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SYS68K/CPU-40/41 USER'S MANUAL
FORCE COMPUTERS
2-14
block_number:
If any data have to be read from a block oriented device then this entry specifies the number of
the block where to start reading the number of blocks specified by count. In case of a character
oriented device this entry is negligible.
In particular, the entry block_number is interpreted in different ways depending on the certain
device driver: a device driver dealing with a block oriented device will use this entry to determine
the block number where to start reading the number of blocks specified by the entry count. In
contrast to the mentioned above, a device driver dealing with a character oriented device will
only consider the information contained by the entry count.
read_mode:
The read mode specifies the conditions under which the READ command has to be carried out. As
shown in Figure 4 it contains one flag to specify the mode of operation. This flag is valid for all
device drivers. The usage of all reserved flags is device driver dependent. For further information
please refer to the detailed description of the device driver.
The WAIT flag controls whether the READ command has to be carried out either in the wait or
the status mode. If this flag is set, the wait mode is selected. In this case the corresponding
device driver does not inform the application about the completion of the command until all data
blocks or bytes have been read properly or a fail state causes to terminate the operation before
all required data have been transferred.
In the status mode - the WAIT flag is cleared - the device driver reports the successful completion
of the command only if just as much blocks or bytes are already available as specified by
count and transfers the data to the specified buffer. If the number of available data blocks or
bytes is less than the required number, the device driver reports an error but enters the number
of the data blocks or bytes currently available into the entry count of the Command Control
Buffer used to issue the READ command to the device driver. Thus, the application can use this
information to read all available data by a subsequent READ command.
Figure 4: The read mode
31
30
29
28
27
0
WAIT
RESERVE
RESERVED
RESERVED
RESERVED
!!!
RESERVED
D
Содержание SYS68K/CPU-40
Страница 2: ...INTRODUCTION...
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Страница 8: ...SYS68K CPU 40 41 USER S MANUAL FORCE COMPUTERS 1 2 Figure 1 1 Photo of the CPU Board...
Страница 9: ...SECTION 1 INTRODUCTION 1 3 Figure 1 2 Block Diagram of the CPU Board...
Страница 33: ...SYS68K CPU 40 41 USER S MANUAL FORCE COMPUTERS 2 20 Figure 2 1 Location Diagram for All Jumperfields...
Страница 34: ...SECTION 1 INTRODUCTION 2 21 Figure 2 2 The Front Panel of the CPU Board...
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Страница 42: ...INSTALLATION...
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Страница 57: ...HARDWARE USER S MANUAL...
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Страница 70: ...SYS68K CPU 40 41 USER S MANUAL FORCE COMPUTERS 2 4 Figure 2 2 Location Diagram of Jumperfields B17...
Страница 83: ...SECTION 3 HARDWARE USER S MANUAL 3 13 Figure 3 2 Location Diagram of the System EPROM Area...
Страница 92: ...SYS68K CPU 40 41 USER S MANUAL FORCE COMPUTERS 3 22 3 5 6 Location Diagram of Jumperfield B16...
Страница 95: ...SECTION 3 HARDWARE USER S MANUAL 3 25 Figure 3 5 Location Diagram of the Backup Supply Jumperfield B1 and B20...
Страница 98: ...SYS68K CPU 40 41 USER S MANUAL FORCE COMPUTERS 3 28 Figure 3 6 Location Diagram of the Boot EPROM...
Страница 104: ...SYS68K CPU 40 41 USER S MANUAL FORCE COMPUTERS 3 34 Figure 3 7 Location Diagram of the 0S S Resistors R563 to R569...
Страница 107: ...SECTION 3 HARDWARE USER S MANUAL 3 37 Figure 3 11 Location Diagram of RS232 Configuration Jumperfields B3 B4 B5 and B6...
Страница 110: ...SYS68K CPU 40 41 USER S MANUAL FORCE COMPUTERS 3 40 Figure 3 12 Location Diagram of the 0S S Resistors R563 to R569...
Страница 133: ...SECTION 3 HARDWARE USER S MANUAL 3 63 Figure 3 24 CPU Board Front Panel and Rotary Switch Positions...
Страница 141: ...SECTION 3 HARDWARE USER S MANUAL 3 71 Figure 3 25 Location Diagram of Header B12...
Страница 152: ...SECTION 3 HARDWARE USER S MANUAL 4 3 Figure 4 1 Front Panel of the CPU Board...
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Страница 172: ...SECTION 3 HARDWARE USER S MANUAL 6 17 Figure 6 2 Location Diagram of Jumperfield B19...
Страница 179: ...SYS68K CPU 40 41 USER S MANUAL FORCE COMPUTERS 6 24 Figure 6 4 Location Diagram of B13...
Страница 181: ...SYS68K CPU 40 41 USER S MANUAL FORCE COMPUTERS 6 26 Figure 6 6 Location Diagram of Jumperfield B13...
Страница 183: ...SYS68K CPU 40 41 USER S MANUAL FORCE COMPUTERS 6 28 Figure 6 8 Location Diagram of Jumperfield B2...
Страница 185: ...SYS68K CPU 40 41 USER S MANUAL FORCE COMPUTERS 6 30 Figure 6 9 Location Diagram of Jumperfield B13...
Страница 187: ...APPENDIX TO THE HARDWARE USER S MANUAL...
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Страница 205: ...SECTION 4 APPENDIX TO THE HARDWARE USER S MANUAL E 1 APPENDIX E CIRCUIT SCHEMATICS OF CPU BOARD...
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Страница 207: ...SECTION 4 APPENDIX TO THE HARDWARE USER S MANUAL E 3 E 1 Circuit Schematics of DRM 01...
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Страница 209: ...SECTION 4 APPENDIX TO THE HARDWARE USER S MANUAL E 5 E 2 Circuit Schematics of SRM 01...
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Страница 213: ...SECTION 4 APPENDIX TO THE HARDWARE USER S MANUAL F 3 Location Diagram for All Jumperfields...
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Страница 228: ...COPIES OF DATA SHEETS...
Страница 229: ...COPIES OF DATA SHEETS RTC 72423 DUSCC 68562 PI T 68230...
Страница 230: ...USERS NOTES...
Страница 231: ...USERS NOTES...
Страница 232: ...USERS NOTES...
Страница 233: ...OPTIONS APPLICATIONS MODIFICATIONS...
Страница 234: ...INTRODUCTION TO VMEPROM IN USE WITH THE SYS68K CPU 40 41...
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Страница 268: ...APPENDIX TO THE INTRODUCTION TO VMEPROM...
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Страница 319: ...THE APPLICATION COMMAND INTERFACE PROGRAMMING GUIDE...
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