Still something wrong. I try boot from BOOT-PROM disk 3 and:
 
- first run PC - boot OK
- reset PC - boot hangs
- other reset - boot hangs but in other moment
- other reset - boot hangs
 
Booting from Floppy...
Floppy_drive_recal 0
Floppy_enable_controller
Floppy_media_sense on drive 0 found rate 0
Booting from 0000:7c00
Floppy_disable_controller
Floppy_enable_controller
Floppy_drive_recal 0
Floppy_media_sense on drive 0 found rate 0
i8042_command cmd=ae
i8042_wait_write
i8042_command cmd=ae
i8042_wait_write
floppy error: 40 04 00 1c 00 05 02
invalid basic_access:96:
   a=00000200  b=00000000  c=00001c05  d=00000000 ds=5000 es=6080 ss=df80
  si=00000000 di=00005750 bp=0000001e sp=0000f9c0 cs=5000 ip=0188  f=0246
 
but this is only from this disk. Other read OK.
 
BOOT-PROM1 - ok
BOOT-PROM2 - ok
BOOT-PROM3 - bad but other PC with vendor bios read this floppy OK
gPXE 1.0.1 (PCI) - ok
gPXE 5.4.4 (ISA) - ok
RIS (RGFG) - ok
PLOP 5.0.11 - ok
netboot.me - ok
 
P.S. SeaBIOS make exclamation in WinXP on device manager on Realtek RTL8139 NIC :-(