Macintosh LC 475 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 LC 475.

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 475.

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.

Adapts a modern PicoPSU and external power brick to several Macintosh LC-family computers.

For this system (exact model): The maker explicitly lists the Macintosh LC 475. The same page also names the related Quadra 605, which is not yet a separate catalog target.

JCM's build-a-kit page showed the core unit, power switch, PicoPSU kit, and LC power lead in stock on 2026-07-24. Rabbit Hole Computing's mAcTX-LC partial kit was sold out. Both paths require a suitable ATX supply or PicoPSU and correct host cabling; mAcTX-LC normally reuses the original supply cable and needs an optional switch for remote power control.

Recreates the Macintosh LC 475 and Performa 475 logic board as a buildable replacement PCB.

For this system (exact model): The project explicitly recreates the Performa and LC 475 logic board. A complete build requires all board components, assembly, inspection, and testing.

This is an advanced noncommercial board-build project with no assembled purchase path. The repository warns that fabrication data was generated for JLCPCB and may need changes for other manufacturers.

Converts composite, S-Video, RGB, RGBI, and VGA-family retro signals to simultaneous digital and analog DVI-I output.

For this system (exact model): The recognized-mode list says Macintosh timings were tested on an LC 475 at 512x384 through 1152x870. Use the appropriate Macintosh-to-VGA RGB adapter or cable and confirm the selected resolution and sync work with the destination display.

The European SCART and Japanese JP21 Revision B pages exposed login-or-register-to-buy paths on 2026-07-27. Never connect an EU SCART cable to the JP21 version: the seller says the different pinout can damage the device. The newest dated hardware announcement says units made since June 2025 have a larger OLED and USB-C power, but an older section still says Micro-USB. Human review found no package clarification, so confirm the connector, power requirement, and included USB items with the seller. A DVI-to-HDMI cable and source-system cables are sold separately. Medusa line-doubles when needed but does not change vertical refresh rate, so the destination display must accept the resulting 50 or 60 Hz signal and may blank briefly when the source changes resolution. Install only firmware matching the hardware revision.

Retired family of SD-backed SCSI drive emulators that includes internal 50-pin and direct-attach DB-25 hardware.

For this system (exact model): The official v5.5 compatibility page explicitly lists the Macintosh LC 475. Confirm SCSI ID allocation, device geometry, formatting software, fixed chain termination, and available termination power before installation.

Upstream describes SCSI2SD V5 and V6 as permanently retired. SamplerZone nevertheless exposed an Add to Cart path for a cased v5.5 at $129.95 on 2026-07-27, including configured microSD media and optional HD50 or Centronics-50 adapters. Treat v5.1 as a used-market mechanism upgrade and confirm reseller fulfillment for v5.5. The documentation hub lists v4.8.4 from 2019 as the latest firmware for both versions. V5.5 has fixed termination and must be last on its chain; hosts without DB-25 termination power need USB power.

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 475 is explicitly listed. Confirm the required module count for the desired color depth.

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 the broader early module and premium 60 ns design list the LC 475. The premium module is recommended with Spicy O'Clock, but any overclock still requires cooling and stability testing.

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 475 is explicitly named and has a published wiring diagram. This is a soldered overclock modification; verify frequency, temperature, and stability gradually.

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.