Macintosh IIx upgrades

Runs a 68030 CPU and optional 68882 FPU at 47 MHz in SE/30 and socketed modular Macintosh configurations.

For this system (exact model): The current Booster 2.0 title explicitly includes the Macintosh IIx, and the 1.x maker page specifies its socketed PGA branch for the IIx. Use a CPU-socket variant rather than the SE/30 PDS card.

Juicy Crumb showed a $309 to $359 Add to cart path for Booster 2.0 on 2026-07-27. Choose the exact PDS or PGA-socket variant for the host. Booster 1.x is superseded but its original-card schematic and GAL archive remain available. PDS-card compatibility differs between generations, and System 7.5 or later can produce sound glitches on 1.x cards.

Open four-layer 30-pin FPM memory family with 4 MB, parity, 16 MB, and early-Macintosh PAL SIMM variants.

For this system (exact model): Use the GW4194A PAL SIMM variant, installed as a matched set of four for 16 MB. Access to the full capacity requires MODE32 or a compatible 32-bit-clean ROM.

The assembled GW4192A kit was out of stock on 2026-07-24 and had been sold out since October 26, 2022. GW4194A had been sold out since January 19, 2023. Open schematics and layouts remain available. These modules support FPM, not EDO, even when an EDO chip is wired to operate in FPM mode. Check refresh type, parity, capacity, bank population, and physical clearance against the exact computer before building or installing a variant.

Open 64-pin ROM SIMM with selectable 32-bit-clean System 6 and System 7.1 ROM disks for six 68030 Macintosh models.

For this system (exact model): The IIx is explicitly supported and can use every supplied image, including the unmodified IIx ROM.

The assembled Tindie module was out of stock on 2026-07-24 and had been sold out since May 7, 2025. Hardware, software, and fabrication files remain public. Most tested 68030 accelerators work, but some 68040 accelerators do not; select the stock IIsi or IIx ROM when the custom image is incompatible. Only 8 MB of the 16 MB flash can be selected at once, with the computer powered off before changing the switch.

Provides a programmable 2 MB Macintosh ROM SIMM using four socketed PLCC32 flash chips.

For this system (exact model): The IIx is explicitly named. Some supported computers may require a ROM SIMM socket to be installed first.

The current page offered populated and chipless versions in multiple PCB colors on 2026-07-24. Its dated notice says the red PCB alone was out of stock on 2026-04-26, with black and purple also listed.