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-PROM3 - bad but other PC with vendor bios read this floppy OK

gPXE 1.0.1 (PCI) - ok

gPXE 5.4.4 (ISA) - ok

P.S. SeaBIOS make exclamation in WinXP on device manager on Realtek RTL8139 NIC :-(