Find your MDF (Monitor Definiton File)
!Boot.Resources.Configure.Monitors.VirtualAcorn.VRPC-SE
Make a backup of this before continuing
Add the following block of mode definitions somewhere that makes sense.
# 1680 x 1050 (30Hz)
startmode
mode_name:1680 x 1050
x_res:1680
y_res:1050
pixel_rate:54000
h_timings:166,90,96,1680,96,0
v_timings:3,32,0,1050,0,3
sync_pol:0
endmode
# 1680 x 1050 (51Hz)
startmode
mode_name:1680 x 1050
x_res:1680
y_res:1050
pixel_rate:92000
h_timings:160,188,82,1680,82,0
v_timings:3,21,0,1050,0,1
sync_pol:0
endmode
# 1680 x 1050 (75Hz)
startmode
mode_name:1680 x 1050
x_res:1680
y_res:1050
pixel_rate:132000
h_timings:166,90,96,1680,96,0
v_timings:3,32,0,1050,0,3
sync_pol:0
endmode
Save the file once you have finished - to test it drag the new file to the monitor icon on the iconbar and select your new mode(s) from the menu. If you have done it right it will work - if you haven't it won't, so go back and check it again. Note that these modes will NOT work on a real machine, only on a VirtualAcorn. And just for fun I have written them from memory and havn't even tested them.
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