Hewlett-Packard 64000 Absolute Format, Code 89 - Data I/O UniSite-xpi User Manual

Hewlett-Packard 64000 Absolute Format, Code 89

Figure 6-16
An Example of HP 64000 Absolute Format
HIGH
ORDER
END-OF-FILE
RECORD
ONE DATA
RECORD
START-OF-FILE
RECORD
UniSite-xpi User Manual
Hewlett-Packard Absolute is a binary format with control and
data-checking characters. See Figure 6-16.
LOW
ORDER
End-of-File record consists only of a word count of 0.
Checksum
Data bytes
Address where following data byte is to be stored.
BYTE COUNT — number of 8-bit data bytes.
WORD COUNT — number of 16-bit words in record except checksum and itself.
CHECKSUM — modulo 256 sum of all bytes in the record except the first byte.
TRANSFER ADDRESS — for microprocessor program counter.
DATA WIDTH BASE — see text.
DATA BUS WIDTH — see text.
WORD COUNT — number of 16-bit words in the record; always 04 in
Start-of-File record.
Note: This format is binary. Therefore, no ASCII control characters
or carriage returns and line feeds are allowed.
Data files begin with a Start-of-file record, which includes the Data Bus
Width, Data Width Base, Transfer Address, and a checksum of the bytes
in the record.
6. Translation Formats
32-bit address
Third Byte
is sent in this
MSB
LSB manner, in 4
Second Byte
groups of 8-bit
bytes.
0088-2
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