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Print Server Manual 65 A741
Normally, the FIFO test described in the Command: “t” section is the best FIFO
test to use. The “d” and “f” commands are included in case a “lower level” test is
needed.
16.12 Command: “f”
This command is used to see what data is currently stored in the Littlebear on-
board FIFOs. LBTEST will prompt for how many bytes to read. This value can
be from 0 to 200000 decimal.
LBTEST will read data from the FIFOs beginning at the next address to be read.
The first 40 bytes the are read will be displayed on the screen. All of the bytes
that are read will be stored in the file called “DMA.TST”. Note that LBTEST will
display that a register is being written during this command. This register needs
to be written with a certain value so that data can be clocked out of the FIFO.
LBTEST does this automatically and there is no need to write any registers
manually.
Normally, the FIFO test described in the Command: “t” section is the best FIFO
test to use. The “d” and “f” commands are included in case a “lower level” test is
needed.
16.13 Command: “t”
This command is used to perform four “high level” tests.
The “p” (Print) test will instruct the copier to print out a 16” X 16” checkerboard
test pattern. Everything is done automatically by LBTEST to complete this test
print. The progress of the print will be displayed as the print proceeds. LBTEST
will print up to 200 copies of this test pattern. Data for the test pattern will be
downloaded to the copier for each of the copies.
The “s” (Scan) test will instruct the copier to scan in a plot. This plot can be any
size; however, LBTEST will only read 18” of length data. The data from the scan
is stored in two files. The first file, “TEST.FIL”, is 1 bit/pixel data. The second
file, “TEST2.FIL”, is translated from “TEST.FIL” into 8 bits/pixel data.
“TEST2.FIL” is optional, and will only be created after LBTEST prompts if this file
is to be created (and the user enters ‘Y’). These files are not compressed, so
they may be very large. “TEST2.FIL” may be as large as 100 MB. These files
may be viewed using an image viewer.
The “b” (test Button) test will perform the exact test that the test button on the
Littlebear controller card performs. After entering this command, LBTEST will
return immediately to the main screen.
If the print engine is not captured after 90 seconds, the test pattern will not be
printed, and the controller will resume its normal operation. If the engine is
captured, a test pattern will be printed.
The pattern that is printed is not the same as the pattern that is printed using the
“p” test described above. The test button pattern is 8.5” wide, centered, and has
a 1” margin on the bottom of the plot. This pattern is generated entirely by the
controller hardware, and looks like several rows of small spikes.