Owner`s manual

ManualsBrandsEverex ManualsComputer equipmentEV-159

For

those

who

wish

to

write

their

own

software

to

use ex-

panded

memory, all

15

values (0

to

E)

can

be used as

the

X

variable

as long as

the

resulting

port

addresses

do

not

con-

flict

with

other

I/O

devices.

The

contents

of

the

mapping

registers

can

be read

by

doing

an

110 read

from

the

same

address

location

they

were

written

to.

The

following figure represents

how

the

contents

of

the

mapping

registers

can

be used:

Bit 7

0:

page disabled

1:

page enabled

LSB

XXXXXXX

\

Bits

~

0-127: maps

one

of

the

128 16K

size pages

of

EMS

memory

from

the

RAM

3000 Deluxe board

into a window.

Figure

14:

Mapping

Registers

77