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Digital488/80A Power & Assembly 3
Introduction…… 19
Internal Components…… 19
Factory Service…… 19
Power Line & Fuse Configuration…… 20
Line Voltage Selection…… 20
To Select the Line Voltage…… 21
Fuse Replacement…… 22
To Replace the Fuse…… 22
Rack-Mount & Bench-Top Assembly…… 23
Rack Mount…… 23
Bench Top…… 23
Power-Up & Programming Tests…… 24
Power-Up Activation…… 24
Programming Examples……25
KYBDCTRL.BAS Program…… 25
To Run the Keyboard Controller Program…… 25
Digital488/80A Command Responses…… 26
Introduction
Internal Components
The heart of the Digital488/80A is a 6809 microprocessor [U1] supported by 8K bytes of firmware
EPROM [U2] and 32K bytes of battery-backed-up RAM [U3]. Interface to the IEEE 488 bus is
accomplished by a 9914 interface chip [U13]. A 65B22 [U14] generates real-time interrupts for the
firmware operating system and also drives the front panel LED indicators. The digital I/O ports are
controlled through 6821 interface chips [U7, U8, U9, U10, U11, U16]. High-voltage, high-current output
capability is provided on both channels if the HVCX1 option is used. Power is supplied by an on-board
transformer and full-wave rectifier. Regulation to the required +5 volts is provided by an 78T05CT [U15].
The memory space allocation on the Digital488/80A is:
Address Device Part Number Function
$0000-$7FFF U3 84256 32K x 8 RAM
$8010-$8014 U7 68B21 Digital I/O
$8020-$8024 U8 68B21 Digital I/O
$8040-$8044 U9 68B21 Digital I/O
$8080-$8084 U10 68B21 Digital I/O
$8100-$8104 U11 68B21 Digital I/O
$8200-$8204 U16 68B21 Digital I/O
$8800-$8810 U14 65B22 Timer, Digital I/O
$9000-$9907 U13 TMS9914A IEEE 488 Interface
$E000-$FFFF U2 2764 Programmed EPROM
Factory Service
Chapter 7: Troubleshooting provides a troubleshooting reference for possible solutions to technical
problems. Before calling for technical assistance, refer to this chapter.
However, if problems in using the Digital488/80A still persist, you should contact the factory. Many
problems can be resolved by discussing the problems with the appropriate applications department. If the
problem cannot be solved by this method, you will be instructed as to the proper return procedure.
Digital488/80A User’s Manual Digital488/80A Power & Assembly 19
- User's Manual 1
- Introduction to this Manual 3
- Table of Contents 4
- 7 - Troubleshooting 5
- A - Appendix A 5
- B - Appendix B 5
- Digital488/80A Overview 1 7
- Accessories 8
- Specifications 9
- CAUTION 10
- Data Transfer Speeds 10
- Digital488/80A Setup 2 11
- Hardware Setup 12
- Default DIP Switch Settings 13
- Addressing Mode Selection 13
- Secondary Address Settings 14
- HVCX1 Option Setup 16
- WARNING 16
- Digital I/O Ports 23
- Introduction 25
- Line Voltage Selection 26
- Fuse Replacement 28
- Rack Mount 29
- Bench Top 29
- Power-Up Activation 30
- Programming Examples 31
- C0 is in use 33
- C) command C5 was executed 33
- Digital488/80A Operation 4 35
- Clear (Pin 41) 36
- Data Strobe (Pin 42) 36
- Trigger (Pin 36
- Inhibit (Pin 44) 37
- Service (Pin 45) 37
- External Data Ready (Pin 46) 37
- IEEE 488 Bus Support 38
- Bus Addresses 40
- Bus Terminators 40
- IEEE 488 Background 5 41
- Bus Lines & Bus Commands 42
- Handshake Lines 43
- Data Transfer Lines 43
- Bus Command Groups 44
- More On Service Requests 45
- Digital488/80A Commands 6 47
- Command Syntax 48
- Command Set & Support 49
- Command Summary 50
- - SRQ on Ready 51
- Command Reference 52
- A - Bit Set 53
- B - Bit Clear 54
- C - Configuration 55
- D - Data Output 56
- E? - Query Error Status 57
- F - Data Format 59
- G - Bus Input/Output 63
- H - Handshake 64
- I - Invert 65
- K - End-Or-Identify 66
- L - Buffer 67
- M - Service Request Mask 68
- O - Recall Configuration 69
- P - Port Select 70
- Q - Inhibit 71
- R - Data Ready 72
- S - Save Configuration 73
- T - Test 74
- U - User Status 75
- V - View Configuration 78
- V? - View Version 79
- X - Execute 80
- Y - Bus Terminator 81
- ? - Query 82
- Serial Poll Status Byte 83
- Troubleshooting 7 85
- Buffer Overrun 86
- Query Error Status 86
- Appendix A A 87
- Software Setup 88
- Appendix B B 91
- IEEE 488 Bus Commands 92
- ASCII Codes 93
- ASCII Code Details 95
- Abbreviations 104
- Notes 106
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