While one controller port might seem like a step back from the likes of the NES and Master System (which both had two controller ports), it is worth noting that controller ports were still a novelty among early Japanese consoles, as the Famicom and the SG-1000 (Sega's first console), both launched in 1983, featured hardwired controllers instead and only had ports for additional peripherals (although Sega consoles did start having two controller ports as standard from the SG-1000 II and onward). The console only had one controller port as standard, but could support up to five controllers via the Multi Tap (which launched alongside the console).The Arcade Card Pro, for the original CD-ROM 2 System, adds 2MB from the Arcade Card Duo and the 256KB from the Super System Card.The Arcade Card Duo, for the Super CD-ROM 2 and Duo consoles, adds 2MB.The Arcade Card, required for Arcade CD-ROM 2 discs, was released in two versions:.The Super System Card beefs up the 64KB of main memory included in the TurboGrafx-CD to 256KB (included by default on the TurboDuo).SuperGrafx has 32 KB of main, and 128 KB of Video.Games on HuCards could be up to 2.5 MB. 64 KB of main Random Access Memory in the TurboGrafx-CD add-on.8 KB of upgradable main Random Access Memory in the base model.One of the GPUs is a video display controller, while the other is a video color encoder. These GPUs lacked special effects like multiple backgrounds and translucency that competing 16-bit console GPUs were able to do, but they could easily fill the screen with loads of sprites and one background. The actual graphics are generated by two interlocked 16-bit GPUs.It runs at a maximum 7.16Mhz, although games could switch it down to 3.58Mhz or 1.79Mhz most HuCard games run at 3.58Mhz to avoid overheating the system (as the Japanese PC Engine was quite small), though it runs at full speed for CD games. 8-bit Hudson Soft HuC6280 CPU that is based on the MOS Technology 6502.
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