Actually after analysing this more deeply
x = number
y = letter
the oldest set of games released around the same time as the original Gam*Boy, whenever that was. Samsung branding only. We don't have many examples, but all of the above were released on Sega Card at some point, which might be a clue. Maybe mid-80s?
Gam*Boy II-branded games. The "GB" probably stands for G
oy. Sega AND Samsung branding. Late 80s?
GB xxxx JG
I'm guessing these are early 90s covers, redesigned to match the Aladdin Boy (Mega Drive) boxes.
GB xxxx KS
Not sure what KS stands for. Might be battery save. More likely games translated into Korean.
GM xxxx JG
(Super Gam*Boy (first release of the console))
(Super Aladdin Boy (second release of the console))
Mega Drive games, originally Sega-published. The Japanese equivalent is G-xxxx. Oh and other interesting point, Japanese Mega Drive games started at G-4000. These appear to start at GM 4000 JG, though they ramp up significantly - Light Crusader is GM 95004 JG
GM xxxx JT
Originally third-party published games. Japanese equivalent is T-xxxx. Thing is, it doesn't make a whole lot of sense in this context because Samsung published all the JGs and JTs, so it's an odd situation. From our small pool of scans, there are no JTs with Super Gam*Boy branding - only Super Aladdin Boy.
My assumption that JG and JT stand for J
apan "G" and J
apan "T", wheras K is for K
For rough dates - Samsung adopted their current logo in 1993. Sonic tends to appear on post-1991 covers.
GM xxxx KS
Still not sure what KS stands for.
GM xxxx HG
Insector X by Hi-Com.
I went through Guardiana's inaccurate database and generally things seem to conform to those rules. But there are a few exceptions
Time Warner Interactive seem to have gone through "HIC Infocomm". TWI have never really played by the rules though - their Australian releases are North American Genesis games with slap-dash rebranding. Not to mention their roots are Tengen, the same company who published unlicensed stuff for the NES. So not much cause for concern.
According to them there is also a Hi-Com version of Wonder Boy in Monster World (aka Monster World III). That might be a path worth exploring.
EDIT: And a visit to SMS Power
HiCom release with GB xxxx code
This post has been edited by Black Squirrel: 13 March 2012 - 11:31 AM