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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.
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.
Board Archive pages here.
PCB Layout: :boards:sbc:z180_mark_iv:markiv-brd-2.0-008.pdf
Parts List: :boards:sbc:z180_mark_iv:mark_iv-parts_list-2.0-008-rev.txt
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.