Hans:
Maybe now is an excellent time for your to blow away the rest of your old tool and move up to ISP devices with onboard FLASH. If you looked at the Cygnal parts you can find devices with up to 128K bytes of flash. These chips have a JTAG port that will let you program the FLASH right from the IDE environment on your PC and there is also onboard hardware breakpoint capability so you no longer need an emulator or ROM sim box to debug code. I can bet if you undertook to do development on one of these processors you would wonder why you didn't turn your attention this way before now.

There are a number of articles on my 8052.com home page that highlite some or the capabilities and usage of Cygnal parts in a development environment.

Michael Karas