grossman@bbn.com (Martin Grossman) (02/28/91)
1) I just got a 80386DX 33MHZ
A: is 5.25 1.2MB
B: is 3.5 1.4MB
C: is 130MB IDE
BIOS is megatrends (or something like that)
2) I've installed fastback plus and during install it says it can't use
the DMA (even low speed DMA)
3) I've sucsessfuly backed up (just 5 MB) onto B: but using the "DOS"
feature (I assume this means fastback is using DOS calls instead of
direct writes (via DMA) to the drive)
4) In the BIOS extended setup their is an option for DMA speed. The
choices are 4.xx or 7.yy (I don't remember exactly what xx and yy
are).
5) I've tried both DMA speeds and fastback complains either way.
So, can someone explain this?
PS Are there any PD programs out their that I can use to make sure the
DMA chip(s) are physicaly in the system (hard disk doesn't use DMA)
and are working?
PS#2. I got no replies from a post a week ago so here goes again...
Does anyone know why a serial "pc systems cmouse" would work
fine on an XT and not on a very fast 80386 at 33MHZ?cs153020@cs.brown.edu (Joel Scotkin) (03/01/91)
I had a similiar problem with a backup program on a 386 when I was using a disk cache. If you are using one, notably smartdrv from windows, when the program tries backing up it keeps failing compare tests from the data to the cache, and gives up, going slower and slower. For me, pctools backup was completely garbled by smartdrv, even at the slowest setting, but the program knew that just enough was wrong to turn off all dma transfers. Joel Scotkin cs153020@cs.brown.edu
mir@opera.chorus.fr (Adam Mirowski) (03/01/91)
In article <63023@bbn.BBN.COM>, grossman@bbn.com (Martin Grossman) writes:
%% PS#2. I got no replies from a post a week ago so here goes again...
%% Does anyone know why a serial "pc systems cmouse" would work
%% fine on an XT and not on a very fast 80386 at 33MHZ?
Maybe your are not using the same port (for example COM1 on the XT and
COM2 on the 386). Usually there are different Mouse Systems drivers for
each port, or you have to specify /1 or /2 on the command line when
loading the driver.
--
Adam Mirowski, mir@chorus.fr (FRANCE), tel. +33 (1) 30-64-82-00 or 74
Chorus systemes, 6, av.Gustave Eiffel, 78182 Saint-Quentin-en-Yvelines CEDEXbobmon@iuvax.cs.indiana.edu (RAMontante) (03/02/91)
grossman@bbn.com (Martin Grossman) <63023@bbn.BBN.COM> : | 1) I just got a 80386DX 33MHZ | A: is 5.25 1.2MB | B: is 3.5 1.4MB | C: is 130MB IDE | BIOS is megatrends (or something like that) | | 2) I've installed fastback plus and during install it says it can't use | the DMA (even low speed DMA) Try running your machine at slow (viz. 8MHz) speed. (It does have a "turbo" or speed switch, doesn't it?) I had this same problem on my 25MHz 386box, but slowing it down to 8MHz allowed FB to use DMA.