Description
Nov 5, 2025: The PETdisk MAX v3 is here!
This is the latest version of the PETdisk MAX, a storage device for the Commodore PET. It has the same features as the v2, but now uses an ESP32-S2 instead of an ESP32.
It’s ready! The PETdisk MAX, the successor to the original PETdisk I made several years ago, is a storage device for the Commodore PET which uses microSD cards as well as accessing PET software over the internet.
You can use FAT32 formatted microSD cards to hold as much PET software as you like. It supports both directly loading .PRG and .SEQ files from the filesystem of the card, and also supports mounting .D64 disk images.
In addition to this you can access PET software hosted on standard web servers as if it was a locally attached drive.
The PETdisk MAX is powered internally from one of the PET’s ROM sockets, so there is no cable hanging out the back of the machine. The device is very low profile and doesn’t extend far out the back of the PET, so you can just leave it attached without worrying about it crashing into something. It also has a passthrough edge connector so you can continue to use other IEEE-488 devices such as printers and other disk drives while the MAX is attached.
The PETdisk MAX comes as a kit, which requires only simple through-hole soldering. All surface mount parts are pre-assembled. Assembly takes approximately 15 minutes. Requires a soldering iron, solder, and wire clippers.
NOTE: The PETdisk MAX works on PETs with BASIC 2 ROMS and above. The BASIC 1 ROMs had an incomplete implementation the of IEEE-488 protocol. You can use the Romulator 6502 on a BASIC 1 PET to switch out the ROM set to use the PETdisk MAX.
