02 September 2022, 10:55 | #41 |
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@roondar - on-board fast ram would still be tuned to on-board CPU. Once you remove it and get even faster one with turbo that "fast ram" would become PITA to handle (fast fast RAM on turbo, fast ram on board and chip ram on board). IIRC A4k design shows how messy it is. And smarter choice would be dedicated slot for turbo - but that one assumes such expansion capabilities - which were not taken into account on A500 (but it actually has side expansion which can work that way ... that's how ACA works) and absolutely impossible on A600.
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02 September 2022, 13:07 | #42 | |
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02 September 2022, 15:20 | #43 | |
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02 September 2022, 15:54 | #44 | |
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The point I made isn't to say it couldn't have been done, the point is that there's a reason it wasn't. Reading up on things like the AdSpeed shows to me that merely adding a tiny bit of Fast RAM would not have achieved much, if at all for speed, while costing quite a bit to implement in a useful way. IMHO, if you were to redesign the system to be based on Fast RAM, it would've been much better to make all RAM expansions true Fast RAM (perhaps even ditching the trap door RAM entirely or making that Chip RAM expansion space only). Sure, you'd still only get a minor speed boost, but it would have made things much better going forward. |
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03 September 2022, 02:43 | #45 | |
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05 September 2022, 13:02 | #46 |
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The A500 was designed to be as cheap as possible though, and was very long in the tooth when it was still being sold. Having extra logic for handling faster RAM and CPU was deliberately not included, instead the expansion port allowed for such logic to be easily added later on. Want an asynchronous CPU with its own optimised fast RAM? No problem, just add the necessary logic yourself. And there are many examples of expansions that do just that.
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