Another report of bad times...
Now that the pc seems to be ok i've encountered another matter.
Win98/Xp gets installed without issues, so i would try a clean msdos 6.22 install, in order to create a Msdos 6.22/win98 system, after an hd formatting and partitioning using the win98 cd boot menu ( tried a 60gb partition - 20% - on a 320gb sata hdd connected through Marvell 88SA8052 SATA-PATA ). And here i am with problems again: the first of the 3 dos 6.22 installation disks ( which should be the bootable one ) does not do the job, in fact, when i insert it at the boot, after the summary screen following the post, the pc tells me to remove the disk and than to reboot. Tried several version of msdos 6.22 found around with the same behaviour.
Then, before i started to wonder about a floppy drive issue, i tried too a bootable floppy created within win98: it works, so the floppy drive is not the issue. However, unfortunately i HAVE to use mandatorily the dos 6.22 first disk as bootable one if i want to install msdos.
Now, getting to the point, what's the matter with the dos 6.22's disks? A command.com and io-msdos.sys/hardware incompatibility?