Official Hardware Versions

Official FujiNet hardware designs are open source and released in the fujinet-hardware repository. This page documents the evolution of FujiNet hardware across all supported platforms.

Platform Overview

timeline
    title FujiNet Hardware Timeline
    section Atari 8-Bit
        v1.0 : Initial release
             : Custom SIO plug and receptacle
             : ESP32-WROVER 16MB Flash, 8MB PSRAM
        v1.3 : 74LS07 buffers on SIO lines
             : QFN CP2102 USB-UART bridge
             : Safe Reset button
        v1.5 : Flashing reliability fixes
             : ESD protection diodes
             : SD card pull-up resistors
        v1.6 : SD Card Detect pin
             : Improved motor control
             : New SIO receptacle pins
        v1.7 : USB-C replaces MicroUSB
             : 220uF bulk capacitor on SIO 5V
    section Apple II
        FujiApple Rev1 : SmartPort interface
                       : DB19 connector
    section Other Platforms
        Commodore : IEC bus interface
        CoCo : Tandy Color Computer support

Atari 8-Bit

Version 1.7 (Current)

Changes from v1.6:

Replace MicroUSB with USB-C port
Add 220uF bulk capacitor to SIO 5V

Version 1.6

Changes from v1.5:

Add SD Card Detect pin on GPIO 15
Change SIO 5V voltage divider for better accuracy
Run Motor Control signal through buffer
- 10K pullup on ESP side Motor Control
- 2K pulldown on Atari Side Motor Control
New SIO Receptacle pins for better fit with all SIO cables
Case changes:
- Increase screw hole size
- New plug without mounting holes
- Tighter tolerance for SIO plug with added supports
- Modified 3D printed receptacle for new pins
- New external antenna case designs (requires U.FL/IPEX connector and correct resistor placement on ESP32 WROVER module)

Version 1.5

Changes from v1.3:

Flashing problem fix:
- Add resistor divider on CP2102 VBUS
- Add CP2102 capacitors
- Connect CP2102 VIO to VDD
- Change auto-reset pull-up resistors from 1k to 10k
- Change auto-reset/EN capacitance to 4.7uF
Add ESD (TVS) protection diodes for USB input
Change USB port footprint to use slots
Add 4.7k pull-up resistor to SIO_DATAIN
Add 10k pull-up resistors for microSD card
Change SIO AUDIO_IN resistor to 10K for softer SAM output

Version 1.3

Note: This hardware version contains a bug that prevents some computers from upgrading FujiNet firmware. A hardware fix can be applied to these boards.

Changes from v1.0:

SIO lines connected to ESP32 through two 74LS07 buffers
P and N channel transistors turn off 74LS07 when FujiNet is powered off, separating the ESP32 from the Atari
Switch to QFN 24 CP2102 USB-to-UART bridge
Hard reset button moved to SMD Snap Dome (optional)
Safe Reset button (handled in firmware) replaces Hard Reset button
New power switch with 3D printed slide cover
Remove always-on solder jumper
Add pull-down for MOTOR for cassette emulation
JTAG port removed; signals available as test points

The original FujiNet design features a custom SIO plug that connects directly into any Atari 8-bit computer, with a custom SIO receptacle on the back for daisy-chaining other Atari peripherals. The heart of FujiNet is an ESP32-WROVER module with 16MB Flash and 8MB PSRAM.

Feature	Description
Processor	ESP32-WROVER, 16MB Flash, 8MB PSRAM
Storage	MicroSD socket (right side)
Connectivity	Custom SIO plug and receptacle, MicroUSB
Power	Via SIO connector or MicroUSB

Buttons

Button	Short Press	Long Press	Other
A (Left)	Disk swap	Enable/disable SIO2BT mode
B (Middle left)	Cassette emulation on	Safe reset (unmounts SD before reboot)	Double tap: serial debug info. Hold during power-up: reset config
Hard Reset (Right)	Hardware reset

LED Indicators

LED	Color	Function
Left	White	WiFi status
Middle left	Blue	SIO2BT mode
Right	Orange	SIO activity

Version Changelog Summary

Version	Key Changes
v1.0	Initial release with custom SIO plug, ESP32-WROVER, MicroSD, 3 buttons, 3 LEDs
v1.3	74LS07 buffers, QFN CP2102, Safe Reset button, power switch
v1.5	Flashing fixes, ESD protection, SD card pull-ups
v1.6	SD Card Detect, improved motor control, new SIO receptacle
v1.7	USB-C port, bulk capacitor on SIO 5V

Apple II - FujiApple Rev1

The FujiApple Rev1 is the official Apple II FujiNet hardware. It interfaces with Apple II computers via the SmartPort protocol using a DB19 connector. Compatible systems include the Apple IIc, IIc+, and IIGS (which have SmartPort built in), as well as Apple II+ and IIe with a SmartPort-compatible controller card such as the BMOW Yellowstone.

Purchase options:

FujiNet.online

FujiNet Documentation