ACT apricot - 128 Kbyteramexpansionboard; Modem; Options

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OPTIONS

An

alternative

version of

the

3.5

inch

floppy

disk

drive

can be

installed

within

the

System

Unit,

as a direct

replacement

for

the

floppy

disk

drives described above.

This

alternative provides

an

increase

in

the

size of

the

floppy disk

storage space available.

The

alternative

version

uses

80

track

double sided disks

(i.e.

160

tracks

per

disk)

and

also employs

the

same

format,

mode and

sector

size as detailed above. Each disk has

the

capacity

to

store 720 Kbytes of

formatted

data, producing a

corresponding increase

in

total

disk

capacity for a dual

MicroFloppy

disk

drive

system

to

1.44 Mbytes.

128KBYTE RAM EXPANSION BOARD

The

128 Kbyte RAM Expansion Board fits

into

the

expansion

slots

within

the

System

Unit.

Both expansion

slots can

accommodate

the

RAM board,

thus

providing

an

increase

in

the

size of

the

RAM

within

the

Apricot

to

either

384 Kbytes (one board),

or

512 Kbytes (two boards).

MODEM

The

Modem

option

is a

communications

facility to allow

an

Apricot

computer

to

transmit

and

receive

data

via

the

Public Switched

Telephone

Network

(PSTNj.

The

option

is

installed

within

the

Apricot

by

inserting

the

Modem

Board

into

one

of

the

expansion

slots

and

making

a

minor

modification

to

the

rear

panel

of

the

System

Unit

to

replace

the

expansion plate.

The

Modem

Board

consists

of a

modem

and

a

microprocessor

control

system.

The

modem

conforms

to

both

CCITT

V23

and

V21 standards

and

operates

in

anyone

of

the

following software selectable modes:

(a)

Full duplex 1200/75 bps.

(b)

Full duplex

300/300

bps.

(c)Half

duplex

1200/1200 bps.

The

microprocessor

control

system

acts as

the

interface

between

the

modem

and

the

system

processing

elements

on

the

System

Board,

and

also provides

the

Apricot

with

an

Table of Contents

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Service Manual305 pages