The IBM PS/1 model 2011 has 4 EPROM chips in the motherboard (1 Megabit each) that contains the sytem BIOS, the VGA BIOS and a ROMDISK with PC-DOS 4.0 boot files. The system BIOS and the VGA bios are mapped in E000-FFFF but the other 128 KB seems to be mapped at the end of the 16 Mb addressable space. How can I dump that 128 kb? With debug I can only access to the first megabyte...