Hercules isn´t MDA in some cases.
An Hercules or MDA can be detected by looking on the 7th bit of the
status register on port 0x3BA. MDA doesn´t use this bit, Hercules
does. On the vertical Retrace Hercules set this to ´0´
(Source (don´t laugh!!): Bomanns, "Das große GW-BASIC Buch" 1991, DATA
BECKER)
On a MDA you cannot use graphic-modes, on Hercules you can (720x348, 2
colors).
I think, more than 25 lines is a special graphics mode, so MDA cannot
show it.
Does anyone know more about it?
Greetings
Raphael Becker
-- _ Powered by SuSE 6__ __ ____ ____ _ | | (_)_ __ _ _\ \/ / |___ \ |___ \ / | | | | | '_ \| | | |\ / __) | __) | | | Raphael | |___| | | | | |_| |/ \ / __/ _ / __/ _| | Becker |_____|_|_| |_|\__,_/_/\_\ |_____(_)_____(_)_|- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.rutgers.edu Please read the FAQ at http://www.tux.org/lkml/