Z80 Rev0 Mezzanine Board for EPM240 Dev Board

Note, Rev0 of Z80 Mezzanine board is superceded by rev1.1 of 3V Z80 Mezzanine board

While Z80 is specified for 5V operation, selected CMOS Z80 are capable of running at 3.3V. This mezzanine board hosts such Z80 plus a 512K RAM and plugs on top of the EPM240 development board. The two-board Z80 computer can run RomWBW.

• CMOS Z80 selected for 3.3V operation
• 512K RAM
• 512 byte flash embedded in EPM240 can boot RomWBW
• ACIA emulation in EPM240
• SD card interface
• RTC module based on DS1302
• I2C interface
• RomWBW capable

Boot from embedded 512-byte flash, etc, etc…place holder.

Schematic

Gerber photoplot files

EPM240 design files

• RomWBW SD bootstrap code resided in EP240's embedded flash

EPM240 design files with fast SD bootstrap (6 seconds), but no RAM disk at drive A

Bill of Materials

RomWBW image for 3VZ80. The RomWBW will be booted at power up. It takes 23 seconds to load and boot RomWBW from reset.