it's possible using cd43.iso when make OpenBSD 4.3 ISO?

[my mail]

i have success build OpenBSD 4.3 ISO using floppy43.fs, and after testing, this 
iso work perfectly.

but when i build OpenBSD 4.3 ISO using cd43.iso, my ISO can't boot, i have 
using options -no-emul-boot because this file to large.

it's possibel to using cd43.iso when make OpenBSD 4.3 ISO file?

thx