exxos's Atari, Amiga & retro forum

exxos wrote: 07 Nov 2018 21:39 I listed 2.2K as the main ones (address & data bus) , but later changed my mind to 4.7K... I think the 10K one is on the DMA databus pins.

Yeah, you're right about the 10K one.
But there are two 1K ones on the parts list (RP1 and RP7) but I have only 4K7 and 10K ones in my kit... so do I use 4K7 for RP1 and RP7 as well?

sandord wrote: 07 Nov 2018 21:48 But there are two 1K ones on the parts list (RP1 and RP7) but I have only 4K7 and 10K ones in my kit... so do I use 4K7 for RP1 and RP7 as well?

You need 1K for those.

exxos wrote: 07 Nov 2018 21:50 You need 1K for those.

Thanks.

exxos wrote: 07 Nov 2018 21:39 I listed 2.2K as the main ones (address & data bus) , but later changed my mind to 4.7K... I think the 10K one is on the DMA databus pins.

So out of curiosity the article you wrote on the mega accelerator where you have 10k or 4.7k rp's as a problem and need to be changed to 2.2k. Does that stay the same? What caused your change from 2.2k resisters?

PaulJ wrote: 07 Nov 2018 23:07 So out of curiosity the article you wrote on the mega accelerator where you have 10k or 4.7k rp's as a problem and need to be changed to 2.2k. Does that stay the same? What caused your change from 2.2k resisters?

The STF board doesn't suffer from ringing or other issues that other boards do... tests on STFM, STE I tested 4.7K on the STE, and it wasn't 100% stable, so I moved to 2.2K, its what is needed... BUT, I think somewhere around 1.8K the DMA starts to screw up... so 2.2K is a bit "close".

In anycase, the STF board should be a lot easier to drive, CMOS CPU, ROM, not driving "old" power hungry RAM chips.. less ringing problems on signals...

I went with 2.2K as it was "normal" in my mind, but later thought 4.7K should be fine and probably better than 2.2K... So nothing has changed with my thoughts about STFM, STE, BUT my board is different where I changed my thoughts to using 4.7K on there...

exxos wrote: 07 Nov 2018 23:19 I went with 2.2K as it was "normal" in my mind, but later thought 4.7K should be fine and probably better than 2.2K... So nothing has changed with my thoughts about STFM, STE, BUT my board is different where I changed my thoughts to using 4.7K on there...

Sounds good to me. I going to stick with the 2.2's on this board because they are working well and there soldered in.

PaulJ wrote: 07 Nov 2018 23:29 Sounds good to me. I going to stick with the 2.2's on this board because they are working well and there soldered in.

Shouldn't be any difference between 4.7K and 2.2K on my board anyway.. both really need testing out.. cant even remember whats fitted on my board...