RETIRED: This product has been retired as it can now be purchased from the Pick'n'Mix range. SC110 is also available as a complete kit.

This PCB houses a Z80 serial I/O (SIO/2) device (Z84C42xxPEG) and a Z80 counter/timer (CTC) device (Z84C30xxPEG), and is designed for use with the RC2014 retro computer.

The Z80 SIO/2 provides two serial ports. Port A is fixed at 115200 baud, when running the RC2014 at 7.3728 MHz, while Port B's baud rate is software controllable.

The CTC provides four counter/timer channels. Channel 1 is used to control the baud rate of serial port B. Channel 2 provides a periodic timer tick. Channels 0 and 3 are available for connection to USER pins on the bus, allowing them to be used for general counting and timing, or to generate Z80 mode 2 interrupts for devices that can no do it themselves.

The module provides support for Z80 mode 2 interrupts, with the IEI and IEO signals available on a two pin header for linking with flying cables. These signals can also be optionally connected to the RC2014 bus with jumpers.

Features

• Two serial ports
• Four counter/timer channels
• Tight address decoding
• Easy access to input and output signals on header pins or bus pins
• Interrupt daisy chain signals can be jumpered to bus or use flying leads

Documentation

This product has a user guide (PDF), which includes component sourcing and assembly instructions. This can be found in the documentation link below. PCB design files can be found at EasyEDA.com, where you can download Gerber files and order boards.

Notes

• This product is supplied as a PCB only. Components shown in the photographs must be sourced separately.
• It is your responsibility to pay any import duty or taxes charged by your home country.
• My products are made in accordance with the "designed for RC2014" labelling scheme.
• RC2014 is a trademark of RFC2795 Ltd.
• This product is designed for hobby use and is not suitable for industrial, commercial or safety critical applications.