What's in a number?
NGM, NGH and NGCD codes are NOT development codes. Those are publishing/distribution codes. Those are given to complete projects appraching their actual production, not to game in development.
That being said, it's quite natural to think any game never reaching it's FINAL production stage never had a code to begin with.
NO.
I stated back in 2001, that Zupapa (NGM-070) was & is to be regarded as "the Rosetta Stone"
when it comes to unreleased NEOGEO prototypes & their corresponding product code numbers.
FACTS to support this:
To this day, we have discovered 5 of the lost protos and ALL 5 of them were discovered to
have the product codes within the PROPER area on the NGM Product Code List.
(Fun Brothers at 26, Zupapa at 70, Bang Busters at 71, Ghostlop at 228, Bang Bead at 259)
Pictures, Screenshots, Magazine Articles, Promotional Flyers & Literature, and even VIDEOS
mean ABSOLUTELY NOTHING. The ONLY 100% acceptable PROOF of a product code for a game is an
ACTUAL 100% physicaly plugged in cartridge with visual confirmation via the DEBUG or UNIBIOS menu screen.
So, until a genuine documented unreleased proto is found with a "repeated", "non-sequential", or
"missing" product code number, we MUST adhere to this Zupapa standard.
YES.
You are correct that product codes are assigned at ONE point during the life of a game. The only question is
WHEN? Before, during, or after development and/or production? Nobody really knows? Yet.
You are also correct that there may end up being MANY more NEOGEO games at MANY stages of development that were canceled BEFORE they were assigned a product code number. And so it could mean that we are missing MANY more games then just the empty spaces remaining on the list. I have mentioned this many times before as well.
However, for me, personally, those titles do not interest me as much. My primary goal has always been to IDENTIFY the missing numbers, primarily by matching them with unreleased protos as they surface over the years.
(of course, SNK could answer this question in 10 seconds with a simple piece of paper from their records.)
But this has yet to happen. For some reason, this stupid meaningless information is guarded like nuclear missile launch codes. Absolutely RIDICULOUS. Especially when you consider that now the NEOGEO is retired anyway.
So of course, over the years we have been limited to using our best logical speculations to determine the most suitable locations for only the most promising titles. And as discoveries are made, changes are implemented. But regardless of that, mistakes will be made. (that is what happens with guessing)
In the case of "1994 chicago", which became "1995 crystal legacy", which became "1996 breakers", heh well yes this can present quite a confusion! But please remember that we also have evidence of the OPPOSITE.
1991 Dream Over was delayed and became 1992 Mutation Nation...but original NGM# was retained.
1992 Crossed Swords 2 delayed until 1995 (original NGM# retained)
Alpha Mission 2, Sengoku 2, Savage Reign, etc. all delayed an entire year as well.
We don't know yet what causes a product number to be assigned, when it is assigned, or if it can ever be changed and/or re-assigned. But, we do know that every single GENUINE game found so far, has a unique number, in the proper sequence, and NOT repeated. (yet!)