MSDOS system with Pentium Motherboard

Hi,

I'm doing a testing at the moment with the configuration mentioned above : MSDOS system (not Windows) with a Pentium Motherboard (used to be 486 processor).

I realised that some of my older programs that uses the serial port is no longer working.

Any one has any idea on what's the main problem with this configuration?

Thank you in advance.

Have you tried changing the cables?

cables??

do you mean the RS232 cables?