The pioformat formatter driver requires a print formatter to contain the following function routines:
| Item | Description |
|---|---|
| initialize | Performs printer initialization. |
| lineout | Formats a print line. |
| passthru | Passes through the input data stream without modification or formats the input data stream without assistance from the formatter driver. |
| restore | Restores the printer to its default state. |
| setup | Performs setup processing for the print formatter. |