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MAINDEC-08-D6GB-D

December 1967

12 pages

Original

0.2MB

Document:	maindec-08-d6gb-d
Order Number:	MAINDEC-08-D6GB-D
Revision:
Pages:	12
Original Filename:	https://svn.so-much-stuff.com/svn/trunk/pdp8/src/dec/maindec-08-d6g/maindec-08-d6gb-d.pdf

OCR Text

(7u\

IDENT IFICATION

Product Code:

MAINDEC-08-D6GB-D-(a)
Product Name:
A/D CALIBRATION CHECK

Date Created:
Maintainer:

AIov ir ee7
Diagnos+ic Group

Author:

Hittell

ADVANCE COPY
"ls

DESCRIPTION IS PREUMINARY AND

suBj[er TO CHANGE mTh'OuT NOTicE.

.PDP.a
LIBPAIJY

-J

(

'
..

(
(

.;`

-u*l
'

I-,--

ABSTRACT

The A/D Calibration check for the converters is +o be used to a§cert.Gin the accuracy
of convert.er adiu§tmenls. This tape is to be used with an adjustable voltage source/
The converted value will be displayed in the AC, and the switch regisler will be used
to select multiplexer channels. (Passing of these checks do 'not guarantee 100°/a
monotoncity, steady slate accuracy, since all of the 4096 possible conditions are not
checked).
2-

REQUIREMENTS

2.I

Equipment

PDP-8 or 8/S Standard Compu,ter

A/D Converter
Adiustable Voltage Source (0.01°/o or better, I out < I.0 ohm)

2.2

Storage

2.2.I

Progrcm storage -the routine users memory from address 1¢? to 65¢ and location 0 and I.

LOADING PROCEDURE

3.I

Methods

Procedure for nomal binary tape should be followed.
i_"

STARTING PROCEDURE

4.I

For normal opera+ion all switches should'be down.

4.2

Starfingaddressis:

(A)100forAFOIA

(8) ]01 for ADO8A
(C) 102 for ADC]

4.3

Program and/or operatorAction
Connect voltage source lo input connector.
Load the program into memory.
Set switch register to Starting Address
Load Address.
Select multiplexer channel using switch register 6 to 1 I -1 (AFol only)
Press Start

'L*i.

Page 2

OPERATING PROCEDURE

Set the voltage source to the voltclge desired, inspect the AC for +he correct
converted value.
For starting Address ]Ol,102
SR =Conversion Display Time
SA 103 Routine for set+ing Muxtiplexer
SR =Channel
SA T04 Routine for lncremenfing Muxtiplexer
SR = Channel except foroverflow
which should = zero

lf alignment errors are severe the converter should be recalibra+ed.
section in A-D Converter manual .

6.I

ErrorHalts

6.I.I

See maintenance

Hc'lt (pc)
Func+ion Being Checked

AFol

ADO8.A
Flag cleared by start Key
.
Buffer initialized by Sfarf Key
Convert lnstruclion sets the flag
Read Buffer Instruction cleats the flag
C'ear Muxfiplexer, sets the flcig
Set Muxtiplexer, sets the flcig
Index MuxtipJexer, sets the f'cig
lnterrupf Up
Interrupt Down

For more informcllion see listjng.
7.

RESTR

'CT'ONS

DESCR lpTION

Thisroufinechecksboth]heinterruptandconversiondoneflogs.Usestheswitch
register,Bits6toT]asthedesiredmultiplexerchcinnel,convertsthevollageon

tmh:I;:p'ieecxt::cchhaannnneei':.ssDej,Sepc`taeyds,j`c::vt:rets%;sptaf;:rj:tdhee'axcc.heckst°Seejfanew

Pc'ge 3

Word Length
(No. of Bits)

Max. Switching
Point Error *
Of

INPUT Voltage Range

± 7 . . 6 O/o

± 0 . 8 O/c}

± 0 . 4 O/o
± 0 . 2 O/o
± 0 . I O/o

±0'50/a
± 0.025%
* ± 1/2 LSB forquantizing error.

/+lJP-.i

A/0

CAL|BBAT]ON

/
/A/u

Crli`IVE:RTER

HAL

T=74'A2

ENTRANCE

^DDRFSS

ilt i (,. `?

•'J|V'O

L777

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ADn8

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S' M I ' X

/AF'JIA

i-N"ANCE

/A[)08-A

ENTRANCE

/ADrl

ENTRANCE

/SL.T

TEST

/INC.

TEST

/SLi

EoUAL

/GEr`.EHArE

I_i- ---

FOR

F.of?

MUX.

MUX=SR

riux,

MuX=SR

CONVERSION

TIME

I0T

xx=SR

565xx,

it 2 , /'
zci

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/Tt-ST

::;:

;:-,;;

Fun

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TEST

FOR

AF.UIAI

A°SF

/SKIP ONFLAG
/FLAG

42i43
•42'14

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./¢4,4

rd2W5

744to

42W6

74¢2

/W£,:`Rg"FFER

/READ

HALT

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LENGTH=|2

BITS?

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7777

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6532

•4214

74@2

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74%2

;'!3..:i

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ST.ALL

Isi3

STALL

JMP

,.-1

HALT
/WILL READ

`1273

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52?4
6531
7402

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fi534

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NOT

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BUF'F[R

START

BUFF.ER

FLAG

ADPB

/ADCV

DID

ADSF

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FLAG

SKP

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NOT

SET

FLAG

HALT

/WILL

¢224
f']225
4226
4227

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CLEARED

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7410

INJTIAL12E0

NOT

r ^1 ,\

¢218
d211
d212
`4213

4215
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4217

BITS

FLAG

CLEAR

MULTTPLEXER

SET

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CLA

FLAG?

/ADF?a

DID

ADCC

NOT

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FLAG

DCA

STALL

ISZ

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.-1

/START

roNVERT

A I) S F

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ADRB

/WILL-SET

MULTIPLEXER,

SET

FLAG

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FLAG

SET

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FLAG
DONE

(: L A '.

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.-1

A D .S F
HALT

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r;I. t,,

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-i

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.-1.

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010

NOT

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CL^

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FLAG

I.+11

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A IJ C V

IJP

FOP

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/ (; u r. V F rt T

/SHOULD

H A. L T

DONE

CHECK

TAD

1 N T i- i,`, T ,

SET

FLA.G

'rAn

(JMP

:.','CA

/NO

I.+5

AmlB

INTEPBUPT

HE:f<E

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i-)ONE

FLAG

ION

\KP
Li A L T

/I`VTERRuPT

ALWAYS

I''r
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Ir\'

A.C.

/LOAD

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/SET

MUX

/h.AIT

FOR

BEGISTEB
CHANNEL

CLA

A I-J a F'

JMP
A I.) I; V

/ C: 0 N V E H T

A i) S F

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FOB

FLAGS

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BUFF.E:B

.-I

A r) k a

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FLAG

.-I.

t`TALL

•J'.tip

.-1

JS7
Jrl.L)

STALL
.-1

Jrlp

,-15

/WAIT
/DISPLAY

/LOOP,

SET

MILL

SIC

MUX

AND

CONVERT

L..

--*`

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EE5EE±E5=

4376

[5t'.7

vie/7

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vl4ta2
'J J ^ _

¢493

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F'OR

AosF

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CONVER

72q@

426
427
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1376
3@01
f`534

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STALL

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.-1

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SET

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7777

INITIAL13ED

/START

BUF.F.ER

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CLEAR

/(ADCV)
F'LAC

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NOT

SET

F.LAG

/CLEAP
FLAG
/SKIP 0N FLAG
/SHOULD SKIP

HALT

CHECK

/(ADRB)

DID

NOT

/CLEAR

FLAG.

CLEAR

FLAG

CLA

TAr)

(JMP

[.+5

DCAI
A D fi B
TON

/INTEfiRUPT

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rJCA

(JMP

INTERRUPT

ALWAYS

[.+10

AOCV

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STALL

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top

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r777

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/FLAG

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A D F? R

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READ

72¢li'
1375

t..552

AOSF

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INSTRUCTION

HALT

434
'4435
d456

FLAG

/SKIPONF.LAG

INITIAL13Eo

DCAsTALL
IS2

/INTERRUPT

425

ADc;1

ADSF

/WAS`
ADRB

/::#So,Y°foc58SBE:Dg: ;{3RlD8EZ

'p;':E.§Tc#aBE3TE:%GFOR

ADO8-A

FLAG

INTERRUPT

HERE

CONVERT

/U]SPLI\Y

/F.i)t<
/S+

C;ONVERTE:I)

Arc-1

AND

.Ctt:I,[STER

VALUE

H`l

ADo8

E:OUAL

C;ONVERS]Ohl

TIME

JJ446

..532

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I,4447

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+.9`~14

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[255

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'-1

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TIME

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FOR

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MULTIPLE:XEfi

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'544

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TEST

FOR
MULTlpLEXER
LAS

ADSC

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STALL

JMP

.-1

JMP

SMUX

/SCOPE
SET
r.oi-VVER

k46i4

4532

d615

76¢4

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y)625
4626
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roNVER

4 3 .-j

TJ .iJ

`2 i' 3

6,3
614

6~,I
6,`7
4 i,. 4

4 \' :'

?",1

FOR

SHouLri
SHouLri

LOOP

LAS
(8M77

(65®@

ncA

.+1

MULTIPLEXER
MULTIPLE
`'^`n
~'''L,.I_.
/LOAD
CHANNEL
MULTIPLEXER

LiLT

iNST+1

LIGHTS

TIME

/ L I) 0 P

CONVERSION

ST=TIME

/START CONVERSION
BECISTER

/I:OM.PLEMENT

NljMBEB

;cONVERsroN

TIME=

/ I- 0 0 P
F.OR

INSTRUCTIONS

65XX,

XX=SR

BITS

/READ

AND

TAn

EOUAL
EOUAL

ADCV

|r`.STRUCTI0N
NOP

i.Op

777
445

/PEA0

jMP

JIW

CHANNEL

TIME

/DISPLAY

JMP
/SCOPE

/LOOP

/SET

LAS

/|oT
INST,

ONE/LOAD

.-1

IMUX

211
i,2G\7

..11

/SE:T
MULTIPLEXER
/INCBEMENT
MULTIPLEXEB

STALL

JMP

_I.

(-1

/MINUS

.2q'il

LIGHTs

,1^.^

T011

SWITCH

/CREATE

INSTRUCTION

/LiJrATI0N

INSTRUCTION

/IN

SKIP

CASE

/ L. 0 0 P

E=-

.i--=_