Physical memory and Microport Drivers

[John Antypas]

I've got 99% of a hercules graphics driver done and now I'm trying to 
force Sys V/AT to allow me to write to console memory without causing a 
system panic.  The preferred way to do this is:

char	*c

c = gstokv(VIDEOSEL);

which would return a kernel virtual address pointing to video memory. (See
gst.s) and this is the console driver does it, but it doesn't work.  As soon
as I try anything at all, such as:

*c = 0xff

which should put 8 dots on the upper left of the screen,  the system dies.
Any guesses?

John Antypas -- Soft21 --21st Century Software:

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