16550 UART Board Rev B
This is the Rev B version of the 16550 UART Board for the RC2014.
The top 3 changes are:
- Use of port addresses C0H-FFH to avoid collision with the default 68B50 UART
- Use of 74HCT03 open collector gates, particularly to drive the /INT signal line so that it can be shared with other devices that also drive the interrupt line.
- Availability of the 16550's OP1 and OP2 lines to a pin header for general use e.g. to generate an audio signal or page switch RAM/ROM etc.
This design has been tested with a PC16550CN.
PCBs are available from OSH Park at:
A BIOS will be available soon.