My conventional memory isn't 640K - China DOS Union Forum

config.sys
-------------------------
device=c:\himem.sys
device=c:\emm386.exe ram i=a000-a7ff i=b000-b7ff note this part
dos=high,umb
-------------------------
Here, ram can be replaced with noems
i=b000-b7ff can be removed
i=a000-a7ff is the key part
Test results

mem

Memory Type Total Used Free
---------------- -------- -------- --------
Conventional 672K 15K 657K
Upper 81K 32K 50K
Reserved 352K 352K 0K
Extended (XMS) 48,047K 323K 47,724K
---------------- -------- -------- --------
Total memory 49,152K 721K 48,431K

Total under 1 MB 753K 46K 707K

Largest executable program size 657K (673,024 bytes)
Largest free upper memory block 48K (49,392 bytes)
MS-DOS is resident in the high memory area.

mem /c /p

Modules using memory below 1 MB:

Name Total Conventional Upper Memory
-------- ---------------- ---------------- ----------------
SYSTEM 35,744 (35K) 10,656 (10K) 25,088 (25K)
HIMEM 1,120 (1K) 1,120 (1K) 0 (0K)
EMM386 3,200 (3K) 3,200 (3K) 0 (0K)
COMMAND 7,424 (7K) 0 (0K) 7,424 (7K)
Free 723,888 (707K) 673,024 (657K) 50,864 (50K)

Memory Summary:

Type of Memory Total Used Free
---------------- ----------- ----------- -----------
Conventional 688,128 15,104 673,024
Upper 83,376 32,512 50,864
Reserved 360,448 360,448 0
Extended (XMS) 49,199,696 330,320 48,869,376
---------------- ----------- ----------- -----------
Total memory 50,331,648 738,384 49,593,264

Total under 1 MB 771,504 47,616 723,888
Largest executable program size 673,008 (657K)
Largest free upper memory block 49,392 (48K)
MS-DOS is resident in the high memory area.
-----------
This method conflicts with some Chinese character support systems (for example UCDOS)
I don't know whether it conflicts with others, hehe

Floor1　fcicq	Posted 2003-07-18 00:00
初级用户　Posts 20　Credits 157
config.sys ------------------------- device=c:\himem.sys device=c:\emm386.exe ram i=a000-a7ff i=b000-b7ff note this part dos=high,umb ------------------------- Here, ram can be replaced with noems i=b000-b7ff can be removed i=a000-a7ff is the key part Test results mem Memory Type Total Used Free ---------------- -------- -------- -------- Conventional 672K 15K 657K Upper 81K 32K 50K Reserved 352K 352K 0K Extended (XMS) 48,047K 323K 47,724K ---------------- -------- -------- -------- Total memory 49,152K 721K 48,431K Total under 1 MB 753K 46K 707K Largest executable program size 657K (673,024 bytes) Largest free upper memory block 48K (49,392 bytes) MS-DOS is resident in the high memory area. mem /c /p Modules using memory below 1 MB: Name Total Conventional Upper Memory -------- ---------------- ---------------- ---------------- SYSTEM 35,744 (35K) 10,656 (10K) 25,088 (25K) HIMEM 1,120 (1K) 1,120 (1K) 0 (0K) EMM386 3,200 (3K) 3,200 (3K) 0 (0K) COMMAND 7,424 (7K) 0 (0K) 7,424 (7K) Free 723,888 (707K) 673,024 (657K) 50,864 (50K) Memory Summary: Type of Memory Total Used Free ---------------- ----------- ----------- ----------- Conventional 688,128 15,104 673,024 Upper 83,376 32,512 50,864 Reserved 360,448 360,448 0 Extended (XMS) 49,199,696 330,320 48,869,376 ---------------- ----------- ----------- ----------- Total memory 50,331,648 738,384 49,593,264 Total under 1 MB 771,504 47,616 723,888 Largest executable program size 673,008 (657K) Largest free upper memory block 49,392 (48K) MS-DOS is resident in the high memory area. ----------- This method conflicts with some Chinese character support systems (for example UCDOS) I don't know whether it conflicts with others, hehe

Floor3　Roy	Posted 2003-07-18 00:00
管理员　Posts 1,633　Credits 4,869
Warning: In theory, it may use upper memory at A000..AFFF (VGA graphics) and B000..B7FF (hercules adapter) But some programs (or BIOS Int 10 functions) sometimes seem to write to this area, so operating with this upper memory area is strongly not recommendedA000-B7FF use it at your own risk

Floor4　Wengier	Posted 2003-07-18 00:00
系统支持　Posts 10,521　Credits 27,736
Yeah... for example, if you use B000-B1FF, Win9x won't boot; if you use any area within B000-B7FF, PDOS95 will crash!

Floor2　Roy	Posted 2003-07-18 00:00
管理员　Posts 1,633　Credits 4,869