Mega ST and exxos Decoder + dual tos problem

Upgrade or replace the ROM.
User avatar
exxos
Site Admin
Site Admin
Posts: 23499
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
Contact:

Re: Mega ST and exxos Decoder + dual tos problem

Post by exxos »

I would suggest you continuity check from the CPU pins to the ROM socket and make sure there is no broken connections. D0-D15 , A1-A16.
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.
gwinter38
Posts: 13
Joined: Sat Sep 12, 2020 11:36 am

Re: Mega ST and exxos Decoder + dual tos problem

Post by gwinter38 »

@exxos

All pins have a transition between CPU and ROM
User avatar
exxos
Site Admin
Site Admin
Posts: 23499
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
Contact:

Re: Mega ST and exxos Decoder + dual tos problem

Post by exxos »

You should be working then really, you may want to do the bus resistor upgrades in the mandatory fixes section and try again. PSU recap is always a good idea also. Or send it to @Steve to diagnose the problem for you.
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.
gwinter38
Posts: 13
Joined: Sat Sep 12, 2020 11:36 am

Re: Mega ST and exxos Decoder + dual tos problem

Post by gwinter38 »

There is a chance that these problems are being caused by my MS, I have been mod it for years. There was Pak 020 and 030 some VGA and others. survivors. Maybe one of the chips is damaged. I will try to put it in another MST or 520ST. Please tell me if
Your DualTos will be required in the 520ST or if I can burn 2.06 on eprom and put it directly into the ST ( 27c010 with modifications ) ?

J.z
User avatar
exxos
Site Admin
Site Admin
Posts: 23499
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
Contact:

Re: Mega ST and exxos Decoder + dual tos problem

Post by exxos »

Not sure I understand what you are wanting to try and do.. Any ST will run TOS104, but not 206 without decoder.. my MST dualtos pcb wont fit any other machines.. and the ROM is 27c4096...
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.
gwinter38
Posts: 13
Joined: Sat Sep 12, 2020 11:36 am

Re: Mega ST and exxos Decoder + dual tos problem

Post by gwinter38 »

I need to put 2.06 into 520ST with Your decoder . So , probably I will need dualtos pcb for st ?
User avatar
exxos
Site Admin
Site Admin
Posts: 23499
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
Contact:

Re: Mega ST and exxos Decoder + dual tos problem

Post by exxos »

gwinter38 wrote: Sun Sep 13, 2020 9:54 pm I need to put 2.06 into 520ST with Your decoder . So , probably I will need dualtos pcb for st ?
Yes.. but I only sell dualtos pcbs for 70789 style motherboards.
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.
gwinter38
Posts: 13
Joined: Sat Sep 12, 2020 11:36 am

Re: Mega ST and exxos Decoder + dual tos problem

Post by gwinter38 »

It is a pity. I wanted to check in a short ST. So, tomorrow I'll try to do a test with ct'ide, there is 206. If it doesn't work, probably my MST is broken. Thank you for your help :)
User avatar
PhilC
Moderator
Moderator
Posts: 6016
Joined: Fri Mar 23, 2018 8:22 pm

Re: Mega ST and exxos Decoder + dual tos problem

Post by PhilC »

Were you talking about using two 32 to 28 pin eprom adaptors with eproms programmed to tos2.06, if so it should work in the correct socket with the decoder board but you would need to alter the rom jumpers to suit.
If it ain't broke, test it to Destruction.
User avatar
exxos
Site Admin
Site Admin
Posts: 23499
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
Contact:

Re: Mega ST and exxos Decoder + dual tos problem

Post by exxos »

PhilC wrote: Sun Sep 13, 2020 10:12 pm Were you talking about using two 32 to 28 pin eprom adaptors with eproms programmed to tos2.06, if so it should work in the correct socket with the decoder board but you would need to alter the rom jumpers to suit.
I think someone on here made some of those recently but I cannot remember who..
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 “ROM UPGRADES”