reZet80 DEV

The reZet80 DEV is my first Z80-based project that builds the foundation for all other reZet80 projects.
It's a development system for the low-level Z80 retro enthusiast and my proof of concept.
It uses CMOS technology, has a simple memory layout and provides 16-bit I/O for hardware experiments.
16- and 20-key keypads are used as input and 16x1 and 20x4 LCD displays as output devices.

System description:

• reZet80 DEV - a barebone Z80 development system

Software:

• reZet80 deMon (debug Monitor)

CPU card:

• A minimalistic Z80 CPU board

• CPU board and CPUBUS specs UPDATE

Memory:

• A simple 64 KiB ROM / RAM board

• 64 KiB ROM / RAM board UPDATE

I/O:

• The I/O board

• I/O board UPDATE

Reset circuitry:

• reset the reZet80 system

• reset board UPDATE

Display:

• 8-digit 7-segment LED display

• Connecting to a 20x4 LCD display

• 16x1 LCD display

Keypad:

• 20-key keypad

• 16-key keypad

RTC (real-time clock):

• 4-bit real-time clock (RTC)

• RTC UPDATE

Last but not least:

• The simplest variant of a backplane