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CSA Mega-Midget Racer User Manual

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COMPUTER SYSTEM ASSOCIATES, INC.
7564 Trade Street
San Diego, Calif. 92121
(619) 566-3911
Mega-Midget Racer™
User's Manual
QUALITY MICROPROCESSOR ENGINEERING

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Summary of Contents for CSA Mega-Midget Racer

  • Page 1 COMPUTER SYSTEM ASSOCIATES, INC. 7564 Trade Street San Diego, Calif. 92121 (619) 566-3911 Mega-Midget Racer™ User’s Manual QUALITY MICROPROCESSOR ENGINEERING...
  • Page 3 Computer System Associates, Inc. (CSA) Mega-Midget Racer™ Accelerator User’s Manual (For Commodore Amiga A500/A1000/A2000 Series Computers) Mega-Midget Racer™ User’s Manual...

  • Page 5: Table Of Contents

    Trouble Shooting the Mega-Midget Racer™ ......20 The contents of this manual are copyrighted by Computer System Associates, Inc. (CSA). All Rights reserved. No part of this manual may be reproduced in whole or in part without the express written permission of Computer System Associates, Inc.

  • Page 6: Introduction

    W h e n i n s t a l l e d i n t h e C o m m o d o r e - A m i g a A 5 0 0 a n d A 2 0 0 0 s e r i e s computers, the Mega-Midget Racer is ideally suited for programs like Byte by Bytes’...

  • Page 7: Product Warranty

    C o m p u t e r S y s t e m A s s o c i a t e s , I n c . ( C S A ) w a r r a n t s t o t h e o r i g i n a l purchaser that CSA’s computer products shall be free from defects in m a t e r i a l a n d w o r k m a n s h i p f o r a p e r i o d o f 9 0 d a y s f r o m t h e d a t e o f o r i g i n a l p u r c h a s e .
  • Page 8 Repair Any product returned to CSA for repair must be accompanied by a Return Material Authorization (RMA) number issued in advance by CSA. Product returns will not be accepted without a valid RMA number clearly showing on the outside of the package.

  • Page 9: Theory Of Operation

    3. Theory of Operation The CSA Mega-Midget Racer accelerator replaces the MC68000 CPU in the Amiga and utilizes an MC68030 microprocessor as its main CPU. The MC68030 is operated asynchronously to the Amiga system, which allows the Mega-Midget Racer to operate at many frequencies. This asynchronous operation requires that the accelerator must provide a synchronous bus i n t e r f a c e t o t h e A m i g a s y s t e m .

  • Page 10: Mega-Midget Racer Features

    Replaces Amiga’s MC68000 CPU: The Mega-Midget Racer is a direct, plug-in replacement for the MC68000 CPU in the Amiga A500 or Amiga A2000. To assure 100% software compatibility, the MC68000 is re-installed on the Mega-Midget Racer accelerator and becomes software and hardware selectable.

  • Page 11: Preparing The Mega-Midget Racer For Installation

    Prior to performing the procedures below, check to see that all packing materials (including any foam material) are removed from the accelerator. 1) Position the Mega-Midget Racer facing you so that the letters ASSY 21103B and component lettering can be read normally.
  • Page 12 U5. To Operate the Mega-Midget Racer without an FPU 5) To operate the Mega-Midget Racer without an FPU (MC68881 or MC68882), the position of the black shorting block on the JP3 jumper does not matter. We suggest that you place it according to paragraph 3 above.

  • Page 13: Installation In The Amiga A500

    1. Position the MC68000 in the 64-pin socket on the Mega-Midget Racer accelerator so that the polarity semi-circle of the MC68000 is aligned with the polarity semi-circle of the 64-pin socket.
  • Page 14 Note that the words Mega-Midget Racer (marked in white ink on the front of the board) go toward the front of the A500 motherboard. The large chip ( M C 6 8 0 3 0 ) w i l l b e o n t h e r i g h t s i d e a n d f a r t h e s t f r o m t h e A m i g a expansion port.

  • Page 15: Installation In The Amiga A2000

    With the front of the computer facing you locate and remove three group C screws (see CSA drawing # 01242). e. Rotate the computer until you are facing the rear of the unit. Refer to CSA drawing #01242 to locate and remove four (4) Group B screws.
  • Page 16 64-pin socket. This assures that pin 1 of the MC68000 is next to the symbol R23 on the Mega-Midget Racer. k. Carefully insert the Mega-Midget Racer board into the Amiga MC68000 socket so as not to bend or break any pins. Be very careful to make sure that all board pins are inserted in the A2000 MC68000 socket before applying final seating pressure to the Mega-Midget Racer board.

  • Page 17: Csa Mega-Memory™ 32-Bit Dram Daughter-Board

    The MC68030’s Memory Management Unit (MMU) may be used to copy the Amiga’s operating system ROM kernel into the 32-bit DRAM memory for those users who do not have CSA’s 32-bit SRAM installed on the Mega- Midget Racer accelerator. If SRAM is installed, the user may choose to enable the SROM feature, which puts the Amiga ROM kernel into the SRAM without the use of the MC68030’s MMU.
  • Page 18 DRAM chips and accelerator board components. 2) Be sure that only CSA recommended DRAM chips of the correct specifications are used. If you have any doubts about the chips you intend to use, call CSA on the technical hot-line (619) 566-3923 for assistance.
  • Page 19 W5 and W6. Use the access time of the slowest DRAM chip installed to ensure proper operation (the slowest chip has the largest access time). DRAM chips with access times greater than 100ns cannot be used with the CSA Mega-Memory DRAM daughter-board.
  • Page 20 (next to where the A501 expansion is located), may need to be bent up and flattened. This is easily accomplished with a pair of pliers. This completes installation of the CSA Mega-Memory DRAM daughter- board. If you have any questions, contact CSA on the Technical Hot-Line at (619) 566-3923 for assistance.

  • Page 21: Mega-Midget Racer Software Installation And Usage

    Midget Racer’s resources. This includes determining which processor and co-processor are installed, and configuring, testing, and installing any 32-bit RAM. The CSA-MMR program should be run from the CLI or Shell, or put in the startup- sequence on a bootable disk. The command-line syntaxes for proper program invocation...
  • Page 22 DRAM controller, tests the DRAM memory, and adds the DRAM to the system as fast memory. The clock frequency of the Mega-Midget Racer is needed to properly configure the DRAM controller. The default is 25.00 MHz and can be specified as any value between 20.00 and 33.33 MHz.
  • Page 23 Switch_CPU: (Icon) The Switch_CPU program allows the user to switch the Mega-Midget Racer from the MC68030 mode to the MC68000 mode. The Amiga computer is rebooted during this process, which allows an alternate operating system to be loaded, if desired (some game programs do this).

  • Page 24: Trouble Shooting The Mega-Midget Racer

    10. Trouble Shooting the Mega-Midget Racer™ FUNCTIONAL PROBLEMS: Symptom: Accelerator does not function, will not boot-up, system crashes when using the “68020 Analyzer.” Check: Jumper block W4, if 68000 is installed on the accelerator. Fix: Remove the “E Sync” jumper if 68000 is installed.
  • Page 25 Set jumper block W1 to position 2. For additional information on SRAM speeds and other jumper settings, please contact CSA at (619) 566-3923. Check: CSA-MMR program is present in the start-up sequence and is properly adding SROM, SRAM and DRAM if they are installed.
  • Page 26 CSA/CSA-MMR DRAM 33.33 return After the DRAM is installed as above, click anywhere within the CSA MMR window. The “free memory” located on the menu bar at the top of the monitor screen shows the amount of CSA 32-bit memory installed and any other memory to indicate the total Amiga memory available.
  • Page 27 Mega-Midget Racer™ accelerator. To add the CSA-MMR diskette software to vour hard drive: With the Mega-Midget Racer™ installed, turn on the Amiga™ and place the CSA-MMR diskette in df0. Immediately when boot-up and hard-drive access starts, simul- taneously press the Ctrl and D keys thereby interrupting the start-up sequence.
  • Page 28 PROCEDURE TO USE 2.0 OPERATING SYSTEM WITH THE CSA-MMR T h e C S A M e g a - M i d g e t R a c e r ™ a c c e l e r a t o r u t i l i z e s C B M ’ s 2 . 0 Operating System in much the same way that it uses the earlier 1.3...
  • Page 29 CSA at (619)566-3923. The contents of this manual are copyrighted by Computer System Associates, Inc. (CSA). All Rights reserved. No part of this manual may be reproduced in whole or in part without the express written permission of Computer System Associates, Inc.
  • Page 30 D E V S / M o u n t l i s t d e v i c e u s i n g l : F a s t F i l e S y s t e m ) a M A S K m u s t b e used when CSA’s 32 bit memory, either SRAM or DRAM, is installed and is being used as “Fast RAM”...
  • Page 31 FIGURE 1. Mega-Midget Racer™ Component Installation Insert MC68000 in socket U7 with polarity mark as shown. Insert MC68030 in socket U10 with polarity mark as shown. Insert MC68881/882 in socket U9 with polarity arrow as shown. Insert crystal oscillator in sockets U5/U6 with polarity dot as shown.

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