Macintosh LC 575 upgrades

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

For this system (exact model): Infinity Products says its v2 boards are confirmed on the LC 575; the official compatibility list names the closely related Performa 575.

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.

Vintage LC PDS card that adds 10Base-T Ethernet to supported LC, Performa, Quadra, and Color Classic systems.

For this system (exact model): The seller explicitly lists the Macintosh LC 575.

MacEffects' new-old-stock listing said Sold out on 2026-07-27. Search the used market by the exact Farallon EtherMac LC PDS name and confirm that the card, driver disk or downloadable driver, and computer-specific fit are included.

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 LC 575 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 product pages list the LC 575; the premium page specifically calls out Mystic configurations.

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 LC 575 logic board, including Mystic use, is explicitly named. The maker offers a separate Mystic bracket and adjustment-hole back panel.

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.