(D)ump Program ROM = write a program memory dump to tst.mem.
(I) ROM input = asynchronous ROM input.
(T)est = invert the test flag.
(R)eset = reset the emulator to the start point.
(ESC) quit = terminate the emulation.
(M) Display RAM = display 256 4-bit RAM characters on a separate display page.
Press any other key to execute the next instruction.