Tag: sdram

Provides selectable Apple Slinky or RAMFactor-compatible memory using modern low-power SDRAM.

The assembled Tindie card was out of stock on 2026-07-24 and had been sold out since January 23, 2025. Schematics, board files, CPLD firmware, utility software, and fabrication files remain available under the project's dual-license terms.

Adds low-profile, adjustable RAMWorks-compatible auxiliary memory to an Apple IIe.

The assembled Tindie card was out of stock on 2026-07-24 and had been sold out since December 1, 2025. The open repository remains buildable. A Revision A IIe needs the card's DHGR jumper resistor or trace removed and then loses double-high-resolution graphics support. An A2Heaven VGA Scaler's long 14 MHz clock lead can cause RAM errors unless its clock connection is buffered or otherwise corrected as documented.

Adds selectable 4 MB or 8 MB of low-profile SDRAM fast memory to an Apple IIgs.

The assembled Tindie card was out of stock on 2026-07-24 and had been sold out since June 17, 2025. The repository retains hardware, programmable-logic, documentation, and fabrication sources. Select 4 MB when every byte must be DMA-accessible; at 8 MB, only the first 4 MB is DMA-compatible.

Replaces the Atari 8-bit CPU with a 20 MHz WDC 65C816 accelerator backed by fast SRAM, SDRAM, flash, and software-selectable modes.

Both Lotharek hardware packages are discontinued. The 800XL package includes two Adaptus boards and requires CPU and OS ROM removal, socket work, a correctly oriented ribbon cable, and EXTSEL, MPD, and ground connections that differ between Freddie and non-Freddie boards. Its page says replacing DRAM with the separate SRAM module is mandatory and records additional O2 timing workarounds for Ultimate 1MB. The XE package may need four or five precision sockets to clear the cartridge slot. The official Rapidus PDF remains unavailable to automated extraction under WF-001, so obtain complete documentation before installing a used board.

PDS memory accelerator that replaces Macintosh SE/30 SIMMs with 256 MB of SDRAM and provides an unbuffered PDS pass-through.

The Tindie page reported four assembled cards in stock at $297 on 2026-07-27. Its United States shipping section simultaneously showed a free rate and said the item did not ship there, so confirm destination availability at checkout. The current Rev B manual covers firmware v0.8.0. It warns against using the older v0.5.4 extension with address translation, documents a ROM-shadowing bypass for timing-sensitive accelerator functions, and says Apple Personal Diagnostics memory tests can hang or corrupt memory near completion. A cache-slot accelerator must never be inserted directly into the SE/30 PDS or the Synchr pass-through; use the correct SE/30 adapter. Three-card stacks discussed by the community remained untested.