Most emulation communities operate in a "grey area" where these
The Syscard3.pce file is a ROM dump of the (also known as the Arcade Card Duo/Pro). The PC Engine’s CD add-on did not have a built-in BIOS. Instead, NEC and Hudson Soft sold “System Cards” that plugged into the console’s HuCard slot. These cards contained the BIOS and RAM upgrades necessary to run CD-ROM², Super CD-ROM², and Arcade CD-ROM² games. Pc Engine Bios Syscard3.pce Download