Campbell 21X Manual do Operador descarregar pdf (Página 30)

SECTION 1.

FUNCTIONAL

MODES

compilation.

The

display is not

updated after

entering

*0.

When

the

*0, *B,

or

*D

Mode is

used to compile,

all

output

ports

and flags are

set low, the timer

(lnstruction

26)

is reset, and

data values

contained in Input

and

Intermediate

Storage

are

RESET TO

ZERO.

The

21X should

normally

be left in the.0

Mode

when logging

data.

This

Mode

requires

slightly

less

power

than Modes which

frequently

update

the

display.

1.5

MEMORY

ALLOCATION

.

-A

1.5.1

INTERNAL

MEMORY

There

are 8 sockets

on

the 21X

CPU board

which

are used for

Read

Only

Memory

(ROM)

or

Random

Access

Memory

(RAM).

The basic

2'lX is

provided

with 64K

of memory:

three 8K

Programmable

Read Only Memory

(PROM)

chips for a

total of 24K ROM

and five 8K RAM

chips. Appendix

E describes how

to

change

RAM

and

ROM

chips.

When

powered-up,

the

21X

displays HELLO

while

performing

a

self

check;

the result of the

check is then displayed. The

8 characters in the

display represent

the

8 memory

sockets

numbered

from left

to

right: 1 means a

good

chip is

in

the

corresponding socket; O means

the

socket is empty or

an

error was

detected in the

chip.

For example,

when equipped

with

standard memory,

the

display will

read

"1

1:1 1 1 1 1 1";

the five

1s

on the left

represent the

8K RAM chips;the

three

1s

on the right, the

three

8K

PROMS.

PROM

Avail.

bytes

24K

Avail.

Loc.

"Default

allocation on

Program

Memory

978

There

are 978

bytes

allotted

to

program

memory. This

memory may

be used

for

1

program

table

or shared among

all

program

tables. Tables

3.9-1 to 3.9-4 list

the

amount

of

memory used

by each

program

instruction.

Input

Storage

is

used to store the results

of

'

lnpuUOutput

and Processing Instructions.

The

values stored in input locations

may be

displayed using

the

*6

Mode

(Section

1.3).

Intermediate Storage is used

by Output

Processing Instructions

to store

the

results

of

intermediate calculations necessary for

averages, standard

deviations, histograms,

etc.

Final

Storage holds output data, the

results

of

Output

Processing

Instructions

which

are

when

the Output Flag

is

set high

(Section

3.7).

The

data

in Final

Storage can be displayed

using

the

*7

Mode

(Section

2.3).

Figure OV2-1 illustrates the use

of

Input,

Intermediate,

and Final Storage.

Each Input or Intermediate Storage

location

requires 4 bytes

of memory.

Each Final

location

requires

2 bytes of memory.

Low

resolution data

points

require

1 Final Storage

location and high resolution data

points

require

2.

Section

2 describes Final Storage and data

retrieval

in

detail.

Table

1.5-1

lists

the basic memory

areas

and

the amount of memory allotted to

them

in

the

standard 21X.

Input

Intermediate Final

Storage*

Storage*

Storage

112 256 38.592

64 19.296

TABLE

1.5-1. Memory Allocation

in Standard 21X

(24K

ROM,40K RAM)

System

Memory

1022

1-4

1 2 ... 25 26 27 28 29 30 31 32 33 34 35 ... 190 191

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