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WHAT IS SRC?
Simulation RPG Construction (SRC) is an old freeware Japanese engine akin to RPGMaker for both creating and playing Super Robot Wars-like games.

This pastebin will have information on getting it running and some information on SRC Dungeon - a popular scenario pack.

Downloads:
SRC Engine main program:
http://www.src-srpg.jpn.org/
Installation instructions:
http://www.src-srpg.jpn.org/play_installmanual.shtml

Visual Basic 5 Runtimes: (Required to run SRC)
http://www.src-srpg.jpn.org/download/runtime.exe
http://download.microsoft.com/download/vb50pro/utility/1/win98/EN-US/Msvbvm50.exe

SRC Dungeon:
http://freegame.on.arena.ne.jp/simulation/game_4011.html

Mirror: Use if you can't get it straight from source (Version as of 2015/12/30)
http://www.mediafire.com/download/08v8ivkt9pwaptx/Robot_Dungeon_Ver10.12b.zip

Basic Setup Steps
0.5) Run all steps in Administrator Mode for permissions, if necessary

1) Set BOTH your System Locale and the "Formats" setting (i.e the system date etc should be in Japanese) to Japanese.

If you miss doing one, especially forgetting to change the Formats (sometimes known as "Standards and Formats" ), the program will crash with a Run-Time Error when you attempt to select a unit.

2) Install the Visual Basic 5 Runtimes

3) Unzip the SRC files now - if you have done the steps in order, the filenames should be in Japanese - if they are in gibberish square boxes, delete and unzip the files again. Make sure they keep their folder path structure.

(Starting SRC Dungeon)
4) Run SRC.exe, change file type to .eve and open "スタート(2/3).eve" - each of the different Start files corresponds to a different Game Mode for SRC Dungeon - I suggest スタート3 for beginners (known as Cross Mode).

The process to run other scenarios tends to be very similar - find a file usually named スタート.eve or similar and run it.

Elaboration on changing the System Locale:
SRC requires your OS to be in Japanese setting to run. This is a reversible change which will have almost no effect on your computer other than changing the display of backslash to a Yen sign, and is helpful for running other Japanese games such as fan-translated Visual Novels.

Different Windows versions have different methods of changing the System Locale, here's an example of how to accomplish this in Win 7

  1- Open Region and Language by clicking the Start button Picture of the Start button, clicking Control Panel, clicking Clock, Language, and Region, and then clicking Region and Language.

  2- Click the Formats tab, and then, in the Format list, select the "Japanese" locale to use for the display of the date, time, currency, and measurements.

  3- Click on Regional and Language Options

  4- Click the Administrative tab, go to "Language for non-Unicode Programs", and select "Japanese (Japan)" from the drop-down menu.

Alternative Methods: Locale Emulator
This method is suggested for those who cannot get the above methods to work (especially Windows 8/8.1 users) using a third-party program known as "Locale Emulator"

Download: https://github.com/xupefei/Locale-Emulator/releases

1) Run LEInstaller.exe. Install
2) Run LEGui.exe, I didn't need to change any settings.
3) To start the game, Right click SRC.exe, select Run as Japanese (Adminstrator) in the context menu

This method has been tested personally to work on Windows 10. There has been reports of it working for Win8/8.1 users.

You can also use this program while running Winrar if you're getting the "gibberish file names" issue. (Untested)

SRC DUNGEON INFO:

Basics:
SRC Dungeon is a game similar to the original SRW 1 where you pick a starter unit of choice, enter a randomized map and potentially recruit an ally per level in order to bolster your forces and move on. There are several mode with the original being a more "Sandbox" type endless experience and Plus/Cross modes, which has a more traditional game structure with boss battles every 5 floors and ending at 30F with a massive conclusion where you can deploy up to ~40 units.

Recruiting new units must be done with your "Leader" unit, although the current leader can be changed during Intermission. The method depends on the mode played

Original: Use the special Persuade command after moving next to the unit, success percent based off target's remaining HP (think Pokemon capture)
Cross: Simply destroy the recruitable unit with your leader unit and you will get a dialog box to recruit it.

Wiki:
http://wikiwiki.jp/rdsrc7/

The SRC Dungeon wiki is rather outdated, but contains a lot of information such as Unit/Pilot data and information on the game mechanics (like differences between Game Mode)

Menu Translations:
Sample Menu Translation pictures for Intermission and certain basic common in-Battle commands (obviously, I am unable to translate every single variation of abilities in the game - I suggest self-learning Katakana)

http://imgur.com/a/h0x40

Cheating:
SRC data files are all in plain text that can be opened in any text editor. Most of the values aren't labelled, although some numerical values should be obvious anyway (such as money). Here are some other areas of interest for cheating

"設定[味方出撃数]" - Maximum Deployment slots in battle.
"設定[味方最大数]" - Maximum total number of units in hangar.
"設定[ロボガチャ回数]" - No. of Gacha rolls

Back up your save files before you edit anything and try not to make the numbers too ridiculous - for example, you will almost never legitly reach the default maximum number of recruited hangar units in a legit playthrough (100) and the engine has to load up all units in memory from the save file even if you don't deploy them, so collecting too many units may cause unbearable load times and instability.

Custom Units:
SRC has support for custom units, although it requires some familiarity with the engine if you desire to create your units entirely from scratch.

A Sample Custom Unit Pack (usable by drag and drop) can be found here:
http://www.mediafire.com/download/dr95fgd7j023gv7/SRC_Custom_Units.rar

Weapon Properties Translation:
SRC units may come with many special properties that you may not see in a regular SRW game. Here's a listing of many "generic" weapon properties you may run into.

Damage calculation:
These properties affects how the damage of the attack is calculated.

格 (Melee) - These attacks derive damage from the melee stat

射 (Ranged) - These attacks derive damage from the range stat

複 (Dual) - These attacks derive damage from the average of both Melee and Range

連 (Continuous) - Continuous attacks roll its hit rates seperately in order to calculate final damage. For example, a 連Lv6 attack with roll hit rate 6 times - if 4 out of these 6 rolls hit, then the final damage will be 4/6 of the total.

散 (Diffusion) - Diffusion attacks work like shotgun-type weapons. When attacking from a range of 3 and above, they gain an increased accuracy rate but decreased power

貫 (Armour Pierce) - This attack deals damage as if the target's Armour is halved.

痛 (Crit Damage) - This attack deals increased damage during critical hits.

Deflect modifiers:
These properties govern interaction with the Auxillery Defenses such as Shoot Down or Cut Away.

突 (Rush) - Represents combat with martial arts and other such fighting techniques. Can be deflected.

武 (Weapon) - Represents combat with weapons such as swords or spears. Can be deflected

接 (Contact) - Special melee techniques that cannot be deflected

実 (Projectile) - This attack uses a projectile to deliver its payload, such as arrows or missiles. Can be deflected.

Attack characteristics:
These properties include elements and other similar aspects which a unit might be vulnerable or resistant to.

Elemental Characteristics:
地 - Earth
水 - Water
火 - Fire
風 - Wind
雷 - Lightning
光 - Light

Others:
銃 (Firearms) - Represents conventional modern firearms such as a Machine Gun or Rifles.

Ｂ (Beam) - Beam weapons tend to have special interaction with certain special abilities (especially of the Gundam series) and tend to be weak when fighting in or against underwater targets

Status Conditions
Weapons with these properties inflict special status conditions on the enemy on a Critical Hit

Ｓ/縛/止 (Shock/Capture/Stop) - These properties stun the enemy, preventing attack and counterattacks for the specified turns

中 (Neutralize) - This attack disables any barriers and Aux defenses of the target when triggered.

即 (Instant Death) - This attack instantly kills the target when triggered

盲 (Blind) - Inflicts blind on the target. Blinded characters take penalties to their Accuracy and Evasion rates

撹 (Disturbance) - Characters that are inflicted with this status have their accuracy halved.

眠 (Sleep) - Target is put to sleep. They will wake when attacked, but take increased damage from the attack.

石 (Stone) - Target is turned to stone. They will take reduced damage but are unable to act.

毒 (Poison) - Target is poisoned. Poisoned characters take 10% of MaxHP in damage every turn

狂 (Berserk) - Berserk characters have increased attack, but decreased defense and will attack uncontrollably.

乱 (Confuse) - Confused characters act randomly, attacking both foes and friends.

魅 (Charm) - Charmed character turn on their former allies.

低攻/防/運 (Debuff Attack/Defense/Mobility) - Reduces the target Attack, Defense or Mobility for the specified amount of turns.

吹/Ｋ (Gust/Knockback) - Knockbacks an enemy for the specified amount of squares + 1. The latter will not affect units that are 2 sizes larger than the attacker, while the former will work on all targets except XL size units.

引 (Pull) - Pulls a target next to you. Cannot be used on XL size units.

Attack Timing Characteristics
These characteristics involve manipulating the battle order or imposes restrictions on when attacks can be used.

Ｐ (Post-Movement) - This attack can be used after moving. (All Range 1 attacks are inherently P)

Ｑ (Non Post-Movement) - This attack cannot be used after moving.

先 (First Strike) - This attack always strikes first.

後 (Last Strike) - This attack always strikes last

攻 (Offense) - This attack can only be used on offense/player phase.

反 (Counter) - This attack can only be used on defense/enemy phase.

再 (Double) - This attack has a (6 * Level)% chance of attacking twice

Ｃ (Charge) - This attack requires the character to Charge using the チャージ command. He may not move or attack while charging.

合 (Combo) - This attack represents a simultaneous attack from multiple characters. They must be within 1 Square range of each other.

MAP Attacks Properties:
MAP Attacks deal damage in an Area of Effect.

Ｍ全 (Self) - Radius of AOE starts from the unit itself and spreads out in a diamond pattern

Ｍ直 (Line) - AOE radius is a straight line

Ｍ線 (Linear) - A line AOE radius that may be adjusted 

Ｍ拡 (Rectange) - A rectangular shaped AOE.

Ｍ扇 (Cone) - Cone-shaped AOE that starts out small and increases as range increases.

Ｍ投 (Cross) - A cross-shaped AOE from the targeted point.

Ｍ移 (Dash) - This attack moves its user to the targeted area while attacking.

Misc:
Misc characteristics

気 (Morale Cost) - This attack costs (level * 10) Morale to use.

共 (Ammo Share) - This attack shares Ammo (弾) with all other attacks sharing the same property and level. They will reduce proportionally when used.

吸 (Drain) - This attack steals HP proportional to damage dealt.

MISC Section:
Interested in playing an English (mostly) SRC Scenario?
Check out the SRW DB at https://ontlogy.wordpress.com/srw-db/ !

Additional Reading Links for SRC related information:
https://ontlogy.wordpress.com/2014/01/14/a-look-at-simulation-rpg-construction-src/
https://ontlogy.wordpress.com/2014/06/08/simulation-rpg-construction-src-scenario-roundup-part-2/