2) Build the firmware using assemble.sh (macOS/Linux) - this will also try to burn the main ROM using Minipro. Dependencies: [CC65] (https://github.com/cc65/cc65) and a way to burn the ROM's.
3) Source the IC's - the spirit of this project is to contribute as little as possible to the global IC shortage and get used chips locally or from Ebay/AliExpress/etc.
5) Solder away. If you can solder 0805 components(poorly), you should be fine. Some optional components (the microUSB connector, the 3v3 regulator, and the RF-module) require a bit more skill.
6) For the PS/2-keyboard I use the 6522's Shift Register, PB6, and a 74xx74 flip flop. See my R1 Hardware overview at 7:46: https://youtu.be/w5cA64xof2I?t=466 This is now included on the board - instead of a PS/2 connector which can be harder to source I went with a USB-A-connector. Keyboard plugs straight into the board.
Then uncomment ;BASIC := 1 (Remove the ";") and run assemble.sh - this will let you run BASIC by pressing F4.
To change settings for BASIC, values can be changed in defines_abn6502.s
Also, please note that the current code assumes VRAM starts at $0800 rather than the default $2000 in the schematic - resistors will have pads for configuring in the next build, but for now it requires jumpers.