Volex TTX2000 S Issue 1.2: Routine at 0A4C

0A4C: Release_mosaics_code: Handle release mosaics code.

Used by the routine at decode_row.
release_mosaics_code	0A4C	XOR A	Clear hold_mosaics_flag and jump to hold_mosaics.
	0A4D	LD (hold_mosaics_flag),A
	0A50	JR hold_mosaics