retroduino

Open hardware 8051-based arduino-compatible microcomputer

Features

• Arduino-mega compatible pinout
• AT89S8253 based
• 32kB RAM for data memory
• 32kB RAM for program code
• 32kB EEPROM for non-volatile program code
• build-in bootloader (booting from ROM, copy EEPROM to RAM and run)
• USB PC connection (fast program code loading directly to RAM or to EEPROM)
• external data bus for external peripherals

PCB

Electric diagram

Project purpose

• “because you can”

Programming

• recommended SDCC compiler

Memory layout

Program bus

• 0x0000-0x2FFF - internal flash with bootloader
• 0x8000-0xFFFF - external program code memory

  Data bus

• 0x0000-0x00FF - internal ram
• 0x0100-0x7FFF - external peripherals
• 0x8000-0xFFFF - external data memory

TODO

• external boards with digital and analog input/outputs
• PC application to loading code to the retroduino board
• bootloader with code loading, flashing, coping and app running
• example firmware applications