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Free software ROM for the Sinclair ZX Spectrum
OpenSE BASIC is a replacement ROM for the ZX Spectrum for use with emulators or real machines.
Some of the highlights include a faster and better version of Sinclair BASIC, an enhanced editor, AY support, ULAplus support, improved SCREEN$ handling for UDGs and 8-bit character sets and a faster and more accurate floating-point library.
OpenSE BASIC remains compatible with the majority of Spectrum software and hardware.
It can replace the original ROM in 16K/48K models out of the box. It's also possible to run it in 128K models, but note that it does not include many functionalities present in the original ROMs of those machines, such as the 128K menu, editor and +3DOS.