This commercial first back 1990 watching cartoons on TV.
Later on by reading Gamepro magazines and I was on some mailing list with brochures, posters, etc...
Here's my odd experience with the TG-16 and other things I mention:
I ended up getting my TG-16 on X-mas 1991 without asking for it. I really wanted a SNES mostly or even a Genesis that year. The main reason it being a problem for me at the time was due to that I lived on a Navy base in Puerto Rico and my mom got it at Toys R Us in California while visiting my grandmother. Nobody sold TG-16 games anywhere near my location, nor did anyone that I knew owned it on or off the base. I was stuck with Keith's Courage and Final Lap Twin. I also felt robbed X-mas 1989 for getting a Lynx instead of the Genesis, lol. My parents and grandmother could never get it right. I had the same problem, two games and could not buy more games for it. I guess we could have ordered games, but I was a kid and didn't know much about doing that. My parents and I would just keep going to the Navy Exchange and KB Toys off the base to buy regular NES games till '93
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Back to the TG-16. I enjoyed it at first, but then it got old with just two games for a year. Finally an EB games opened in a town summer of '92 just outside the base and I got Cadash. That game almost saved my deprived 16-bit ownership experience. It wasn't until 2000 and then 2006 when I actually started to get back into really enjoy the system. Well, I got a Duo US new from TZD in 2000 with Ys 1+2, Final Zone 2 and a 3-in-1 disc I picked up a few years before in a CD bin at a bargain store. That really helped. Then in 2006 I finally bought a few CD games and 30 HuCards US and JP. Ever since, I would buy a few games here and there that I really want, and I still do.
I really didn't experience the 16-bit age properly till I got a SNES in Spring '94... yeah f$%# 1994. I didn't get a Genesis and Sega CD until 1996 on the cheap, which was a year after I got my PS1 lol. Then a Neo Geo CD Toploader in '97. I went in hard when I got my first job in '97.