Vendors:
http://www.dsapsc.com/what-is-sid.html – SID99 add a SID soundchip to your TI
https://dnotq.io/f18a/f18a.html – F18A vga VDP replacement
https://shift838.fwscart.com/ – Geneve keyboard adapters, drive select boards, geneve scart adapters and more
https://www.arcadeshopper.com/ – Software, Hardware, Cables and adapters. TIPI, Flashrom99, SAMS, USB Keyboard adapters, Extended Basic 27 suite, RXB and much more.. new games, multi-carts etc