IBM 4400 EndLoadCode-Hex1For6F, Using the EVFU

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Chapter 9P-Series EVFU
EndLoadCode-Hex1For6F
The end load code terminates the memory load program. The end load code
ishex 1Fwh en the PI signal line is disabled (low) or hex 6F when the PI line is
enabled (high). Channel codes in excess of 192 channels received prior to the
end load code are discarded.
Using the EVFU
Once the EVFU program has been enabled and loaded, sending the
appropriate channel code to the printer causes any data in the buffer to prin t
and positions the paper to the next line on the form having the specified
channel number assigned in EVFU memory.
For a data byte to be recognized as an EVFU instruction, the following criteri a
must be met:
•The PI signal line must be enabled and set high; and
•Databit 5 must be 0 (not set).
OR:
•The PI signal line must be disabled or low; and
•Data bit5 must be 1 (set).
Given these conditions, the lower four bits of a byte specifies the EVFU
channel number. Table 77 lists the EVFU channels and their equivalent data
bytes with the PI signal line enabled; Table 78 lists the EVFU channels and
their equivalent data bytes with the PI line disabled.