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README.md: minor changes

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README.md
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@ -6,9 +6,44 @@ Code was rushed in a couple of days.
Sorry.
## Hardware Specifications
- CH32V003F4P6 MCU
- IS31FL3729 matrix LED controller
- 9x RGB LED, one for each character
- White, amber and green LEDs for the cursor
- Adjustment knob to feel like the old times
- 8Kbit EEPROM for storing user configurations
## Manual
User instructions can be found at trueControl BASIC:
User instructions for the addon can be found at trueControl BASIC:
* https://basic.truecontrol.org/database/dc32/retro-tech-gat/
## Building
Firmware is a MounRiver Studio project. You can freely download MounRiver Studio at http://mounriver.com/download
## Flashing
Firmware can be debugged and flashed from within MounRiver Studio using a WCH-LinkE debug probe.
Alternatively, a UART bootloader is available. A Windows flashing utility is provided. The bootloader uses WCHISP protocol, so any WCHISP flash utility supporting CH32V003 should work (untested).
Connect any standard TTL UART into the GAT header in the rear, power with 3V3, then use the flashing utility to load new firmware.
To activate the bootloader, hold down BTN2 while powering on. LED4 (orange) will rapidly flash to indicate the addon is in bootloader mode.
```
RX and TX indicated are from
the point of view of the host
/----| |----\
| TX nc 3V3 |
| RX nc GND |
\------------/
```