CPS2 rom layout: Difference between revisions
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The eproms of each chunk are interleaved, so while the GFX eproms may be of different size, they are always the same size within each chunk. Some games only use one chunk, either the higher or lower. | The eproms of each chunk are interleaved, so while the GFX eproms may be of different size, they are always the same size within each chunk. Some games only use one chunk, either the higher or lower. Because the way the interleaving works, you need 4 physical eproms for each chunk. | ||
Revision as of 12:16, 23 September 2012
Graphics Layout
all this information is to-be-confirmed..
CPS2 has, depending on PAL, up to 32mb of graphics. When using eproms, this space is split into two chunks. The lower chunk, and the higher chunk.
- Lower chunk consists of eproms 13,15,17,19
- Higher chunk consists of eproms 14,16,18,20
The eproms of each chunk are interleaved, so while the GFX eproms may be of different size, they are always the same size within each chunk. Some games only use one chunk, either the higher or lower. Because the way the interleaving works, you need 4 physical eproms for each chunk.
- When using F and G PAL, the split is at 16mb (half of 32mb)
- When using B pal, the split is at 8mb (half of 16mb)
- PAL D & E is not known
