Have also also tried what I said in this post ?
https://www.exxosforum.co.uk/forum/viewt ... =10#p17474
STe booster v 1.5 36Mhz
Re: STe booster v 1.5 36Mhz
yes i tested alls, ACSI test software on 8Mhz OK on boosted KO. I tried old SIMM RAM 2x256KB with 8xdil chip - still the same. Blitter chip on off no effect. Only PSU no tested, only with voltmetr 5.06V.
Re: STe booster v 1.5 36Mhz
What was the result for removing the CE wire ?
Re: STe booster v 1.5 36Mhz
nothing happens, still the same
Re: STe booster v 1.5 36Mhz
What is the value of P100 resistor pack at the front of the motherboard ?
Re: STe booster v 1.5 36Mhz
The only other issue I know is a fault I found on the STFM a few days ago. Where A1 had some issue when running with the booster. So you could try a 390pF capacitor on A1 on the DMA chip to see if that helps. If that fails, then I'm afraid you will have to find a different motherboard. The ones with external blitters seems to have less issues than the integrated boards.
I do not think there is anything else to actually try.. I suggested all the faults I know of. But as said before, the booster itself does not really have anything to do with the DMA circuit. But these DMA related problems are very difficult to track down.
I do not think there is anything else to actually try.. I suggested all the faults I know of. But as said before, the booster itself does not really have anything to do with the DMA circuit. But these DMA related problems are very difficult to track down.
Re: STe booster v 1.5 36Mhz
A1? Pin 1 on DMA chip?
Re: STe booster v 1.5 36Mhz
A1 is pin 2 on the DMA. Connect 390pF capacitor (220pF should be OK also) from pin 2 on the DMA to 0V.