Hi Andrew, > As far as I can tell, PCI parallel port cards do not work under FreeDOS.
Who said that? > Is that true? Does anyone have any guidance on getting PCI parallel > ports to work under FreeDOS? PCI cards are highly configurable, but they can also provide ordinary and very much ISA compatible resources. Yet most on- board printer ports are in the ISA subsystem. Which still exists, as a part of some chip there, even without ISA slots. You can expect problems if you try to do ISA style DMA to or from the printer port, but if you use BIOS functions, things should be okay. DMA is more or less the only compatibility problem between PCI and ISA. You can also have problems if arbitrary IRQ numbers are assigned to your "should use known IRQ number X" ISA device by a PnP BIOS or OS which can be in the mood to do that, too. Sometimes IRQ 5 or 7 (printer port ones) are not even on the PnP PCI IRQ choice list. Then your programs will have to use whichever other IRQ number you get, if they use IRQ at all for the printer port. Or you will have to write a wrapper which calls the expected IRQ 5/7 handler whenever the actual PCI IRQ of your card is triggered. That would be a really small piece of software :-). Eric ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ Freedos-user mailing list Freedos-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freedos-user
