想在CONFIG菜单里集成纯净DOS选项，即不加载任何驱动的DOS模式，但发现如果不加载XMS驱动文件，会报错，意思是警告HMA不可用等等，下面有截图可参考。。
测试过很多高人的IMG，包括DOS7.1 MAXDOS VEDE改版的MAXDOS，都有此问题，虽然一闪而过，但确实出现那错误了。。
尤其测试DOS7.1时，把CONFIG.SYS最简单化，但DOS启动时还是会偷偷找MSDOS.SYS然后IFSHLP.SYS然后HIMEM.SYS来自动加载之，没有也报错。。
那个错误提示是在IO.SYS文件里。。
难道纯DOS就是这样启动的吗？？
Warning: the high memory area (HMA) is not available.
Additional low memory (below 640K) will be used instead.
I want to integrate a pure DOS option in the CONFIG menu, that is, the DOS mode without loading any drivers. But I found that if I don't load the XMS driver file, there will be an error, meaning that it warns that the HMA is unavailable and so on. There are screenshots for reference below.
I have tested many experts' IMGs, including the MAXDOS modified version of DOS7.1 MAXDOS VEDE, and there is this problem. Although it flashes by, that error does occur.
Especially when testing DOS7.1, I simplified CONFIG.SYS as much as possible, but when DOS starts, it will secretly look for MSDOS.SYS, then IFSHLP.SYS, then HIMEM.SYS to load them automatically. If there are none, it will report an error.
That error message is in the IO.SYS file..
Is that how pure DOS starts?
Warning: the high memory area (HMA) is not available.
Additional low memory (below 640K) will be used instead.
