Err, actually, not really. The thing is that to build the split-I/D kernel, one sets the linker to produce an output file which still contains the relocation bits. That is then post-processed by 'sysfix', which does wierd magic (moves the text up to 020000, in terms of address space; and puts the data _below_ the text, in the actual output file). So while the files concerned may have a '407' in their header, they definitely aren't what one normally finds in a linked 407 or 410 file. In particular, data addresses start at 0, and can run up to 0140000 (i.e. up to 56KB), while text addreses start at 020000 and can run up to 0160000. So, _etext/_edata/_end are not, in fact, in the same 64K space. And the total of data (initialized and un-initialized) together with the text can be much larger than 64KB - up to 112KB (modor so. Noel