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Yeah, either it's expecting an interrupt to fire and screw with the return address on the stack or the check has already failed when you get to the start of that code.

Recent build cannot boot any disk images...
Maybe from svn r10258?

Did you check the DIP-Switches ?
The Autoboot-Option for the Floppy should be enabled.

Thank you. Now it can boot disk images.

I've checked many of PC-8801 System Roms.
After PC-8801FH, the additional ROM hadn't not dumped yet.
The additional ROM is so called BIOS setup menu just like PC's BIOS.
Total main ROM must be 128KB (Except Kanji Font / Jisyo ROM)

PC-8801FH
PC-8801MH
PC-8801FA
PC-8801MA
PC-8801FE
PC-8801FE2
PC-8801MA2
PC-8801MC
PC-98DO
PC-98DO+

BIOS Setup menu is intergrated on ROM (32KB)
Main Clock can be changed 4MHz <--> 8MHz via BIOS Menu.

So these machines must be re-dumped!

[PC-8801]: Improved irq related functions, less prone to spurious by now

Still thinking about an even better solution, but it's certainly progress:

Nice

Adding some basic pixel timing and Castle Excellent goes into loading mode, it dies after that though.
Pretty sure that now most timing-sensitive things are shuffled around ...

Added i8255 port B read/write comms, fixes at least Berserker Front Gaiden 3 booting

The joy of not having i8255 ports logged ...





EDIT: Bouken Roman boots too, Bruce Lee is very close (it tries to read i8255 port C in a weird fashion, needs investigation)

Fixed spurious irq happening in The Ancient Art of War







EDIT: Burning Point loves this fix as well: