RETIRED: This product has been retired as it can now be purchased from the Pick'n'Mix range. SC108 is also available as a complete kit.

This PCB houses a Z80 CPU, 128k bytes of RAM, 32k bytes of ROM, an oscillator and a reset chip (DS1233).

By combining these functions on a single circuit board you can save several module slots, whilst maintaining compatibility with standard RC2014 software, such as CP/M.

The ROM will typically contain the Small Computer Monitor v1.0 configuration R3, which includes SCMonitor, ROM BASIC and a CP/M loader. Alternatively, it can contain other RC2014 ROM based software, but there are no jumpers to select which image is run, so it can only run the one at the start of the ROM.

This module is not as flexible as the official modules (Z80 CPU, 64k RAM and Paged ROM) but it takes less backplane slots, has no configuration hassle and is potentially more reliable as it is all on one PCB.

To run standard RC2014 CP/M you can use this module, plus an SIO module (official or compatible third party) and the official Compact Flash module (with a prepared Compact Flash card).

Features

• Z80 processor
• 128k bytes of RAM
• 32k bytes of ROM (EPROM)
• ROM can be paged out to give 64k bytes RAM
• RAM can be paged to give access to the second 64k
• On-board 7.3728 MHz oscillator (optional)
• LED indicates if the ROM is paged in
• Compatible with Small Computer Monitor configuration R3
• Compatible with standard RC2014 CP/M distribution
• Tight address decoding on ROM/RAM page select (0x38)

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.