ALPHA PARTS LIST

All information relating to the Alpha plus all the WIP threads etc.
User avatar
sandord
Posts: 673
Joined: Mon Aug 13, 2018 10:08 pm
Location: The Netherlands
Contact:

Re: ALPHA PARTS LIST

Post by sandord »

exxos wrote: Wed Nov 07, 2018 9:39 pm 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?
User avatar
exxos
Site Admin
Site Admin
Posts: 23488
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
Contact:

Re: ALPHA PARTS LIST

Post by exxos »

sandord wrote: Wed Nov 07, 2018 9:48 pm 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.
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
User avatar
sandord
Posts: 673
Joined: Mon Aug 13, 2018 10:08 pm
Location: The Netherlands
Contact:

Re: ALPHA PARTS LIST

Post by sandord »

exxos wrote: Wed Nov 07, 2018 9:50 pm You need 1K for those.
Thanks.
User avatar
PaulJ
Posts: 1568
Joined: Sun Apr 08, 2018 1:14 am
Location: USA

Re: ALPHA PARTS LIST

Post by PaulJ »

exxos wrote: Wed Nov 07, 2018 9:39 pm 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?
User avatar
exxos
Site Admin
Site Admin
Posts: 23488
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
Contact:

Re: ALPHA PARTS LIST

Post by exxos »

PaulJ wrote: Wed Nov 07, 2018 11:07 pm 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...
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
User avatar
PaulJ
Posts: 1568
Joined: Sun Apr 08, 2018 1:14 am
Location: USA

Re: ALPHA PARTS LIST

Post by PaulJ »

exxos wrote: Wed Nov 07, 2018 11:19 pm 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.
User avatar
exxos
Site Admin
Site Admin
Posts: 23488
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
Contact:

Re: ALPHA PARTS LIST

Post by exxos »

PaulJ wrote: Wed Nov 07, 2018 11:29 pm 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...
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
Post Reply

Return to “ALPHA DEVELOPMENT INFO”