SweABCext

SweABCext is an ABC-bus add-on for ABC80 and ABC800. An RP2350B answers the bus as Luxor 4680 disk controllers (MO, MF, SF, HD, and XD) and as memory expansion. Raw 256-byte-sector images live on a microSD card. USB is a command line, and mass storage when emulation is off.

SmartAid, SuperBASIC, and UFD-DOS images are built into flash. A file under /abcrom/ on the card replaces a built-in image when that file is present.

Hardware on the site is KiCad revision 1.00 (renders, not a photo of a built board yet). Repository: ABC80/sweabcext.