Hello everyone :
With SIMCGA( or similar apps) we can run many CGA mode games under hercules mode.
But I found that AlleyCat runs under hercules mode lost something !!!
The clothes do not move and the wiindows never opened 😕
IT works fine unde CGA mode.
Anyone knows why it so strange and how to solve this problem ?
Thanks 😀
Maybe that's the way the program behaves on real Hercules hardware - in which case it isn't really a DOSBox problem. This SIMCGA program doesn't sound like something that would have perfect compatibility with all CGA software.
Alley Cat, like some other CGA games, uses the vsync signal; and sync is a bit different on Hercules compared to CGA. Magic Key and SIMCGA aren't able to do anything about how sync is handled, as it usually involves modifying code.
The differences are:
- Port 3BAh instead of 3DAh
- Bit 7 instead of bit 3
- The meaning of the bit is inverted
I hacked a copy of ALLEYCAT.EXE with the necessary changes, and the animations then work correctly. At any rate, it's not a DOSBox issue; but be forewarned that you may encounter the same sort of thing with other CGA games.
Thanks for your replies. I know the reason now.
Hercules is the 1st machine I touched. So I yearn to review the games and apps on it again.
Thanks again.
