16MHZ OPTIONAL FIX
I noticed the MMU 16MHz line isn't actually buffered via the 74F04.. Which was actually part of its intention.. I am classing this as a optional fix as it should not affect anything much..
The fix is simple, lift the yellow end leg of R910 , connect a small wire from the now lifted side, and connect the other end of the wire to pin 10 of the 74F04 (IC900) as circled in red.
ALPHA MODIFICATIONS
Re: ALPHA MODIFICATIONS
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.
- TheNameOfTheGame
- Posts: 164
- Joined: Tue Dec 05, 2017 5:49 pm
- Location: Almost Heaven, West Virginia
Re: ALPHA MODIFICATIONS
I know there are several fixes documented here, but for a 1 man job, you have done great!
I can imagine engineers at Atari Corp going through all this revision testing lol. Here you are doing it all with just a few brave volunteers.
Great props to you and all the testers.
I can imagine engineers at Atari Corp going through all this revision testing lol. Here you are doing it all with just a few brave volunteers.
Great props to you and all the testers.
Re: ALPHA MODIFICATIONS
GLUE DATALINE FIX
A "good" mistake here.. While GLUE states D0 & D1 on the GLUE itself, the actual data lines are D8 & D9! So nothing will be setup right internally on the GLUE and pretty much everything it controls will be "wrong" because it will be getting bad data. The fixes are thankfully not too bad...
STEP 1
Cut D0 & D1 tracks on the bottom of the PCB as highlighted with the redline.
STEP 2
Cut the track on the top of the PCB as highlighted with the red line.
STEP 3
Connect a bodge wire from the glue to the resistor pack as highlighted the redline.
STEP 4
Connect a bodge wire from the CPU to the resistor pack as highlighted the redline.
STEP 5
Connect a bodge wire from the glue to the resistor pack as highlighted the redline.
Done
What we basically have done is rewired the GLUE's D0 to D8, and D1 to D9.
Hopefully this will solve a great number of issues
Thanks for playing Atari
A "good" mistake here.. While GLUE states D0 & D1 on the GLUE itself, the actual data lines are D8 & D9! So nothing will be setup right internally on the GLUE and pretty much everything it controls will be "wrong" because it will be getting bad data. The fixes are thankfully not too bad...
STEP 1
Cut D0 & D1 tracks on the bottom of the PCB as highlighted with the redline.
STEP 2
Cut the track on the top of the PCB as highlighted with the red line.
STEP 3
Connect a bodge wire from the glue to the resistor pack as highlighted the redline.
STEP 4
Connect a bodge wire from the CPU to the resistor pack as highlighted the redline.
STEP 5
Connect a bodge wire from the glue to the resistor pack as highlighted the redline.
Done
What we basically have done is rewired the GLUE's D0 to D8, and D1 to D9.
Hopefully this will solve a great number of issues
Thanks for playing Atari
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: ALPHA MODIFICATIONS
MFP FIX
Fixes missing pull up resistor on MFP pin 32 (IRQ).
Solder a 1K resistor on the bottom of the PCB connected between the highlighted yellow circles.
Fixes missing pull up resistor on MFP pin 32 (IRQ).
Solder a 1K resistor on the bottom of the PCB connected between the highlighted yellow circles.
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: ALPHA MODIFICATIONS
GLUE DATALINE FIX - Patch in place on board. Also shows the pull up fix as well.
Re: ALPHA MODIFICATIONS
RAM RW FIX
Fixes wrong RW line connected to RAM.
STEP 1
Cut track on top of PCB as shown below.
STEP 2
Bodge wire connected as shown below in red.
STEP 3
Pray to whichever god you believe in, or do a ritual chicken sacrifice and voodoo dance.. or do both to be sure... (uploading such events to youtube is also recommended).
Fixes wrong RW line connected to RAM.
STEP 1
Cut track on top of PCB as shown below.
STEP 2
Bodge wire connected as shown below in red.
STEP 3
Pray to whichever god you believe in, or do a ritual chicken sacrifice and voodoo dance.. or do both to be sure... (uploading such events to youtube is also recommended).
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: ALPHA MODIFICATIONS
LMAO at chicken sacrifice. I take it with the MMU ram board I won't need to do this? probably still do it anyway?
If it ain't broke, test it to Destruction.
Re: ALPHA MODIFICATIONS
That's a point, it shouldn't affect a plug in MMU RAM board...Forgottenmyname wrote: ↑Tue Sep 25, 2018 5:49 pm LMAO at chicken sacrifice. I take it with the MMU ram board I won't need to do this? probably still do it 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.
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: ALPHA MODIFICATIONS
But I am getting corruption that I didn't have when I just had the E7 error repeating.
I'll do the patch anyway, for continuity but I think we might need to look somewhere else too.
I'll do the patch anyway, for continuity but I think we might need to look somewhere else too.
If it ain't broke, test it to Destruction.