INDEX

1234h	99, 167
24 Hour Flag	154, 167
32.768 Khz Oscillator	15
320 x 200 Graphics	25
640 x 200 Graphics Mode	26
640 x 350 Graphics Mode	27
8087-2 Numeric Data Processor	1, 136

Absolute Key Token	109, 164
ACE (8250) Registers	176
Active Video Display page	166
AMSTRAD PC 640K (Vv.i) message	171
Asynchronous Communications Element test	101
Attribute Byte (Color)	22
Attribute Byte (Monochrome)	24
Attribute Controller Address Register	35
Attribute Controller	35

Bad Sector Markers	141, 142
Baud Rate Selector	144
Break Byte	109, 166
BREAK Command	220
BUFFERS Command	221

Central Processing Unit (CPU)	1
Centronics Compatible Port	16
Centronics Interface Connector	79
CGA Color Select Register	66
CGA CRTC Display Addressing	68
CGA Mode 6845 CRTC Emulation	67
CGA Mode Control Register	64
CGA Status Register	67
Character Plane Mapping	42
Character set A/B Select	22, 40, 41
Character set Select Register	40
Check keyboard and mouse	171
Clock Mode Register	39
Color Alpha Display	21
Color Graphics Adpater Compatible Registers	64
Color Graphics Display	24
Color No Care Register	48
Color Plane Compare Register	44
Color Plane Enable Register	37
Color Plane Read Register	46
Color Plane Select Register	39
COMMAND.COM	264
Counter 1 initialisation	10
Country Dependent Information	226
CRC Error	137
CRTC Initialisation Data	159
CRTC Mode Register	60, 64
CRTC Offset Register	59
CRTC Overflow Register	53
Ctrl " [Keys]: Key Actions	108
Current Video Color Select byte	166
Current Video Mode Byte	165
Current Video Mode Control Byte	166
Cursor Address Buffer	166
Cursor End Byte	166
Cursor End Register	55
Cursor Location Low Register	56
Cursor Location High Register	56
Cursor Start Register	54
Cursor Start Scan Byte	166

Danish Keyboard	244
Danish ROS Messages	173
Data Rotate Register	45
DDM	12, 92, 136
DEBUG Utility Program	265
Default Video Mode	12, 92, 136
DEVICE Command	221
Diagnostic Mode	19, 173
Direct memory Access Controller test	100
Direct memory Access	5
Disk Bootstrap Interrupt	153
Disk Controller Error	137, 141
Disk I/O Interrupt	137, 140
Disk Parameter Table	160
Disk Write Protect Error	137
Display Selector Switch Settings	91
DMA Controller (8237A-4) Registers	179
DMA Initialisation	7
DMA over 64K boundary (Disk I/O Error)	137, 141
DMA Overrun Error	137
DMA Page Registers	6
DMA	5
Dot Clock Rate	39
Drive Motor Flag	165
Drive Motor Timeout Counter	165
Drive Not Ready	141
Drive Restore Flag	164
Drive Status Byte	165
DRIVER.SYS	222
DRIVPARM Command	223
Dynamic RAM Refresh	9

ECC Error	141
EGA Compatible Video I/O	121
EGA CRTC Address Register	50
EGA CRTC Mode Register	60
EGA Horizontal Display End Register	50
EGA Horizontal Total Register	50
EGA Mode Compatible Registers	31
EGA Mode CRT Controller Registers	49
EGC Control Register	33
EGC External Control Registers	33
EGC Status Register	34
Enable Set/Reset Register	44
End Horizontal Blanking Register	51
End Horizontal Retrace Register	52
Enable Set/Reset Register	44
End of Track	160
End Vertical Blanking Register	60
End Vertical Retrace Register	57
English ROS Messages	19, 170, 173
Enhanced Function Interrupt	147
Enter Key Translation token	169
Error: External ROM checksum incorrect	98, 171
Error: Faulty ...	172
EXE (Run File)	247, 251
EXE2BIN Utility Program	290
EXIT Command	291
Expansion Bus I/O Channels	4
Expansion Card Connector	88
Expansion Card Interface	86
Extended Graphics Border Register	37
Extended Mode Control Register	29
External Cluster Controllers	5
External Ticker Interrupt	158
Extra RAM size	163

Fatal ROS Messages	172
FCBS Command	224
FDC (uPD765A) registers	191
FDC Command Codes	195
FDC Hardware Conditions	76
FDC Results Buffer	165
FILES Command	225
Filler Byte	161
Firmware	93
Floppy Disk Controller	76
Floppy Disk I/O Interrupt	137
Floppy Disk Interface test	102
Format Bad Track	141
Format Drive	141
Format Track	139, 141
Forward Delete Key translation token	169
French Keyboard	242
French ROS Messages	173

Gap Length	160
German Keyboard	242
German ROS Messages	173
Get Cursor Address	114, 124
Get Key Token (Keyboard I/O Interrupt)	149
Get Light Pen Address	114, 124
Get RTC Date	156
Get RTC Time	155
Get System Clock	154
Get Video Parameters	121, 131
Graphics Controller Address	43
Graphics Controller Registers	42
Graphics Mode Register 1	47
Graphics Mode Register 2	48
Greek Keyboard	245

Hard Disk Call parameters and registers	140
Hard Disk Drive Count	167
Hard Disk I/O Interrupt	137, 140
Hard Disk ROM	2, 3, 140, 174
Head Load Delay	160
Head Settling Delay	161
Hercules 6845 CRTC Emulation	74
Hercules Compatible Register Emulation	71
Hercules Mode Control Register	71
Hercules Mode Register	30
Hercules Monochrome Graphics	72
Hercules Status Register	74
High Resolution (640 x 350) Graphics Mode	26
Horizontal Panning Register	38
Horizontal Total	50, 68, 74, 159

IGA BIOS EGA Mode Initialization	63
IGA Interrupt 16: 'EGA Compatible' Video I/O	121
IGA BIOS Modes	27
IGA Control Registers	28
IGA Extended Mode Control Register	29
IGA ROM Fonts	2, 174
Initial Serial Setup Bytes (NVR)	169
Initialization Stack	162
Initialize disk sub-system	138, 141
Initialize printer port	152
Initialize Serial Port	144
Insert a System disk into drive A	98, 153, 171
Installed RAM Size	13
Internal Graphics Adapter	19
Interrupt 2: Parity Error (NMI)	102
Interrupt 5: Print Screen	103
Interrupt 6: Mouse Button Control	103
Interrupt 8: System Clock Interrupt	104
Interrupt 9: Keyboard Interrupt	105
Interrupt 14: Floppy Disk Controller	110
Interrupt 16: Video I/O	111, 121
Interrupt 17: System Configuration	136
Interrupt 18: Memory Size	136
Interrupt 19: Disk I/O	137
Interrupt 20: Serial I/O	143
Interrupt 21: Enhanced Function Interrupt	147
Interrupt 22: Keyboard I/O	149
Interrupt 23: Printer I/O	151
Interrupt 24: System Restart	153
Interrupt 25: Disk Bootstrap	153
Interrupt 26: System Clock and RTC	154
Interrupt 27: Keyboard Break Interrupt	158
Interrupt 28: External Ticker Interrupt	158
Interrupt 29: Video Parameter Table	159
Interrupt 30: Disk Parameter Table	160
Interrupt 31: Video Matrix Table	161
Interrupt 51: Mouse I/O	208
Interrupt Controller Initialisation	8
Interrupt Levels	8, 9, 96
Interrupt Vector Initialisation	96
Introduction	1
Invalid FDC Opcodes	208
IRGB Color Selection	20, 22
Italian Keyboard	242
Italian ROS Messages	173

Key Codes	81, 105, 174, 240
Key States	150, 163
Key Toggles	150, 163
Key Token Buffer End Address	168
Key Token Buffer Start Address	168
Key Token Buffer	164
Key Tokens	105 - 108
Keyboard and Key Codes	174, 240
Keyboard Break Interrupt	158
Keyboard Buffer status	150
Keyboard I/O Interrupt	81
Keyboard Interface test	102
Keyboard Interface	80
Keyboard Interrupt	105
Keyboard Keycodes	240
Keyboard Layouts	241
Keyboard to Main Board Interface	80
Kill RTC Alarm	158

Language Links	172
LASTDRIVE Command	225
LIB (Library Files)	251
Light Pen Connector	85
Light Pen High Register	58
Light Pen Low Register	58
Line Compare Register	61
Linker Program	247
Load Character Generator	132
Logical Printer Device Base I/O Address	62
Logical Printer Device Timeout Buffer	167
Logical Serial Device Base I/O Address	162
Logical Serial Device Timeout Buffer	168
Low Resolution (320 x 200) Graphics	25

Main Board I/O Channels	3
Main Board to Keyboard Interface	80
MAP (Link Map File)	251
Maximum Scan Line Register	45
MC6845 Compatible Video I/O	111
MDA 6845 CRTC Emulation	70
MDA Compatible Registers	69
MDA Mode Control Register	69
MDA Status Register	70
Medium Resolution (320 x 200) Graphics Mode	26
Memory Layout	2
Memory Size Interrupt	136
Missing Address mark	137, 141
Mode Control Register	36
Monochrome Alpha Display	23
Motor off timeout	160
Motor on Delay	161
Mouse Button Control interrupt	103
Mouse Connector	82
Mouse Cursor	210
Mouse Interface	82
Mouse Software Interfaces	208
Mouse X and Y Count Register test	101
Mouse X and Y direction scaling factors (NVR)	169
MS-DOS System Configuration	220
MS-LINK	247

NDP	1, 136
NMI Disable	11
NMI Mask Control	8
Non-Fatal ROS Messages	171
Non-Volatile RAM	148, 169, 187
Norwegian Keyboard	246
Null Modem Cable	234
Number of Printers Attached	136
Number of Serial Interfaces Attached	136
NVR	148, 169, 187

OBJ (Object File)	251
Optional Games Adapter	136
Overscan Register	37

Palette Registers	20, 36
Paper Out	151
Parallel Printer Interface	78
Parallel Printer Port	16
Parity Error (NMI)	102
Parity Error Disable	11
PC1512/1640 Type Determination	17
PC1640 Power Usage	237
PIC (8259A-2) Command Words	182
PIT (8253) Registers	185
Pixel to Bit Mapping (320 Res)	26
Pixel to Bit Mapping (640 Res)	27
Plantronics Mode Register	31
Please fit new batteries	171
Please Wait .....	99, 170
Port A - Status-1 Input/Keyboard Code	12
Port B - System Control	11
Port C - Status-2 Input	12
Portugese Keyboard	245
Power Connector	90
Power-Up Initialisation and Self Test	94
Power-Up Self Tests	98
Power-Up Test Methods	100
Power-Up Test Procedure	99
Preset Row Sccan Register	53
Print Screen Status Byte	168
Print Screen	103
Printer Acknowledge	151
Printer Connector	79
Printer Control Latch	17
Printer Data Latch	16
Printer I/O Interrupt	151
Printer Idle	151
Printer Lead Wiring	236
Printer Parallel Port test	101
Printer Selected	151
Printer Status Channel	18
Processor Memory Usage	2, 173
Programmable Interrupt Controller test	102
Programmable Interval Timer test	100
Programmable Interval Timers	8
Programmable Peripheral Interface test	101

RAM0 - RAM4	13
RAMDRIVE.SYS	223
Read and Reset Mouse X and Y Counts	147
Read Character and Attributes	116, 126
Read NVR Location	148
Read Pixel (Video Int 16)	120, 129
Read Sectors	138, 141
Read Serial Port	145
Real Time Clock test	101
Real Time Clock	15
Record Not Found (Disk I/O Error)	137
RECOVER Utility Program	292
Reference Information	172
Resident Operating System ROM	2
Return Disk I/O Status	138, 141
Return EGC State	134
Return Key Toggle and Key States	150
Return printer port status	152
rgbRGB (16/64) Color	21, 23
ROM Character Set	238
ROM Firmware Interrupts	96, 102
ROS Checksum Test	100
ROS Interrupt 16: '6845 Compatible' Video I/O	111
ROS Messages	170
RS232 Connections	227
RS232C Asynchronous Serial Port	77
RTC (HD146818) Registers	185

Scroll Screen Down	116, 125
Scroll Screen Up	115, 125
Second Floppy Disk Drive	14
Sector Size	160
Seek Error	137, 141
Send character to the printer port	39
Sequencer Address Register	39
Sequencer Registers	38
Serial Baud Rate Settings	144
Serial Channel Interface	77
Serial Channel Pin Arrangement	78
Serial Clock and Serial Data	80
Serial Connector	78
Serial I/O Interrupt	143
Serial Parity Settings	144
Serial Port Status	146
Serial Stop Bit Settings	144
Set Cursor Address	113, 124
Set Cursor Size	113, 123
Set Display Page	115, 125
Set Palette Registers (Video Int 16)	131
Set PrtSc Vector	134
Set RTC Alarm	157
Set RTC Date	157
Set RTC Time	156
Set System Clock	155
Set Video Mode	112, 122
SHARE Utility Program	293
SHELL Command	225
Size of Ram Disk	169, 223
Soft Reset	108
Spanish Keyboard	243
Spanish ROS Messages	173
Speaker Drive & Modulate	11
Special IGA Registers	11
Special Key Actions	108
STACKS Command	226
Start Address High Register	55
Start Address Low Register	56
Start Horizontal Blanking Register	51
Start Horizontal Retrace Register	52
Start Vertical Blanking Register	59
Start Vertical Retrace Register	57
Status PORT Register	62
Status Register	34, 67, 70, 74
Status-1 Input/Keyboard Code	12
Status-2 Input	12
Step rate	160
SW1 - SW4 Status Read	35
SW6, SW7, SW9 & SW10 Status Read	17
Swedish Keyboard	244
Swedish ROS Messages	173
System Clock and RTC Interrupt	154
System Clock Interrupt	104
System Clock Long Word	154, 167
System Commands Processor	264
System Configuration Interrupt	136
System Configuration Word	136
System Control Port	11
System Interrupts	7
System Memory	2
System RAM test	101
System RAM Variables	161,-,174
System Reset Flag	99, 167
System Reset	15
System Restart Interrupt	153
System Status and Control	10

Then press any key.	98, 153, 171
Time and Date of last usage	169, 171
Time and Date parameters	169, 186
Timer Configuration	10
Total RAM Size	163

UK Keyboard	241
Underline Location Register	59
USA Keyboard	241

Verify Sectors	139, 141
Vertical Display End Register	58
Vertical Interrupt (IRQ2)	57
Vertical Total Register	53
Vertical Total	50, 68, 75, 159
Video AND, OR, XOR, Select	45
Video Buffer Origin & Size	28
Video Connector	89
Video Display Buffer Size Word	165
Video Display Buffer Start Address	165
Video I/O Address Word	166
Video I/O Interrupt	111, 121
Video Matrix Table	161
Video Output Pins	36
Video Parameter Table	159
Video Read/Write Mode	47
Video Screen Buffer	2
Video Status MUX	38
Visible Video Columns Byte	165
VM.TMP	251

Wait States	1
Write Character and Attributes	117, 127
Write Character Only	118, 128
Write Color Palette (Video Int 16)	128
Write Select Register (Video Int 16)	119
Write in TTY emulation mode	120, 130
Write Mask Register	49
Write NVR Location	148
Write Pixel (Video Int 16)	119, 129
Write Sectors	139, 141
Write Serial Port	145
Write System Status	14

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