Tag: flash rom

Replaces the Atari 800 personality module with selectable operating systems, faster floating-point code, and configurable extra memory.

The page reported four boards in stock on 2026-07-27. Functions that use $C000-$CFFF are mutually exclusive, so Omnimon and 128 KB Mosaic memory cannot be enabled together. Axlon cards require RAMROM's onboard RAM to be disabled. The optional DS1210 backup controller and coin cell are user-supplied; the seller page inconsistently calls that cell CR2032 and CR2023, so verify the fitted holder before buying a battery.

Selects between two programmed Atari operating-system ROM banks according to the Reset key state at power-on.

Lotharek's version 2 page exposed a login-or-register-to-buy path on 2026-07-27. It arrives flashed with Atari OS and QMEG 4.04, and a small onboard switch selects the default bank. A socketed OS ROM makes installation simple; otherwise the original ROM must be desoldered and a socket should be fitted. The page markets the device for Atari 8-bit computers but illustrates only an 800XL connection, so broader target relationships remain withheld. Do not use it with Ultimate 1MB.

Rebuilds a Commodore 64 around a preassembled replacement motherboard with automatic chip configuration, static RAM, flash ROM, and dual-SID support.

Individual Computers marked the board available for immediate delivery on 2026-07-27. It is not a complete computer: the key CPU, port, sound, and video chips are not included. The product page still uses some preproduction or older photographs, so physical appearance can differ.

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.

Transforms an original Atari 800 with configurable memory, XL/XE operation, CompactFlash storage, flash firmware, SpartaDOS X, and a real-time clock.

Lotharek exposed a current login-or-register-to-buy path on 2026-07-27 and describes Gold as a final 50-piece production run. Installation is an extensive internal modification: it removes the existing RAM cards and personality/ROM board, replaces the Z101 74LS42 with a ribbon connection, adds motherboard jumpers and auxiliary signal wiring, and optionally modifies the power board for an ATR button and activity LED. The installation procedure therefore makes Incognito an alternative to the 5cfab Atari 800 memory boards and RAMROM personality card, not a documented stackable addition. Retro Lemon warns that self-installation damage is not covered by its warranty.

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.

Builds a compact modular IBM PC/XT-compatible computer with an 8088 or NEC V20, up to 640 KB of base RAM, optional upper memory, and 8-bit ISA expansion.

The GPL-3.0 project provides KiCad files, Gerbers, a bill of materials, BIOS, programmable-logic files, and build instructions. Retro Electronics had six bare ENIG PCBs in stock on 2026-07-27; every component and all assembly are excluded. Weird Electronics' board and complete-kit listings were temporarily unavailable while the seller takes a break through August 20, 2026. A separate assembled-board listing had been sold out since May 11, 2026. Weird Electronics sells a Version 1.4 PCB with larger Flash-ROM support, while the repository README documents layouts through Version 1.3; follow the documentation for the board actually supplied.

Current flashable C64 freezer and development cartridge compatible with Retro Replay, Action Replay, and Nordic Power ROMs.

individual Computers marked Nordic Replay available for immediate delivery on 2026-07-30 as a fully assembled and boxed cartridge with the Retro Replay ROM pre-flashed. iComp supports the hardware but not the third-party ROM software. Action Replay compatibility does not supply an Action Replay ROM license; the maker says an owner may use an image from an original cartridge. The accessory connector is documented only for compatible devices such as Silversurfer, RR-Net, and MP3@64, and the technical page warns that incorrectly fitted hardware can short and destroy both devices.

Replaces a socketed 6502 with a W65816 running at up to 10 MHz, backed by fast RAM and programmable flash ROM.

The project publishes Eagle board and schematic files, VHDL and CPLD binaries, test software, and GPLv2-licensed documentation, but no current assembled seller was verified. Revision 1.2b is marked 'ok'; older revisions are prototypes. Building it depends on older Xilinx ISE-era tooling or a compatible programming path, two programmed flash devices, and a socketed host CPU. The author's 10 MHz timing uses 55 ns SRAM outside its rated access time; his burn-in test passed, but builders should not treat that result as a component guarantee.

Adds four switchable 32K banks of Flash ROM to an RC2014 system.

The project page provides firmware, a schematic, PCB files, Gerbers, and supplier links. CP/M use requires the separate SC150 Paged RAM Module. Leave the Flash write-protect jumper in its normal read-only position unless deliberately programming the ROM.

Combines 128K of Flash ROM and 128K of paged RAM for RC2014 systems, including CP/M configurations.

The project page provides firmware, a schematic, PCB files, Gerbers, and supplier links. A later SC707 design also exists, but SC152 remains documented and buildable. Keep the Flash write-protect jumper in its normal read-only position except when programming it.

Adds 128K of Flash ROM and 128K of paged RAM for a CP/M-capable Z80 system.

The project provides Small Computer Monitor S8 firmware, a schematic, Gerbers, PCB design files, and kit or bare-PCB suppliers; an assembled version is not offered. Observe the Flash write-protect jumper and avoid function conflicts with other system memory modules.

Combines a Z80, paged RAM and Flash, clock, reset, and serial terminal on one RCBus module.

The project provides firmware, a schematic, Gerbers, PCB design files, and kit or bare-PCB suppliers; an assembled version is not offered. SC708 has no automatic power-on reset, so press its reset button after applying power. Avoid duplicate CPU, memory, clock, reset, or serial functions when adding it to a modular system.

Adds 512K of Flash ROM and 512K of banked RAM for RomWBW and CP/M.

The project supplies RomWBW and Small Computer Monitor firmware, a schematic, Gerbers, PCB design files, and links for kits and bare PCBs; an assembled version is not offered. It is intended for the SC706 Z80 CPU module and is not compatible with the SC730 CPU plus MMU module. JP1 controls Flash write protection.

Adds 512K of RAM and selectable 512K Flash ROM to a 20-bit-address RCBus system.

The project provides Z80 and Z180 firmware, a schematic, Gerbers, PCB design files, and kit or bare-PCB suppliers; an assembled version is not offered. Observe the Flash write-protect jumper and select the ROM/RAM arrangement required by the processor and firmware.

Combines a Z80 CPU, 512 KiB Flash, 512 KiB SRAM, clock, reset, and RomWBW paging on one modular card.

Tindie listed the complete Z80-512K kit without an out-of-stock notice on 2026-07-25; complete open files also remain available for both designs. The Z80-CPM store page failed extraction, so no stock claim is made for that variant. Z80-512K builders using its supervisor without a backup battery must short the battery connector as documented.

Adds cartridge-based CompactFlash or SD storage, SpartaDOS X, a real-time clock, and loader functions to Atari 8-bit systems.

Lotharek marks both generations discontinued. SIDE2 needs at least 128 KB for its FDISK workflow, and full ATR loading requires Ultimate 1MB. Some systems need a faster 74F08 or buffered O2 timing path. Lotharek ended SIDE3 sales because it could not supply firmware that worked reliably across all computers; Revision 3.2 uses a Gowin FPGA, needs its matching firmware and programming path, and does not accept the older CPLD updates. Identify the exact hardware and firmware revision before buying or flashing a used cartridge.

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.

Business-card-sized RC2014-compatible Z80 computer with 1 MiB of memory and integrated serial and parallel I/O.

This is a surface-mount self-assembly project with KiCad, Gerber, CPLD, and firmware documentation. Programming its MAX7000AE CPLD requires the older Quartus II 13.0sp1 toolchain because newer Quartus versions do not support the device.