A later design is now available: SC717

This module houses a Z80 parallel input/output (PIO) device (Z84C20xxPEG) and is designed for use with RCBus retro computers.

The Z80 PIO provides two 8-bit ports, each with handshaking and interrupt capabilities.

The parallel I/O signals are available on a row of header pins on the top edge of the board, and also a double row of pins on the rear edge of the board. The pins on the top are easy to connect to solderless breadboards via dupont cables, while the connector on the rear edge is suitable for connection with a ribbon cable.

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 RCBus 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 RCBus computer.

Features

• Tight address decoding
• Address selection via DIP switch
• Easy access to input and output signals on header pins
• Interrupt daisy chain signals can be jumpered to bus or use flying leads
• Fully functional on 40-pin backplanes
• Works with 40-pin, 60-pin and 80-pin backplanes

Documentation

This product has a user guide and an assembly guide. These documents can be found at www.scc.me.uk or by following the documentation link below.

Compatibility

This module conforms to the RCBus specification v1.0 for RCBus-2014 enhanced 39-pin long modules.

The printed circuit board outline conforms to the RC2014 standard for full height modules.

The module is compatible with all RC2014 backplanes, all RCBus-2014 backplanes (RC2014 compatible including SC100 series) and all full RCBus 80-pin backplanes (including SC700 series). Pins in the second row are provided for consistency and mechanical stability. The interrupt daisy chain can be implemented with Dupont cables if not supported by the backplane.

A similar design SC717 is also available. It is compatible with the RCBus, including the RC2014 standard 40-pin bus, the RC2014 enhanced 60-pin bus and the extended 80-pin RCBus.

The RCBus specification includes RCBus-2014 (both RC2014 standard 40-pin bus and RC2014 enhanced 60-pin bus) and also the full 80-pin RCBus. The 80-pin RCBus provides support for advanced Z80 features, such as the interrupt daisy-chain, as well as support for other processor families.

The kit

This kit includes all the components needed to make the module, as shown in the first picture. Other modules and backplanes shown in the pictures are not included. You will require tools, solder, and cleaning materials to assemble this kit.

Printed Circuit Board

The printed circuit board is available on its own here.

Notes

• This product is supplied as a kit of parts which require assembly.
• 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.