128-port controller
The 128-port controller also provides hardware support for terminal-attached printers.
The 128-port controller has the following virtual printer attributes:
| Item | Descriptor |
|---|---|
| y1 | Sets the maximum characters per second (CPS) rate at which characters are sent to the print device. The rate should be just below the average print speed for your printer. Consult your printer's documentation for print speed. |
| y2 | Sets the maximum number of print characters the device driver places in the output queue. Reducing this number increases system overhead. Increasing this number delays operator keystroke echo times when the terminal-attached printer is in use. |
| y3 | Sets the device driver estimate of the size of the terminal-attached printer's input buffer. After a period of inactivity, the driver bursts the designated number of characters to the printer. Consult your printer's documentation for input buffer size. |