Porting Metal Slug STE to Sega MegaDrive

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Porting Metal Slug STE to Sega MegaDrive

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MegaDrive at its maximum possibilities:

Image


On screen there is an humonguos amount of animated srpites: A giant Slug, 2 huge tanks, 4 planes, 14 small explosions, 12 player shoots and Sonic

These sprites have the definitive 16 colour palette for sprites

Also, the same music as the STE version is being played, digital samples sounds at 16 KHz; as well all the sound and graphics data that requires 3.6 MB of RAM for the Atari STE, in MegaDrive is taken around 1 MB, without compression.


Obviously, due to MegaDrive video hardware works in chunky mode, the needed pre-shifting of the STE is not needed in this console, reducing the amount of required memory.

In the shown screen, there are 62 hardware sprites out of 79. Without performance penalties, what a brutality!
Game is running in PAL 50 Hz mode.
masteries
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Re: Porting Metal Slug STE to Sega MegaDrive

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A video:


A video:


https://www.youtube.com/watch?v=-hl3hkKaHa8



This Metal Slug port is a conversion from my own Metal Slug port for Atari STE computer
Mainly all the game engine is being ported from Atari STE to MegaDrive / Genesis.


Audio playback is 100% based on digital samples, using a custom made sound driver that provides 3 channels mixed at 16 KHz.
Samples are compressed, in order to save ROM space, and Real-Time decompressed using the Z80 processor.


Currently, the same samples and graphics from the Atari STE version takes only 1 MB of MegaDrive / Genesis ROM space, while the STE version takes 3.6 MB


There is a high detailed background composed of up to 8600 tiles, and a parallax background. Background uses up to 61 different colours. Custom MegaDrive / Genesis tools are made to create map graphics data, and to provide colouring to the map tiles.



Many things are still pending to be ported to MegaDrive / Genesis,
Stay tuned!
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