Modern Commodore PET replicas using FPGAs, and sporting USB, SD-Card, serial IEC, RS232, Joystick, Dual SID, SPI, and I2C extensions to the original PET. https://6502.org/users/andre/ultipet/index.html
usb65 - a USB stack for the 6502
A USB stack for the 6502 CPU, supporting keyboards and mice for now, as well as a USB hub. Hardware supported are the SL811HS and the MAX3421E, as controller and as device https://github.com/fachat/usb65 https://github.com/fachat/cbm_usb
BDOS - bridge to the PC for the C128
A project to read and write PC floppy disks on the C128's 1571 disk drive. Was a project of the month in the German 64er magazin. https://6502.org/users/andre/bdos/index.html
GeckOS 6502 operating system
A preemptive multtasking operating system for 6502 computers. It started on my Commodore PET replica with MMU, but can now also run on the C64 and C128. https://6502.org/users/andre/osa/index.html
CS/A65 Euro-PCB based Commodore PET replica
A PET replica I started in 1989 using Euro-PCBs and a backplane. The PET got extended by an MMU, and now features a plethora of I/O and other boards. https://6502.org/users/andre/csa/index.html