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    Corridor 7: Beta Invasion Version 0.69

    Nexion
    Nexion
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    Corridor 7: Beta Invasion Version 0.69 Empty Corridor 7: Beta Invasion Version 0.69

    Post by Nexion Wed Aug 17, 2022 2:40 am

    In a time of cold and lonely nights in December 1993 when people were hunting demons on phobos, there were still more demonic aliens hiding in the dark. Well hidden, they rarely made it out of the shadows of thy Doom.

    Roughly 2-3 months before Doom and Blake Stone would be released, the development of Corridor 7 had started. We are entering the year 1994 and there is a thirst for more. Soon after, Corridor 7 was released.
    It is not unlikely that due to the late start on development things were more rushed. Rushing things seemed to be generally a Capstone Software trend.

    This was still many months before Operation Body Count was even in development. For some reason many websites tell you that Body Count was released first, which makes as much sense as terrorist-trained killer rats.

    This is a short summary of an early build (JAN 1994) of Corridor 7.
    Trying to be more less accurate, there might be some errors and some sections are incomplete. The audio, especially the sounds, still need a closer look as well as the AI and small gameplay adjustments.

    Corridor 7: Beta Invasion Version 0.69 Title10

    The pre-release was about 3 months ahead of the full release and it was 3 months after project started, according to design documents by Les Bird (Lead Programmer). Even being in the middle of development, this version is for the most part what you can see in the final release.

    This demo/beta is dated at beginning of January of 1994 and was released on a German Shareware games disc collection. It’s called “202 Games Spezial” and published by Mustang. It might be dated to September 1994 (long after the final release) and if so then either someone sent them the wrong files or they got it from some mysterious source.

    Apart from that there is another early (beta) version, a demo, a full floppy release and the final CD release.
    The version covered here should be the earliest existing version.

    Corridor 7: Beta Invasion Version 0.69 Menu_m10

    ============================= A brief overview of the releases:

    BETA-DEMO / early JANUARY 1994
    • 3 levels 
    • 131 textures 
    • 440 sprites (178 of those being Wolf3D) 
    • 77 images (vga) 
    • 37 adlib sounds 
    • 37 pc sounds 
    • 46 digi sounds (46 from Wolf3D) 
    • 2 imf music tracks in audiot + joesnd file

    BETA-DEMO / end of JANUARY 1994 
    • 1 level 
    • 136 textures 
    • 459 sprites (62 of those being Wolf3D) 
    • 84 images (vga) 
    • 34 adlib sounds 
    • 34 pc sounds 
    • 11 imf music tracks

    DEMO / middle of MARCH 1994 
    • 1 level 
    • 136 textures 
    • 416 sprites 
    • 39 images (vga) 
    • 64 adlib sounds 
    • 64 pc sounds 
    • 64 digi sounds 
    • 8 imf music tracks

    FLOPPY RELEASE / end of MARCH 1994 
    • 36 levels 
    • 136 textures 
    • 598 sprites 
    • 55 images (vga) 
    • 83 adlib sounds 
    • 83 pc sounds 
    • 83 digi sounds 
    • 34 imf music tracks

    CD RELASE / JULY 1994 
    • 59 levels 
    • 256 textures 
    • 858 sprites 
    • 72 images (vga) 
    • 100 adlib sounds 
    • 100 pc sounds 
    • 100 digi sounds 
    • 34 imf music tracks + 4 audio CD tracks


    Corridor 7: Beta Invasion Version 0.69 Title110
    Click on the image if it doesn't display fully.

    ============================= GRAPHICS

    Let’s start with something more familiar, like Wolf3D. The beta version still has some Wolf3D assets sitting in the files and the dog is even running around in the second level. Below is a picture showing some of them, but not all the frames and most of them are using the wrong palette. Most curious part is one of the death frames having a grey sphere. Possibly an early test for future concepts.

    Corridor 7: Beta Invasion Version 0.69 Wolf10 Corridor 7: Beta Invasion Version 0.69 Pal10

    First, a rather boring and tiny detail. Left are the original keys/map for the hud display and on the right you can see the ones from the beta. There are small differences for the color cycling. 300% zoom for better viewing.

    Corridor 7: Beta Invasion Version 0.69 Hud_ke10


    Time to face the walls. There are several walls in the final release that already existed in the earlier version, but with minor changes to them. Nothing too drastic to see here.
    There are a few details which got changed like the word “EMPTY” on the ammo machine. The crates seem to stand out more in the beta due to the contrast and the differing brown shades in the palette. Several textures also have been adjusted just for the color cycling.
    Left is the full release. Right side shows the beta version.
    Corridor 7: Beta Invasion Version 0.69 Walls_11 Corridor 7: Beta Invasion Version 0.69 Walls_10

    Now for the wall textures that didn’t make the cut into the full release and only exist in this early version. Slot-wise they haven’t been really added or removed. Most of the graphical frames seem to have already existed at this point. For example at the spot in the data file where you can find the metal bar gate, you will find an animated door in the later full release. They kept the layout of most things and mainly swapped the graphics themselves to something similar. 

    Corridor 7: Beta Invasion Version 0.69 Walls_12

    The sprites have a similar twist to them like the textures. There aren't a lot changes between the versions. The death animations are still bit rough and one of the weapon items got split into 2 items. 

    Corridor 7: Beta Invasion Version 0.69 Obj_or10 Corridor 7: Beta Invasion Version 0.69 Obj_be10


    Next are objects that don’t show up in the final release. Not too many but few interesting ones like the shades pick up or a crystal pillar.

    Corridor 7: Beta Invasion Version 0.69 Obj_ne10

    The beta contains 3 odd sprites. The ceiling grass/slime was used for the hanging corpses in the end. Depending on the editors you use you may or may not see some glitched pixels on the other 2. If you encounter either the plant or table it will freeze the whole game. 

    Corridor 7: Beta Invasion Version 0.69 Obj_od10

    The biggest difference is probably that the Probe (flying eye with turrets) used to be a robotic drone. It might be the “Tracker” enemy concept mentioned in the design documents.

    Corridor 7: Beta Invasion Version 0.69 Obj_en11 Corridor 7: Beta Invasion Version 0.69 Obj_en10

    The weapons are all smaller and more simple compared to the final release. Projectiles already existed in this early version. Most made it to the final release but got changed drastically, with the assault rifle/M-16 changed the least and the plasma launcher the most.
    The knife is mentioned in the design document as “Bayonet” but didn’t make the cut.

    Corridor 7: Beta Invasion Version 0.69 Obj_ne11 Corridor 7: Beta Invasion Version 0.69 Weap_k10 Corridor 7: Beta Invasion Version 0.69 Weap_g10 Corridor 7: Beta Invasion Version 0.69 Weap_m10 Corridor 7: Beta Invasion Version 0.69 Weap_r10

    ============================= GAME

    The game itself plays and looks pretty much like it would months later. Nevertheless, there are differences:
    • Files have the WL6 extension and use the same files+names (e.g. VSWAP.WL6) WOLF3D has.
    • Many of the 3D image/intro renders (used in intro/menus) are already existing but are used in different ways.
    • Credit sprites still lack shading. 
    • Rocket launcher item is 1 pixel higher. 
    • It got the tentacle skull boss but the animation is worse. 
    • Credits screen doesnt mention music. It has 1 programmer and 1 artist less on it. Also got note “Graphics Engine by Id Software”. 
    • Tile8s are broken.

    • The palette has some small changes in the brown color row.


    Corridor 7: Beta Invasion Version 0.69 Credit10

    MENUS & AUDIO
    • There is no intro story or any highscore screen after the title.
    • Menus are different and incomplete. 
    • Save/Load Game menu isn’t accessible.
    • Music volume slider in the menu seems to be working reverse for digitized music. Maybe a reason the music got removed.
    • Has option for digitized music which uses the “joesnd file” by Joe Abatti. 
    • The digi music format is in 9000 Hz 8-bit mono. 
    • The menu doesn’t have any digitized music track. 
    • Digitized music pauses when digitized sounds play. The music might be made of short samples. 
    • One digitized track uses the death scream of the player. 
    • The 3 audio tracks are quite different and seems more groovy or experimental. Maybe closer to Body Count’s audio CD tracks. 
    • The digi music might have been pushed back due to technical difficulties or the problem of storing enough songs on a floppy disk. 
    • Some of the audio tracks were remixed for the later CD release.
    • There are 46 digi sound files in the VSWAP but they are all from Wolf3D.


    Corridor 7: Beta Invasion Version 0.69 Menu_a10

    Glitches
    • There are 2 rooms in the first level that can freeze the game. 
    • Demo (after intro) runs into one of those rooms and freezes. 
    • F7-F9 screws up statusbar and borders. 
    • Window size menu has the wrong size when entering it from max viewsize.
    • DosBox freezes right at start of the level if cpu cycles are set too high. Same goes for lowering the viewsize and lower cpu cycles. In other words, the game dies if it hits a certain framerate. Different side effects in real DOS may occur.
    • Enemies inside masked doors can’t be damaged. Operation Body Count got the same issue. 
    • Masked walls clip through masked doors while opening/closing (was not fixed in later versions). 
    • Masked walls can also disappear entirely.


    Corridor 7: Beta Invasion Version 0.69 Doorgl10 Corridor 7: Beta Invasion Version 0.69 Doors10

    MISC
    • Automap has a different color theme. There is an item to unlock the whole map. Uses ‘M’ key instead of TAB. 
    • Grey floor color instead of purple as in the final version.


    Corridor 7: Beta Invasion Version 0.69 C7_aut10

    • Gunfire doesn’t affect the floor/ceiling shading. 
    • Shading is darker and more intense on the ceiling. 
    • Gun bobbing is less extreme and in a different style but still depends on run button. 
    • Weapon bobbing of the knife is quite more extreme and looks like constantly stabbing something. 
    • Just pressing “run key” doesn’t make you slide around like in the full version. 
    • Weapons and HUD overlay “info” bars on bottom if window size is on max. 
    • Ammo for weapons #3 and #4 regenerates fast automatically. 
    • The player has lives and is thrown back to the menu after getting a glitched score screen.


    Corridor 7: Beta Invasion Version 0.69 Gameov10

    • level1diagnostic debug line works but requires pressing alt+lshift+backspace like wolf3d. 
    • TAB+L debug code makes wall shade flicker like gun fire but in a darker variation. 
    • TAB+T shape test debug code is still there but some sprites can crash Dosbox. 


    Corridor 7: Beta Invasion Version 0.69 Menu_c10

    ENGINE
    There are dotted bars on the bottom of the HUD which seems to give away some clues about the game. Possibly raycasting checks.

    Corridor 7: Beta Invasion Version 0.69 Dots10

    • White bar goes up when a masked door is visible. The closer the bigger the bar.
    • Yellow bar. No idea so far.
    • Green bar seems to be an indicator for the walls. 


    A small difference in memory usage.
    Corridor 7: Beta Invasion Version 0.69 C7_mem10


    ============================= LEVELS 

    If this version was released to the public on purpose then it was probably intended for only the first level to be accessible and playable. There are two more in the files, accessible through debug commands.

    Corridor 7: Beta Invasion Version 0.69 Level110

    Level 1: 
    • Actual demo level that shares a few similarities with the first level of the full release.
    • There are 2 rooms on the map that can freeze the game. At start behind at the windows to the left and one on east side after a glitching wall. Possibly caused by 2 corrupted sprite objects.
      You can prevent that by walking backwards around the critical sprite.
    • It is possible to complete the level, telling you the demo is over.

    Level 2: 
    • A big square room that seems to have formed the base for a lot levels.
    • It has animated masked doors with the wrong graphics.
    • It got a massive room that creates slow downs.

    Level 3: 
    • Several rooms but seems to be rather a dev map and consisting of test rooms 
    • It features the sun glasses item and automap item. 
    • Has 2 Wolf3D dogs running around. 
    • Possible test rooms for animated walls and their speed.
    • There is a wall that isn’t in full release as test for the health chamber (flashes yellow and does a 180 degree spin).


    Corridor 7: Beta Invasion Version 0.69 C7_lev10
    Click on the image if it doesn't display fully.

    ============================= GALLERY 

    Here are some screenshots in case you are tired of the article for this chaotic game. The statusbar looks especially rough.
    Overall, the design and style of the game stayed pretty much the same until the end of development. They mainly kept adding gasoline to the fire over the next months. Quality remained the same for the final releases. Some things got fixed or adjusted but for the most part enemies, weapons, graphics, music, levels were added. Bit more of everything or rather more of the same. If you have never liked this game then any of the other versions won't fill you with happiness either.

    BETA 1 / early JANUARY 1994
    Corridor 7: Beta Invasion Version 0.69 C7_bet10 Corridor 7: Beta Invasion Version 0.69 C7_bet11 Corridor 7: Beta Invasion Version 0.69 C7_bet12 Corridor 7: Beta Invasion Version 0.69 C7_bet13 Corridor 7: Beta Invasion Version 0.69 C7_bet14 Corridor 7: Beta Invasion Version 0.69 C7_bet15 Corridor 7: Beta Invasion Version 0.69 C7_bet10 Corridor 7: Beta Invasion Version 0.69 C7_bet16

    BETA 2 / end of JANUARY 1994
    Corridor 7: Beta Invasion Version 0.69 C7_bet17 Corridor 7: Beta Invasion Version 0.69 C7_bet18 Corridor 7: Beta Invasion Version 0.69 C7_bet19 Corridor 7: Beta Invasion Version 0.69 C7_bet20 Corridor 7: Beta Invasion Version 0.69 C7_bet21

    ============================= GAME OVER

    There are still details missing in this long corridor made out of text but as in the style of the game this is incomplete and possibly buggy.
    Doomed from the start, the game has some pretty cool ideas and a great atmosphere. Sometimes it helps a game to be rough around the edges to give it a character. Take some DNA of a Xenomorph, rip out Wolf3D’s gut, add the spirit of Doom and you get this piece of entertainment.
    If you ever feel bored, there are more than 7 corridors to get lost in. Give it a try or just go play Body Count!

    Corridor 7: Beta Invasion Version 0.69 Soon10

    P.S. This was originally hosted on Zombie's wolf3d.net site. It's here now due to his differing opinion on how a community should look like.
    stathmk
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    Corridor 7: Beta Invasion Version 0.69 Empty Thank you & alternate ending

    Post by stathmk Wed Aug 24, 2022 1:06 pm

    Nexion wrote:
    ...P.S. This was originally hosted on Zombie's wolf3d.net site. It's here now due to his differing opinion on how a community should look like.
    At this moment, https://beta.wolf3d.net/ is down.  Thank you for posting this.  I'll reread it.

    If I'm thinking of the correct game, I believe somebody ported Corridor 7 to Doom 2: Hell on Earth including the code for the alternate ending level.  Edit:  Just do a Bing search for...

    "Corridor 7" "Doom 2"

    ...and the 2020 file is more recent than the file that I thought that I posted onto Wolfenstein Goodies.  I might eventually do an archiving project on Wolfenstein Goodies if I'm up to it.
    Thomas
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    Corridor 7: Beta Invasion Version 0.69 Empty Re: Corridor 7: Beta Invasion Version 0.69

    Post by Thomas Mon Aug 29, 2022 7:29 am

    Love articles like this. So many details one might miss, and the story of Corridor 7 is definitely an odd one. It is a shame that it never really reached any kind of popularity; then again, the PC gaming landscape changed considerably between 1992 and 1996 in proportions that seem kind of unbelievable with modern eyes.

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    Corridor 7: Beta Invasion Version 0.69 Empty Re: Corridor 7: Beta Invasion Version 0.69

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