While on the research for my latest 6502 achievment, the CP/M65 operating system for my KIM-1, I noticed on the projects homepage a tiny hint about a little computer system called SORBUS. (Sorbus is a tree having fruits called "Vogelbeeren" - Birdberries)

It turned out to be the simpliest 6502 Single Board Coputer you can imagine: A 65C02 processor and a pico pi microprocessorboard handling I/O, tact, RAM and ROM. In fact it was so simple that I could imagine to build one of theese little devices myself. Look here: https://github.com/SvOlli/sorbus

1(!) day later and totally random I was in a thread at forum64 and SvOlli, the creator the SORBUS was announcing, he had 5 systems as kit left. What should I say: five days later I got the kit per mail and 5.25 days later I have it assembled on my desk 😁.

Why is the system so simple? because the Pi pico is able to handle 5V on the I/O, so it is able to communicate with the 6502 processor without any levelshifter.

Three "Systems" are available for the SORBUS:

1. Apple-1 rebuild
2. Monitor Command Prompt: MCP
3. Native Core utilizing an internal flash drive

The Apple-1 works with the output to the serial line, I've tested some programs from john's Apple-1 software collection (https://github.com/GrantMeStrength/Apple1-Software) and everything worked.

The MCP ( https://xayax.net/sorbus/examples_mcp.php ) is a learning system for 6502 processors

The native Core comes with CP/M65, MS BASIC, TIM, WOZMON and a Filebrowser for the 24 mb onboard flash drive.

CP/M 65

MS-BASIC with File load / save

TIM - Terminal Interface Monitor by C.Holdt for MOS in 1975

Apple-1 Demo 30 years A1