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XX-E02FB-92

June 2002

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Document:	pdp9mainthw
Order Number:	XX-E02FB-92
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Pages:	15
Original Filename:	http://bitsavers.org/pdf/dec/pdp9/pdp9mainthw.pdf

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POWDER
MILL

RT. 27 to 62

RUSSO'S

PIZZA
HOUSE

MARION'S

MUNICIPAL
PARKING

,...

DEC
PARKING
FOR TRAINING
WALNUT
ITRAININGI

N
~

a::

ST.

t-:

t/)

MISTER
TAKEOUT

,..:

a::

Z
0

t/)

tl.

:x:

PIZZA
PLACE

PLACES TO EAT IN MAYNARD

HOMEWORK SHEET 111

PDP-9 MAINTENANCE
1. Code the following instructions:

DZM
LAC

TA~
LAW
CLA*

1723
50

/E/17:23
'-0 0 os-o

3~o 0/2-

301
17

?, 0 3 oj
C4A./ ~T do

Otp£/eAh ~sl<oG/;(J-.u

20 Decode the following instructions:

:J/Yl S -:4f. / 0 ~b b

130266 ~.s =/0 + :U.Jd/fl;J/
521234 AA} d ;:..f?'J -I- ~cli;'" ~f
760132 i-Aw /S'L

IJAJd"* /;L "3 c;/

750044
30 list the Memory Reference instructions that can alter normal program sequencingo

-TMP) SAP) /S2- .;[7J1 ~ CAL
j

40 What will be in the following registers after doing an Examine Next operation?

UlJu},l/,JjU J
PC
MB wop..J G~
MA A lJrt./I~C" rfJ
AC
U/Ucl,JlN74 J

L;;/Zi' )J/U)UolZ/ .
/-tJ <:"./l t'N LfrJ4 _J~" J
/>b>CI'IUSJ

0"";

C7ll'A'~"~//I/'9

5. Auto-Indexing can only be used with Memory Reference instructionso
True·.

False

PDP.;.9 MAINTENANCE

HOMEWORK SHEET #2

--.,.

1. When all inputs to an RIll a.-e negative I i~'s oufpui' will be

volts •

. ¢'I/-3v
2. Whoi' is the minimum delay through a B310 tapped delay?

p) 7. ,s-N,>
3. What controll ing flip flopswoold hove to be sei' .to transfer the conteni'S of the
AC to the AR?

AGo j Ad\I ~ h 13"/~1 Otf'lAJ

40 Print K~91117

0
Address Mixer 2 (8169 modul.eat B-6). Input pinH is Hed to
gnd •. What effeci' will inputs eitherposit~e or negative on pin F have on "he
output?
.

~~~ -...3

C~91119-30 The SAO F/F is.a COi11'rol Memory F/f.

True

---"=----

6 .. Print KC,09#14o Function called CI 170 Write a logitalexpression for C! 17 to
be l'rue.
~

+/(1) V f:.O(I)/I SkiP"'1 V [!ORUIY-. J;jx:s({j{~:,<rr(i)A B2J V
[iAO(I) A O~H V 11. ur

IN)CO}]

7. The following program has been runo What Clre the contents of ~he AC, 700, Clnd ISO?

600

LAC

601

AND

702

602

DAC

700

603
604
150
151
152
700

JMS
HLT

150

-S24
\C2J? ". (8)
C(700) =

"fAD *
XCT
HlT

601

C(lSO) == ~:E

702

700

C(AC) =

6°i~, .

'i., . ..(8)

602
."

124056
016000

80 Print KC,09'1. The MB contains 357162; the following conditions exis'-: SUB is 50i',
CMPl and CI 17 are present, MOl is set .. What wm be the octo! result.in ,,·hs !:lG?

PDP-9 HOMEvvORK SHEET ti'J

20 The tokll time required tc) c.omplete three sequellkiol main memory cycles is:

3~ Me '3. The CP has access to memory, MS17 is (fJ), and AM 17 is (1)0 The voltage OA
the output of the ~fxer produdng MBS 17 is positive (gnd)G

True

*' .

-==

Fa&se

------

40 If the SMflip flop is reset, ~nd a Ct..K'is genera.ted (igput t~ Me'2) I wiH the memory
'ogic produce· ct SYNC Cl~ (Me tl2) and do an tv'I/Jam?

50 The SM Flip flop is set, and a elK s(gna' ;s applied to MC#'}.o The Digit Write Sink
flip flop can not be raseto How wilt this effect the memory cycle?

60 The determiniOQ facto, for Digit Cum.mt durillg the write pcrdion'of a memorY cycle is:
A. The word read fro.n memory
-80 The contents of .foe MAo
C. The Ward cutrei1to
Do The contents oft he MB
0

PDP-9 HOMEWORK SHEET 1J4

The CMA contains 24(8)! the IR contains 10010. If the ~09i(.. producing REP failed .
and generated REP at this time, what would be the next Control MemoifY location to
be cycled?

2. An'"i'Contro! Memory location thatsats the Conto F/F when cycled, will be followed in lS8ns
by a CLR pseudo-cycle
Q

True

False

... 3. KC09 '170 (3210 at 0-40 GIven the following inputs e what will be the se3ec:ted output?
HV (-)q JV(-)u HU(-)~ HS(+), HT(-), HD (-), HE (+), JU (+}o JS .(+), JT (+)" JD C+)'. JE (+)

Ao CMP-7
B. CMG-7

Co CMP-6
Do CMG-6

40 The Register Display can not display the contents of theieftected regi£ter when the computsl"
is running due to the speed at which the registers contents is chaRging e
False

True

5. How would an I)perator normally keep tfack of the Bocotions in memcwy that all'e being
deposited into, when manually loading data via the console switches?

__ 6. How many times will the computer perform the instruction in location 201?

200
201
202

LAC

203
204
205

206
16

205

DAC~

ISZ

206

JMP

201

HLT
632000

m717

401 606

PDP.. 9 HOMEWORK SHEET II 6

2-'1r

10 When doiQ9 a TAD *12 instruction, when wiU the AUT INX flip flop be res\i!t?

r:r/V~~ ~.

.l.J~ .-.:. fIC

-C)If

20 If the ADR =~ SAVE flip fiop con not be :iet, would this effect the pooper operation of
the SAD instruction?
'

1,/0
30 )!flite a'ogical... expreSSl)ontha~scribes ADD overfjow (ADOF)~

('~o//. copt -I-l COd/, • CcJcfL)

4. CoaIrol Memory locatl n 3whan cycled~i1J ~t the MSI flip flop.
effect normal operot· of the instrucHol'lo

True

False'

Thi~ wiUnot

,
,=--u

~ What (£M location Nust be cycled to get address 20, when pe.forrning a CAL instruction?

60 The computer e>Utcutes tbeinstructloD 300 100, The AC c:onlaiAS 400 146 and location 100
contains 643 217.,
'
.
.
What will be the re5Ult in the Acl
will there be end around catTy?
Will ADD overflow exist?
What win be the sign of the result?
What will 'fi~ L!N~ contain?

70 When performing the instructfon JMP 500, IRt is set when CML 12 is cycled. When will IRI

/yr

,~t?

So Wrfte a logicnt ,expression to describe when the iR will mfOd:e up the last 4 bits of the eM address o

9. What imnvctions would fall to'fvnttion correctly if CMl<~~ failed'to sat the CJiT Hlp flop?

PDP-9 HOMEWORK SHEET 117
1.. Whatlnstructiorv's could fail to operate properly if the AC SIG N flip flop could not be set?

20 Could a negative 12436(8) be loaded into the AC in two's complement form using a LAW
InstNction? If yes, what would be the octal code?

3. The Repeat Switch on the console, when used in coniunctlon with the Single Instruction
Switch and Cont key, allows the computer to continuously perform the same instruction.
0

True

"""""'---

False

=---

40 The following program is in memoryo Slng'e Step Switch is up, Key 10 Reset is activoted,
addl'8$S 177 is set on the Address Sw;tches and Start Key is activated" What will be in
t1e PC, MB, MA, and AC when the computer halts?

177
200
201

DZM

elC
HLT

1..,

PC
MS=

AC--=·

9 .. What will be in the AC after the following progrom has been run?

1010

1011
1012
1013
16
263

LAC
AND

1010
263
16

xog9
HLT
000262
741 041

~o 0;//
/

PDP-9!9L Homework
~"'~'-··'·-...Jlle following pi'ogrom is !\\'ored in the computer" The ()penl~()f does Oft 10 Rer.et" pots addrrefic'i
- -- 500 on fhe Address SIt':itches, Gnd activates the Start Key.j Who~ VI iH be the content!. ofi'M

link and AccumuIClto~' when the computer. Holts?

aJ
b)
e~

t(1~~ AC 740674

Lnpt: AC 701356

t~}J AC ·441373
tf~}, AC 740673

500
501
502

503
504

lAC

601

200601

XOR

602

240602

OZM

510

DAC
JMS

21
530

1405W
-~21
100530

505

440010

506

XCT

532

507

TAD
5tH
777771'00" 0 0-0
740040

400532
340501

·510
511

'J',

oooooo@

~~~J..-,

ADD
-10 07" 00 G/
SAD
501
JMP
53)
JMP '":t- 530

AND

601 Q 0 Do ~o

000502' -\$-

20
21

1)00000
146040 7'7"0 0)/0

601

000041

602

740fj() 1

500601
320010
540501
600531
620530

cJo~a9'/

7 L7d o~O
.:s~Oo7!

7;/0 b 73

PDP- 9 HomcTTorlc ~h00t /'~l - ANSHER.S

Iln 723
200 050
:;60 012

760 301

Illegal lnstruct10n

2 <>

JMS * 10266

AND * 123}~
Uti
132
CLA.
OAS

liLT

or Ll\'S HLT

3. CAL, J!t1S, JMP

ISZ and SAD 1f conditions n..remet.
XOT can if it executes one of the instructions that a1~e listed

~..

AR - The address of the locat1on that 'Uas examined
PC - Unchanged
.
. MB - The 'Hor'd fraan momory
MA. - Th.G address of' the loca.tion that llas examined

AC - Unchanged

Tl'ue

PDP...,.91k:mevTO:rk Sheet #2

ACO~

None

ANSWERS

ARI

50 False
60

+1(1)
v

~o (1) "SKIP (lU v [AT:RL: AXS
{SAO (1)0
~H nne + AUT IW"{ (1)]
v

7,.

C (AO) :: 004 000
C (700) = 004 000
C (150) = 000 604

'57 162

(lJ v ~Jrr(l)" IS?]

PDP-9 Homework Sheet #3 - ANSWERS

17m (8)

True

Yes

Memory cycle 'tdoll not take place (No read or write)

False

FaJJ3e - RUN must be restr1to use the REP!' CU{o

Monitor the AR on the REgister Display

..-

60 49 tinles

PDP... 9 Hane'Work Sheet #6 - ANSWERS

When cyoling aMI. 24

(CO ~ ;. tft)jOI) + (C~ tJ C~)

False

50 24
60

AC .. 24:; 446

There will be end SZ'Otm.d ca.:t'I'Y

!'bare "1111 be ADD ove:rflOt{
Positive result
LINK 'tI11ll be set

VJhen cyoling OM[, 74

@MAP1 (1) + REP]

90 CAL, JMS

OMAJ.(l)

PDP-9 HOm6irTOrk Sheet #7 ... ANS:lJlERS

SMA, SPA

20 Yes· 165 34~

3. False

MA
AO

00200
l40010
00177
000 000