24 October 2022, 17:55 | #1 |
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Emulator that can set exact speeds?
Perhaps a stupid question. Does any of the Amiga emulators have the ability to set a specific Mhz speed? f.x. if i wanted to set it to exactly (or as close as possible) an 030/25 f.x.
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24 October 2022, 20:59 | #2 | |
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Quote:
also you can regulate the speed using the cpu speed slider then you can check on sysinfo at what speed is running etc then you can match the Amiga you want emulate |
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24 October 2022, 21:11 | #3 |
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That makes sense, thanks
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24 October 2022, 21:41 | #4 |
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using cycle_exact you and setting a custom cpu_multiplier you can find more or less exactly speed in integer operations. There is no way to emulate exactly 881/882 at fixed frequencies (16, 33, 40 and 50 Mhz).
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25 October 2022, 00:22 | #5 |
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CPU cycle-exact emulation is only guaranteed for the 68000. Setting an A1200 to be cycle-exact will only be cycle-exact as far as the chipset & chip RAM accesses are concerned.
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25 October 2022, 02:20 | #6 | |
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Quote:
ie if you set in winuae 4x A1200 the emulation will be a bit faster than a real A1200 + fast ram idem if you set 8x will be a bit faster than a real A1200+ TRA1200 turboboard or blizzard 1220 which both run at 28mhz and reports 5 mips on sysinfo also the speed on winuae could be affected by the video filter you are selecting, resolution and x86 speed etc the best way to match the speed of certain Amiga computer +accel is disabling cycle exact and using sysinfo to test the speed of your emulation and regulate it using the cpu slider until you set similar numbers Last edited by Marce; 25 October 2022 at 02:27. |
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25 October 2022, 08:14 | #7 |
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I would love to see a "slow chip" feature to emulate the slow chipmem access that you get when you plug accelerator boards in and code runs in chipmem.
My Phase 5 060 board makes chipmem code run super-slow. |
25 October 2022, 20:04 | #8 |
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That is not that uncommon. If I understand it correctly some Amiga accelerators cheat and don't implement the 68000 bus cycles exactly as described in the 68000 HRM which can have the advantage of being ready early and always meeting the CPU slot for bus access. If you model the bus 100% as described and for whatever reason the accelerator misses it's bus slot then it has to wait.
I believe this is what happens with PiStorm. |
18 December 2022, 20:29 | #9 |
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https://intensecreative.org/2022/11/...or-winuae.html
17 optimized WInuae instalation files |
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