| Routines

0EDF: THE 'CLEAR PRINTER BUFFER' SUBROUTINE

Used by the routines at COPY_LINE and NEW. The printer buffer is cleared by calling this subroutine.
CLEAR_PRB | 0EDF | LD HL,$5B00 | The base address of the printer buffer.
| 0EE2 | LD (IY+$46),L | Reset the printer 'column' at PR-CC.
| 0EE5 | XOR A | Clear the A register.
| 0EE6 | LD B,A | Also clear the B register (in effect B holds 256).
PRB_BYTES | 0EE7 | LD (HL),A | The 256 bytes of the printer buffer are all cleared in turn.
| 0EE8 | INC HL
| 0EE9 | DJNZ PRB_BYTES
| 0EEB | RES 1,(IY+$30) | Signal 'the buffer is empty' (reset bit 1 of FLAGS2).
| 0EEF | LD C,$21 | Set the printer position and return via CL_SET and PO_STORE.
| 0EF1 | JP CL_SET