ZRC512, A Hobbyist-friendly Z80 SBC for ROM-less RomWBW

ZRC512 is a faster and hobbyist-friendly variant of ZRC. It is designed specifically for ROM-less RomWBW. Description of ZRC512 online here.

• Z80 at 22MHz
• 512K RAM in 16 banks of 32K
• Compact flash interface
• Altera EPM7128S CPLD
  • 64-byte bootstrap ROM
  • Serial port
  • Decode for RAM, CF, and peripherals
  • I2C interface
  • DS1302 RTC interface
  • WS2812B interface
• RC2014 bus interface
• 5V at 250mA, typical
• 2“x4” 4-layer pc board

Place holder

Schematic

Gerber photoplots

Bill of Materials

CPLD design

• ROMCPLD, 64-byte bootstrap ROM resides in CPLD

ZRC512 Monitor, rev0.3

ROM-less RomWBW for ZRC512

CF disk image of ZRC512 monitor and RomWBW. Unzip this file and use Win32DiskImagers to copy the image to 64meg or larger CF disk

ZRC512 addition to RomWBW source. Future update of RomWBW should include these files. This zip file includes a command file “BuildZRC512.cmd” and a directory “ZRC512” that go into RomWBW\Source directory.

Driving WS2812 NeoPixel LED. The linked page describe the operation for bit-bang WS2812 LED. A demo program included.

Disk image of ZRC512 + VGARC to support standalone computer with monochrome text VGA display and PS2 keyboard.

Discussion about ZRC512 on Google forum. There were informative discussions about different flavors of WS2812D starting from Dec 19 2023.