Fast emulator and development system for the processors 6502, 65C02 and 65SC02. The processors can be emulated within a GEM window. The EMU 65x02 is perfectly suited for programming the 65x02. A program can be developed, assembled and generated as finished code e.g. for an EPROM of a single chip card. But before you burn an EPROM, you better try out the program. No problem for the 65x02 emulator. The assembled program runs on the ST/TT in a virtual screen (25*80 GEM window). A debugger makes it possible to trace the program, to stop it at a certain address or at a breakpoint, to trigger single stepping and IRQs, or NMIs. There the state of the CPU can be displayed and changed. A help system gives information about assembler directives and operating system functions, which are available to the assembler in the ST (screen clear, read/set cursor position, keyboard query, character output, register display, string output, ...). 65x02 runs as GEM program or as an accessory.