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Author Topic: 68030 not running at 25Mhz  (Read 11594 times)

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Offline LurchTopic starter

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68030 not running at 25Mhz
« on: November 03, 2012, 08:42:29 PM »
Ok so the crystal is 25Mhz and the CPU is 25Mhz but sysinfo is reporting 13.4Mhz?

My card -

http://amiga.resource.cx/exp/professional530plus
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Offline BuzzBrain

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Re: 68030 not running at 25Mhz
« Reply #1 on: November 03, 2012, 09:09:52 PM »
I guess it divide the clock with 2. So the crystal may have been swapped. What is the speed on the cpu?
(Text on the top of the cpu)

If you have a 16mhz 030, you need a 30mhz crystal. If a 33mhz 030 use a 66mhz and so on.
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Offline LurchTopic starter

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Re: 68030 not running at 25Mhz
« Reply #2 on: November 03, 2012, 10:01:00 PM »
Quote from: BuzzBrain;713779
I guess it divide the clock with 2. So the crystal may have been swapped. What is the speed on the cpu?
(Text on the top of the cpu)

If you have a 16mhz 030, you need a 30mhz crystal. If a 33mhz 030 use a 66mhz and so on.


CPU is 25Mhz and crystal is 25Mhz. So I have a 68030 40Mhz and a 40Mhz crystal coming if it divides it by two that's a bummer :-)

Have also tried with a 20Mhz 68030 and that to is stuck at 13.4Mhz :-/
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Offline AmmoJammo

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Re: 68030 not running at 25Mhz
« Reply #3 on: November 03, 2012, 10:03:15 PM »
should have tried the 25Mhz CPU with the 40Mhz crystal before replacing the cpu.
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Offline LurchTopic starter

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Re: 68030 not running at 25Mhz
« Reply #4 on: November 03, 2012, 10:04:20 PM »
So will need to source a 80Mhz crystal ? :-(
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Offline LurchTopic starter

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Re: 68030 not running at 25Mhz
« Reply #5 on: November 03, 2012, 10:05:30 PM »
Quote from: AmmoJammo;713784
should have tried the 25Mhz CPU with the 40Mhz crystal before replacing the cpu.


Havent received the 40Mhz stuff yet, still on it's way.
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Offline zipper

Re: 68030 not running at 25Mhz
« Reply #6 on: November 03, 2012, 10:14:18 PM »
Sysinfo mostly does educated guesses about the frequency - you need something more reliable.
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Offline LurchTopic starter

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Re: 68030 not running at 25Mhz
« Reply #7 on: November 03, 2012, 10:24:28 PM »
Quote from: zipper;713787
Sysinfo mostly does educated guesses about the frequency - you need something more reliable.


Looks like sys speed might be the thing to try going by forum posts. Would the result from the speed test in Sysinfo mean anything?

i.e. what would one expect from a 68030 25Mhz?
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Offline zipper

Re: 68030 not running at 25Mhz
« Reply #8 on: November 03, 2012, 10:32:25 PM »
Somewhere a little below 5 Mips I think.
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Offline AmmoJammo

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Re: 68030 not running at 25Mhz
« Reply #9 on: November 03, 2012, 10:57:23 PM »
Quote from: zipper;713789
Somewhere a little below 5 Mips I think.

with no 32bit ram on the accelerator, it'll do ~0.9mips...
edit: actually, it will be even lower than this, most likely score the same as the stock CPU

with SOME 32bit ram, even just 512k, it should be doing ~4.8mips...
http://img211.imageshack.us/img211/8795/20120816182226.jpg
« Last Edit: November 03, 2012, 11:02:25 PM by AmmoJammo »
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Offline AmmoJammo

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Re: 68030 not running at 25Mhz
« Reply #10 on: November 03, 2012, 11:00:25 PM »
Quote from: Lurch;713786
Havent received the 40Mhz stuff yet, still on it's way.

I was suggesting trying a faster crystal as the CPU you already have may run at 40Mhz just fine... mine is currently at 36Mhz ;)
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Offline djnick

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Re: 68030 not running at 25Mhz
« Reply #11 on: November 03, 2012, 11:09:46 PM »
Where you find 030 on 25 mhz? Long time ago I had 030 but on 50mhz. And it felt faster than 040/25 I've bought 2 years after. The only real speed I felt with 060/50...
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Offline LurchTopic starter

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Re: 68030 not running at 25Mhz
« Reply #12 on: November 04, 2012, 12:24:30 AM »
Get 2600 tops with the 4MB onboard. So looks like it's stuck at 13.4Mhz. The screenshot of sysinfo posted is what I was expecting LOL

So some thing isn't working as intended.

Got the 25Mhz with the card :-)

Ah well when I get the new 40Mhz crystal I'll try ticking that in it and see what happens :-)
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Offline LurchTopic starter

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Re: 68030 not running at 25Mhz
« Reply #13 on: November 04, 2012, 01:59:11 AM »
AIBB/sysspeed all state 13 or 14.5Mhz so something weird going on here.

25Mhz Crystal
25Mhz 68030
25Mhz FPU

Maybe something software wise :-/ 68030.library?
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Offline AmmoJammo

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Re: 68030 not running at 25Mhz
« Reply #14 on: November 04, 2012, 02:28:12 AM »
is the crystal thats currently in there around the right way? :p
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