TOS upgrade for 1040STF

News and information about the exxos store. Includes common questions and answers, plus information on new items for sale or items which will be coming off sale soon etc
Papalapa
Posts: 7
Joined: Thu Jun 03, 2021 6:46 pm

TOS upgrade for 1040STF

Post by Papalapa »

I own an Atari 1040SFT in german language and I want to move it to the Spanish (or English) TOS v1.04 language

After browsing the Exxos webshop it seems that there's no kit to do this, because my actual TOS is two-chips only instead of six. I'm wrong or there's a way to install the upgrade that I want ?

Here are two pictures that maybe will help to find a solution:

IMG_0461.jpg
IMG_0461.jpg (213.99 KiB) Viewed 3135 times
IMG_0460.JPG
IMG_0460.JPG (220.77 KiB) Viewed 3135 times

Thank you!
User avatar
exxos
Site Admin
Site Admin
Posts: 23437
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
Contact:

Re: TOS upgrade for 1040STF

Post by exxos »

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.
Papalapa
Posts: 7
Joined: Thu Jun 03, 2021 6:46 pm

Re: TOS upgrade for 1040STF

Post by Papalapa »

exxos wrote: Thu Jun 03, 2021 7:46 pm DUALTOS https://www.exxosforum.co.uk/atari/store2/#0131

Or "downgrade" to 6 chip TOS. https://www.exxosforum.co.uk/atari/store2/#0119
In case that I downgrade to the 6 chips version, do I need to solder something else than the sockets for the TOS chips? It is necessary some additional modification on the board or just add the 4 new chips?

There's no problem with the extra power DC consumption when passing from 2 to 6 chips ?

Thank you
User avatar
rubber_jonnie
Site Admin
Site Admin
Posts: 10385
Joined: Thu Aug 17, 2017 7:40 pm
Location: Essex
Contact:

Re: TOS upgrade for 1040STF

Post by rubber_jonnie »

Papalapa wrote: Fri Jun 04, 2021 11:33 am
exxos wrote: Thu Jun 03, 2021 7:46 pm DUALTOS https://www.exxosforum.co.uk/atari/store2/#0131

Or "downgrade" to 6 chip TOS. https://www.exxosforum.co.uk/atari/store2/#0119
In case that I downgrade to the 6 chips version, do I need to solder something else than the sockets for the TOS chips? It is necessary some additional modification on the board or just add the 4 new chips?

There's no problem with the extra power DC consumption when passing from 2 to 6 chips ?

Thank you
If you 'downgrade' to 6 chips, the machine will run just fine with no power problems. Aside from soldering in the sockets, there are pads near the ROMs marked 1M or 256K, or very similar.

For 2 ROM sets these are set to 1M, so you will need to desolder the pads and solder the 256K pads instead. You may need to also add a 74 series logic chip, I think an LS11, but if you can post a clear picture of the whole motherboard then we can have a look to see if you need it or not.
Collector of many retro things!
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
Papalapa
Posts: 7
Joined: Thu Jun 03, 2021 6:46 pm

Re: TOS upgrade for 1040STF

Post by Papalapa »

rubber_jonnie wrote: Fri Jun 04, 2021 11:44 am If you 'downgrade' to 6 chips, the machine will run just fine with no power problems. Aside from soldering in the sockets, there are pads near the ROMs marked 1M or 256K, or very similar.

For 2 ROM sets these are set to 1M, so you will need to desolder the pads and solder the 256K pads instead. You may need to also add a 74 series logic chip, I think an LS11, but if you can post a clear picture of the whole motherboard then we can have a look to see if you need it or not.
Many thanks for your support, on my first post there are the picture area of the PCB where the TOS is installed and the board revision. Anyway, here's the picture of the whole PCB (hope this image resolution will be enough):

IMG_0459.jpg
IMG_0459.jpg (140.82 KiB) Viewed 3091 times
User avatar
rubber_jonnie
Site Admin
Site Admin
Posts: 10385
Joined: Thu Aug 17, 2017 7:40 pm
Location: Essex
Contact:

Re: TOS upgrade for 1040STF

Post by rubber_jonnie »

Its a bit fuzzy, but I think you're ok, though if you could get a clear shot of the IC immediately below the power connector and to the right of the row of resistors, I think that's it, but I'd like to check.
Collector of many retro things!
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
Papalapa
Posts: 7
Joined: Thu Jun 03, 2021 6:46 pm

Re: TOS upgrade for 1040STF

Post by Papalapa »

rubber_jonnie wrote: Fri Jun 04, 2021 12:01 pm Its a bit fuzzy, but I think you're ok, though if you could get a clear shot of the IC immediately below the power connector and to the right of the row of resistors, I think that's it, but I'd like to check.
Here's it. The IC is the SN74LS11N

IMG_0459.jpg
IMG_0459.jpg (62.6 KiB) Viewed 3083 times
User avatar
rubber_jonnie
Site Admin
Site Admin
Posts: 10385
Joined: Thu Aug 17, 2017 7:40 pm
Location: Essex
Contact:

Re: TOS upgrade for 1040STF

Post by rubber_jonnie »

Pretty sure you're good to go then.
Collector of many retro things!
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
Papalapa
Posts: 7
Joined: Thu Jun 03, 2021 6:46 pm

Re: TOS upgrade for 1040STF

Post by Papalapa »

exxos wrote: Thu Jun 03, 2021 7:46 pm DUALTOS https://www.exxosforum.co.uk/atari/store2/#0131

Or "downgrade" to 6 chip TOS. https://www.exxosforum.co.uk/atari/store2/#0119
Many thanks for the information and also to @rubber_jonnie for the clarifications.

This morning already ordered the Spanish 6 chip set.

Have a nice day :D
User avatar
rubber_jonnie
Site Admin
Site Admin
Posts: 10385
Joined: Thu Aug 17, 2017 7:40 pm
Location: Essex
Contact:

Re: TOS upgrade for 1040STF

Post by rubber_jonnie »

You're welcome.
Collector of many retro things!
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
Post Reply

Return to “EXXOS WEBSTORE INFORMATION”