Amiga.org

Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: gertsy on July 06, 2009, 03:25:01 PM

Title: GVP G-Force Combo 040 CPU Fallback
Post by: gertsy on July 06, 2009, 03:25:01 PM

Hi, i am trying to find out if there is a CPU disable/fallback jumper on my Rev 6.04 GVP G-Force 040 Combo card.  I was thinking the GVPCPUCtrl tool was doing the trick but have found it isn't.  The GVP readme says this tool saves you from having to manually switch the card. Which eludes to a jumper. But all the doco I can find BBOAH/AHD doesn't mention a jumper.
I already have a toggle switch on the front of my A2000 from its GVP 030 Combo days, waiting for a spot to plug into....
Anyone with a manual out there who can help me.?

Cheers.

Gertsy.

Title: Re: GVP G-Force Combo 040 CPU Fallback
Post by: save2600 on July 06, 2009, 03:35:32 PM

Jumper 23 is the fallback mode switch for the A3000 version of this accelerator. Perhaps it's the same for
the A2000 fast slot version? If not, doesn't look like that card has a 68k fall back mode...

Title: Re: GVP G-Force Combo 040 CPU Fallback
Post by: gertsy on July 06, 2009, 04:13:42 PM

@save2600 : no Jumper 23 on board.  Cheers.

BTW: I don't think Penguins have belly buttons. Do they?  But then again, like the media, don't let the facts get in the way of a good story.

Title: Re: GVP G-Force Combo 040 CPU Fallback
Post by: gertsy on July 07, 2009, 08:29:39 AM

If reply_timeout

No one has a GVP G-Force 040 Manual ?

Title: Re: GVP G-Force Combo 040 CPU Fallback
Post by: Fats on July 07, 2009, 02:05:32 PM

Quote from: gertsy;514788

If reply_timeout

No one has a GVP G-Force 040 Manual ?

I have, and the only way mentioned in the manual to boot into 68000 compatibility mode is through the GVPCpuCtrl program namely 'GVPCpuCtrl  BOOT68000'.

greets,
Staf.

Title: Re: GVP G-Force Combo 040 CPU Fallback
Post by: gertsy on July 21, 2009, 11:36:41 AM

Yep. Ive been doing that. For some games it seems to be fine for others though they run too fast.

Cheers

Title: Re: GVP G-Force Combo 040 CPU Fallback
Post by: save2600 on July 21, 2009, 02:52:39 PM

Quote from: gertsy;516371

Yep. Ive been doing that. For some games it seems to be fine for others though they run too fast.

Cheers

You could always try running Degrader or TUDE to slow things down:

http://aminet.net/package/util/misc/Degrader

http://aminet.net/package/util/misc/TUDE

Title: Re: GVP G-Force Combo 040 CPU Fallback
Post by: gertsy on July 26, 2009, 09:19:04 AM

Thanks save2600, I have downloaded degrader and will give it a go.

Title: Re: GVP G-Force Combo 040 CPU Fallback
Post by: magnetic on September 14, 2010, 12:54:28 AM

Hi. I'm trying to put my a2000 jumpers back to the original state after removing the Combo 040 board. Can someone with the manual please tell me what the original jumper setting are for the a2000.

Title: Re: GVP G-Force Combo 040 CPU Fallback
Post by: rkauer on September 14, 2010, 06:44:40 AM

Don't know if it is valid for the 040, but using the 030 version all you need to do is hold the right mouse button.

Title: Re: GVP G-Force Combo 040 CPU Fallback
Post by: gertsy on September 14, 2010, 12:13:15 PM

Quote from: rkauer;579187

Don't know if it is valid for the 040, but using the 030 version all you need to do is hold the right mouse button.

Well I'll be.  Works a treat.  ! !
Salutations and felicitations.  Well done! most helpful!
Loopz is now eminently playable..

BTW: What's RL ?  RL syndrome?

Title: Re: GVP G-Force Combo 040 CPU Fallback
Post by: gertsy on September 14, 2010, 12:22:09 PM

@magnetic here are the A2000 jumper settings.


These setting come out of the manual for an Amiga 2000 Revision 4.x and is compliant with Rev 6.x Amiga 2000 boards as well.


J101 This jumper determines the high order address bit for Fat Agnus. In it's normal position, the high-order bit is A23; in it's other position, this bit is A19. The current Fat Agnus chip requires the A23 signal for proper management of the memory at $C00000. Future Fat Agnus chips may do things differently; this keeps the current board compatible with simple enhancements.
J102 This jumper if available configures the A2000 for NTSC, or PAL operation. Agnus 8370, 8372A, 8372AB for example, support switching between NTSC and PAL. Rev 6.4 motherboards and possibly later revisions come with an 8375 Agnus by default which does not support switching. It was made in in separate versions for PAL and NTSC
J200 This jumper determines the time base used for the 50/60Hz CIA timer chip. In the normal posistion, the 50/60 TICK clock, based on AC line frequency, is used as a time base. In the alternate position, the verticle sync pulse from the video section is used. The system will not operate properly without one of these clocks.
J301 This jumper is closed to add a second internal floppy drive, open to leave the second floppy out of the main unit box. The Amiga expects an ID bit stream from each floppy drive; this lets it determine the drive type. External floppies have this ID circuitry on board, but as it's not an industry standard capability, it has to be implemented on the A2000 motherboard to save cost on internal drives. Leaving the jumper open prevents the Amiga from seeing the ID sequence.
J500 This jumper is used to enable the 512k of RAM at $C00000 and the real-time clock. It is normally closed; opening it will disable both this extra RAM and the real-time clock.

There is no jumper specifically for a processor card.  just slot it in.. or take it out.   WB might freak though trying to use the 040 libs but maybe not?

Title: Re: GVP G-Force Combo 040 CPU Fallback
Post by: psodas on August 22, 2011, 10:26:11 AM

@gertsy
 
 
http://www.amibay.com/showthread.php?t=18953:)