classics wrote:
Create a new, blank workbook and synchronize the cartridge. Put it in the 5200 (with the USB disconnected) and try to start the system test program in slot 128.
If that works, place the ROM image below in slot #1, then attach, re-sync and put it back in the 5200. Try to start the ROM in slot #1.
Steve
Thank you for your reply,
I tried both steps, I got a black screen when I tired to start the test program. I thought I could try the second step, still I got a black screen.