Editing POKEY (section)

===SEROUT $D20D Write===
Serial port data output byte.

{| class="wikitable"
|-
! Bit 7 !! Bit 6 !! Bit 5 !! Bit 4 !! Bit 3 !! Bit 2 !! Bit 1 !! Bit 0
|-
| - || - || - || - || - || - || - || - 
|}

This is a parallel "holding" register for the eight bit (one byte) value that will be transferred to the serial shift register for output one bit at a time. When the port is ready to accept data for output a Serial Data Out interrupt informs the Operating System that it can write a byte to this output register.