Tag: rom disk

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

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.

Current and buildable replacement ROMs for early compact Macs with a customizable bootable ROM disk and HD20 support.

On 2026-07-24 JCM showed eleven 128K/512K modules and nine Plus modules in stock. Infinity Products also listed standard and spare-ROM kits without an out-of-stock marker. Installation requires opening the Macintosh, removing its ROMs, and soldering three or four address and write lines to the mainboard. BMOW provides the original parts list, Gerbers, assembly instructions, Flash Tool, and ROM data.

Replace a Macintosh ROM SIMM with reprogrammable flash for custom ROMs and, with 2 MB of flash, a bootable ROM disk.

The GGLABS Tindie store was taking a break on 2026-07-27, but EconoSimm remains buildable from published files. EconoSimm requires a roughly 1.2 mm PCB so it fits the ROM socket, four compatible PLCC-32 flash chips, and a standard flash programmer with a PLCC32-to-DIP adapter. Its author says the BMOW SIMM programmer may work but has not tested it. The bootable 1.5 MB ROM disk requires 2 MB of flash and a correctly prepared image.

Moves an SE/30 ROM onto a PDS card, bypassing the aging ROM SIMM socket and adding a bootable 2 MB ROM disk.

The store listed the PDS ROM Card at $39 with selectable flashed-ROM and chipless configurations on 2026-07-27. The vendor does not support chipless purchases because programming and ROM preparation can be difficult. A long-term installation should replace the included test clip with a soldered jumper.