Questions about pure DOS (solved) - China DOS Union Forum

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.

Floor1　llztt	Posted 2010-11-03 22:10
中级用户　Posts 44　Credits 204
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. Attachments error.gif (40.24 KiB)