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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: guest1255 on August 16, 2004, 10:50:59 AM
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Is it just me or am i missing something.
I had in my A2000 68000, 7.15909 MHz 8mb fast 1mb chip
Now i replaced it to a 68020 20 MHz 8mb fast 1mb chip
I dont see any kind of difference. Is this upgrade something very minor to the system or is it effecting into some other areas that the user cant see?
Sys info. says thats the 68020 is in use.
Apache2k
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Is the '020 complete with an MMU and/or FPU?
You won't notice any difference in speed for programs that rely on the chipset for timing (eg most non-vector based games). You should however notice that the OS is more responsive and that applications run faster (eg DPaint, wordprocessors etc).
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@Apache2k
68020@20 is a lot faster than 68000@7, try running some compute bound (CPU intensive) test, not something that relies on disk I/O or custom chips.
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@PMC
Is the '020 complete with an MMU and/or FPU?
68020 has neither.
Both MMU and FPU are separate chips with 68020. MMU is 68851, FPU is 68881 or 68882.
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I had a plain 7MHz 68000/ECS based A600 with 1MB. My A1200 with 14MHz 68020 4MB fast ram was about 4x faster in general use. However, as PMC points out, applications that rely on custom chip timing won't appear any faster. Most normal applications, however, should be appreciably faster.
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I dont know what MMU or FPU is, but it also has a math. processor..
Found the name of it: Hurricane 500.. does this say anything?
Apache2k
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The Maths co-processor IS the FPU: 68881
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@Apache2k:
On this (http://amiga.resource.cx/exp/search.pl?product=hurricane+500&company=) page you can find some information about the card. You can also download the software for the card on that page. If you arent noticing any difference from the 68000@7.14MHz it might be so that the Hurricane 500 card is running in "68000 fallback mode" which I assume is controlled via the software for the card, so you better check that.
/Patrik
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Apache2k wrote:
I dont know what MMU or FPU is, but it also has a math. processor..
Found the name of it: Hurricane 500.. does this say anything?
Apache2k
As Piru correctly pointed out, the FPU/MMU are supplied as separate units as the Floating Point Unit and Memory Management Unit were only fitted internally to some versions of the 68040 and 060.
Anyway, you have a Math Co-Processor fitted. This should be the 68881 which is dedicated to floating point arithmetic. Any applications that take advantage of floating point maths (eg Lightwave) will use this co-processor.
I'm guessing you're using an A2K system?
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Yes the system is A2000 rev 6.2 and ummmm no i didnt install any software for it.
Thank you all for the quick help..
ps eight DIP sockets for 1 or 4 MB 32 bit RAM says on the hurrican spec. Does this mean it has 4 mb memory on it?
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To get more speed:
1. Add more fast memory. Adding fast ram will always give better speed.
2. Replace general amiga programs with 020 optimised versions.
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pjhutch wrote:
To get more speed:
1. Add more fast memory. Adding fast ram will always give better speed.
Erm, no - once you've got *some* FastRAM, adding more won't speed up the system, assuming that programs don't start to use ChipRAM for stuff that isn't related to the custom chipset functions, of course.
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My system has 8mb memory. I cant put more?
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Apache2k wrote:
My system has 8mb memory. I cant put more?
Is the RAM on the CPU card or on a separate Zorro2 card?
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Chunder wrote:
pjhutch wrote:
To get more speed:
1. Add more fast memory. Adding fast ram will always give better speed.
Erm, no - once you've got *some* FastRAM, adding more won't speed up the system, assuming that programs don't start to use ChipRAM for stuff that isn't related to the custom chipset functions, of course.
True. Unless the initial fast RAM is on the A2000B motherboard or on a zorro2 card.
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Its all on Zorro, when i read the hurricane specs. it says that there can be added some memory, but there is no place where i can stick them :).. Or is there some memory that i cant see on the WB bar. Chip 1 mb other 8 mb says the wb menubar.
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@Apache2k:
If you look at the upper right region of this (http://amiga.resource.cx/photos/photo.pl?id=hurricane500) image you will see 8 identical DIP-memory-chips. That is the Hurricane 500 memory. It can be either eight 256Kx4bit DIP-memories for 1MByte of 32-bit memory or eight 1Mx4bit DIP-memories for 4MByte of 32-bit memory. The memory on the Hurricane 500 has its memory mapped in the 8MByte Zorro2 memory-space, so you will have to remove some Zorro2-memory in order to make the Hurricane 500 memory fit inside the Zorro2 memory-space. I would suggest that you remove 4MByte Zorro2-memory.
It is also not impossible that the Hurricane 500 software is needed to activate the memory.
Also note that you need the 32-bit memory on the Hurricane 500 to work to notice much more than a slight speed-increase compared to the stock 68000@7.14MHz.
/Patrik
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Ok, now this did help alot, cos i have 4+2+2mb memory on zorro, no software installed to the Hurrican. This combination explains why i cant get the power of the Turbo Card.
And this also explains " i think so " why my A2k system fails time by time :))
Huh,, damn this is complex stuff :)
Thanks again.
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Once again,, You all where right.
I did install the software(germany) i got 1 mb extra memory and the SysInfo shows
4.87 x A500
3.71 x A2000B extra ram
0.44 x A2000B GVP A3001
1.29 x A2500 A2620
0.56 x A3000 25MHZ
0.13 x A3000 PP&S 68040
NOW IM VERY HAPPY even it gives GURU error if i plug my Supra 4mb memory. ( 1mb hurricans + 2 mb normal + 4 mb normal supra memory = guru error )
Now the sytem is runing very smooth with 5 mb ( i still remember the 8mb limit)
Thanks for all for helping.