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Author Topic: 68000 vs 68020 = 1 : 1 ?  (Read 2774 times)

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guest1255

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68000 vs 68020 = 1 : 1 ?
« on: August 16, 2004, 10:50:59 AM »
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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Offline PMC

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Re: 68000 vs 68020 = 1 : 1 ?
« Reply #1 on: August 16, 2004, 10:55:00 AM »
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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Offline Piru

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Re: 68000 vs 68020 = 1 : 1 ?
« Reply #2 on: August 16, 2004, 11:14:27 AM »
@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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Offline Piru

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Re: 68000 vs 68020 = 1 : 1 ?
« Reply #3 on: August 16, 2004, 11:15:11 AM »
@PMC
Quote
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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Offline Karlos

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Re: 68000 vs 68020 = 1 : 1 ?
« Reply #4 on: August 16, 2004, 11:16:28 AM »
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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guest1255

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Re: 68000 vs 68020 = 1 : 1 ?
« Reply #5 on: August 16, 2004, 11:16:58 AM »
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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Offline X-ray

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Re: 68000 vs 68020 = 1 : 1 ?
« Reply #6 on: August 16, 2004, 11:34:21 AM »
The Maths co-processor IS the FPU: 68881
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Offline patrik

Re: 68000 vs 68020 = 1 : 1 ?
« Reply #7 on: August 16, 2004, 11:36:26 AM »
@Apache2k:

On this 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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Offline PMC

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Re: 68000 vs 68020 = 1 : 1 ?
« Reply #8 on: August 16, 2004, 11:37:04 AM »
Quote

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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guest1255

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Re: 68000 vs 68020 = 1 : 1 ?
« Reply #9 on: August 16, 2004, 11:41:08 AM »
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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Offline pjhutch

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Re: 68000 vs 68020 = 1 : 1 ?
« Reply #10 on: August 16, 2004, 12:02:36 PM »
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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Offline Chunder

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Re: 68000 vs 68020 = 1 : 1 ?
« Reply #11 on: August 16, 2004, 02:05:23 PM »
Quote

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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guest1255

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Re: 68000 vs 68020 = 1 : 1 ?
« Reply #12 on: August 16, 2004, 02:26:18 PM »
My system has 8mb memory. I cant put more?
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Offline KimmoK

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Re: 68000 vs 68020 = 1 : 1 ?
« Reply #13 on: August 16, 2004, 02:30:32 PM »
Quote

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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Offline KimmoK

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Re: 68000 vs 68020 = 1 : 1 ?
« Reply #14 on: August 16, 2004, 02:31:46 PM »
Quote

Chunder wrote:
Quote

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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