RC2014 Micro

The RC2014 Micro is a 32k Z80 based single board computer which runs either Microsoft BASIC or Steve Cousins SCM monitor ROM.

This is essentially a cut down version of the RC2014 Mini, with things like the Pi Zero connector, power socket and LED, and keyboard connector removed. This smaller component count not only reduces the price, but also the size of PCB required, so it matches the RC2014 module appearance.

The RC2014 Micro includes a very short and to the point assembly guide, but a more detailed assembly guide can be found here

Click image for pdf schematic

Whilst the RC2014 Micro is a full RC2014 computer in it’s own right, there are a few upgrades which you might want to consider before you start to assemble it. For example;

  • Add chip sockets. This will reduce the likelihood of damage to the ICs whilst soldering and also allow some limited upgrades at a later date.
  • Use 3 pin straight headers and jumpers for the ROM select pads. This will let you access all 8 of the 8k banks on the ROM – not that there is anything else hidden away on the ROM, of course. Or is there…?
  • Use a 2 pin header and jumper for the FTDI Power pads. That way, if you are powering your RC2014 Micro from the expansion header, you can still use a FTDI cable for serial communication.
  • Add a 40 way right angle pin header on the RC2014 Expansion Bus. This allows you to connect your RC2014 Micro to a Backplane 5, Backplane 8 or Backplane Pro, and expand it’s capabilities with some of the other RC2014 modules. Alternatively, use a 40 pin socket for a single module to be added.

If you chose to add a header and connect your RC2014 Micro a backplane, there are a lot of modules which will expand its capabilities, such as the Digital Input, Digital Output, Joystick, ESP8266 Wifi, YM2149 Sound Card, Prototype board, or many of the 3rd party modules designed for RC2014. Shown below is a RC2014 Micro plugged in to a Backplane 5 with a Pi Zero Serial Terminal and a Digitial I/O Module, allowing it to be used with just a monitor and USB keyboard.

Note that if you are powering your RC2014 Micro from a backplane, you should not power it from a FTDI cable at the same time.

Bill of materials

  • 1 RC2014 Micro PCB
  • 1 Z80 CPU
  • 1 27C512 EPROM
  • 1 62256 RAM
  • 1 MC68B50
  • 1 74HCT04
  • 1 74HCT32
  • 4 1k resistor
  • 1 1M resitor
  • 1 2k2 resistor
  • 1 3k3 resistor
  • 1 7.3728 Mhz Xtal
  • 2 22pf ceramic cap
  • 6 100nf
  • 1 Tactile Switch
  • 1 3 pin ra header
  • 1 6 pin ra header
  • 1 jumper