DreamShell 4.0 RC 1

[SWAT]

(22.12.2013 12:26)kof888 писал(а):  hi，swat~

Maybe I understand there is an error, but I found a few games are so, for example kof99, when reading small files are system to read the disk, but when I read large files is another way, I tracked a little game refresh sr has finally achieved read, maybe read the front, but in the case of not refresh sr, did not appear to read the file in memory, just after the last refresh sr files do not appear in memory. The results here to play games with sd time, (such as staget character data, or other) there is no problem in entering the game, was elected after a good character ready to enter the battle, it will black screen, but this time it is the time to read large files.

I need more time to test it.....

I think I found reason.
It turns out to check the status of the command in syscalls, on the interrupt (likely VBL) attached some handler for this. Sometimes it turned out so that the survey command status, occurred in parallel to its execution and in some cases, this has led to ambiguous results. So if disable interrupts (write a some value into the SR register, as you say), it's give increased stability.
I took it's into account in the gd emulation (I'm not disable interrupts of course, I make better, details ommited ), and now I believe that there will be fewer graphical artifacts and more compatibility. But I still have not tested it in practice. Perhaps all is not well, I will not assure ahead of time.
Maybe if you were not told about it, I would not have noticed. Just I get a strange problem today and your information has helped me to quickly find the cause of this. Thank you!