About 600kb were a main/shared/common part, and if I'm not mistaken 100kb or a bit more were swapped (the overlay). Game used overlays for the executable part. We were never given their internal sound mixer, but the popular metal gear tune was "mod"-like with very short samples - all of this + game effects was fitting in a 512kb audio buffer (adpcm). If models were skinned they would've required all the colors used anywhere on the body, and would produce other unpleasant effects (different sampling frequency, especially on the shoulders, etc.) Konami's character modeling is top-notch. As such it was possible to use very little colors per texture (16) and use palettes (which is a very small "texture" in the graphics memory). Some textures were covering only the front part of the body, others arms, etc. Models were not "skinned" as it was popular in the day. I worked on the port of MGS to PC back in 1999-2000.
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