Macintosh Quadra 800 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 800.

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 800 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): The premium 60 ns design explicitly lists the Quadra 800.

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 800 is explicitly named and has a published wiring diagram. Use suitable measurement equipment rather than relying only on the adjustment scale.

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.

Replaces the ball mechanism in an original Apple ADB Mouse or ADB Mouse II with an adjustable optical sensor while retaining the ADB interface.

For this system (exact model): TT Design explicitly tested the optical board on a Macintosh Quadra 800. Use only a supported original ADB Mouse or Mouse II shell and retain its ADB cable.

Both $72.99 variants were out of stock on 2026-07-27: the Mouse II board since May 25 and the original wedge board since July 18. Match the replacement to the exact shell and board shape before ordering. The original ADB cable is required, and installation may require moving its four wires or connector. The USB-C connector changes settings and firmware; it does not turn the mouse into a USB device.