Re: Poor real time operation in DOS emulation mode

PSRumbagh wrote:
I have a data acquisition program written in Quick Basic V4.5 that I
want to run in the DOS emulation window of Windows XP. The program
outputs 8 bits of data at a continuous rate of 4 KSPS to a DAC for
real time waveform generation. The program works OK in a true, pure
DOS environment where it produces a smooth, continuous waveform.
Under Windows XP the data comes out in spits and spurts, not
continuously. It appears as though Quick Basic V4.5 is getting about
1.25% of the microprocessor's core time and the DAC output is very
choppy. Win XP's Task Manager says there are 63 processes running in
the background. Is this intermittent, choppy operation because of the
multi-tasking nature of Win XP? Is there any way to make this DOS
application work in apparent real time under Win XP? I am using
Tame-Dos to speed up the DOS application and reduce the
microprocessor loading.

No. By definition, XP is a pre-emptive multi-tasking operating system (Win98
was the first). XP will time-slice available CPU cycles between active
tasks, including those that are just waiting, such as checking to see if the
mouse moved in the last few nano-seconds.

You need a dedicated computer running DOS (not XP).

Pay no attention to those who swear a Linux box will do the job.

Fortunately for you, I have a COMPAQ Portable II (286) that I'll be willing
to let go for $200.


.

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