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Acorn BBC Master 65C102 User Manual

Co-processor
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Summary of Contents for Acorn BBC Master 65C102

  • Page 2 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...
  • Page 3 65C102 co-processor user guide...

  • Page 4: Table Of Contents

    CONTENTS Section Page INTRODUCTION Dismantling the microcomputer Installing the co-processor printed circuit board SYSTEM MEMORY The 65C102 co-processor support disc...

  • Page 5: Introduction

    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...

  • Page 7: Dismantling The Microcomputer

    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;...
  • Page 8 CTRL 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 >_...
  • Page 9 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.

  • Page 11: System Memory

    The *CONFIGURE command The *CONFIGURE command may be used to enable and disable the TUBE communications. It may also be used to select between internal and external TUBE communication. enable disable TUBE communication, *CONFIGURE with TUBE or NOTUBE respectively may be used.
  • Page 12 program from disc, you would type: *RUN GRAFPRG <RETURN> The program would be loaded back into the co-processor rather than the I/O processor (no leading 'FFFFs' in the load address and end address), and would run. To save the resulting picture onto disc, you would have to save the screen memory used in MODE 1, this resides in the I/O processor.

  • Page 13: The 65C102 Co-Processor Support Disc

    IMPORTANT: only filing systems that recognise these extended' addresses. Current versions of BASIC an HI-BASIC make no such distinction. Only the memory in the co-processor can be directly accessed from BASIC. This means that using the ?,! and $ indirection operators to access memory locations in the I/O processor from the co-processor doesn't work, for example: ?&FFFF2000=&55 <RETURN>...
  • Page 14 To use either HiBASIC or HiEDIT, insert the 65C102 support disc into the disc drive and enter: *HiBASIC <RETURN> (or) *HiEDIT <RETURN> depending on the language you wish to use. Printer buffer utility On the 65C102 Support Disc, along with HiBASIC and HiEDIT, you will find a file called BUFFER.
  • Page 15 This buffer uses RAM in the I/O processor between &4000 and &8000 and should not be used where your own application makes use of this area of I/O memory. Since the area of memory used by the printer buffer utility is the same as that available to the user when a co- processor use;...