RM Nimbus Logo W E L C O M E
Version 3.00C
RM NIMBUS SERVICE MANUAL

RM Nimbus Service Manual
PN 15315

Copyright © 1985, Research Machines


The following material that forms the RM Nimbus Service manual has been kindly released by RM Plc for the purpose of personal research, preservation of museum exhibits, prosperity and non-commercial use.

CHAPTER 1 - INTRODUCTION
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Nimbus Specification
Nimbus BCU Overview
Disk Controller Board
Nimbus Power Supplies
Nimbus Keyboard
Nimbus Mouse
Other Nimbus Products

CHAPTER 2 - NIMBUS BCU CIRCUIT
PART 1 - PART 2 - PART 3 - PART 4

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BCU Block Schematic
iAPX186 and 8086
Gate Array 1
RAM and ROM
Graphics
Gate Array 3
8051
Piconet Transceivers
SIO
Transceiver
AY8910 and Rompack Interface
Voice and Audio Amplifier
I/O Bus Buffers
BCU Connectors
More BCU Connectors
Gate Array 1 - Specification
Gate Array 2 - Specification
Gate Array 3 - Specification
I/O Bus Specification

CHAPTER 3 - FLOPPY AND WINCHESTER DISK SUPPORT
PART 1 - PART 2 - PART 3

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Overview
DCB Interface
Floppy Disk Controller Circuitry
SASI Interface Circuitry
Floppy Disk Drives
Xebec Winchester Controller S1410A
Winchester Drives
DCB port specification

CHAPTER 4 - NIMBUS OPTIONS
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VIEW SCHEMATICS PART 1
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Add on RAM Card
Add on Transceiver
Maths co-processor board 8087
ROM Packs
Mouse
Drive Expansion
SIL Resistor Pull-up boards
Other Nimbus Options

CHAPTER 5 - MONITORS
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Sanyo Monochrome Monitors
Microvitec Colour Monitors

CHAPTER 6 - NIMBUS KEYBOARD
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Key Coding
Rollover
Reset

CHAPTER 7 - NIMBUS POWER SUPPLIES
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Introduction
MVE 50 S1 Power Supply
MVE 100 S6 Power Supply

CHAPTER 8 - NIMBUS TEST SOFTWARE
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NGCPT Nimbus Production Test
NGCFT Nimbus Final Test
RAMPAGE RAM Test Program
TRCVPT Transceiver Production Test
TONETST Sound Diagnostic Test
SNOTI Serial Number and Time Initialiser
DCBF(S)PT Floppy (&SASI) Production Test
DOC186 Floppy Disc Diagnostic Aid
DISCO Floppy Disc Drive Test
WINFORM Winchester Format Program
STAMP Winchester Initialising Program
XFT Winchester Final Test
8087PT 8087 Piggy-back Board Production Test

APPENDIX A - PARTS LIST
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APPENDIX B - NIMBUS PORT ADDRESSES
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