68030 not running at 25Mhz

[Lurch]

Must have more power :-)

[Lurch]

It has a 68882, if that's the case I'll see if I can track down a 60Mhz crystal. An extra 10Mhz would be great.

Seems weird that it should halve the speed for the CPU and not that the FPU. Have checked the board a couple of times and I can't see where you can set the FPU to be seperate from the CPU :-/

Craziness TBH.

[Lurch]

Went to the mailbox nothing there :-( Today today... come on :-)

Was looking at another accelerator a derringer through google and it has the similar setup of halving the speed.

Might get a 80Mhz and drop it in should get 40Mhz... hmmm...

[Lurch]

Will get those photos done tonight of the VXL-30 :-)

[Lurch]

So put the 40Mhz crystal in and CPU and the grand total came to 13.4Mhz :-) LOL

Back to the drawing board.

[Lurch]

Yep

40Mhz Crystal + 40Mhz CPU = 13.4Mhz
40Mhz Crystal + 20Mhz CPU = 13.4Mhz
40Mhz Crystal + 25Mhz CPU = 13.4Mhz

LOL

Jumpers are set to the following

JP1 OFF = 68030

JP2 ON
JP3 OFF
JP4 ON = 4MB load high

JP5 OFF =  Cache on
JP6 OFF = MMU on

Jumper SP1 unsure what that does, if I move it to 1-2 Amiga wont boot 2-3 it does.

Can't see anything else on the board I can change. So busy translating the manual at the moment.

[Lurch]

Hmm, will give it a shot. :-)

[Lurch]

Would love to remove the 68k but it's soldered to the board, a shame as I wanted to have the 68010 as a fall back.

Removing the FPU didn't help, so will try and take a nice photo for you. Although my camera is not the best :-)

[Lurch]

http://farm9.staticflickr.com/8066/8159903124_d67e6d9976_k.jpg

Hopefully the link will work. :-)

[Lurch]

RAM is configured, I have used the addmem command and also used the install disk which puts a script in wbstartup :-)


A thought I've had is it's not seeing the crystal on the card.

You can turn burst mode on even if you don't have any fast ram.

The 68030 on this card always runs at 28.5 Mhz. The crystal is for the FPU only.

Would be happy with 28.5Mhz but its 13.4Mhz :-) Whats the secret in getting the CPU to run at full speed?

[Lurch]

Benchmarks as a 13.4Mhz CPU not at 25Mhz or higher. Sysinfo/Sysspeed/AIBB all the same.

Going by Mongo the Crystal is for the FPU and the CPU should be running at 28.5 Mhz.

So tonight when I get home will see what happens when I remove the Crystal and FPU from the board :-)

is it set by the original crystal on the motherboard?

If that's the case then 13.4Mhz is about right 2 x 7Mhz?

[Lurch]

Will give it a shot Choaslord, only thing I can't try is using a Commodore Genlock. Not a piece of kit I own :-/

More to come :-)