SC131, v1.0, Description

SC131 is a pocket-sized Z180 computer running RomWBW CP/M.

SC131 next to a Compact Flash card (for scale)

The SC131 PCB can be enclosed in a Hammond 1593N case or used naked.

SC131 main PCB

File storage is provided by a Micro SD card which is accessible from the rear of the case.

Micro SD card adapter installed above the main PCB

SC131 includes two 5-volt asynchronous serial ports which are accessible from the rear of the case.

Hardware features

  • 1 x Z180 processor clocked at 18.432 MHz.
  • 1 x 512k byte RAM.
  • 1 x 512k byte Flash (ROM), typically containing RomWBW.
  • 2 x Serial ports, asynchronous, 5-volt, with software selectable baud rates.
  • 1 x SPI port, primarily for SD card mass storage.
  • 1 x Power LED.
  • 1 x Status LED.
  • 1 x Reset LED.
  • 1 x Voltage supervisor and reset device (DS1233).
  • 1 x Push button reset switch.
  • Printed circuit board size 101.6 mm x 66.14 mm.
  • The case measures 111 mm x 75 mm x 25 mm.

Software support

  • RomWBW, configuration SCZ180_sc131. This configuration supports an SD card for mass storage.

RomWBW is the primary OS for SC131, providing a robust CP/M implementation.

Design options

SC131 is available in a number of different designs.

Homebrew 8-bit retro computing