Fairchild Fairbug, Code 80 - Data I/O UniSite-xpi User Manual

6. Translation Formats

Fairchild Fairbug, Code 80

Figure 6-8
An Example of Fairchild Fairbug
6-22
In the Fairbug format, input and output requirements are identical; both
have 8-byte records and identical control characters. Figure 6-8 shows a
Fairbug data file. A file begins with a 5-character prefix and ends with a
1-character suffix. The start-of-file character is an S, followed by the
address of the first data byte. Each data byte is represented by 2
hexadecimal characters. The programmer will ignore all characters
received prior to the first S.
Note: Address specification is optional in this format; a record with no address
directly follows the previous record.
Each data record begins with an X and always contains 8 data bytes. A
1-digit hexadecimal checksum follows the data in each data record. The
checksum represents, in hexadecimal notation, the sum of the binary
equivalents of the 16 digits in the record; the half carry from the fourth bit
is ignored.
The programmer ignores any character (except for address characters and
the asterisk character, which terminates the data transfer) between a
checksum and the start character of the next data record. This space can
be used for comments.
Start Record
S0000
XFFFFFFFFFFFFFFFFC
XFFFFFFFFFFFFFFFFC
XFFFFFFFFFFFFFFFFC
XFFFFFFFFFFFFFFFFC
XFFFFFFFFFFFFFFFFC
XFFFFFFFFFFFFFFFFC
XFFFFFFFFFFFFFFFFC
XFFFFFFFFFFFFFFFFC
XFFFFFFFFFFFFFFFFC
XFFFFFFFFFFFFFFFFC
*
End-of-File Record
The last record consists of an asterisk only, which indicates the end
of file.
S = Start Character
0000 = Address Field
Data Records
X = Data Record Start Character
FF = 2 Hex Characters (1 Byte)
C = Checksum. 1-digit summation
of data in record
0080-2
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