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• CD I EMULATOR MAC SOFTWARE

CD I EMULATOR MAC SOFTWARE

This one I believe is caused by something I mentioned before, the unit doing hardware accelerated rendering of the games rather than rendering in software to a framebuffer. Galaga has a further bug, suggesting it was the least tested game in this collection. This can sometimes even result in the corruption of the saved high score.

When that happens it causes the game to reboot.

Interestingly the Galaga emulation for this unit in MAME seems fragile in other ways as the attract demo does not properly follow the sequence, that could be a timing issue of a core bug, but the exploit to crash the game, which can be reproduced on the original unit by wiggling the joystick to evade capture in the demo, still works. You can crash the emulation of Galaga in the unit by taking control of the ship during the attract mode and causing the game to reset. Either way Galaga is where things start to fall apart in more obvious ways.Įven without delving into the code, one of the easiest proofs of how the games on this unit are emulated is with Galaga. Galaga I think is just cropped, but maybe some sprite positions are altered. That leaves us with Pac-Manwhich is literally just Pac-Man with a built in cheat to start on leveland Galaga. Galaxian actually uses hardware rowscroll on the GPL to scroll the player sprite and the invaders, just as the original used hardware scroll to do the same, it was interesting to see the feature so closely mapped, but in reality it makes sense, as otherwise it would have been necessary to render the tilemap as sprites. Both are worth mentions for the way they use the hardware tho. Galaxian and Xevious are best I can tell cropped. New Rally X is also a horizontal game, so again holds up better. This also reminds me that current MAME versions have what is likely a bug with the left edge of the screen when emulating Bosconian, unless the original hardware actually does the same. Bosconian is a horizontal game in the first place, so fares a bit better, but you have the attract mode taunting you with that diagonal shooting which is simply impossible on the stick this unit has. The ground pattern textures would likely have suffered badly at the hands of squashing, so again the logical choice for this game. Such problems require a solution, this was a compromise.ĭig-Dug also scrolls, which is a little more distracting due to the slower pace of the game, but not game breaking. Scores are rendered at the side, Dig-Dug does the same as the JAKKS units and scrolls the display based on your position but squeezing that Pac-Man maze in requires a more drastic approach, actually squashing the display of the maze, dropping lines so that it fits. The solution varies by game, some, where they can get away with it, do just crop part of the image. The other issue is that the video output of this Plug and Play has to work with CRT televisions, which means the pixel high, vertical screen resolution of Pac-Man and many of these other games does not fit a non-interlace screen mode.Įven if you chop the 5 rows of score etc. The target bitmap in MAME is the same size as the original screeen, every pixel is properly represented.

One of the big reasons for this is MAME is software rendered, it allocated a bitmap, it draws, from the original graphic ROMs, to that bitmap. MAME had been around and emulating Pac-Man and many of those others for almost 15 years by this point, and while the emulation in MAME is always improving, there are certain things it has always got correct, and some of those things this unit falls down on. By you might expect any emulation based Pac-Man unit being put on the market to have perfect emulation of Pac-Man and any other titles included in it. Without modification you cannot move in 8 directions. Xevious, along with Bosconian both highlight one of the major flaws of these Plug and Play units however, they have a 4-way stick. Sound is not yet emulated, but even in silence the volume meter moves, as the test mode demo runs which is curious. The test mode also shows the build date, has a checksum screen, and even runs a demo of one of the included games, Rally-X, with a volume display, presumably used as part of development. The test mode tells us it runs on GPL hardware. This Pac-Man plug and play unit goes by a number of names, and exists in a number of forms.