Thanks for fast response, sorry for my english, i'm italian,
1)i have desoldered the NEC765BC and i have soldered a socket for this chip and another chip, but i have the same problem. If i remove this chip the duble error 603 at the post screen is not showed and the computer try to boot from hdd, but hdd on this board not boot properly, This computer working perfect last week, then after my error on floppy it's stopped to boot from hdd and 603 error, my damage on floppy controller intact the hdd boot process?
2) The ISA IDE/FLOPPY card i have installed ok, i have removed it now.
3) I don't understand, you recommend the card XT-IDE? Or a Bios Pathed for this support? I' have a startup disk of this machine, i have to change any settings in it? Yes the card is the same of your, and i have another 2 ISA audio card, one soundblaster 16 with IDE, and one AdvanceLogic with IDE.
Thanks