELF MAINTENANCE DIAGNOSTIC

VAX-11/750 KEYSWITCH POSITIONS
Position

Description

LOCAL SECURE

System only responds to local terminal.
Program I/O state is enforced.

LOCAL

System only responds to local terminal.
System responds to CTRL /D and
CTRL/P to change state.

REMOTE SECURE

Same as LOCAL SECURE

REMOTE

Same as LOCAL

VAX-11/750 PANEL LIGHT INDICATORS
Indicator

Description

POWER

Console is supplied with proper voltage.
(VAX-11/750 processor can lose partial
power and still light the LED and allow
diagnostic tests.)

REMOTE D

Not used

REMOTE

Not used

RD Fault

DM logic has failed. Fault LED should light
for about 10 seconds during console power-up
as part of logic self-test.

Run

Program is running in CPU.

RD TEST

Not used

ERROR

When blinking, this indicates control store
parity error. When on, it indicates double
control store parity error and CPU clock has
stopped.

RD CARRIER

Not used.

DM COMMAND SET

Command

Syntax

Clear

Function

Clear stop-onmicromatch

Deposit

D [/ modifier] [address] (data)

Deposit to
VAX memory

location

VAX-11/750 SELF MAINTENANCE DIAGNOSTIC

DM COMMAND SET (Cont)

Command

Syntax

Examine

E [/ modifier] [address]

Function
Examine VAX
memory

location

Examine-

E/C [address]

Console

Examine DM
status
registers

Initialize

INI

Initialize

Link

LIN

Enter link
control file

Load

LO (file name.ext) [address]

Load TUS8
file to VAX
memory

Micro-

UA (address)

address
Micro-

Load CS

address bus
UA/C (address)

address/C

Load CS
address bus
until next M

clock only

Parity

PAR (address)

Run control
store parity

check

Perform

PER

Perform link
control
files

RepeatLastCommand

REP

Repeat
console
command -

Repeat-

R (command)

Repeat

Next-

following
command

Command
Return

RET

Return to
program [ /O
state

Return/D

RET/D

Return to
DM

control mode

VAX-11/750 SELF MAINTENANCE DIAGNOSTIC
DM COMMAND SET (Cont)
Command

Syntax

Set

SE [address]

Function

Set stop-onmicromatch

Show

Show CPU
state

ShowVersion

SH/V

Show current
version of
DM firmware

Step

STE

Step through
single
micro-

instruction
Step-Tick

STE/T

Step through
single clock
tick

Stop

STO

Stop clock

Test

Load and run
microdiagnostics

Test-Com

TE/C

Load micromonitor and
await

command
Test-File

TE (file name.ext)

Load and run
user DM
program

Trace

Display
trace of CS
address.

VAX-11/750 SELF MAINTENANCE DIAGNOSTIC

KEYSWITCH
SECURE

POWER UP

Figure 2

MA-5111A

DM Operating State Transitions

DM ERROR MESSAGE CODES
Code

Definition

TAP:14

Tape — read length ERROR, not all records fit

TAP:13

Tape — flag received, not command or data

TAP:12

Tape — directory error

DM:11

Invalid operation code in macro

DM:10

Operation already in progress

TRM:0D

Terminal — length of input longer than buffer

TRM:0B

Terminal — command input buffer overloaded

TAP:09

Tape - file not found

TAP:08

Tape — invalid packet received

TAP:07

Tape — no end packet, invalid operation code
received

TAP:06

Tapc? — tape count byte received exceeds
maximum

TAP:05

Tape — tape checksum error received

VAX-11/750 SELF MAINTENANCE DIAGNOSTIC
DM ERROR MESSAGE CODES (Cont)
Definition

Code
NOTE

UARTSs are DM resident.

TAP:04

Tape UART - received overflow

TAP:03

Tape UART — data set ready dropped

TAP:02

Tape UART - error received from UART

TAP:01

Tape UART - device timed out

CPU:04

CPU UART - received overflow

CPU:03

CPU UART - data set ready dropped

CPU:02

CPU UART - error received from UART

CPU:01

CPU UART - dévice timed out

TRM:04

Terminal UART - received overflow

TRM:03

Terminal UART - data set ready dropped

TRM:02

Terminal UART - error received from UART

TRM:01

Terminal UART - device timed out

TAP:FF

Tape — diagnostic failure

TAP:EE

Tape — partial operation (end of medium)

TAP:F8

Tape — bad unit number

TAP:F7

Tape — no cartridge

TAP:F5

Tape — write protocol

TAP:EF

Tape — data check error

TAP:EO

Tape — see error (block not found)

TAP:DF

Tape — motor stopped

TAP:DO

Tape — bad operation code

TAP:C9

Tape — bad record number

SYNTAX

Error in entering console commands

ERROR

VAX-11/750 SELF MAINTENANCE DIAGNOSTIC

DM ERROR MESSAGE CODES (Cont)
Code

Definition

INVALID

DM does not recognize command

COMMAND
CMI:nn

Error in VAX main memory (two digits, nn, are
error code) Results from EXAMINE if area
addressed has error

CMI:00

Nonexistent memory

CMI:01

Corrected read data

CMI:02

Read data substitute

ROM

ROM failed DM power-up selftest

RAM

RAM failed DM power-up selftest

MICMON COMMANDS (DM equipped systems only)

The following commands are listed in alphabetical order. Enter

only the capitalized characters. Arguments in angle brackets
are mandatory. Arguments in square brackets are optional. Do
not type the brackets. When arguments are shown separated by
a slash line, you must type one of the arguments, but not both.
CLear CF: (dcs-address) (bit-number)

Clears specified (bit-number) in control file of (dcs-address).
CLear FLag (flag-name-list)

Clears (disables) specified program control flag.
CLear SOmm: [cs-address]
Clears stop-on micromatch function. To create a scope sync

pulse at a specified DCS address add 1800 to the desired DCS
address. If cs-address is specified, a scope sync pulse is generated on backplane slot 6 pin C81 when the current address
matches cs-address. Pulse occurs with M clock at beginning of

the specified CS-address.
COntinue
Continues execution of program, following error detection or
CTRL/C.
Dlagnose QV
DlIagnose PAss: (pass-count)
DIagnose TEst: (test-number) [test-number/COntinue]
Diagnose command initializes program control flags and starts
execution of a test program.

VAX-11/750 SELF MAINTENANCE DIAGNOSTIC

LOop

Puts program into error loop after it detects and reports an error.

REturn

Returns VAX-11/750 from MICMON to DM command mode.

SEt CF: (dcs-address) (bit-number)

Sets specified (bit-number) in control file of specified (dcs-ad-

dress).

SEt FLag (flag-name-list)

This command sets (enables) any program control flag.
SEt SOmm: (cs-address)

Stops execution of code in DCS at a specified DCS address.
SEt STep CYcle

Steps through DCS microinstructions one CPU machine cycle
(M clock) at a time.

SEt STep INstruction [:test-pc]

Steps through pseudo instructions in current test. If test-pc
specified, step function will not start until instruction at test-pc
is ready to be executed. If test-pc not specified, stepping begins
at next pseudo instruction of current test following a Loop or
Continue command.
SEt STep Tlck

Steps through DCS microinstructions one B clock at a time.

SHow FLags

Displays current states of program control flags.

SHow VBus

Displays current signal states on visibility bus.

MICMON FLAGS

Flag
HALT
LOOP

Description
Halt — Call the monitor when an error is detected and

the error message has been typed.

Loop on error — Only useful for program-detected

error. It is set by LOOP command. It can also be set
manually by typing SE FL LO. When it is set and
program detects an error, test loops on minimum
amount of cade necessary to recreate error. However,
when set manually, you must clear the HALT flag
and set the NER flag if program is to loop on error
continuously without error reports.

VAX-11/750 SELF MAINTENANCE DIAGNOSTIC

MICMON FLAGS (Cont)
Flag

Description

LOOP

The loop executed may include pseudo instructions

(Cont)

and DCS microinstructions, running from the
ERRLOOP instruction to the IFERROR instruction
in the failing test. Or the loop may include DCS
microinstructions only. If the IB flag is set, or if a
microinstruction trap occurs, the program will not

loop on the microinstructions in DCS. Error messages
are not inhibited while the loop is executing unless

the NER flag is set.

Type CTRL/C to escape from the loop and return to
monitor.
NER

No error report — If this flag is set, program does not
report errors.

BELL

Bell on error — If this flag is set, program rings
terminal bell on first occurrence of an error and on
every fifth occurrence.

Signature analysis — If this flag is set, program loops
on test in progress, between BEGINSA and ENDSA

pseudo instructions. Loop occurs whether test detects
errors or not. Set SA flag when signature analyzer is
used to help diagnose faults. This flag provides two

sync points on backplane: a start/stop window (slot 6,
pin C75); and a clock pulse (slot 6, pin C73). With
test looping and signature analyzer connected to sync
points, signature analyzer analyzes any test point that
the probe samples. Signature analyzer displays a
value (signature) if signal pattern is steady. Compare
this value with corresponding value from a known
good module to locate failures.
QA

Quality assurance — When this flag and the LOOP
flag are set, the program will not try to loop on DCS

microcode only. Instead, it will loop between the
ERLOOP and IFERROR pseudo instructions.
IB

Inhibit burst flag — When this flag and the LOOP
flag are set, the program will not attempt to loop only
on DCS microcode. Rather, it will loop between
ERRLOOP and IFERROR pseudo instructions.

Trace flag — When this flag is set, monitor prints test
names as well as numbers.

VAX-11/750 SELF MAINTENANCE DIAGNOSTIC

VAX CONSOLE COMMANDS

Function

Command

Enter VAX console

CTRL/P

state

Enter DM console

CTRL/D

state

E [/ modifier] [address]

Examine

D [/ modifier] [address] (data)

Deposit
Initialize processor

and UNIBUS

Test VAX by running
microverify

Start program in CPU

Continue microcode

execution at address
in PC

Single step CPU

‘N

through
macroinstruction
(after PC is loaded)

Boot CPU from

APT load and dump

device selected by
front panel device
switch

COMMAND MODIFIERS FOR EXAMINE AND DEPOSIT
COMMANDS
DATA TYPE

Modifier

Data Type

/B
/W
/L

Byte
Word
Longword

VAX-11/750 SELF MAINTENANCE DIAGNOSTIC

COMMAND MODIFIERS FOR EXAMINE
AND DEPOSIT COMMANDS (Cont)
ADDRESS SPACE

Modifier

Address Space
GPR
IPR

Physical memory
Virtual memory

(space)P

PSL

NOTE

When you type CTRL/P while system is already in
VAX console state, system responds with )))/
prompt.

COMMAND SWITCHES FOR BOOT COMMAND
Switch

Function

Boot device selected by front panel
switch; microverify inhibited.

/ nnnn

Boot device selected by front panel
switch; 4-digit argument becomes boot
control flags for VMB.EXE in RS.

(space) (device)

Boot device specified by operator

BOOT CONTROL FLAGS
Flag

Function

Conversational boot — Causes the system to ask for
various kinds of information during the boot procedure.
Debug — Causes the Executive Debugger to be included in the VMS running system.

Initial breakpoint — If this flag and the flag bit 1 flag
are set, causes a breakpoint to occur right after the Executive enables mapping.

Diagnostic boot — Causes a boot by filename for the
Diagnostic Supervisor.
Bootstrap breakpoint — Causes the bootstrap to stop at
breakpoints in VMB and SYSBoot.

VAX-11/750 SELF MAINTENANCE DIAGNOSTIC

BOOT CONTROL FLAGS (Cont)
Flag

Function

Image header — Causes the transfer address from the
image header of the boot file to be used. Otherwise,
control goes to the first byte of the boot file.

8
9

Memory test inhibit — Causes the bootstrap to ask for

the name of the boot file.

File name — Causes the bootstrap to ask for the name

of the boot file.

Halt before instruction — Causes a system halt prior to
transfer of control to the secondary boot file.

EXAMPLES OF VAX CONSOLE COMMANDS
Example

Explanation

)

Console prompt

yy»yD/G/L

1000(CR)

)))yD/P 1000 005251D0(CR)

YMWE/T

25(CR)

Put code in address 1000H

Examine cache disable
register

Initialize CPU

) )Y I{CR)
»))B/10/X

Put 1000H in PC

DMAO(CR)

BOOT diagnostic supervisor

without microverify from
DMAO

CONSOLE COMMAND ERROR CODES
Code

Description

Deposit or Examine of memory failed. (This$ could
mean one of following has occurred: access violation;
translation not valid; bus error; TB parity error; control
store parity error.)

Illegal access of an IPR

APT loading checksum error

Attempt to boot from unknown device type (DM, DL,

Boot device controller not A, B, C, or D.

DT, DR)

VAX-11/750 SELF MAINTENANCE DIAGNOSTIC

EXAMPLE OF CONSOLE COMMAND ERROR
Example

Description

y)Y)YE P(CR)

Examine PSL

Y)YE(CR)

Illegal attempt to examine next address

Illegal access of IPR

)

System ready for new command

CONSOLE HALT ERROR CODES
Code

Description

Execute TEST console

CTRL/P halt or single macro instruction mode

Interrupt stack not valid

Microverify test failure

Halt instruction executed

Vector bits (1:0) =3, halt at vector

Vector bits (1:0) =2, WCS disabled or not present

Change mode instruction executed on interrupt stack

Change mode instruction executed and vector
(1:0)not=0

Power up and can’t find RPB, FPS1 at

RESTART/HALT
12

Power up and warm start flag false FPS1 at

RESTART/HALT
13

Power up and can’t find good 64K of memory

Power up and booting, but bad or no Boot ROM

Power up and cold start flag set during boot

subroutine

Power up halt FPS1 at HALT position

VAX-11/750 SELF MAINTENANCE DIAGNOSTIC

CONSOLE HALT ERROR FORMAT
When the system enters the console state on a halt, it prints out

the PC and a 2-digit console halt error code.
Format

Description

00010003 06

Indicates halt instruction executed at address

)))

10003.

POWER-UP TERMINAL DISPLAY FORMATS
Display

Description

% %o

Power-up with power-on action switch

00000000 16

set to HALT. System passes power-on

)))

self-tests.

% F

Power-up with power-on action switch

00000nnn FF

set to HALT. F indicates failure of M
temp scratch pad test. Three-digit
hexadecimal number is current PC+2 and
points to failing test. (See microverify

codes.) FF indicates microverify
failure.

%%
% %

Power-up with power-on action switch in

nnnnnnnn 13

RESTART/BOOT or BOOT. Indicates a

)))

good 64 Kb section of memory was not
found and system returns to console
mode. Eight-digit code is PC+
2 and loop
count.
|

% % %%

Power-up with power-on action switch in

nnnnnnnn 14

RESTART/BOOT or BOOT. Indicates a

)))

failed or missing boot ROM. Eight-digit

nnnnnnnn 06

Occurs on execution of a Halt

)))

instruction after typing a console boot

code is PC+-2 and loop count.

command. Indicates a failure of the read
of logical block 0 of the selected boot
device. Eight-digit code is PC+2 and
should equal base address of first good
64 Kb of memory plus FX16 for TU58 or

FX20 for RX06. This failure occurs in
the BOOT ROM routine.

VAX-11/750 SELF MAINTENANCE DIAGNOSTIC

MICROVERIFY CODES

Code
‘@’

‘C

‘B’

PC+2 Test Name/Error Message
000
001
031
033

051

052
054
057
058

05B
05D
OSE

‘'

‘r

J’

‘L

061
062
064
067
068
091
092
094
097
098

0A1l
0A2
0A4
0A7
0A8

0Cl1
0C2
0C4
0C7
0C8

OCE

RBUS, WBUS TEST
BAD BIT IN DREG OR SUPROT
BAD BIT IN RBUS OR WBUS

MBUS TEST

BAD BIT IN QREG
BAD BIT IN MBUS

SCRATCH PAD BIT TEST
ERROR CLEARING RTEMP
ERROR FILLING RTEMP WITH ONES

ERROR CLEARING GPR
ERROR FILLING GPR WITH ONES
ERROR CLEARING IPR

ERROR FILLING IPR WITH ONES
ERROR CLEARING MTEMP
ERROR FILLING MTEMP WITH ONES

MTEMP EXPLICIT ADDRESS TEST
ERROR ADDRESSING MTEMPO
ERROR ADDRESSING MTEMP1
ERROR ADDRESSING MTEMP2
ERROR ADDRESSING MTEMP4
ERROR ADDRESSING MTEMP38

RTEMP EXPLICIT ADDRESS TEST
ERROR ADDRESSING RTEMPO
ERROR ADDRESSING RTEMPI1
ERROR ADDRESSING RTEMP2
ERROR ADDRESSING RTEMP4
ERROR ADDRESSING RTEMPS8

IPR EXPLICIT ADDRESS TEST
ERROR ADDRESSING IPRO
ERROR ADDRESSING IPR1
ERROR ADDRESSING IPR2
ERROR ADDRESSING IPR4
ERROR ADDRESSING IPR8

GPR EXPLICIT ADDRESS TEST
ERROR ADDRESSING RO
ERROR ADDRESSING R1
ERROR ADDRESSING R2
ERROR ADDRESSING R4
ERROR ADDRESSING R8

ERROR ADDRESSING DUAL PORT

VAX-11/750 SELF MAINTENANCE DIAGNOSTIC

MICROVERIFY CODES (Cont)

Code

PC+2

‘O’

Test Name/Error Message

OF7

XB/IR/OSR BIT TEST
ERROR IN XB31:0)
ERROR IN XB63:32)
ERROR IN IR
ERROR IN OSR

111

ERROR SOURCING ONE BYTE

OF1
OF2
OF4

‘Q’

SOURCE XB PC INCREMENT TEST
FROM

112

ERROR SOURCING 2 BYTES

FROM

XB OR INCREMENTING PCBY 1

114
117

‘R’

ERROR SOURCING AN UNALIGNED
LONGWORD OR INC PCBY 2
ERROR INCREMENTING PC BY 4

RNUM/DSIZE TEST
121

ERROR READING DSIZE ROM

OPERAND 1

122
124

ERROR LOADING/READING RNUM
ERROR READING DSIZE ROM

OPERAND 2

127
128

ERROR LOADING/READING RNUM
ERROR READING DSIZE ROM
OPERAND 3
ERROR LOADING/READING RNUM

12B
12D

ERROR READING DSIZE ROM

12E

OPERAND 4
ERROR LOADING/READING RNUM

‘T
141

142
144

RNUM/DSIZE TEST CONTINUED
ERROR READING DSIZE ROM
OPERAND 5
ERROR LOADING/READING RNUM
ERROR READING DSIZE ROM

OPERAND 6
‘X

CACHE PARITY ERROR TEST
181

FAILED TO GET CACHE PARITY

ERROR
182

BAD MACHINE CHECK ERROR

184

BAD CACHE ERROR REGISTER

SUMMARY REGISTER

1B1

TB PARITY ERROR TEST

FAILED TO GET GROUP 0 TB PARITY

ERROR

VAX-11/750 SELF MAINTENANCE DIAGNOSTIC

MICROVERIFY CODES (Cont)

Code

PC+2

Test Name/Error Message

‘T

1B2

BAD TB GROUP PARITY ERROR

1B4

BAD MACHINE CHECK ERROR

1B7

FAILED TO GET GROUP 1 TB PARITY

1B8

BAD TB GROUP PARITY ERROR

(Cont)

1BB

SUMMARY REGISTER
ERROR

BAD MACHINE CHECK ERROR
SUMMARY REGISTER

CONTROL STORE PARITY ERROR

1D1

1D2
‘e’

1E1
1E2

TEST

FAILED TO GET CONTROL STORE
PARITY ERROR

ERROR IN CONTROL STORE PARITY
ERROR

CACHE TEST

ERROR FILLING CACHE WITH ONES.
LOCATION NOT INITIALLY = 0

ERROR FILLING CACHE WITH ONES.

UNABLE TO WRITE ONES

VMB PRIMARY BOOT FAILURE CODES
Code

Description

%BOOT-F-Unknown

Indicates CPU is not a VAX-11/750

Processor

or VAX-11/780. Check SID register
for proper jumpering in CPU-type
field on backplane.

%BOOT-F-Unexpected Indicates that one of the
exception

following exceptions has
occurred:
Access violation

Breakpoint opcode
Reserved operand

Thit trap.

%BOOT-F-Unexpected Indicates some sort of machine
Machine Check

check occurred. Check all
adaptors using console examine
and deposit commands. Probably a
timeout.

VAX-11/750 SELF MAINTENANCE DIAGNOSTIC

VMB PRIMARY BOOT FAILURE CODES (Cont)

Code

Description

%BOOT-F-Nonexistent Self explanatory. Check
Drive

DEFBOO.CMD on 11/750 and make
sure system disk is drive being

booted.

%BOOT-F-Unable to

VMB can’t find

locate BOOT file

[SYSEXE]SYSBOOT.EXE or if bit
4 in RS is set, VMB can’t find
[SYSMAINT]DIAGBOOT.EXE.

%BOOT-F-Bootfile
not contiguous

Indicates that
'

[SYSEXE]SYSBOOT.EXE or
[SYSMAINT]DIAGBOOT.EXE is
not contiguous on system disk.

Recopy or rebuild.

%BOOT-F-1/0 error

Indicates problem reading boot

reading boot file

from disk by $QIO service.

SYSTEM CONTROL BLOCK
Interrupt

Interrupt (I)

Priority

Vector

Description

Level

Exception (E)

SCBB+0

Not used

—

SCBB+4

Machine check

Kernel stack

Power fail

Reserved

SCBB+8

invalid
SCBB+C
SCBB+10

opcode
SCBB+14

Customer
opcode XFC

SCBB+18

Reserved
operand

SCBB+1C

Reserved
address mode

SCBB+20

Access
violation

SCBB+24

Translation

invalid

VAX-11/750 SELF MAINTENANCE DIAGNOSTIC

SYSTEM CONTROL BLOCK (Cont)
Interrupt

Interrupt (I)

Priority

Exception (E)

Vector

Description

Level

SCBB+28

Trace trap

SCBB+2C

Breakpoint

SCBB+30

Compatibility

SCBB+34

Arithmetic

opcode

mode

trap

SCBB+40

CHMK

SCBB+44

CHME

SCBB+48

CHMS

SCBB+4C

CHMU

Corrected

Write bus

SCBB+54
SCBB+60

‘read data

error

SCBB+84

Software

SCBB+88

Software

SCBB+8C

interrupt

Software
interrupt

SCBB+90

Software

SCBB-+94

Software

SCBB+98

SCBB+9C
SCBB+A0

interrupt

Software
interrupt

VAX-11/750 SELF MAINTENANCE DIAGNOSTIC

SYSTEM CONTROL BLOCK (Cont)
Interrupt

Interrupt (I)

Priority

Vector

Description

Level

Exception (E)

SCBB+ A4

Software

interrupt

SCBB+
A8

Software
interrupt

SCBB+AC

Software
interrupt

SCBB+B0

Software

Software
interrupt

Software

14-17

Console
receive

Console

interrupt

SCBB+B4

Software
interrupt

SCBB+B8

SCBB+BC

interrupt

SCBB+CO0

Interval
timer

SCBB+F0

TUS58
receive

SCBB+F4

TUS5S8
transmit

SCBB+F8

SCBB+FC

transmit
SCBB+160

MASSBUS
adapter 0

SCBB+164

MASSBUS
adapter 1

SCBB+168

MASSBUS
adapter 2

SCBB+200

UNIBUS

VAX-11/750 SELF MAINTENANCE DIAGNOSTIC

SPECIAL VECTOR BIT FUNCTIONS
If Vector
Bits (1:0)
Equal to:

Then:

Use kernel stack unless interrupt stack bit in

processor status longword is a 1.

Use interrupt stack

Trap to WCS location 2001, if WCS is not
present or disabled, trap to location 0001 in
CS. Remove backplane jumper from slot 5 B44
to B48 if WCS is installed.

Halt at vector (PC points to interrupted

instruction or faulted instruction)

VECTOR MICROADDRESSES
Initiation

Address

Function

Method

0000

Power up

0011

Arithmetic trap

DO service

0012

FPA integer overflow

DO service

trap

0014

Timer service

DO service

0015

T-Bit trap

DO service

0016

Console CTRL/P trap

DO service

0020

Control store parity

Microtrap

error

0021

Read unaligned data

Microtrap

0022

MSRC XB Miss

Microtrap

0023

MSRC XB ACV"

Microtrap

0024

Write unlock unaligned

Microtrap

data

0025

Write unaligned data

Microtrap

0026

Write unlock crossing

~ Microtrap

page boundary

VAX-11/750 SELF MAINTENANCE DIAGNOSTIC

VECTOR MICROADDRESSES (Cont)
Initiation
Address

Function

Method

0027

Write crossing page
boundary

Microtrap

0028

Machine check

Microtrap

exceptions (See note)
0029

But XB Miss

Microtrap

002A

Read TB Miss

Microtrap

002B

Write TB Miss

Microtrap

002C

FPA reserved operand

Microtrap

002D

But XB ACV

Microtrap

002E

Read ACV

Microtrap

002F

Write ACV

Microtrap

0038

Software interrupt

DO service,
execution
flows

0039

Console interrupt

DO service,
execution

flows

003A

Unibus interrupt

DO service,
execution
flows

003B

003C

Interval timer
interrupt

DO service,
execution
flows

Corrected memory

DO Service,
execution
flows

interrupt

003E

Write bus error
interrupt

DO service,
execution
flows

VAX-11/750 SELF MAINTENANCE DIAGNOSTIC

VECTOR MICROADDRESSES (Cont)
Initiation

Address Function

Method

003F

DO service,

Power fail

execution

flows
NOTE:

MSRC XB TB error

MSRC XB Bus error
Bus error

Unaligned UNIBUS data
TB error
But XB TB error
But XB Bus error

STACK CONTENTS ON SELECTED VAX EXCEPTIONS
Machine Check
Location

Contents

(SP)

Length parameter

(SP)+4

Summary parameter code

(SP)+8

Virtual address

(SP)+C

Program counter

(SP)+10

Memory data register

(SP)+ 14

Saved mode register

(SP)+18

Read lock time out

(SP)+1C

Translation buffer group register

(SP)+20

Cache error register

(SP)+24

Bus error register

(SP)+28

Memory control error register
Program counter
Processor status longword

(SP)+2C
(SP)+30

Machine Check

Code

Description

~Nn
B W~

Summary Parameter Codes

CS parity error
Memory error

Cache parity error
Write bus error
Corrected data
Bad IRD

VAX-11/750 SELF MAINTENANCE DIAGNOSTIC

Arithmetic Trap

Location

Contents

(SP)

Error code

(SP)+4

Program counter

(SP)+8

Program status longword

Arithmetic Trap

Error Codes
Code

Description

0
1
2
3
4
5
6
7

Undefined
Integer overflow
Integer divide by zero
Floating overflow
Floating/decimal divide by zero
Floating overflow
Decimal overflow
Subscript out of range

Compatibility Mode
Location

Contents

(SP)

Error code

(SP)+4
(SP)+8

Program counter
Program status longword

Compatibility Mode
Error Codes

Code

Description

0
1
2
3

PDP-11 reserved operand
Breakpoint opcode executed
I/0O trap
Emulator trap

Trap

5
6

Reserved instruction (HALT)
Odd address referenced

Translation Not Valid or Access Violation
Location

Contents

(SP)

Error code

(SP)+4

Virtual address referenced

(SP)+38

Program counter

(SP)+12

Program status longword

VAX-11/750 SELF MAINTENANCE DIAGNOSTIC

Translation Not Valid or Access Violation
Error Codes

Description

Code

Read access violation or XB access violation or

PTE fetched not valid for read

Accessing system 1 space (S1) or length violation
No access to process page table (from SPTE)
Process PTE VA not in system virtual space

Same as 0—3 but for write access rather than read
access

VAX-11/750 INTERNAL PROCESSOR REGISTERS (IPRS)
Read Only
or Write

Address

Mnemonic

KSP

ESP

Only

Name

Kernel stack pointer

Executive stack
pointer

SSP

Supervisor stack
pointer

USP

ISP

User stack pointer

Interrupt stack
pointer

Reserved

POBR

PO base register

POLR

PO length register

P1BR

P1 base register

PILR

P1 length register

SBR

System base register

SLR

System length
register

VAX-11/750 SELF MAINTENANCE DIAGNOSTIC

CMIERR

CMI ERROR REGISTER

IPR #17

THIS IPR IS READ ONLY WITH THE EXCEPTION OF BIT 20,
WHICH IF WRITTEN WILL DISABLE THE CMI. IT CONTAINS
PACKED COPIES OF THE FOLLOWING REGISTERS. THE CMI
DISABLE REGISTER, SAVED MODE REGISTER, RLTO, TBGPR,
TB HIT REGISTER; AND THE BUS ERROR REGISTER

f’nll’fi M

DISABLE CMI =1
READ =1, MODIFY =0
VIRT =0, PHYS =1

SAVED CPU MODE{

READ LOCK TIMEOUT
=1
TB G1 TAG PARITY ERROR
TB GO TAG PARITY ERROR
TB G1 DATA PARITY ERROR
TB GO DATA PARITY ERROR
TB HIT LAST REFERENCE
MEMORY ERROR
READ DATA SUBSTITUTELOST ERROR
CORRECTED READ DATA
TBGDR

TRANSLATION BUFFER
GROUP DISABLE REGISTER

IPR #24

THIS IPR IS READ/WRITE TO ALL BITS

0= RANDOM REPLACEMENT|

3210

1]
]

1= FORCE REPLACEMENT

0= REPLACE GROUP 0

1= REPLACE GROUP 1

FORCE MISS GROUP 1 -

FORCE MISS GROUP
0

CADR

‘

CACHE DISABLE REGISTER

IPR #25

THIS IPR IS READ/WRITE
31

]
DISABLE CACHE———-—]
IPR #27

CACHE ERROR REGISTER

CAER

THIS IPR IS READ/WRITE
3210

CACHE TAG PARITY ERROR
CACHE DATA PARITY ERROR
LOST ERROR
CACHE HIT

MCESR

MACHINE CHECK ERROR SUMMARY REGISTER

IPR #26

THIS IPR IS READ/WRITE TO ALL BITS. WRITING, A1 TO BIT 3
CLEARS THE BUS ERROR REGISTER. WRITING A1 TOBIT 2
CLEARS THE TB GROUP PARITY REGISTER.

BUS ERROR, REFER TO BUS ERROR REG.

TB PARITY ERROR:
UNALIGNED UNIBUS REFERENCE
XB FETCH =1, OPERAND FETCH=0

3210

=
'

| |

MA-65683

Figure 3

Memory Status and Control Maps

VAX-11/750 SELF MAINTENANCE DIAGNOSTIC

VAX-11/750 INTERNAL PROCESSOR REGISTERS
(IPRS) (Cont)

Address

Mnemonic

Reserved

PCBB

SCBB

Read Only
or Write
Only

Name

Process control block
base

System control block
base

Interrupt priority

IPL

level

ASTR

SIRR

AST level register
wO

Software interrupt
request register

SISR

Reserved

CMIERR

ICCS

NICR

Software interrupt
summary register

CMI error register
Interval clock

control /status

Next interval count
register

ICR

Interval count
register

TODR

CSRS

Time of day register
Console storage
receiver status

CSRD

CSTS

Console storage
receiver data

Console storage
transmit status

CSTD

Console storage
transmit data

VAX-11/750 SELF MAINTENANCE DIAGNOSTIC

VAX-11/750 INTERNAL PROCESSOR REGISTERS
(IPRS) (Cont)

Read Only
or Write

Address

Mnemonic

RXCS

RXDB

Only

Name
Console receive
control /status

Console receive data
buffer

TXCS

Console transmit
control /status

TXDB

Console transmit data
buffer

TBDR

Translation buffer
disable register

CADR

Cache disable
register

MCESR

Machine check error
summary register

CAER

ACCS

Cache error register

Accelerator control/
status register

Reserved

VAX-11/750 SELF MAINTENANCE DIAGNOSTIC

VAX-11/750 INTERNAL PROCESSOR REGISTERS
(IPRS) (Cont)

Read Only
or Write
Address

Mmnemonic

Only

Name

Reserved

IO RESET

Initialize UNIBUS

MME

TBIA

Translation buffer
invalidate all

TBIS

Translation buffer
invalidate single

TB DATA

Memory management
'
enable

Translation buffer
data

Reserved

PMR

Performance monitor
register

SID

Reserved

System identification

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