apricot - Al Kossow's Bitsavers

298 Pages·2015·8.72 MB·English

apricot
Service
Manual
apricot
Service Manual
PREFACE
This service manual contains all the information
required for the after-sales service that is required to
maintain the high quality and reliability of the ACT
APRICOT executive micro-computer.
It is assumed throughout this manual that all service
personnel involved in the maintenance of the ACT
APRICOT already have an in-depth knowledge of digital
electronics, with particular emphasis on micro-computer
techniques.
This manual contains information relevant to the
total APRICOT range. Illustrations and photographs used
are of the twin floppy drive version. Please refer to relevant
sections for variations.
ACT (International) Ltd. wishes to acknowledge the
co-operation of the following companies for giving their
permission in allowing the reproduction of their proprietry
information:
SONY (UK) LTD.
National Panasonic (UK) Ltd.
Texas Instruments Ltd.
QED (Product Design) Ltd.
The information in this manual is subject to change
without notice and does not represent a commitment on
the part of ACT. The software description in this manual is
furnished under a license agreement. The software may be
used or copied only in accordance with the terms of the
agreement. It is against the law to copy any disk supplied
for any purpose other than the purchaser's personal use.
© Applied Computer Techniques PLC 1983.
CONTENTS
Chapter
1 General description
Specification
2 Installation
3 Safety precautions
4 Recommended tools and equipment
5 Assembly and disassembly
6 Electrical system
7 Electronic system
Memory map
8 Set-up procedures
9 Trouble-shooting
Diagnostic programs
10 Expansion Boards
11 Winchester
Appendix
A Monitor
B Disk drive
C Parts list
D PSU
E Circuit diagrams, wiring diagrams
Index
INDEX
I
Assembly and Features 1.2
Disassembly 5.1 Fuses 3.2
AC Sub Assembly 6.3 Floppy Disk Controller 7.13
Async Cable
Installation 2.1
Connection 6.19
Interconnection
Block Diagram Apricot 7.22 Diagram 6.2
Conversion 240V -115V 6.4 I/O Section 7.11
Connectors Pin-Outs 6.6 I/O Port Address 7.20
Circuit Diagrams E1 I/C Catalogue 7.23
Disassembly Modem Cable
Rear Panel 5.3 Connection 6.19
AC Sub Assembly 5.4 Memory 7.6
Motherboard 5.5 Memory Map 7.38
Chassis Bridge Monitor A.1
Assembly 5.6 Mnemonics 7.34
Disk Drives 5.7
Parts Description 1.5
Front Bezel and Door 5.8
Printer Cable
Main Chassis 5.9
Parallel 6.20
Power Supply 5.9
Serial 6.21
Handle 5.9
Processor Structure 7.7
Speaker 5.9
Parallel Interface 7.14
Monitor 5.10
Parts List C.1
Keyboard 5.11
Power Supply E.1
5.12
5.13 Recommended Tools 4.1
Diagnostic Recommended
Boot Prom Equipment 4.1
Documentation
Error Codes 9.1 Specification 1.4
Safety Precautions 3.1
Programs 9.5
Disk Drive B.1 System Outline 7.3
Sound Generator 7.11
Electrical System 6.1
Serial Interface 7.18
Earthing 6.5
Set-Up Procedure 8.1
Expansion Information 6.16
Electronic System 7.1 Timer 7.16
G_E_N_E_RA_L_D_E_SC__RIP_T I_ O_N_----.l10
,---_1_
I Features
IT . Specifications
ill Individual units
rn
GENERAL DESCRIPTION
I FEATURES
Processor architecture
8086 running at 5mHz
8089 I/O processor
8087 Optional Maths co-processor
Memory
256 Kbytes expandable to 768 Kbytes
Mass storage
One or two 3.5" Sony mirco-floppy disk drives-
315 Kbytes each
or
One or two 3.5" Sony double sided micro-floppy disk
drives-360 Kbytes each side
Display
9" green P39 phosphor with antiglare filter
80 characters x 25 lines
Resolution: 800 x 400 pixels
1/0
1 x RS232 (V-24) serial port
1 x 8-bit Centronics parallel printer port
Optional on-board modem with auto-dial
2 x expansion slots
1 x "Mouse" port
Keyboard
Soft QWERTY keyboard with 8 fixed function keys
and 6 touch sensitive keys labelled by LCD Micro
Screen (tm).
Built-in 4 function calculator.
Time/Date display with battery back-up.
Safety/radiation standards
Meets UL
VDE
BS415
CSA
FCC-B
1~;~l~1rll
GENERAL DESCRIPTION
II SPECIFICATION
Physical dimensions
Systems box: 16.5" (43.Scm) wide x 4" (10.6cm) high
x 12.5" (33cm) deep
Monitor: 10.5" (27.7cm) wide x 8.5" (22.Scm)
high x 10" (26.4cm) deep
Keyboard: 16" (42cm) wide x 2" (S.3cm) high x
7" (18.Scm) deep
Weight
Systems box: 14.21bs (6.5 kg)
Monitor: 9.11bs (4.1 kg)
Keyboard: 3.31bs (1.5 kg)
Power requirements
200 to 240 VAC 47 to 63 Hz
or
100 to 125 VAC 47 to 63 Hz
Power consumption
100Wat 11SV or 230V input
Temperature range
Operating: 5 to 37°C
Storage: -20 to 60°C
Humidity
Operating: 20 to 80% RH @ 29°C non-condensing
m
G£N£FAL D£SCR{P'1'ION
Ul INDl\TlDtJAL tJNffS 1. Monitor
2. system Unit
ard
3. Reybo
4. Microscreen un
\ s.
Touch Sensitive Reys
\I 6. fiJ{ed function Reys
78.. DBroio~br tness control
2
6~ ~ii~iiilll;I~~'9'
~ \0. Reyboard Cable
11. VRiedyeboo CaraObl ce onnector
12. Centronics connector
13. Serial connector
14. Video connector
15. Mouse port
16. Mains switcb
17. Fuse t
18. Mains lnpU
16
18
."rr---17
9
I~:~}I
GENERAL DESCRIPTION
SYSTEMS UNIT External
1. Systems Base
2. Systems Cover
3. Rear Panel
4. Facia Bezel
5. Door
6. Expansion Plates
7. Handle
8. Base Clip
9. Base Button
10. Keyboard Cable Clips
2
3
~4
8