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-
- Copyright (c) 1995, Paul S. Reid
- All Rights Reserved
-
- .Game, Source Code, and Documentation are Freely Distributable.
-
- Released: August 17, 1995
-
-
- !! NO CHARGE IS TO BE MADE FOR THIS GAME, SOURCE CODE, AND/OR DOCUMENTATION !!
- !! WITHOUT THE AUTHOR'S PERMISSION. A SMALL FEE TO COVER THE COSTS OF !!
- !! DISTRIBUTION IS ACCEPTABLE. !!
-
- !! SEE BELOW REGARDING HOW TO CONTACT THE AUTHOR. !!
-
-
-
-
-
-
-
- INTRODUCTION
- ------------------------------------------------------------------------------
-
-
- Back when pinball was king, "video games" were unheard of. That is, until
- Pong and Space Invaders changed all that. When Pong was first released, and
- later Space Invaders, people didn't think the trend would last. Well, it
- seems it did, and here we are wasting our lunch hours shooting our friends on
- the office network.
-
- Space Invaders was the first "real" arcade game. It contained all the basic
- elements that make the best games today so good. Edge of your seat game play,
- missiles and bombs everywhere, and a challenge to be reckoned with.
-
- I'm sure you all know what Space Invaders is all about, but I'll deliver a
- quick refresher for those of us that are too old to remember, and those of
- us that are too young to know...
-
-
-
-
- THE STORY
- ------------------------------------------------------------------------------
-
-
- The story is the invaders are coming, and they're not cute and squishy like
- Alf on TV. Your job is to defend Earth. Don't let the invaders land at any
- cost!
-
- The military has issued their finest canon to you, the best pilot in the
- world. Everything hangs on your success...Don't let the people of Earth down!
-
- The invaders come in fleets, swooning back and forth above the battle ground,
- dropping a hell fire of bombs everywhere. The invaders descend closer and
- closer to their goal. And what's worse, with every invader destroyed, they
- advance faster and faster.
-
- You must destroy untold waves of invaders to save Earth. But they're not
- stupid. They refine their attack with each wave. They begin their attack
- closer to the planet each time, and release more and more bombs. And if
- that's not enough, they descend faster with each passing wave.
-
- It's a good thing there are bunkers for you to hide under so you can catch
- your breath! And hey...What's that? A UFO passing over the battle site?
- It'll sure be sweet destroying that! That ought to wipe that stupid smile
- off their...er...faces?
-
-
-
-
- BACK TO THE INTRODUCTION
- ------------------------------------------------------------------------------
-
-
- Yeah, well, as I'm sure you've guessed, it's a shoot'em up. But a shoot'em
- up with CLASS [grin].
-
- I wrote this game in a week (or there abouts) in solid assembler. I wanted to
- see what I could do with a game in the smallest amount of memory, and here we
- are: Space Invaders with full graphics (even the original logo from the coin
- op box!) in 9k. Now, that's amazin'...
-
- I have included the source code so people can examine my techniques if they
- so desire. My keyboard interrupt routines, my double buffered video for
- smooth animation, my memory saving sprite routines (all the graphics are a
- single bitplane), and my amazin' collision detection!
-
- Well, okay, maybe it's not all that amazing to everyone, but some people will
- no doubt find it useful (er, I hope).
-
-
-
-
- THE GAME
- ------------------------------------------------------------------------------
-
-
- The game starts up with a title screen (check out that logo - I'm so proud of
- it - I'm not an artist (really, it's true)). Waiting a few seconds will get
- you another screen with a little more information on it, like game controls,
- etc. The first screen gives you game scoring.
-
- Press any key to begin play. Here are the keys you'll need to know:
-
-
- KEYS
-
- Cursor Left - Move canon left
-
- Cursor Right - Move canon right
-
- CTRL - Fire missile (only 1 at a time allowed
- - just like the arcade)
-
- S - Toggle sound on/off
-
- ESC - Exit to DOS pronto!
-
-
- You may shoot the invader's bombs to avoid getting hit, but you will receive
- not scoring for doing so. You're lucky to be alive!
-
- Shoot the UFO when it comes out for a nice fat 100 point bonus.
-
- Use the bunkers for shield, maybe even shoot a hole in one and take out the
- invaders from there (coward)...[grin].
-
- If you are hit, or the invaders land on you, you'll have to start the level
- over again. Sorry, 'dem 'da breaks...
-
- As you wipe out each wave, the invaders will begin their attack lower, speed
- up quicker, and drop more bombs. Can it get any worse, you ask? It could, but
- I don't practice masochism.
-
- A free canon will be awarded every 10,000 points. I can't imagine anyone
- getting more than 2...I'm not even sure it's possible!
-
-
-
-
- THE SOURCE CODE
- ------------------------------------------------------------------------------
-
-
- As I mentioned above, the source code is included. Use it as you will, but
- give me a little credit if you are going to modify the game. By this I don't
- mean put my name on it (unless you hardly changed anything - then don't take
- my name off of it), I mean leave me some e-mail and tell me what you did.
- I'm interested to know what people got out of my work, if anything. And it's
- all I really ask - I don't want money - Just human contact (I'm so lonely!
- I'm kidding...I have lots of friends. Really! (?))...
-
- The source code may be a little rushed here and there. I was a little pressured
- with another work project that needs to get done. I knew if I didn't hurry up
- and finish this, it'd never get done, so I did as good a job as I could in as
- short a time as possible.
-
- I used Turbo Assembler 4.0 to assemble the source listing, and Turbo Link 7.0
- to link it. I suggest you do the same. Borland language products are by far
- superior to anything else available (my opinion - yours may differ, of
- course)...
-
-
-
-
- THE AUTHOR
- ------------------------------------------------------------------------------
-
-
- I'm a student at Kwantlen University College in Richmond, British Columbia
- (Canada!), in my second year of Computer Information Systems (Diploma).
-
- I wrote this game partially out of interest, and partially because my wife
- wanted to play it. So, I dedicate this game to my wife, Deb.
-
- If you'd like to contact me (please do if you enjoy the game, or got
- something out of the source) at:
-
- preid@Direct.CA (internet)
-
- I can not be contacted any other way at the moment (I don't frequent any
- local BBSes anymore it seems - Sigh)...So, those of you with internet access,
- drop me a line and tell me what this package did (or did not) do for you...
-
- Please note that this game and source code are FREE - I don't ask for, or
- expect, any money. Just a friendly letter (e-mail)...
-
- I am planning to write more small (older) arcade games. Have any ideas? Is
- there something you'd like to play? Let me know...I'm open to ideas. I was
- thinking maybe Frogger, Galaxian, Ladybug, or maybe Pacman...Hmmm...Maybe even
- Defender...
-
- Until next time, have fun...
-
-
- ...Paul S. Reid (preid@Direct.CA)
-
-
-
-
- BIBLIOGRAPHY
- ------------------------------------------------------------------------------
-
-
- Books and resources used in the development of Space Invaders:
-
-
- Mastering Turbo Assembler (Very highly recommended)
- Second Edition
- Tom Swan
- 1995, Sams Publishing
- ISBN 0-672-30526-7
-
- Assembly Language Quick Reference (Highly recommended)
- First Edition
- Allen L. Wyatt, Sr.
- 1989, Que Corporation
- ISBN 0-88022-428-2
-
- DOS Programmer's Reference (Newer edition as of this writing - Recommended)
- Third Edition
- Terry Dettmann, Jim Kyle, Marcus Johnson
- 1992, Que Corporation
- ISBN 0-88022-790-7
-
- Dan Gookin's Guide to Underground DOS 6.0 (Excellent DOS spelunking book)
- First Edition
- Dan Gookin
- 1993, Bantam Books
- ISBN 0-553-37097-9
-
- Programmer's Guide to the EGA, VGA, and Super VGA Cards (A-1 Tech Info)
- Third Edition
- Richard F. Ferraro
- 1994, Addison-Wesley
- ISBN 0-201-62490-7
-
-
- Books and resources recommended to the developer and generally curious:
-
-
- Mastering Borland C++ 4.5 (Very highly recommended - Nice pages!)
- Second Edition
- Tom Swan
- 1995, Sams Publishing
- ISBN 0-672-30546-1
-
- Mastering Turbo Debugger (Excellent book - May be a newer edition?)
- First Edition
- Tom Swan
- 1991, Hayden Books
- ISBN 0-672-48454-4
-
- Mastering Turbo Pascal 6 (Great Pascal book - New edition available?)
- Fourth Edition
- Tom Swan
- 1991, Hayden Books
- ISBN 0-672-48505-2
-
-
- How can you tell I'm a Tom Swan fan? I've used his books to learn most of
- the languages above (Pascal, Assembler, C/C++) - Good stuff!
-
-
-