ProDOS volumes
128MB capacity split across four ProDOS drives—room for software, data, and backups.
Apple IIc · IIc Plus
Internal storage that feels like it was always there
MegaFlash, designed by Thomas Fok, is an internal storage device for Apple IIc and IIc Plus computers—multiple ProDOS volumes, a fast RAM disk, Wi‑Fi transfers, network time sync, and a full control panel—built around a Raspberry Pi Pico 2 W.
What you get
RAM & ROM disks
400kB RAM disk for speed, plus a ROM disk for disaster recovery when you need a known-good boot path.
Slinky & boot menu
256kB Slinky emulation on stock IIc firmware, and a boot menu in the spirit of ROM4X/5X.
Control panel
Configure and manage the device from a dedicated control panel stored in Pico flash—no cramming everything into Apple ROM.
Time & networking
Real-time clock with a ProDOS driver, NTP sync over Wi‑Fi, and TFTP for moving ProDOS images on the network.
Serial & extras
XModem over USB serial, an FPU for Applesoft BASIC, and fixes for System ROM and Applesoft quirks.
Requirements
Compatible systems
Apple IIc, or Apple IIc Plus. The required system ROM replacement is provided to enable MegaFlash functionality.
Hardware snapshot
Raspberry Pi Pico 2 W, Winbond 25Q01 NOR flash, GAL16V8 for decode, and 5V–3.3V level shifting. Schematics are in the repository.
Documentation
The project README, Pico firmware notes, and API docs live on GitHub. There is also a user guide (PDF) for deeper setup and usage detail.
Open the repository