	Differences Between JET Version 2.12 and its Predecessors





	Title Page
		now appearing in CGA and Hercules-compatible modes

	Dos-ability:
		Copy protection has now been removed.
		All files may now be loaded onto hard disk.
		Select from multiple scenery disks on a single drive.

	Concurrent drivers (memory allocation):
		Jet no longer needs to be loaded in fixed memory locations,
		   which, in previous versions, precluded various drivers.
		   Now JET runs with many other programs or drivers loaded.

	Works with IBM PS/2 line (Micro Channel)

	New Menus
		more readable, consistent for all display types, DOS friendly
		more selections: screen displays, scenery areas
		full mobility throughout (forward/back and exit)
		'x' in any menu returns you to DOS
	
	New Demo
	    including:
		sample aerobatics
		target strike simulation
		parachute ejection
		positioned text messages as demo progresses
		sampling scenes from the best of scenery disks

		Demo scenery is also available for free flight mode.


	Zoom factors:
		1, 2, 3 .. 9, doubling each time instead of
		1, 2, 4, and 8


	Higher Resolution Displays:
		EGA 320x200
			This display is twice the resolution of a standard
			EGA screen, and 16-colors are used, as opposed to the
			four-color-at-a-time CGA emulation mode.

	
		EGA 640x350 enhanced modes 1 and 2
			If you have an EGA, you will probably want to use these
			options.  Depending on what EGA card you have, how it
			was installed, and what type of monitor you have, will
			together determine which of these options you will want
			to use.  Most EGA's with enhanced monitors we've seen
			look better with mode 1 ('j').  Mode 2 will use the same
			color combination as EGA 320x200.  Mode 2 will appear
			marginally acceptable with many washed-out greens if
			you should be using mode 1.  The carrier under mode 1
			will appear to be floating on a black sea while in the
			target strike game if you should be using mode 2.

	Mouse control:
		two-button drag:
			forward/back throttle
			left: brakes,	right: brake release
		left button:	cycle selected weapon
		right button:	center aileron and elevator
		forward/back:	pitch control (elevator)
		left/right:	bank control (ailerons and rudder coordinated)



	Loadable scenery files (no longer only scenery disks):
		Run the program on this disk called "mscenery," and follow
		the directions given there to convert your SubLOGIC scenery
		disks to work with JET.  To select the scenery disk you want
		from within JET, type 'e' for "Load Scenery" on the Operating
		Mode Selection Page.  The second subsequent menu will allow
		you to choose a scenery area from among those in your current
		drive's selected subdirectory.  This means you should generally
		place all your scenery files in a subdirectory with your JET
		files.

		Old-style SubLOGIC scenery disks are still (again) supported
		and selectable from the Scenery Selection Menu (which is new,
		and provides much more flexibility).  If you use Scenery Disks
		(as opposed to scenery files), these scenery disks must be
		placed in drive "A:".

		Particularly useful if you have only a one- or two-floppy drive
		system is the option (from the Scenery Selection Menu) to scan
		another drive for scenery files.  In this way, converted scenery
		files may be accumulated in the default subdirectory on any
		available disk drive, not necessitating scenery files to exist
		in the same subdirectory or drive as the original JET program.

		Using an IBM FSII disk as a scenery disk will allow you to fly
		around the standard FS scenery (a previously unadvertised
		feature.


	Landing Gear
		Now the jets are physically (visually) equipped with landing
		gear, which is visible from tower viewing mode.


	Joystick(s)
		You may enable up to two joysticks now, with the second stick
		being used as a throttle.  When enabling a second joystick (from
		the keyboard selection menu page, with repeated 'j' keypresses),
		have the first joystick centered, and the second joystick pulled
		all the way back, to indicate the throttle idle position.  The
		joystick routines have been improved to fly more consistently on
		the full spectrum of IBM and compatible machine speeds.


	Coordinate Systems Access:
		As never before, JET allows you see where in the coordinate system
		you are flying.  This allows you to compare your actual location
		versus where you may think you are on a scenery disk, or the
		default scenery areas in JET.  Pressing 'z' while flying the JET
		toggles location information which is displayed at the top of the
		screen.  Use this information to set coordinates at the "Scenery
		Load Menu" to be able to avoid having to fly great distances to
		get where you might want to be.



	Internal improvements:
		Overall speed improvements
		Flight characteristics improved
		Higher precision calculations
		Properly restores current time on exit to DOS



	Requirements:
		Jet requires 120K of memory, after DOS has been loaded.  For
		this reasons, "128K" PC Jr.'s, which typically have about 80K
		of memory after DOS has been loaded, won't work with Jet 2.12.



	NOTE on Version 2.12:  A bug was found which prevented some scenery
		from displaying as quickly as it was designed to function on
		the faster machines.  This bug is now fixed in this version.
		All other aspects of JET are identical.  Another bug involved
		the scenery buffer to overflow.

	


			Jet Demonstration Program



  This disk also contains a self-running demo of SubLOGIC Jet for the IBM PC/XT
/AT, PS/2 and compatibles.

  To begin the demonstration, place the floppy disk in any available drive,
set DOS to that drive (if you're not already there), and type "jet" at the DOS
prompt.  After viewing the title page, press the SPACE BAR to continue.  A menu
will appear listing screen display options.  Select the appropriate screen
display, keyboard, and demo mode by typing their associated letters.  From this
oint the 10-minute demonstration will repeat continuously, until either the
machine is turned off, or ESC is pressed.  ESC returns the machine to the game
selection menu.

  The files on this diskette may be loaded onto any hard disk and run in the
same manner there as from the floppy disk.


							SubLOGIC Engineering
