TOS upgrade for 1040STF

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Papalapa
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TOS upgrade for 1040STF

Post by Papalapa » Thu Jun 03, 2021 6:58 pm

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 361 times
IMG_0460.JPG
IMG_0460.JPG (220.77 KiB) Viewed 361 times

Thank you!

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exxos
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Re: TOS upgrade for 1040STF

Post by exxos » Thu Jun 03, 2021 7:46 pm

https://www.exxoshost.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxoshost.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 ?

Papalapa
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Re: TOS upgrade for 1040STF

Post by Papalapa » Fri Jun 04, 2021 11:33 am

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

Or "downgrade" to 6 chip TOS. https://www.exxoshost.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

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rubber_jonnie
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Re: TOS upgrade for 1040STF

Post by rubber_jonnie » Fri Jun 04, 2021 11:44 am

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

Or "downgrade" to 6 chip TOS. https://www.exxoshost.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 old Atari things:
800XL + Ultimate 1MB, 2x 1010 cassette, 1050 + Happy mod, 65XE (128k +APE Warp) & XC12, SIO2SD, 2600jr, 7800 and Lynx II
Atari 520ST (1Meg), 1040STF long button floppy, 2x 1040 STFMs + Gotek, 2x 4160STE with 32Mhz booster, ROM switcher, Mega ST1, Mega ST4, not to mention various bare ST boards for testing including a PAK 68/2 :)
Plus the rest..
Amiga stuff, Mac stuff, Sinclair stuff etc...
www.electronicnothingness.co.uk

Papalapa
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Re: TOS upgrade for 1040STF

Post by Papalapa » Fri Jun 04, 2021 11:53 am

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 317 times

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rubber_jonnie
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Re: TOS upgrade for 1040STF

Post by rubber_jonnie » 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.
Collector of old Atari things:
800XL + Ultimate 1MB, 2x 1010 cassette, 1050 + Happy mod, 65XE (128k +APE Warp) & XC12, SIO2SD, 2600jr, 7800 and Lynx II
Atari 520ST (1Meg), 1040STF long button floppy, 2x 1040 STFMs + Gotek, 2x 4160STE with 32Mhz booster, ROM switcher, Mega ST1, Mega ST4, not to mention various bare ST boards for testing including a PAK 68/2 :)
Plus the rest..
Amiga stuff, Mac stuff, Sinclair stuff etc...
www.electronicnothingness.co.uk

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

Re: TOS upgrade for 1040STF

Post by Papalapa » Fri Jun 04, 2021 12:16 pm

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 309 times

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rubber_jonnie
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Re: TOS upgrade for 1040STF

Post by rubber_jonnie » Fri Jun 04, 2021 12:53 pm

Pretty sure you're good to go then.
Collector of old Atari things:
800XL + Ultimate 1MB, 2x 1010 cassette, 1050 + Happy mod, 65XE (128k +APE Warp) & XC12, SIO2SD, 2600jr, 7800 and Lynx II
Atari 520ST (1Meg), 1040STF long button floppy, 2x 1040 STFMs + Gotek, 2x 4160STE with 32Mhz booster, ROM switcher, Mega ST1, Mega ST4, not to mention various bare ST boards for testing including a PAK 68/2 :)
Plus the rest..
Amiga stuff, Mac stuff, Sinclair stuff etc...
www.electronicnothingness.co.uk

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

Re: TOS upgrade for 1040STF

Post by Papalapa » Sat Jun 05, 2021 12:10 pm

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

Or "downgrade" to 6 chip TOS. https://www.exxoshost.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

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rubber_jonnie
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Re: TOS upgrade for 1040STF

Post by rubber_jonnie » Sat Jun 05, 2021 12:12 pm

You're welcome.
Collector of old Atari things:
800XL + Ultimate 1MB, 2x 1010 cassette, 1050 + Happy mod, 65XE (128k +APE Warp) & XC12, SIO2SD, 2600jr, 7800 and Lynx II
Atari 520ST (1Meg), 1040STF long button floppy, 2x 1040 STFMs + Gotek, 2x 4160STE with 32Mhz booster, ROM switcher, Mega ST1, Mega ST4, not to mention various bare ST boards for testing including a PAK 68/2 :)
Plus the rest..
Amiga stuff, Mac stuff, Sinclair stuff etc...
www.electronicnothingness.co.uk

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