Slot saving design with a Z80 SIO/2 and a Z80 CTC on one board for RC2014.

This module houses a Z80 SIO/2 chip, which provides two TTL serial ports for use with FTDI style serial adapter cables, and a Z80 CTC, which has four counter/timer channels.

The main features of this module are:

• Full Z80 mode 2 interrupt support (IEI/IEO daisy-chain)
• Two TTL serial ports for use with FTDI serial adapter cables
• Software control of port B’s baud rate
• Source of bus clock (option) to potentially reduce board count
• Z80 mode 2 interrupt generation for two external devices
• Counting and timing functions