Yes, that is what I want to do.
You see I'm using the 80C535 single-board computer. On the eprom is the monitor program with new interrupt vector addresses as well, so I need to right to the RAM, whose code memory is from 4000H.

The layout is as follows:

0000H - 3FFFH is Eprom
4000H - 7FFFH is RAM
8000H - BFFFH is eprom
C000H - FFFFH is RAM, 32K each.

The one interrupt vector redirect address is, FF03H and this is for 0003H, which is external interrupt 0.
Can this be done?

Thanx in advance
KR