More debug:
07.544: Booting from Floppy...
07.544:
enter handle_13:
07.544: a=00000201 b=00000000
c=00000001 d=00000000 ds=0000 es=07c0 ss=dd80
07.544:
si=00000000 di=00000000 bp=00000000 sp=0000fac8 cs=f000 ip=c9ac
f=0202
07.544: disk_op d=0x000f4510 lba=0 buf=0x00007c00 count=1
cmd=2
07.565: check_recal_drive 0
07.565: floppy_drive_recal 0
07.565:
handle_0e
07.565: handle_0e
07.565: floppy_media_sense 0
ftype=4
07.565: floppy_drive_readid 0 rate=0 head=0
07.930:
handle_0e
07.930: floppy_media_sense finish 0 data_rate=0 fms=17
stype=4
08.123: handle_0e
08.123: Booting from 0000:7c00
08.123: enter
handle_13:
08.123: a=00000201 b=00000700
c=00000002 d=00000100 ds=0000 es=0000 ss=dd80
08.124:
si=00007bd2 di=00000700 bp=00007c00 sp=0000fac8 cs=0000 ip=7d6e
f=0002
08.124: disk_op d=0x000f4510 lba=19 buf=0x00000700 count=1
cmd=2
08.313: handle_0e
08.313: enter
handle_13:
08.313: a=00000201 b=00000700
c=00000010 d=00000100 ds=0000 es=0000 ss=dd80
08.313:
si=00007bd2 di=00000002 bp=00007c00 sp=0000fac8 cs=0000 ip=7d6e
f=0002
08.315: disk_op d=0x000f4510 lba=33 buf=0x00000700 count=1
cmd=2
08.445: handle_0e
08.445: enter
handle_13:
08.445: a=00000201 b=00000900
c=00000011 d=00000100 ds=0000 es=0000 ss=dd80
08.445:
si=00007bd2 di=00000002 bp=00007c00 sp=0000fac8 cs=0000 ip=7d6e
f=0006
08.445: disk_op d=0x000f4510 lba=34 buf=0x00000900 count=1
cmd=2
08.635: handle_0e
08.635: enter
handle_13:
08.635: a=00000201 b=00000b00
c=00000012 d=00000100 ds=0000 es=0000 ss=dd80
08.635:
si=00007bd2 di=00000002 bp=00007c00 sp=0000fac8 cs=0000 ip=7d6e
f=0006
08.638: disk_op d=0x000f4510 lba=35 buf=0x00000b00 count=1
cmd=2
08.823: handle_0e
08.823: enter
handle_13:
08.823: a=00000201 b=00000d00
c=00000101 d=00000000 ds=0000 es=0000 ss=dd80
08.823:
si=00007bd2 di=00000002 bp=00007c00 sp=0000fac8 cs=0000 ip=7d6e
f=0002
08.826: disk_op d=0x000f4510 lba=36 buf=0x00000d00 count=1
cmd=2
09.205: handle_0e
09.205: floppy error: 40 04 10 01 00 01
02
09.205: invalid basic_access:96:
09.206:
a=00000200 b=00000d00 c=00000101 d=00000000 ds=0000 es=0000
ss=dd80
09.206: si=00007bd2 di=00000002 bp=00007c00 sp=0000fac8
cs=0000 ip=7d6e f=0002