Project to replace CTC

CTC (U4) is typically not populated in Z80retro, so this is a project to replace CTC with basic baud rate generation for 57600 and 2400 baud clocks and reuse CTC space for expanded I/O functions. The expanded functions are I2C, SPI/SD, WS2812B driver, and DS1302 RTC.

Prototype schematic

CPLD design files

CPLD design file in PDF schematic

Memory map: $40 is I2C, $41 is SPI, $42 is WS2812, $43 is RTC

Display ASCII table, scrolling

Game of Life

Test for 8x8 WS2812 panel

Analog clock