hi rob;
the configuation you mentioned is typical for systems which have a bootloader in ROM/EPROM at 00h and XRAM at 8000h.your code is loaded into RAM which serves the dual purpose of holding CODE as well as XDATA.for this to function RD and PSEN ar ORed and given to RD of RAM.the monitor program basically puts LJMP at default vector locations of 03h,0bh etc and transfers the program control to isrs written at 8003 800b etc.while debugging you have to work with base address of 8000h for all your code.once it is done change it 00 and reassemble,burn PROM.remove monitor program/bootloader and replace with this PROM.but be ware your XRAM mappings remain same.
Pranav