Routines
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08DF: clear_receive_rows: Clear all rows except header in page receive buffer.
Used by the routines at enter_subcode_and_clear and select_channel.
clear_receive_rows 08DF PUSH BC Preserve registers.
08E0 PUSH DE
08E1 PUSH HL
08E2 LD HL,(page_receive_buffer_pointer) Fill 1160 bytes with $20 (space character) from byte 40 of page receive buffer (clear rows 1-30).
08E5 LD BC,$0028
08E8 ADD HL,BC
08E9 LD D,H
08EA LD E,L
08EB INC DE
08EC LD BC,$0487
08EF LD (HL),$20
08F1 LDIR
08F3 POP HL Restore registers and return.
08F4 POP DE
08F5 POP BC
08F6 RET
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