====== ACIA Select 256b ======

The Status, Control, TX, and RX registers of a Motorola MC6850 or Hitachi HD6350 Asynchronous Communication Interface Adapter (ACIA) are mapped into this 256 byte page.

The ACIA has 4 registers accessible through 2 memory mapped input/output (MMIO) addresses.

A read from $EB00 will return the content of the ACIA Status register.

A write to $EB00 will update the ACIA Control register with new configuration.

A read from $EB01 will return received byte from the ACIA RX Data register.

A write to $EB01 will update the ACIA TX Data register with a new byte to transmit.

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