25 April 2015, 18:49 | #61 | |
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26 April 2015, 08:53 | #62 | |
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ex: 68060 /50 mhz all caches enabled = 38mips 68060 superscalar cache disabled = ?? to compare: 68040 /40mhz : 30 mips 68040/33 mhz : 25 mips 68040/25 mhz : 18 mips |
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26 April 2015, 15:08 | #63 | |
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But one can split the shifter into a two pipeline stage design and then one could perhaps have a 4ns latency per stage enabling 250MHz. One can't separate the latency of operations and the clock rate - they are expressions of the same thing: frequency=1/latency, latency=1/frequency |
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26 April 2015, 20:55 | #64 | |
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68060 has better instruction timings 68060 has twice the I and D caches 68040 has better branch performance 68040 has bigger instruction fetch (and in some cases better cache performance) If we look at the results from the 68060 daughter board video I linked above, the CPU (integer) performance in the MacOS benchmark is close between the 68040 and 68060 on a per clock basis. The Mac 840AV with 68040@40MHz has a CPU rating of 158 which should be about 198 with a 68040@50MHz. A little less than half the 460 CPU score for the 68060 would outperform the 68040 by a relatively small amount. The better CPU score by the 68060 could be because of faster memory and cache performance of the overclocked 68060 and improved memory performance of the 68060 daughterboard. The 68060 does clearly win in performance vs the 68040 by out clocking the 68040. The FPU performance of the 68060 is substantially better than the 68040. It looks to me like it is at least 75% better at the same clock speed. I don't believe turning superscalar off (I believe FPU instructions still execute in parallel as with the 68040) or the branch cache off (I don't believe the FBcc instruction uses the branch cache) affects the FPU performance. Even a 68060@50MHz looks to me like a nice performance gain over a 68040@40MHz for MacOS emulation. Most 68060 processors will allow 60-65MHz for a substantial performance gain over a 68040@40MHz. The few blessed Amiga users with rev 6 68060 will have more than twice the performance of a 68040@40MHz for MacOS emulation. |
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26 April 2015, 21:57 | #65 |
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That's not the case though. We had the various 060 boards for the Amiga. My PP040-33 smoked all of them in Speedometer testing. It is also faster than the 840AV's benchmarks, even though it is a slower speed CPU. Norton's test is not very thorough, and certainly does not represent all of the various math tests that typical benchmark programs should perform. Snooper, Speedometer, and several others were commonly used for comparison (never Nortons), but Speedometer 4.0 was the defacto standard for benchmark testing.
The Mac OS does cache clearing everywhere, especially in system traps, and clearing caches on an 060 takes far longer than an 040 so there is a big speed penalty from that. I got tired of typing CacheClearU(). I am still very convinced that a good FPGA 040 core is the way to go for compatibility and speed. I created a complete 68040 emulation (CPU, FPU, MMU) for FUSION-PC, my PC version of FUSION. So, I have all of the simulated microcode necessary for a conversion to FPGA. The FPU would have to be created from scratch as I used the x86's FPU in FUSION-PC, but the MMU was part of the software CPU core. I know microcode well, PALs, GALS, PEELs, etc. but unfortunately, I don't know VHDL or Verilog well enough currently to tackle such a project. I am going to take some time to learn the ins and outs completely and see if I can do a full conversion. Last edited by JimDrew; 26 April 2015 at 22:10. |
26 April 2015, 22:07 | #66 | |
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04 May 2015, 07:34 | #67 | |
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the 68040/40mhz is faster than a 68060/50mhz in mac emulation, maybe is faster than a 68060/66mhz (integer performance) but the FPU of the 68060 is about 2.5x of the one in the 68040, mac fpu programs will run faster in the 608060, ie duken nukem 3d ( requires fpu) Last edited by Sandro; 04 May 2015 at 07:39. |
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04 May 2015, 07:38 | #68 | |
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of course your idea of the FPGA 040 is not bad, is better than the 68060 idea, which sucks because the 060 is incompatible with tons of programs |
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07 May 2015, 06:51 | #69 |
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I just read about MIST FPGA and would like to know more about AGA compatibility. Ive seen the Lion King aga YouTube clip. Has there been any more progress on the aga core? How many aga games have been tested and what results are they?
At $199 euro I'd like it to work 100% if I was to buy it. Away from db9 joysticks does any usb joystick work on them? Can we use ps3/360 controllers on it wirelessly? |
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08 May 2015, 02:30 | #71 |
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It would be the reason to buy it as you can get a minimig for ocs/ecs games already.
I would love if someone would showcase more games. Like top 20 AGA games with it on youtube. I've seen Breathless running on it. Yes it does slow down a little on fullscreen shrinking the screen size Speeds it up. Also seen body blows galactic aga shown on youtube. Just need to see more please anyone already with one of these gadgets. |
08 May 2015, 07:13 | #72 |
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08 May 2015, 07:20 | #73 |
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08 May 2015, 07:24 | #74 |
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I haven't tried the FPGA Arcade, so I can't really say. But considering the FPGA Arcade IIRC supports cpu-cards, it can probably achieve higher speeds when emulating AGA machines. When emulating an OCS-machine, I at least prefer it to be represent the A500 speed as close as possible
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08 May 2015, 07:50 | #75 |
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The mist is not upgradable and the fgpa arcade is? Therefore tout can achieve higher cpu settings? Is that correct?
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08 May 2015, 08:05 | #76 |
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08 May 2015, 09:01 | #77 |
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Beware though that the 060 card for it is still semi-mythical, it has been demo'd but you cant buy it yet.
And we all know about aftermarket Amiga boards with expansion headers, they all seem to have a expansion planned for them never released :> So, its the waiting game as usual (-: |
08 May 2015, 09:15 | #78 |
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Would be nice to be seen more AGA games shown on youtube beside the odd 3 or 4 games with the AGA core on either minimig and arcade FPGA
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08 May 2015, 16:50 | #79 |
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I bought the Mist and its a nice little machine. Still would lile to get the fpga arcade when it becomes available perhaps people will experiment with other cpu cards for it also.
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08 May 2015, 23:13 | #80 | |
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Email here laurent@amedia-computer.com They will send information on it first North American members email here sales@cbmstuff.com. |
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