IBM 1220 - Manual (Page 178)

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NPA Mode
Purpose:
To specify whether the printer performs the special processing required for bidirectional
communication, following the conventions defined in the Network Printing Alliance (NPA) Protocol.
Values:
Note: Changing this menu item automatically resets the printer.
Parallel Buffer
Purpose:
To configure the size of the parallel input buffer.
Values:
Note: Changing the Parallel Buffer menu item automatically resets the printer.
See also:
Resource Save
On Printer performs NPA processing. If data is not in NPA format, it is rejected as bad data.
Off Printer does not perform NPA processing.
Auto* Printer examines data and determines the format and then processes it appropriately.
Disabled Disables job buffering. Any jobs already buffered on the disk are printed before
normal processing of incoming jobs resumes.
Auto* Printer automatically calculates the Parallel Buffer size (recommended setting).
3K to maximum
size allowed User specifies the Parallel Buffer size. The maximum size depends on the
amount of memory in your printer, the size of the other link buffers, and
whether Resource Save is set to On or Off. To maximize the range for the
Parallel Buffer size, disable or reduce the size of the serial, infrared, LocalTalk,
and USB buffers.