RETIRED: This product has been retired as it can now be purchased from the Pick'n'Mix range. SC102 is also available as a complete kit.

This PCB houses a Z80 counter/timer (CTC) device (Z84C30xxPEG) and is designed for use with the RC2014 retro computer.

The Z80 CTC provides four counter/timer channels and this board provides a range of input and output options for each channel.

Each channel has the following input options:

• Bus clock CLK
• Bus clock CLK2
• On-board oscillator
• Bus user pin

The bus CLK2 signal can be optionally linked to:

• CTC channel 0 output
• CTC channel 1 output
• CTC channel 2 output
• On-board oscillator

By connecting CLK2 to a CTC output it is possible to set the baud rate of a Z80 SIO/2 module by writing a suitable value to the CTC.

Each input and output is available on a pin header mounted on the back edge of the board. This header is well suited to linking to prototypes with Dupont cables.

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.

Address selection is by DIP switch, allowing the module to be located on any 4-byte I/O address boundary. The tight and flexible address decoding means many of these modules can be fitted to a single RC2014 computer.

Features

• Tight address decoding
• Address selection via DIP switch
• Flexible input signal selection with jumpers
• Easy access to input and output signals on header pins
• Optional output to RC2014 bus CLK2 signal
• Interrupt daisy chain signals can be jumpered to bus or use flying leads
• On-board clock source which can also be used for the main bus clock

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.