2 layers104.1 × 96.5 mm

RAMBoard
chregu82/ISA_1MB_RAM_Board
DIY 8 Bit ISA Slot RAM Board with 1 Megabyte SRAM for XT machines
30 parts2MIT
Boards in 1 GitHub repository, designed in KiCad, that use the SN74ACT245N by Texas Instruments (-40℃~+85℃ 1 24mA 24mA 4.5V~5.5V 74ACT 8 Tri-State PDIP-20 Buffers, Drivers, Receivers, Transceivers ROHS). See how each wires it, with its parts, size, README and files; the SN74ACT245N’s symbol, footprint and pinout are on its own page.

chregu82/ISA_1MB_RAM_Board
DIY 8 Bit ISA Slot RAM Board with 1 Megabyte SRAM for XT machines