exxos's Atari, Amiga & retro forum

I have the v1.0 booster installed in my STe. When I run a memory check using the diagnostic cartridge, I get memory failure when running 32Mhz. This happens with both the 4 MB modules I got from from Exxos and the 4MB modules I already owned. Both pass at 8 MHz. When I run the latest version of Gembench, it always bombs when it starts the memory test, both at 8 MHz and 32 MHz. Any ideas?

Thanks,

Have a look at this thread.. https://www.exxosforum.co.uk/forum/viewt ... =20#p41199

What is the difference between an external and internal blitter?

Do you have a chip where the blue arrow is pointing, or do you have pads like in the picture? If you have a chip there, you have an external blitter. If you have pads, you have an internal blitter.

exxos wrote: 19 Jun 2020 22:41 Have a look at this thread.. https://www.exxosforum.co.uk/forum/viewt ... =20#p41199

I took the computer apart so I could see the accelerator board. It is external blitter. I checked the resistor that is soldered in R1. It is already 470R. The capacitor shows 50 on it so I assume it is 50 pf.

Any other ideas?

Ken

exxos wrote: 19 Jun 2020 22:41 Have a look at this thread.. https://www.exxosforum.co.uk/forum/viewt ... =20#p41199

Here is a picture:

You could try the internal blitter mod instead and see if that works. There doesn't seem to be any consistency with the 8MHz clock which makes it difficult to product a "one size fits all" solution. I am beta testing a new firmware to avoid using the 8mhz clock all together for future boards.

Well, I’ve been doing some testing and it looks like my issue isn’t the accelerator. I was running under Peter’s TOS 2.16 and that seems to be the problem. Swapping to 1.62 and I have no problems. I’ll have to keep running under 2.16 and see if I have problems running other programs. If I do I’ll have to put the T0S 1.62/2.06 rom back in place.

Ken

Well I can't say how these odd TOS versions will work. I think someone else a few weeks ago mentioned similar problems. I only use TOS206 for my testing. But also you need 55ns ROM or faster in the dualtos board else you will also have problems.

exxos wrote: 21 Jun 2020 00:14 Well I can't say how these odd TOS versions will work. I think someone else a few weeks ago mentioned similar problems. I only use TOS206 for my testing. But also you need 55ns ROM or faster in the dualtos board else you will also have problems.

I used 50ns roms.

Ken