> In order that DOS may find  my 5250 card
> My dosemu.conf currently contains
> hardware_ram { range 0xd0000 0xdffff }
> ports { 0x300 0x3ff }
>    I assume that the above lines are allowable.
> I want to protect port 0x368  and 8k mem at
> and above 0xd0000..

don't you mean you want to access them ?

> Do the above lines do the job???

No - the ports line is wrong. I think it should be
$_ports "0x368"

also if you only need to access 8K at 0xd0000, you could
change the hardware_ram line to 
$_hardware_ram " range 0xd0000 0xd1fff "

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