China DOS Union

I used MS-DOS 7.1 to make a dual boot with XP, but when entering the DOS system, using MEM to check my conventional memory only has 634k, you know originally it was 640k, is there a virus or something? I used the MS-DOS 7.1 boot disk to boot, it is 640K. Who can answer?

Why is there no one responding?

Can you put the screen display after using the MEM/C/P command here for us to see?

How to intercept under DOS

It can be intercepted using software like Screen Thief and so on. But for the text screen, you can redirect the entire screen display to the file TEMP.DAT by using MEM /C>TEMP.DAT, then paste the content in the TEMP.DAT file into the forum.

I set up boot menu 1, with CD-ROM 2, no CD-ROM 3, and the settings for running games.

But when I select the first item:
Memory Type Total Used Free
---------------- -------- -------- --------
Conventional 634K 88K 546K
Upper 0K 0K 0K
Reserved 0K 0K 0K
Extended (XMS)* 228,272K 720K 227,552K
---------------- -------- -------- --------
Total memory 228,906K 808K 228,098K

Total under 1 MB 634K 88K 546K

Total Expanded (EMS) 32M (33,947,648 bytes)
Free Expanded (EMS)* 32M (33,554,432 bytes)

* EMM386 is using XMS memory to simulate EMS memory as needed.
Free EMS memory may change as free XMS memory changes.

Largest executable program size 546K (559,072 bytes)
Largest free upper memory block 0K (0 bytes)
MS-DOS is resident in the high memory area.

When selecting the second item:
Memory Type Total Used Free
---------------- -------- -------- --------
Conventional 634K 33K 601K
Upper 0K 0K 0K
Reserved 0K 0K 0K
Extended (XMS) 228,272K 64K 228,208K
---------------- -------- -------- --------
Total memory 228,906K 97K 228,809K

Total under 1 MB 634K 33K 601K

Largest executable program size 600K (614,688 bytes)
Largest free upper memory block 0K (0 bytes)
MS-DOS is resident in the high memory area.

When selecting the third item:
Memory Type Total Used Free
---------------- -------- -------- --------
Conventional 634K 18K 616K
Upper 57K 15K 42K
Reserved 0K 0K 0K
Extended (XMS)* 228,215K 727K 227,488K
---------------- -------- -------- --------
Total memory 228,906K 760K 228,146K

Total under 1 MB 691K 33K 658K

Total Expanded (EMS) 32M (33,947,648 bytes)
Free Expanded (EMS)* 32M (33,554,432 bytes)

* EMM386 is using XMS memory to simulate EMS memory as needed.
Free EMS memory may change as free XMS memory changes.

Largest executable program size 616K (630,416 bytes)
Largest free upper memory block 42K (43,200 bytes)
MS-DOS is resident in the high memory area.

Try adding DEVICE=EMM386.EXE NOEMS in CONFIG.SYS.