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MAINDEC-15-DAKAA-A-D

November 1972

10 pages

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Document:	JMS Y Interrupt Test
Order Number:	MAINDEC-15-DAKAA-A-D
Revision:
Pages:	10
Original Filename:	http://bitsavers.org/pdf/dec/pdp15/diag/MAINDEC-15-DAKAA-A-D_JMS_Y_Interrupt_Test_Nov72.pdf

OCR Text

IDENTIFICATION

PRODUCT CODE:

MAINDEC-15-DAKAA-A-D
REPLACES: MAINDEC-15-DOFB-D

PRODUCT NAME:

JMS Y - INTERRUPT TEST

DATE CREATED:

NOVEMBER 7, 1972

MAINTAINER:

DIAGNOSTIC GROUP

AUTHOR:

ED STEINBERGE~/EARL L. BOUSE

ABSTRACT
The JMS Y - Interrupt Test determine if the PDP-IS will complete
a JMS Y (where Y is some random value) instruction before it goes
into program interrupt.

This is done by setting an I/O flag and

then transferring control to an ION/JMS Y instruction group (which
is located at some random place in memory).

The computer should

complete the JMS Y plus the next instruction before the computer
goes into program interrupt.

If no error occurs, the ION/JMS Y

instruction group is moved to other random memory locations and
the test is repeated.

Errors are indicated to the operator via

the Teletype or error halts.

REQUIREMENTS

2.1

Equipment
Standard PDP-IS Computer.

2.2

Storage
The program uses all of 4K memory for the program or as a test
area.

The program occupies memory from location

wld tests all locations below 07277.

2.3

Preliminary Programs
Basic Instruction Tests

07300 to 07711

LOADING PROCEDURE

3.1

Method
a.

Put HRI tape of program in reader (high speed if available)

b.Set ADDRESS SWITCHES to 07300; the BANK MODE switch on a 1.
c.

Depress and release READ IN key

STARTING PROCEDURE

4.1

Control Switch Settings
The following is a table of ACCUMULATOR SWITCH settings and their
action in the program.
AC Switch

o
I

2
3

Set As
I

o
I

o
1

o
I
o

Action
Halt on error.
Don't halt on error.
Don't print error.
Print errors.
Ring bell on error
Ring bell after N passes.
Loop on current Y.
Don't loop on current Y.
Loop on current location.
Don't loop on current location.

N is an arbitrary number (initially 100 a) which is controlled by
the LAW-N instruction in location 07300 and may be changed at the
operator's discretion.
4.2

Starting Address
The starting address of the program is 07300.

4.3

Program and/or Operator Action
a.

Set

ADDRESS SWITCHES to 07300.

Set ACCUMULATOR SWITCHES to desired positions (see section ,4.1)
Normal setting is 500000.

Depress I/O RESET.

Depress START.

OPERATING PROCEDURE
See Section 4.1.

5.1

Subroutine Abstracts
None.

5.2

Program and/or Operator Action
To put the program in the scope mode, the ACCUMULATOR SWITCH REGISTER should be set to 260000 (don't halt, don't print, bell after
N passes, loop on current Y, loop on current location).

ERRORS
Unless AC switch 1 is a 1, errors will be printed on Teletype.

6.1

Error Halts and Description
There is one error halt inside the program at location 07507.

Any

program diagnosed errors will cause a halt at this location if AC
switch 0 is a 1.

The program stores HALT in all locations of the

test area of memory.

If the computer does not go into program

interrupt immediately after executing the next instruction (a NOP)
after the JMS Y, the computer will halt at location Y + 2.
6.2

Error Recovery

6.2.1 Program Diagnosed Error
If AC switch 0 is a 1, the computer will halt on a diagnosed error.
To recover from this type of error, reset AC switches 0 to 4 as
necessary,

(see section 4.1) and then depress CONTINUE.

6.2.2 Interrupt Failures
Interrupt failures will cause a halt at location Y + 1.

To recover,

reset AC switches 0 to 4 as necessary (see section 4.1) and then
start the computer at location 07300

(BEGIN) after depressing I/O

~~T.

6.2.3 Test for ION, JMS Y, and Y
To test particular memory locations for the ION, JMS Y, and/or Y,
store the address of the ION in location
address +1 in locatiori
g7674 (POINT3).
~SET,

~7673(POINT2),

~7672

(POINTl), that

the address Y in location

Then set AC switches 3 and 4 to 1, depress I/O

and start the computer at location 07300 (BEGIN).

Y and

location of ION must be less than 07277 and not 00000 or 00001.

6.3

Error SWitch Hierarchy

6.4

Error Typeout EXample
ION-JMS Y
JMS AT

My"

C CO)

C(Y)

001234

007654

001235

740040

The above example shows that a JMS 7654 instruction was
in location 1234 (it is implied that the

Ia~:

s~~r~~

is in 1233).

";':.1'.:

l:t;S

stored in location 00000 as well as the 740040 (HLT) in Y indicates
the JMS was not completed before the computer went into program
interrupt.

MISCELLANEOUS

7.1

Execution Time
Approximately 96 ms per ION/JMS Y instruction group.

PROGRAM DESCRIPTION
a.

The first function that is performed is that of initialization.
A register to count loops and a location to assure typeout of
the error message header are initialized, and the bell on the
Teletype is rung to raise the teleprinter flag to assure a
flag for program interrupt.

Then a check i"s made to see if the locations of the ION and JMS Y
instructions should be changed (switch 4).
changed, the program proceeds to c.

If they are not

If they are, a number is

obtained from a random number generator, made into an address
and checked that it is below the program, not equal to Y or Y + 1,
not equal to 00000 or 00001, and stored in Point 1 and incremented and stored in POINT2.
c.

Then a check is made to see if the number Y should be changed
(switch 3).

If it is not, the program proceeds to d.

If it

is, a number is obtained from a different random number generator than was used in b, made into an address, checked to see
that it was at least 2 below the program, not equal to the
location of ION or JMSY instructions, not equal to 00000 or
000001, and stored in POINT3.

Then HALT is stored in all memory locations in the test area
of memory.

The ION instruction is stored, as well as the JMS Y

instruction after it has been formed from Y and JMS.

The AC

and Link are then cleared and control is transferred to the
ION/JMS Y instruction group.

Upon return from the program interrupt, the contents of location
Yare checked as well as the contents of location 00000 to make
sure the proper numbers were stored in these locations.

If not,

the error subroutine is called.
f.

A check is then made to see if the SCOPE mode CAC switches 3
and 4 a 1) has been requested and if so, control is immediately
transferred back to the instruction group.

If the instruction group is not being SCOPED, a check is made
on ringing the bell (switch 2) after which control goes back
to b.

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