Running ZX81 BASIC programs that use the SP ROM Extended commands can be achieved via the ZEsarUX Emulator for OS X, Linux and Windows ZEsarUX Emulator is available here. Install from the .dmg file (OS X) Copy the SP ROM .ROM file sp-rom.rom (see Xcode Project in Disassembly post below) to /Path/To/ZEsarUX-3.0/zesarux.app/Contents/Resources/alternaterom_sp_rom.rom Edit ZEsarUX Emulator config […]