2 layers

Zx spectrum lower memory module
lostretrotapes/zx-spectrum-modern-memory
A work in progress to create a PCB to replace the upper and lower RAM chips in the 48k Spectrum with a modern replacement
3 parts2GPL-3.0
Boards in 1 GitHub repository, designed in KiCad, that use the SN74ACT00NSR by Texas Instruments (-40℃~+85℃ 2 20uA 24mA 24mA 3.7V、4.7V 4 4.5V~5.5V 500mV 74ACT 9.5ns@5V NAND Gate SO-14-208mil Logic Gates ROHS). See how each wires it, with its parts, size, README and files; the SN74ACT00NSR’s symbol, footprint and pinout are on its own page.

lostretrotapes/zx-spectrum-modern-memory
A work in progress to create a PCB to replace the upper and lower RAM chips in the 48k Spectrum with a modern replacement