Acorn BBC Master 65C102 Manuel utilisateur
Within this publication the term 'BBC' is used as an abbreviation
for 'British Broadcasting Corporation'.
°Copyright ACORN Computers imited 1985
Neither the whole or any part of the information contained in, or
the product described in, this manual may be adapted or reproduced
in any material form except with the prior written approval of ACORN
Computers imited (ACORN Computers).
The product described in this manual and products for use with it,
are subject to continuous development and improvement. All
information of a technical nature and particulars of the product and
its use (including the information and particulars in this manual)
are given by ACORN Computers in good faith. However, it is
acknowledged that there may be errors or omissions in this manual. A
list of details of any amendments or revisions to this manual can be
obtained upon request from ACORN Computers Technical Enquiries.
ACORN Computers welcome comments and suggestions relating to the
product and this manual.
All correspondence should be addressed to:
Technical Enquiries
ACORN Computers imited
Newmarket Road
Cambridge
CB5 8PD
All maintenance and service on the product must be carried out by
ACORN Computers' authorised dealers. ACORN Computers can accept no
liability whatsoever for any loss or damage caused by service or
maintenance by unauthorised personnel. This manual is intended only
to assist the reader in the use of this product, and therefore ACORN
Computers shall not be liable for any loss or damage whatsoever
arising from the use of any information or particulars in, or any
error or omission in, this manual, or any incorrect use of the
product.
This manual is for the sole use of ACORN Computers' authorised
dealers and must only be used by them in connection with the product
described within.
ACORN is a trade mark of ACORN Computers imited
First published 1985
Published by ACORN Computers imited
Cover design concept by Carrods Graphic Design
65C102 co-processor user guide
Part No. 0443,030
Issue No.2
April 1986
CONTENTS
Section Page
INTRODUCTION 3
Dismantling the microcomputer 5
Installing the co-processor printed circuit board 5
SYSTEM MEMORY 9
The 65C102 co-processor support disc 11
INTRODUCTION
What is a co-processor
The job of the co-processor is to run languages such as BASIC,
assembly language, word processing, and to run user programs. The
TUBE handles the two-way communication between the microcomputer and
the co-processor thereby leaving the microcomputer and the co-
processor to continue with their respective tasks.
With the co-processor fitted, the job of the microcomputer is to
serve as an I/O processor, that is, to handle all the inputs and
outputs (keyboard, RS423, text and graphics output to monitors,
printer output, disc drives, cassette recorders, local area network
and so on).
This co-processor consists of a 65C102 microprocessor system with 64
Kbytes of Random Access Memory (RAM). In addition, it contains an
interface between itself and the microcomputer called the TUBE.
From this point on the microcomputer will be referred to as the
I/O processor.
Fitting a co-processor
Note that any modification or upgrade carried out to the printed
circuit board of any Acorn equipment is undertaken at the sole risk
of the person carrying out the modification or upgrade. No claim for
loss or damage to the equipment caused by the modification or
upgrade of the printed circuit board by unqualified personnel shall
be accepted by Acorn Computers limited.
WARNING - A number of the components used within ACORN equipment are
STATIC SENSITIVE. All usual anti-static precautions must be taken to
prevent damage to these devices.
Before attempting this upgrade, please read all the instructions
carefully. If you are in doubt about your ability to carry it out,
the co-processor and the microcomputer should be taken to your
nearest authorised Acorn dealer.
A charge may be levied by the dealer for installing the co-
processor; such a charge shall be entirely at the discretion of the
dealer concerned.
3
FIGURE 1
4
Dismantling the microcomputer
Before attempting to fit the co-processor to your machine, first
ensure that the unit is disconnected from the mains power supply.
The upper half of the case must be removed from the unit to allow
access to the main printed circuit board. To do this, turn the
computer upside down and place it on a firm, flat surface; locate
and remove the four fixing screws that hold the upper half of the
case in place. These screws are located on the underside of the unit,
two at the rear and two at the front of the machine, and are
labelled 'FIX'. Please note that the two fixing screws fitted to the
rear fixing positions are longer than the other two.
When the fixing screws have been removed, carefully re-invert the
computer whilst holding the two halves of the case together. The
upper half of the case may now be removed by lifting it directly
upwards from the machine.
Installing the co-processor printed circuit board
Included in the co-processor upgrade kit are a number of plastic
printed circuit board support posts. These must be fitted to the
main printed circuit board before installing the co-processor board.
The positions at which these posts are to be fitted are shown in
figure 1. The posts should be fitted to the positions in numerical
order. The first four positions are common to all co-processor
options, with positions five and six only in use with certain
co-processors. When fitting the P.C.B supports, ensure that the base
flange does not interfere with any component on the P.C.B. To fit
the support, insert one end into the hole in the P.C.B and press
down gently.
When the support is correctly fitted, it will not be possible to
withdraw it from the hole in the P.C.B. Care must therefore be taken
to ensure the correct positioning of the P.C.B support before
pressing it home.
When all the P.C.B supports are installed on the main P.C.B, the co-
processor should be placed in position ensuring that:
1. The pins of P 1 on the co-processor are aligned with the
corresponding holes in SKI on the main P.C.B.
2. The pins of P 2 on the co-processor are aligned with the
corresponding holes in SK2 on the main P.C.B.
3. The P.C.B supports are aligned with the corresponding holes on
the co-processor P.C.B.
When you are satisfied that all the pins and supports are correctly
aligned, the co-processor P.C.B may be pressed gently into place.
The co-processor is correctly seated when the barbs on the tip of
the P.C.B supports have cleared the surface of the co-processor
5
P.C.B. An audible click should be heard when the barbs spring into
place securing the P.C.B.
Take care not to exert too much pressure when pressing home the co-
processor P.C.B, this may lead to damage to the various connectors.
When the co-processor P.C.B has been installed, the re-assembly
procedure is the reverse of the dismantling procedure.
When the 65C102 co-processor has been installed, the machine should
be set up as described in the WE COME GUIDE. When the machine is
switched on a message, similar to the following, should appear on
the screen.
ACORN MOS
ACORN ADFS
BASIC
>_
As can be seen from the above message, the 650102 co-processor does
not appear to be present. The reason for the apparent abscence of
the co-processor is the CONFIGURATION status of the machine.
To reconfigure the machine to allow for the inclusion of the 65C102
you must use either a *CONFIGURE command, or the control panel
included with the WE COME package. To use the *CONFIGURE command you
should enter:
*CONFIGURE TUBE <RETURN>
followed by
*CONFIGURE INTUBE <RETURN>
after entering these two commands you must perform a hard reset by
holding down the CTR key whilst pressing and releasing the BREAK
key. This reset is needed to enable the I/O processor to recognise
the presence of the co-processor.
After performing the reset, the following message, or something
similar, should be displayed:
ACORN TUBE 65C102 CO-PROCESSOR
ACORN ADFS
BASIC
>_
6
The top line of the display shows that the TUBE and 65C102 co-
processor are now recognised by the machine. If the message on your
machine does not indicate the presence of the 65C102 co-processor
then first use the *STATUS command to determine whether the TUBE is
correctly configured, and assuming that the configuration is correct,
refer to the ealier part of this section to check that the upgrade
has been carried out correctly.
If neither of these courses of action uncover the cause of the
problem, the complete machine should be taken to your nearest Acorn
registered dealer for testing and, if necessary, repair.
7
8
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