-- From memory (as both D-Day MKII and War in the East took account of the 
-- difference in these ROMs), the JSU still manages 512x256 pixels, but the 
-- graphics characters (founts) are smaller than on the European QL.

The QL Technical Manual says:

"This is different for countries where the television system is NTSC, which 
permits the use of fewer raster lines than PAL. In QLs for such countries, the 
following options are the defaults:
For monitor operations, a 50Hz 624 non-interlaced system is used; this is the 
same system as is used on the English QL. The full 512x256 pixel display is 
available, and the default windows and character size are the same as for the 
monitor mode on an English QL.
For TV operation, a 60Hz 524-line non-interlaced system is used in which the 
number of raster lines is limited to 192. In order to ease the task of software 
conversion, an alternate display font is provided which allows a 6x8 character 
square instead of the usual 6x10. This ensures approximately the same number of 
visible rows of text on both PAL and NTSC QLs, at the cost of true descenders 
and reduced vertical spacing. The default windows and graphics scaling for TV 
operation are different from those of the English QL."

so it looks like only the TV modes would be different from European boxes.

Cheers,
Tobias


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