HuCard

The HuCard is an evolution from an earlier Hudson Soft technology, the Bee Card, which it developed in the early 1980s as a distribution medium for MSX software; In July 1985, Hudson Soft approached and pitched Nintendo a new add-on for the Famicom that played games using their patented Bee Cards, which was experimented on the MSX computer.

However, as the technology for it was expensive, and that they would have to pay royalties for each card sold, Nintendo instead decided to pass on Hudson Soft's proposal.

Most video game cartridges have a large plastic housing to protect the PCB while providing enough space inside for radiant heat and, less often, a button cell.

The PCB in a HuCard or Bee Card is protected by a rigid, glossy polymer that conducts heat; since the PC Engine and TurboGrafx-16 leave one side of the card partially exposed while inserted in the console, heat disperses with less obstruction.

[3] Hudson Soft, NEC, and other vendors published seven HuCard games specifically for the PC Engine SuperGrafx.