Tag: 64kb

Raises an Atari 600XL from 16 KB to 64 KB with a compact external parallel-bus module.

The page reported four modules in stock on 2026-07-27. The 600XL supplies the required 5 V through its parallel bus, so this exact module needs no external power supply.

Adds an 8 MHz-or-faster Z80, 64 KB of onboard memory, and a beta CP/M environment through a 1090XL expansion slot.

The page reported one card in stock on 2026-07-27. CP/M customization and utilities remain late beta. The card is sold with or without a Z80; a user-supplied CPU must be rated for at least 8 MHz. The pictured 80-column RPP card is optional and not included. Double-density disk use also requires supporting drive hardware. The exact page names only the 1090XL, so confirm 1091XL compatibility before using it in that implementation.

Socketed daughterboard that expands the C128 or plastic C128D from 16 KB to 64 KB of VDC video memory.

The maker's store exposed an active order path and reported stock on 2026-07-30. Installation requires removing the original metal heatsink and carefully extracting and reinstalling the MOS 8563 with the correct orientation. The maker recommends a modern low-profile heatsink because the daughterboard raises the chip. Reaching the VDC in some C128D systems may require removing the power supply, floppy drive, and drive controller.

Expands a 16 KB Atari 600XL to 64 KB with two 41464 DRAMs and three wiring changes.

The archived instructions call for two 41464-10 or compatible DRAMs, hookup wire, soldering tools, and optional sockets. Chips may need desoldering, several pins and resistor leads must be isolated, and fine motherboard traces are exposed; the author explicitly says to attempt it only if the diagram is understood and at the builder's risk. This is a historical modification guide, not a current kit.

No-solder SRAM daughterboard that expands a Commodore 16 or 116 to 64 KB and can switch back to 16 KB.

Poly.play listed the board as out of stock on 2026-07-30. The earlier direct AmiBay sales thread is closed. Use PCB revision 1.4 or later: the maker reported an error in revision 1.2, refunded those boards, and said revision 1.4 was corrected and tested with Diag264. A reset is required after changing the 16 KB / 64 KB selection.

Compact, low-power C128 VDC video-memory expansion built around one 64 KB static RAM chip.

Poly.play listed the pxlmod board as out of stock on 2026-07-30. An older Protovision order link now reports that the product is not found, so check Poly.play for a restock. Current wording names the Commodore 128(D) without separating plastic C128D from metal C128DCR; the latter normally already has 64 KB of VDC memory.

Adds an all-RAM 64 KB memory map to the SuperPET's 6809 side so it can run the preserved Super OS/9 port.

RETRO Innovations says kits are available through its online store. This is a specialist assembly kit for a two- or three-board SuperPET, not a general PET memory expansion. Use the published construction steps and preserved software package; TPUG and the former OS/9 rights holder do not provide support.

Replaces the C16's original DRAM and multiplexers with a socketed SRAM module that can select 16 KB or 64 KB operation.

The maker's 2024 article still links a SellMyRetro offer and says kits are available, but current stock was not independently established on 2026-07-29. This is explicitly an expert installation: four ICs must be removed without damage, four sockets fitted, and A14, A15, and phi-0 signals connected. The maker warns that it is not a beginner project.