Z180 Mark IV single board computer

The Z180 Mark IV is a single board computer]], meaning it may run stand-alone. It also has an interface to the RetroBrew bus (ECB)]] for access to additional peripheral boards.

As a stand-alone computer, the Mark IV has:

  1. A Z180 cpu up to 33Mhz. Using an 18.432Mhz oscillator, the newest Z180 processors are easily overclocked 2X to 36.864Mhz.
  2. 512k of static RAM memory. Up to 1Mb of EPROM, or up to 512k FLASH memory.
  3. Date/time clock with battery backed NVRAM (DS1302). Backup power is usually provided by a 0.22F super-capacitor.
  4. Terminal connection through an RS-232 port using an IBM-PC serial port 10-pin header.
  5. Twisted pair FDX communication through an RJ-12 (6P4C) modular jack.
  6. A Secure Digital (SD) card slot. Standard, HC, and XC cards are supported by ROM firmware.
  7. A 40-pin IDE connector which supports 8-bit transfers, and is usually used with a Compact Flash card Master/Slave adapter.

Power is supplied to the Mark IV SBC through the ECB bus, or through a 4-pin Molex connector (PC/AT disk drive power connection). The board operates using +5V power only.

last edit: 2016-02-21

Board Archive pages here.

ROM images

The UNA BIOS was developed on the Mark IV, and was updated to version 2.1 in January 2017. The distributed images contain Will's port of CP/M 2.2.

See: software/ firmwareos / una / binaries for the binary (.tgz and .zip) and source files.

Wayne's RomWBW is also distributed for this board.