Revision A3 and B1 had 4.7K pull up resistors which are not adequate when using a lot of or particular add-on boards.
If you are not experiencing any issues you can probably just leave them alone..
A suitable alternative is 2.2K...
https://www.mouser.co.uk/ProductDetail/ ... ApBQ%3D%3D
Packs to change are..
Is possible just changing the databus ones may be enough to solve some issues alone.. So I was suggest just try changing those first few have problems as it may solve them...
H5 A3 & B1 pullup resistor change
H5 A3 & B1 pullup resistor change
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.
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.
Re: H5 A3 & B1 pullup resistor change
Tonight, having started my build, I could have a good look at those resistors, and it's quite tiny, and I feel uneasy to hack them.
On the other hand, we have those marvelous expansion ports, so I was telling myself that leaving alone the existing resistors, and making an extension that add another set of pull-ups resistors (4.7k too) in parallel would achieve an equivalent pull-up of 2.35k. Am I right ?
On the other hand, we have those marvelous expansion ports, so I was telling myself that leaving alone the existing resistors, and making an extension that add another set of pull-ups resistors (4.7k too) in parallel would achieve an equivalent pull-up of 2.35k. Am I right ?
Re: H5 A3 & B1 pullup resistor change
You could hack up a pull up plug in board for a 68K socket.. I was going to do one, but unless people have problems then it could be left alone anyway...sporniket wrote: ↑Tue Feb 02, 2021 11:16 pm Tonight, having started my build, I could have a good look at those resistors, and it's quite tiny, and I feel uneasy to hack them.
On the other hand, we have those marvelous expansion ports, so I was telling myself that leaving alone the existing resistors, and making an extension that add another set of pull-ups resistors (4.7k too) in parallel would achieve an equivalent pull-up of 2.35k. Am I right ?
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.
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.
Re: H5 A3 & B1 pullup resistor change
I guess this would be why my NetUSBee will not work in the cartridge port?
I have tried in all 3 of my B1 boards and been unable to get the USB port to mount as storage. I also have an Exxos IDE board installed.
I have tried in all 3 of my B1 boards and been unable to get the USB port to mount as storage. I also have an Exxos IDE board installed.
Atari Falcon 030 | Atari 1040 STE | Atari 1040 STFM | Atari 1040 STF | Kryoflux & Supercard Pro Flux boards
Creator of the Atari ST Review magazine archive: https://www.chillichai.com/atari-st-review
Creator of the Atari ST Review magazine archive: https://www.chillichai.com/atari-st-review
Re: H5 A3 & B1 pullup resistor change
It could be, but people been moaning about NetUSBee for months, seems it's just inherently buggy.
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.
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.
Re: H5 A3 & B1 pullup resistor change
I had it working on my H4 board, but did note others had issues. If I can find some time, I will see if adding some in-parallel 4.7k pull-ups in an expansion socket changes anything.
Atari Falcon 030 | Atari 1040 STE | Atari 1040 STFM | Atari 1040 STF | Kryoflux & Supercard Pro Flux boards
Creator of the Atari ST Review magazine archive: https://www.chillichai.com/atari-st-review
Creator of the Atari ST Review magazine archive: https://www.chillichai.com/atari-st-review
Re: H5 A3 & B1 pullup resistor change
I guess it depends if you fitted 4.7K or 2.2K on the H4 I guess...
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.
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.
Re: H5 A3 & B1 pullup resistor change
Just checked and, yes, I have 2.2k SIL resistors on my H4 board.
Atari Falcon 030 | Atari 1040 STE | Atari 1040 STFM | Atari 1040 STF | Kryoflux & Supercard Pro Flux boards
Creator of the Atari ST Review magazine archive: https://www.chillichai.com/atari-st-review
Creator of the Atari ST Review magazine archive: https://www.chillichai.com/atari-st-review
- stephen_usher
- Posts: 5580
- Joined: Mon Nov 13, 2017 7:19 pm
- Location: Oxford, UK.
- Contact:
Re: H5 A3 & B1 pullup resistor change
NetUSBee is a finicky beast. Just a slight change in the PSU voltage, or the length of the data lines or if there's an 'r' in the month will stop it working.
e.g. on my 520STe it works fine with the stock PSU but can't be seen at all, even to read the Ethernec ROM, with the Exxos PSU. Swap the PSUs over again and it's happy.
Intro retro computers since before they were retro...
ZX81->Spectrum->Memotech MTX->Sinclair QL->520STM->BBC Micro->TT030->PCs & Sun Workstations.
Added code to the MiNT kernel (still there the last time I checked) + put together MiNTOS.
Collection now with added Macs, Amigas, Suns and Acorns.
ZX81->Spectrum->Memotech MTX->Sinclair QL->520STM->BBC Micro->TT030->PCs & Sun Workstations.
Added code to the MiNT kernel (still there the last time I checked) + put together MiNTOS.
Collection now with added Macs, Amigas, Suns and Acorns.
Re: H5 A3 & B1 pullup resistor change
So I have created a board that will fit in an H5 5v expansion socket to allow me to test adding 4.7K pull-ups in parallel. It includes both data and address lines to allow both to be tested.
Atari Falcon 030 | Atari 1040 STE | Atari 1040 STFM | Atari 1040 STF | Kryoflux & Supercard Pro Flux boards
Creator of the Atari ST Review magazine archive: https://www.chillichai.com/atari-st-review
Creator of the Atari ST Review magazine archive: https://www.chillichai.com/atari-st-review