Re: [CAD_CAM_EDM_DRO] Par Port Speed

That 11 inches per minute would depend, of course, on how many pulses per
inch are required. On a dos box running a 500mhz, you can get about 80000
pulses/second or so depending on the program. if you need 1000 pulses per
inch, i.e. .001 resolution, you would get 80inches per second or 480 inches
per minute.

Art

----- Original Message -----
From: "Rick Dulas" <drspiff@...>
To: <CAD_CAM_EDM_DRO@egroups.com>
Sent: Tuesday, October 03, 2000 12:45 PM
Subject: [CAD_CAM_EDM_DRO] Par Port Speed


> Howdy! I was thinking about Parallel Port speed and seem to recall
> hearing some wise and august person say the speed depends mostly on the
> bus, not on the CPU. I have been playing with BASIC and the following
> code will give you a rough idea of your upper speed limit. On a 486/33
> DOS box, that turns out to be ~11 ipm. YMMWV (your mileage WILL vary).
>
> Rick Dulas
>
> CLS
> INPUT "Number of Micro Steps/Full Step: ", Micro%
> IF Micro% = 0 THEN
> Micro% = 1
> END IF
> IPM:
> INPUT "Number of Steps/Inch of travel:[no commas] ", StepsInch%
> SELECT CASE StepsInch%
> CASE IS <= 0
> PRINT "Please put in the positive, whole number of steps to move
> the machine 1 inch."
> GOSUB IPM
> CASE 1 TO 10000
> StepsInch% = StepsInch%
> CASE IS > 10000
> PRINT "Check your decimal place."
> GOSUB IPM
> END SELECT
> INPUT "Number of Iterations: "; k%
> InchFactor% = StepsInch% * Micro%
> AvgCPS& = 0
> FOR i = 1 TO k%
> StartTime = TIMER
> n = 0
> WHILE (TIMER - StartTime) <= 1
> OUT &H378, 1
> OUT &H378, 3
> n = n + 1
> WEND
> AvgCPS& = (AvgCPS& + n)
> 'PRINT "cycles/second: "; n; "inches/min: "; ((n - 1) / InchFactor%)
> * 60
> 'PRINT AvgCPS& / i
> NEXT i
> PRINT "Average cycles/second: "; AvgCPS& / (i - 1); " Average IPM:
> "; ((AvgCPS& / (i - 1)) / InchFactor%) * 60
>
>
>
> [Non-text portions of this message have been removed]
>
>
> Welcome to CAD_CAM_EDM_DRO@...,an unmoderated list for the
discussion of shop built systems, for CAD, CAM, EDM, and DRO.
>
> Addresses:
> Post message: CAD_CAM_EDM_DRO@egroups.com
> Subscribe: CAD_CAM_EDM_DRO-subscribe@egroups.com
> Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@egroups.com
> List owner: CAD_CAM_EDM_DRO-owner@egroups.com, wanliker@...
> Moderator: jmelson@... [Moderator]
> URL to this page: http://www.egroups.com/group/CAD_CAM_EDM_DRO
> FAQ: http://www.ktmarketing.com/faq.html
> bill,
> List Manager
>