Hi Group! I am going to install dosbox on a linux system to use some old proprietary control software that directly accesses an ISA-Card that controls stepper motors. Hardware: Pentium 233 or PentiumII 233 on ATX-Board with some ISA-Slots and a "Kuper Control RTMC48" Card (used for Motion Control applications) on http://www.kupercontrols.com/Kuper/Products/Kuper2001/K2001.html is a picture of its successor. It is used to control stepper motors. I assume it is very important, to have very little interrupt jitter with dosbox direct hardware access. I haven't seen the card itself (it was built into an old computer on a Film Production Set) but I have seen the system up and running. I will figure out its IRQ and IOPORT and use DOSBOX's Direct hardware access. Of cause it depends on how the card manages Timers, and in what manner Interrupts are used. Is there anyone out there who got anything comparable running satisfactory? I expect interrupt jitter to cause the stepper timings to run out of range. Should I use a faster Computer to start with? :D Hmm, maybe I should, but the jitter question is the same. What are your suggestions and experiences? Stefan Diercks -- To unsubscribe from this list: send the line "unsubscribe linux-msdos" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html