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The ACIA 6551 is an RS232 interface chip. VICE emulates RS232 connections
via /dev/ttyS* (Unix) or COM: (DOS/WIN - not yet?).
When saving a snapshot, those connections are of course lost.
The state of the ACIA however is restored if possible. I.e. if a connection
is already open when restoring the snapshot, this connection is used
instead. If no connection is open, a carrier/DTR drop is emulated.
Version numbers: Major 1, Minor 0.
| Type | Name | Description |
| BYTE | TDR | Transmit Data Register |
| BYTE | RDR | Receiver Data Register |
| BYTE | SR | Status Register |
| BYTE | CMD | Command Register |
| BYTE | CTRL | Ctrl Register |
| BYTE | INTX | 0 = no data to tx; 1 = Data is being transmitted; 2 = Data is being transmitted while data in TDR waiting to be put to internal transmit register |
| DWORD | TICKS | Clock ticks till the next TDR empty interrupt |