Current bochs has a 128kB BIOS, not 64kB

contrib/bochs/bochsrc.txt

 # now supported, but we still recommend to use the BIOS distributed with
 # Bochs. Now the start address can be calculated from image size.
 #=======================================================================
-romimage: file=bochs/bios/BIOS-bochs-latest, address=0xf0000
+romimage: file=bochs/bios/BIOS-bochs-latest, address=0xe0000
 #romimage: file=mybios.bin, address=0xfff80000 # 512k at memory top
 #romimage: file=mybios.bin # calculate start address from image size