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Table of Contents
ZRC512, A Hobbyist-friendly Z80 SBC for ROM-less RomWBW
Introduction
ZRC512 is a faster and hobbyist-friendly variant of ZRC. It is designed specifically for ROM-less RomWBW. Description of ZRC512 online here.
Features
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
Theory of Operation
Place holder
Design Information
ROMCPLD, 64-byte bootstrap ROM resides in CPLD
Software
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.
Manuals
Online discussions
Discussion about ZRC512 on Google forum. There were informative discussions about different flavors of WS2812D starting from Dec 19 2023.