WD1793 Floppy Disk Controller Hardware FPGA Emulator

Project Description

This project is based on the VG93 (FDC1793/WD1793) emulator core for FPGA originally developed by IanPo and later refactored by andykarpov for the Karabas-Go project.

For this implementation:

• All Beta Disk–related components were removed, leaving only the VG93 (FDC1793/WD1793) itself.
• Several additional internal signals were routed to the VG pins, which makes the source code slightly different from the original, though not significantly.

Hardware & Firmware Versions

The project provides three PCB versions, each with a corresponding FPGA firmware:

• kpro – Board without buffers, modified v1 with repinned layout for convenience. Must be used only with 3.3v outputs!
• v2 – Second board revision with buffers replacing level shifters. FPGA pinout differs from kpro.
• vDebug – Debug version with several free pins exposed for firmware debugging. Pinout matches v2.

Credits

• IanPo – Original VG93 FPGA core for Firefly FPGA computer
• andykarpov – Refactoring and integration into Karabas-Go
• Community contributors and testers