ARCHM XCOMP 8086A 
$7c00 XSTART \ BIOS loads boot bin at $7c00
HERE $200 0 FILL
FJR JRi, TO L1 ( start )
XORG $25 + 'HERE ! ( bypass BPB ) L1 FMARK ( start )
CLI, CLD, AX $800 MOVxI,
DS AX MOVsx, ES AX MOVsx, SS AX MOVsx,
SP $ffff MOVxI, DX PUSHx, ( will be popped by OS ) STI,
AH 2 MOVri, DH 0 MOVri, CH 0 MOVri, CL 2 MOVri, AL 15 MOVri,
BX 0 MOVxI, $13 INT, \ read sectors 2-15 of boot floppy
\ TODO: reading 12 sectors like this probably doesn't work
\ on real vintage PC/AT with floppy. Make this more robust.
$800 0 JMPf,
XORG $1fe + 'HERE ! $55aa M,