Retro Tech GAT addon at DEF CON 33. Powered by CH32X033, includes USB, 9x RGBLED and 3x single color LED.

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true f8a987a592 soft I2C implemented, LEDs are now lighting copied over and modified for use my CH59x soft I2C. CH32X GPIO does not have an open drain mode, so I have to implement this with RMW to the mode register. After doing this and adding missing functions needed for existing code, LED writes and EEPROM reads and writes. using the AWU for system timing so the clock speed can change. existing issues: - changing clock speed divider in soft i2c routines causes the system to crash - ADC seems to be reading, but result isn't being used	2025-07-24 06:19:24 -07:00
firmware/retro_tech_fw	soft I2C implemented, LEDs are now lighting	2025-07-24 06:19:24 -07:00
README.md	initial commit of in-progress port	2025-07-24 03:37:26 -07:00

true f8a987a592 soft I2C implemented, LEDs are now lighting

copied over and modified for use my CH59x soft I2C.

CH32X GPIO does not have an open drain mode, so I have to implement this with RMW to the mode register. After doing this and adding missing functions needed for existing code, LED writes and EEPROM reads and writes.

using the AWU for system timing so the clock speed can change.

existing issues:
- changing clock speed divider in soft i2c routines causes the system to crash
- ADC seems to be reading, but result isn't being used

2025-07-24 06:19:24 -07:00

firmware/retro_tech_fw

soft I2C implemented, LEDs are now lighting

2025-07-24 06:19:24 -07:00

README.md

initial commit of in-progress port

2025-07-24 03:37:26 -07:00

README.md

Retro Tech Community GAT

A GAT (v1.69bis compatible) addon for Retro Tech.

Code was ported from code that was rushed in a couple of days.

Sorry.

Hardware Specifications

CH32X033F8P6 MCU (62K Flash, 20K SRAM)
IS31FL3729 matrix LED controller
9x RGB LED, one for each RETRO character
White, amber and green LEDs for the cursor
Adjustment knob to feel like the old times
Up/Down/Press Jogwheel for programming
8Kbit EEPROM for storing user configurations

Manual

User instructions for the addon can be found at trueControl BASIC:

https://basic.truecontrol.org/database/dc33/retro-tech-gat/

Building

Firmware is provided as a MounRiver Studio II project. The MRS2 version originally used v2.20. You can freely download MounRiver Studio at http://mounriver.com/download. The software is in Engrish.

Flashing

Firmware can be debugged and flashed from within MounRiver Studio II using a WCH-LinkE debug probe. Alternatively, firmware can be updated with WCHISPTool or equivalent using the USB connector. At this time no instructions are provided for updates.

If and when there is a firmware update available, update instructions will be provided.