Changes
The software was a ROM version of Pace's terminal utility, [[Commstar]]. This was a user-friendly program with standard [[XModem]] file transfer functions. However, one foolish design decision was the idea of using a 24x80 screen with a single-line status display - though presenting a good user interface, this forced the use of software rather than hardware scrolling, making the interface unusable for terminal emulation at any speed above 2400 baud.
== I/O Ports ==
FADCh Amstrad RS323 Z8470 (Z80 DART) Channel A Data (R/W)
FADDh Amstrad RS323 Z8470 (Z80 DART) Channel A Control/Status (R/W)
FADEh Amstrad RS323 Z8470 (Z80 DART) Channel B Data (R/W)
FADFh Amstrad RS323 Z8470 (Z80 DART) Channel B Control/Status (R/W)
FBDCh Amstrad RS323 8253 Baudrate Timer 0 Channel A TX Clock (R/W)
FBDDh Amstrad RS323 8253 Baudrate Timer 1 Channel A RX Clock (R/W)
FBDEh Amstrad RS323 8253 Baudrate Timer 2 Channel B RX/TX Clock (R/W)
FBDFh Amstrad RS323 8253 Baudrate Timer 0-2 Control Registers (W)
Note: Some interfaces might use a Z80 SIO (which is backwards compatible to the Z80 DART).
== 8250 ==
