Tag: 30 pin simm

Single 16 MB, 60 ns, non-parity fast-page-mode SIMM for specifically listed 30-pin Macintosh systems.

The Artmix product page reported out of stock on 2026-07-24. Check the direct page for a restock and confirm the exact computer's ROM, addressing, bank-population, and clearance requirements.

Adds 1 MB of banked RAM to an Atari 1200XL or 800XL with a 30-pin SIMM and custom refresh and bank-selection logic.

The archived article provides the circuit discussion, 1200XL connection table, SIMM pinout, and software notes but describes the 800XL only as having similar connection points. It is an advanced historical wire-and-perfboard build. The author reports that the SpartaDOS cartridge does not function with this configuration and that ordinary SpartaDOS and much commercial software see only a 320XE-style subset; MYDOS 4.5.1M or newer needs the documented page sequence.

Open four-layer 30-pin FPM memory family with 4 MB, parity, 16 MB, and early-Macintosh PAL SIMM variants.

The assembled GW4192A kit was out of stock on 2026-07-24 and had been sold out since October 26, 2022. GW4194A had been sold out since January 19, 2023. Open schematics and layouts remain available. These modules support FPM, not EDO, even when an EDO chip is wired to operate in FPM mode. Check refresh type, parity, capacity, bank population, and physical clearance against the exact computer before building or installing a variant.

Open replacement RAM expansion board for an original or Reloaded Macintosh Classic logic board.

The public repository supplies Gerbers, BOM, and pick-and-place data under a noncommercial Creative Commons license. The Classic BBU limits total memory to 4 MB; larger SIMMs do not raise that limit. Builders must source 256x4 SOJ RAM, SIMM sockets, and the listed parts.

Uses a 1 MB 30-pin SIMM and GAL controller to add switchable Compy Shop or Newell/RAMBO banked memory to Atari XL and XE computers.

The Polish project page publishes a schematic, GAL JEDEC file, utilities, parts list, full 800XL and Freddie-equipped 800XLF instructions, startup tests, and timing troubleshooting. Installation is highly invasive and may require trace cuts, lifted or bent IC pins, motherboard timing changes, and RAS-delay tuning for a particular machine. The page groups the 600XL and 1200XL with older 800XL memory-control hardware but does not provide separate step-by-step guides for those models. No explicit project license was verified.

DIY 4 MB 30-pin Macintosh memory module made by transplanting DRAM from a compatible 16 MB 72-pin SIMM.

The current store listed the bare kit and optional passive-component set without an out-of-stock marker on 2026-07-24. Compatible donor DRAM is not included.