IBM 4400 manual VFU Load/Save/Clear, When the VFU is selected but not loaded

Chapter 9 General P-Series EVFU Programming Information

Paper Runaway Protection—

•When the VFU is selected but not loaded:

If a VFU command is sent from the host computer, then the printer moves the paper a single line feed only.

•When the VFU is selected and the memory has been loaded:

If a channel code is sent from the host which is not a part of the assigned sequence currently in memory, then the printer moves the paper a single line feed only.

Line Spacing —The printer can use any line spacing with the VFU. The VFU determines the forms length according to the program specifications and the currently selected line spacing. Line spacing may be mixed on the same form, but should be done with caution to avoid unpredictable results.

VFU Deselected —If any VFU is deselected from the control panel, the VFU data are ignored and the forms length definition returns to the previously-set value. The current print position becomes the top-of-form.

VFU Load/Save/Clear

One VFU table can be saved in Non-Volatile Memory (NVM) at a time. The VFU table format is: VFU type, lpi, and VFU channel data.

Load — Upon printer power-up or printer reset, a previously saved VFU is loaded if the saved VFU table matches the VFU type. Upon loading the VFU, lpi is set to the value stored in the VFU table if the saved VFU was loaded using the 6 or 8 lpi DVFU or NVFU Start Load code.

Save — From the control panel, VFU TABLE SAVE writes the current VFU table into Non-Volatile memory. Skip-over perforation and forms length values are not saved from this selection.

Clear — The VFU can be cleared by any of the following:

•Pressing ENTER at the VFU TABLE CLEAR configuration menu

•Sending a Reset control code (SFCC @) in the printer data stream

•Changing the printer protocol

•Changing VFUs

•Loading parameters

•Loading a new VFU format

When DISABLE is selected as the VFU type, the previously-loaded VFU data is not cleared and is still in effect if reselected.

272