Changes
/* System Cartridge Bug */
* Replace opcode LD C,07h (at 05EBh in system cart) by LD C,83h (this fixes the bug)
* Replace opcode LD HL,C072h (at 05E8h in system cart) by LD HL,0000h (completely disables the bootmenu, which was a rather annoying idea anyways)
* Or, remove or disable the ROM in the disc-interface, and cut the ROMDIS signal in the disc-interface (so the built-in AMSODS AMSDOS in the CPC+ is usedinstead of the external DOS; this can be done without EPROM burner, but doesn't support 80-track drives)
