10 July 2018, 11:19 | #581 | |
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10 July 2018, 11:24 | #582 |
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ECS Amiga's (A500+/A600/A3000) support 2MB chip memory out of the box. Only need to add a trapdoor expansion on the A500+ or A600 to get it.
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10 July 2018, 11:27 | #583 |
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Just a little bit off, but is it possible to overclock amiga chip set?
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10 July 2018, 14:04 | #584 | |
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Yes - you don't even need the full ECS chipset for 1mb of chip RAM, just Agnus (8372 or higher) and a small hardware mod on A500 motherboards. You need the full ECS chipset for 2mb of chip RAM.
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10 July 2018, 15:07 | #585 | |
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Quote:
http://eab.abime.net/showthread.php?t=36905 has some more details. (Note that in WinUAE this is only emulated in compatible modes because this kind of address mirroring breaks JIT) |
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23 July 2018, 10:36 | #586 | ||
Code Kitten
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After looking at the schematics again, indeed, even on OCS machines Agnus has access to the expansion data bus (on the rev6 A500 specifically, no idea on the A1000). However, to be more precise. As far as stock machines are concerned, ECS is definitely needed for the chipset to be able to use 1MB of chip RAM. Sure, one can simply upgrade Agnus but not everyone modifies their machines and knowing what to expect from the stock versions is important. This is an interesting point since despite being physically connected to the slow RAM bus, there was no way for Agnus to access the corresponding memory before ECS Agnus was built. This leads me to suspect that the hardware engineers had already planned to expand Agnus to support >512Kb of RAM (or had already done so at the prototype stage) when they designed the A500. Quote:
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23 July 2018, 12:15 | #587 | ||
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04 September 2018, 17:11 | #588 |
CaptainM68K-SPS France
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I have discovered that SF2 use 512 colors. basically, the game open 2 screens of 256 colors.
hint : the plane on guile's stage, indicate Capcom CR 512 for Capcom 512 colors. The megadrive version is CR 64 for 64 colors. |
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