How can DOS app perform illegal operation?

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May 23rd, 2001, 05:45 PM
Chapin

How can DOS app perform illegal operation?

I have a win98 system running some DOS apps (accpac, easypay, and dataeasy)this system prints to 3 local lpt ports, the problem is when accpac or easypay are accessed for the first time during the day and I try to print it will kick me right out of the program and the error message comes up "This program has performed an illegal operation" I go back into the apps and they will run fine all day, till next day when it happens again.
I have left the system on all night, it runs a schedule back up on colorado backup, it treats it as a restart, because the same problem appears the next morning.
Has any one experienced illegal operations in DOS apps? Any insight would be very helpful, Thanks. :confused:
May 23rd, 2001, 07:55 PM
condor

Basically this probelms happens because one application is trying to access amemory address already assigned to another application..

sorry I can't offer more help..

those cases often require the "hands on" approach..
May 24th, 2001, 07:55 AM
Mr_Miyagi

Quote:

Originally posted by Invisible_Man:
I have a win98 system running some DOS apps (accpac, easypay, and dataeasy)this system prints to 3 local lpt ports, the problem is when accpac or easypay are accessed for the first time during the day and I try to print it will kick me right out of the program and the error message comes up "This program has performed an illegal operation" I go back into the apps and they will run fine all day, till next day when it happens again.
I have left the system on all night, it runs a schedule back up on colorado backup, it treats it as a restart, because the same problem appears the next morning.
Has any one experienced illegal operations in DOS apps? Any insight would be very helpful, Thanks. :confused:

you should look in the direction of the "backup" and DOS... i have known the disconnection of "services" when doing scheduled tasks so that when returning the app in question is confused and crashes. the other theory i am leaning towards is the dos app does not like being "left" while windows takes control and does the backup; so when you return it crashes in protest!

;)