Tag: ram replacement

Replaces the Z80 and upper 32 KB of DRAM in a ZX Spectrum 48K, Spectrum+, or Timex TC 2048 while adding AY sound.

The seller exposed a login-or-register-to-buy path for MAMLAS on 2026-07-27; its Z80SRAM predecessor is discontinued. MAMLAS installation is invasive: remove the original CPU and any socket, disable or remove the upper 32 KB DRAM, and solder the module directly at the CPU footprint with correct pin-1 orientation. The audio connector is not included, and a ZX Spectrum 48K heat sink may need to be bent for clearance. Do not install the module on top of its shipping or protective bottom socket. Used Z80SRAM boards should be treated as a distinct earlier revision and checked against their archived instructions.

Replaces all eight kilobytes of hot-running 6550 system RAM in an original PET 2001-8 with one open modern board.

The assembled Tindie board has been out of stock since 2025-08-04, but source, documentation, and design files remain linked from the product page. This is specifically for 6550-based PET 2001-8 system RAM and should not be treated as a generic replacement for later PET memory organizations.

Open PET repair board replacing 32 KB of system RAM and selectable ROMs while adding built-in diagnostics.

The assembled Tindie board has been out of stock since 2025-08-04, but GPL-2.0 design files remain public. The maker pages repeatedly label the $0000-$7FFF replacement as 32MB; that address range is 32 KB, and independent technical coverage also identifies 32 KB, so this catalog records the functional capacity rather than the apparent unit typo.

Replaces or diagnoses PET system ROM and RAM, expands 8 KB or 16 KB machines to 32 KB, and offers selectable BASIC and display ROM sets.

The current Tindie page instructs international buyers to contact Tynemouth with their address and requested options. A separate TFW8B listing was out of stock. Confirm the five- or nine-switch version, keyboard and display ROM set, shipping, and current fulfillment before ordering. The board does not replace video RAM or character ROM.