Macintosh Quadra 650 upgrades

Open hardware SCSI emulator with SD-backed storage, optional Wi-Fi networking, and host-side management tools.

For this system (exact model): The official compatibility list names the Macintosh Quadra 650.

Current seller checks on 2026-07-27 found a $39 internal 50-pin Pico 2 W kit, a $49 assembled external DB-25 model, a $49 PowerBook model, and a $59 assembled Ultra Narrow 50-pin model at authorized seller ToTs RETRO. JCM also carried assembled Ultra hardware and model-specific Macintosh adapters. Prices, stock, included media, and support differ by seller. Ultra models require Berg or Molex power and cannot run from SCSI termination power. The initial Ultra hardware release is not yet open hardware, although its firmware remains GPL; the project says hardware licensing will open later.

Two-chip 256 KB 68-pin VRAM SIMM for 68K Macintosh models that cannot use, or do not need, a 512 KB module.

For this system (exact model): The Macintosh Quadra 650 is explicitly listed.

The current storefront listed individual 256 KB modules without an out-of-stock marker on 2026-07-24. Chip speed can vary from 60 ns through 80 ns by production lot.

512 KB 68-pin Macintosh VRAM module sold in a premium 60 ns design and a limited early four-chip design.

For this system (exact model): Both variants explicitly list the Quadra 650, also sold as the Centris 650.

The premium 60 ns module and the final red clearance modules were listed on 2026-07-24. The purple early-production modules were sold out with no planned rerun. Modules are sold individually; systems with two sockets require two purchases.

Provides finely adjustable clock generation for selected 68040 Macintosh logic boards using an XC88916-family clock driver.

For this system (exact model): The Quadra and Centris 650 are explicitly named and have a published wiring diagram. Overclocking can make the computer unstable or damage components.

The current product page listed the module without an out-of-stock marker on 2026-07-24. Installation, measurement, cooling, stability testing, and any resulting hardware damage remain the user's responsibility.