The F256 Jr is a 65C02 based system that includes the following features:

512K of Shared System & Video RAM (256k on the Rev A)
256k of flash
256k of cartridge ram/rom
TinyVICKY Graphic Chip (CFP9599)
1x Simple 3-wire UART (RS-232 Port, Feather ESP8266 wifi, or Feather MIDI)
2x Atari Style Joystick Ports, 1x DB9 to interface to NES/SNES Adapter (For Rev B Only)
1x IEC Port to interface to Commodore Drives
2x Internal PSG Sound Chip
2x External SID Sockets

Hardware Setup

The PS2 mouse port may be wired to the keyboard port and then split out using a laptop PS2 splitter.

Kernels

There are two kernels for the Jr.