.ps 50,72 .br 1 MissleCmd .skip 1 This is the VAX version of the well-known arcade game by the same name. .skip 1 .br 2 Instructions .skip 1 This game is similar to the arcade game, MISSILE COMMANDER. As written, it must be played on a VT100 video terminal. You have under your command three missile bases, and six cities that you must protect from incoming attacking bombs. Attacking bombs consist of normal bombs, which appear on the screen as asterisks, and smart bombs, which appear as circles. Both types of bombs fall from the top of the screen towards your bases and cities on the bottom. Smart bombs differ in that they are more likely to destroy a target if not eliminated, and that they are harder to destroy. .skip 1 Each of your three missile bases is equipped with ten missiles which you can fire at the attackers. Firing is accomplished by positioning your gunsight and firing a missile from one of your bases. Positioning your gunsight, which appears as a plus sign on the screen, is accomplished by use of the VT100 keypad keys, 1 through 9. The keys move the gunsight in the direction relative to their position, that is, the 8 key moves the site up, the 3 key down and to the right, etc. The keys do not need to be held down. Once a key is hit, the gunsight will move in that direction until it hits the edge of the screen, or until the 5 key is hit. The 5 key stops the motion of the gunsight. It takes some practice to get used to controlling the gunsight, in particular the "move and stop", "move and stop" motions necessary for firing. Firing of missiles is accomplished by hitting the "A", "S", or "D" key. The "A" key fires a missile from the leftmose base, the "S" key from the middle base, and the "D" key from the rightmost base. Beneath each base appears a display of the number of missiles still remaining to be fired from that base. If you attempt to fire a missile from a base that has none left, or has been destroyed, the VT100 will emit a beep to alert you. .skip 1 When a missile is fired, it will explode at the location of your gunsight when it was fired. There is a delay between when you fire and the explosion occurs, based on the distance from the base to the location, so it may be necessary to "lead" the targets you fire at. Explosion of the missile is indicated on the screen by a cloud that increases in size, holds at its maximum size briefly, and then recedes to nothingness. Any bomb positioned within the cloud will be destroyed. It is not necessary to hold your gunsight at its location after firing, in fact it is recommended that you move on to the next target immediately after firing, and not wait for the results of that missile. .skip 1 The game consists of a series of attack waves. When each wave completes, a new (more difficult) one starts after a brief pause. Your missile bases are rebuilt and rearmed with ten missiles after each wave. Destroyed cities remain destroyed, except that you receive a new one for each 10000 points you score. Periodically, a bomber ( => ) may move across the screen and drop a bomb. You can destroy it just as you destroy bombs. The game ends when all of your cities have been destroyed. You may also exit the game at any time by typing a control-C. The screen can be "frozen" for interruptions or distractions by typing a control-S (or no-scroll) and unfrozen by typing a control-Q (or no-scroll). Your terminal should be set /NOWRAP for this game! .skip 2 .nofill The scoring of the game is as follows: .skip 1 each city saved at the end of a wave - 100 points (**) each missile not used during a wave - 10 points each bomb destroyed - 25 points (**) each smart bomb destroyed - 50 points (**) each bomber airplane destroyed - 100 points (**) .skip 1 .fill ** - first wave score. these scores double on the second wave, triple on the fourth wave, quadruple on the sixth, and so on up to the 24th wave. .skip 1 Enjoy!!