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ShareWare OnLine Volume 2 (CMS Software)(1993).iso
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1993-04-27
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This alpha (0.65f) represents clean up and the addtion of a new
(undocumented) feature. Virtual IRQs can now be mapped. The
reason the feature is undocumented is because one can get into a
lot of trouble using it. I do not want to figure out the IRQ
setup for everyone that tries to use it.
This may well be the only place that you see me documenting the
IRQ mapping feature.
If you think you find a bug with this feature, let me know.
Otherwise, you will have to work out the problems yourself.
The only case (known to me) where one would want to map the
virtual IRQ is: The real IRQ is in the upper 8 (say 10) and a
DOS program (like ProComm) only supports the lower 8 IRQs. By
mapping IRQ10 to IRQ3, ProComm will then work.
NOTE THAT THE MAPPED (VIRTUAL) IRQ MUST BE UNUSED. OTHERWISE,
YOU WILL GET A "PORT ALREADY IN USE" ERROR.
If you must map an IRQ, your best bet is to map to IRQ3 or IRQ4
which are comm port IRQs.
Examples of the mapping follow:
DEVICE=SIO.SYS (COM3,,IRQ10:IRQ3)
Above, the real IRQ is 10, but it is to be reflected to DOS VDMs
on IRQ3. The DOS program must be configured to use IRQ3.
DEVICE=SIO.SYS (COM1,,:IRQ3)
The real IRQ is automatically detected, but is reflected to DOS
on IRQ3.
DEVICE=SIO.SYS (COM2,,10:3)
Same as the first example with respect to IRQs
DEVICE=SIO.SYS (COM1,,:3)
Same as the second example with respect to IRQs.