exxos wrote: ↑Sun Nov 11, 2018 10:11 pm
What capacitor value do you have in at the moment 22uf ? and 1K ?
I think the problem is the switch isn't discharging the capacitor fast enough... even when it is, the reset pulse low is just to short...
Try something like 100nF and 470K any higher values on either and it will malfunction (according to simulation anyway)
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.
Icky wrote: ↑Sun Nov 11, 2018 11:45 pm
Hmm - with 100nF and 470K white screen and no boot. Reset button stays on white screen no boot or flicker of reset.
Damn... Try 47k..
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.
Icky wrote: ↑Sun Nov 11, 2018 11:45 pm
Hmm - with 100nF and 470K white screen and no boot. Reset button stays on white screen no boot or flicker of reset.
Damn... Try 47k..
Its a crazy one this one trying to find the right combination.
This is going to be the last one tonight. Am all reset out today. Didn't get anywhere near my recap task today.
Aye, doesn't seem like its going to behave wonder if the 555 circuit could be rejigged to give a inverted output
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.
exxos wrote: ↑Mon Nov 12, 2018 12:03 am
Aye, doesn't seem like its going to behave wonder if the 555 circuit could be rejigged to give a inverted output
Yep 47K made no difference still white screen
Definitely feel like with this circuit. I tried out so many combinations today.
I will have a look for a better reset chip tomorrow.. There are things like the LP3470 , must be some chip out there which has a good drive current so can do away with the LS05 all together..
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.
exxos wrote: ↑Mon Nov 12, 2018 12:16 am
I will have a look for a better reset chip tomorrow.. There are things like the LP3470 , must be some chip out there which has a good drive current so can do away with the LS05 all together..
That would be great if that is the case. The less chips the better.
I guess a small MOSFET could be used to beaf it up.. Still smaller than a TTL chip..
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.