Saturday, August 22, 2026

reZet80 SENTINEL R1 released

The second reZet80 SENTINEL release R1 is out!
Documentation, screenshots, source code, technical specifications and ROM images as always at GitHub

10 games are included (6 action games and 2 text adventures plus 2 more):
  • New Camel Race game
  • New Dino Chase game
  • New Donkey Race game
  • New Obstacle Runner game
  • New text adventure The Lighthouse
  • Enhanced Asteroid Belt game
  • Enhanced Black Jack game
  • Enhanced Haunted House text adventure
  • Enhanced Hex Invaders game
  • Hex Man (Hexadecimal Hangman) game
  • RV command (show release version)
  • reZet80 custom character splash screen
  • additional LCD displays 40x1 and 16x2
  • 128 KiB RAM divided into 4 memory banks
  • lower-case letters
The hardware runs on a breadboard.

What's next?
Work on the memory cartridge has begun for R2.
I'm also experimenting with a file system and DOS-like commands.
Maybe I'll also introduce a tiny disassembler in R2, too.
Not quite sure about 16x4 and 20x4 but 40x4 displays are pretty cool.
I'm thinking about replacing some support ICs with a PAL or GAL chip (R3 or later).