Tag: programmable rom

Provides two switchable 8 MB flash banks that can be programmed over USB without a separate ROM programmer.

Replaces many 24-, 28-, 32-, and 40-pin EPROMs and mask ROMs with a configurable RP2350 board programmed over USB.

OneROM boards do not include ROM contents. Supply legally obtained images, choose the correct 24-, 28-, 32-, or 40-pin hardware, configure the exact ROM type and chip-select behavior, and confirm socket clearance and orientation. The open project provides a fabrication path. On 2026-07-24 JCM listed Fire 24, Fire 28, Fire 32, and Fire 40 as kit or assembled options, but its extracted page still called the 32- and 40-pin versions coming soon and did not establish which options could actually be ordered.

Replaces Apple II system ROMs with in-system programmable banks selected from an on-screen menu.

All four current model pages offered an order path on 2026-07-24. Optional video and MAP ROM functions require the matching socketed ICs and cables; many compact Apple II systems have those chips soldered.

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

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.

Provides a reusable prototyping card with an in-system programmable ROM for Apple II and Apple III hardware projects.

The current storefront exposed kit and assembled selectors on 2026-07-24. It is a development platform, not a finished peripheral; safe use depends on the user's circuit, firmware, power handling, and bus design.