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SYS68K/CPU-40/41 USER'S MANUAL
FORCE COMPUTERS
2-18
block_number:
If any data have to be written to a block oriented device then this entry specifies the number of the
block where to start writing 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 writing 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.
write_mode:
The write mode specifies the conditions under which the WRITE command has to be carried out.
As shown in Figure 5 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 WRITE 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 written 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 can be written to the device as specified by count and transfers the data to the specific
device from the buffer. If the number of data blocks or bytes which can be written to the device
is less than the required number, the device driver reports an error but enters the number of the
data blocks or bytes, that could be written to the device, into the entry count of the Command
Control Buffer used to issue the WRITE command to the device driver. Thus, the application can
use this information to write the possible amount of data to the device by a subsequent WRITE
command.
Figure 5 The write mode
31
30
29
28
27
0
WAIT
RESERVE
RESERVE
RESERVE
RESERVE
!!!
RESERVED
D
D
D
D
Summary of Contents for SYS68K/CPU-40
Page 2: ...INTRODUCTION...
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Page 8: ...SYS68K CPU 40 41 USER S MANUAL FORCE COMPUTERS 1 2 Figure 1 1 Photo of the CPU Board...
Page 9: ...SECTION 1 INTRODUCTION 1 3 Figure 1 2 Block Diagram of the CPU Board...
Page 34: ...SECTION 1 INTRODUCTION 2 21 Figure 2 2 The Front Panel of the CPU Board...
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Page 42: ...INSTALLATION...
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Page 57: ...HARDWARE USER S MANUAL...
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Page 83: ...SECTION 3 HARDWARE USER S MANUAL 3 13 Figure 3 2 Location Diagram of the System EPROM Area...
Page 92: ...SYS68K CPU 40 41 USER S MANUAL FORCE COMPUTERS 3 22 3 5 6 Location Diagram of Jumperfield B16...
Page 141: ...SECTION 3 HARDWARE USER S MANUAL 3 71 Figure 3 25 Location Diagram of Header B12...
Page 152: ...SECTION 3 HARDWARE USER S MANUAL 4 3 Figure 4 1 Front Panel of the CPU Board...
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Page 172: ...SECTION 3 HARDWARE USER S MANUAL 6 17 Figure 6 2 Location Diagram of Jumperfield B19...
Page 179: ...SYS68K CPU 40 41 USER S MANUAL FORCE COMPUTERS 6 24 Figure 6 4 Location Diagram of B13...
Page 187: ...APPENDIX TO THE HARDWARE USER S MANUAL...
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Page 207: ...SECTION 4 APPENDIX TO THE HARDWARE USER S MANUAL E 3 E 1 Circuit Schematics of DRM 01...
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Page 209: ...SECTION 4 APPENDIX TO THE HARDWARE USER S MANUAL E 5 E 2 Circuit Schematics of SRM 01...
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Page 213: ...SECTION 4 APPENDIX TO THE HARDWARE USER S MANUAL F 3 Location Diagram for All Jumperfields...
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Page 226: ...SYS68K CPU 40 41 FORCE COMPUTERS I 2 This page was intentionally left blank...
Page 228: ...COPIES OF DATA SHEETS...
Page 229: ...COPIES OF DATA SHEETS RTC 72423 DUSCC 68562 PI T 68230...
Page 230: ...USERS NOTES...
Page 231: ...USERS NOTES...
Page 232: ...USERS NOTES...
Page 233: ...OPTIONS APPLICATIONS MODIFICATIONS...
Page 234: ...INTRODUCTION TO VMEPROM IN USE WITH THE SYS68K CPU 40 41...
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Page 268: ...APPENDIX TO THE INTRODUCTION TO VMEPROM...
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Page 319: ...THE APPLICATION COMMAND INTERFACE PROGRAMMING GUIDE...