Tag: 4164

Tested 64K-by-1 4164 DRAM chips for repairing Commodore 64 motherboards that use the eight-chip, 16-pin memory layout.

Both exact product routes were present on 2026-07-30, but Tavily did not expose an unambiguous current cart or stock control on the ToTs RETRO page, and Retroleum was temporarily closed until approximately the beginning of August 2026. Confirm stock before ordering. Match the installed memory organization and motherboard rather than relying on case style: Retroleum explicitly excludes Assy 250466 and C64C boards that use two 41464 or 4464 devices.

USB-C-powered bench tester for several families of one-bit vintage dynamic RAM.

Tindie listed seven units at USD 28 on 2026-07-30. Its extracted United States shipping panel was contradictory, showing no rate alongside other shipping text, so confirm destination eligibility and total cost before ordering. The tester requires 5 VDC through USB-C. The manual warns that selecting the wrong RAM can apply destructive voltages; identify the part and verify its datasheet and pinout before starting a test.

Open ATmega328P bench tester that automatically identifies and checks a broad range of vintage DRAM and 2114 SRAM.

The repository was active on 2026-07-20 and documents firmware 5.0.7. It links ready-made routes at AmiBay, Lectronz, eBay, and Tindie plus a PCBWay through-hole board, but those sellers were not independently checked for stock in this pass. Hardware is CERN-OHL-S v2 and firmware is GPLv3. Builders may use through-hole or surface-mount files and must select or build any required adapter for the exact package.

Documents period DIY memory conversions that give an Atari 400 48 KB plus a banked 16 KB or an Atari 800 a 288 KB SuperRam configuration.

These are historical, invasive board-level modifications rather than current kits. Both require extensive disassembly, trace cuts, soldering, stacked or perfboard logic, and staged electrical testing. The authors release the instructions for public use with attribution. The Atari 800 text lists six 41256 DRAMs, while human review found only one 41256 in its rough circuit sketch. The contradiction remains unresolved: do not treat the Atari 800 parts list or sketch as an authoritative build package without reconstructing and checking the circuit.