[comp.sys.ibm.pc.misc] QEMM and PC-CACHE with memory board

Murray_Thessman@f170.n771.z3.fidonet.org (Murray Thessman) (04/19/91)

In a message of <Apr 16 15:24>, "Curiosier and Curiosier..." (3:771/170) 
writes: 
 >"aC:  From: simon@hpspwr.enet.dec.com ("Curiosier and Curiosier...")
 >"aC:  Organization: Digital Equipment Corporation

 >"aC:  --
 >"aC:  My 386SX PC has 4 MB RAM -- maximum that can be installed on the 
 >"aC:  motherboard.  I added a 2 MB memory board (on the bus) ...
 >"aC:  extended...  and let QEMM 5.12 handle all the memory. 
 >"aC   The idea is to use additional memory as a disk cache.

I had this problem too (4MB + 2MB). DV was dog slow as it seemed to use some 
of the above memory for itself and took 4 -6 seconds for disk access at 
times!
Telling qemm to leave the top 2 MB did not work either. On trying to use 
this remaining 2MB for a cache Qemm allocated 'Xtended memory' from its 
Xpanded pool leaving the 2MB up top.  

As I really wanted 1.4MB ramdisk and .6MB Cache I loaded Smartdrv above Qemm,
this only had the effect of scrambling the fat table!

I have settled for a 2Meg reamdisk using Ramdrive.sys before Qemm.

 <config.sys>
 device=c:\sys\Ramdrive.sys 2048 512 1024 /e
 DEVICE=C:\QEMM\QEMM386.SYS RAM I=F000-F7FF X=C700-DFFF DISKBUF=16 NW3
 shell =c:\dos\command.com/p /e:512
 device=c:\qemm\loadhi.sys /r:1 c:\OPUS\Gateway1.sys
 DEVICE=C:\QEMM\LOADHI.SYS /R:1 C:\OPUS\x00.sys T=2048 E FIFO=15
 FILES=50
 BUFFERS=5
 LASTDRIVE=Z
 FCBS=16,8

There are probably a few more bits that can be tidied up given time.

regards Murray



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