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AX = 4A10h
BX = 0000h
CX = magic value
0EDCh flush delayed writes
('EDC' = Novell European Development Center)
other (use EBABh to avoid SMARTDRV/DBLSPACE interaction)
Return:
(also refer to notes below)
AX = 6756h ('gV') if installed
CF clear
BX = cache memory type
01h conventional memory
02h extended memory
03h EMS
DI:SI = cache misses
CX:DX = segment:offset address of data area containing statistics
(see #04095)
BP = version in BCD
0100h = 1.00
0101h = 1.01 & 1.02 (!)
Notes: SMARTDRV 4.0+ uses a similar installation check on this function but returns different data. To ensure proper interpretation of the returned values, the caller must check the returned magic value in AX. Since SMARTDRV may also alter DI:SI (and possibly DS), the caller should take care of this, too.. The Novell DOS / DR-DOS 7.x COMMAND.COM invokes this function with CX=0EDCh, which causes NWCACHE to flush any delayed writes before returning the normal register values if it is configured to flush writes before returning to the DOS prompt (/FLUSH:ON); however, if /FLUSH:OFF, this function becomes a NOP with CX=0EDCh.. Note that for this function the 0EDCh special case may vanish with future issues of NWCACHE (2.0+), and the function would then always do the normal install check, and not flush the cache.
See Also: AX=4A10h/BX=0001h"NWCACHE"
Format of NWCACHE statistics: Offset Size Description (Table 04095) 00h DWORD number of read requests 04h DWORD number of reads performed 08h DWORD number of write requests 0Ch DWORD number of writes performed 10h WORD number of disk errors 12h WORD number of cache memory errors
Category: Caches/Spoolers - Int 2Fh - N
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