STE TOS 1.06/1.62 to TOS 2.06 EPROM UPGRADE

Upgrade or replace the ROM.
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STE TOS 1.06/1.62 to TOS 2.06 EPROM UPGRADE

Post by exxos » Mon Feb 05, 2018 10:24 pm

One of the easier and semi-popular STE upgrades is upgrading the TOS to 2.06. TOS2.06 is the last TOS version for ST/STE computers which include various bug fixes, 1.44 MB disk support (you still need a floppy upgrade kit to use 1.44 floppy's) , memory test. Adds GTP program support (GEM-Takes-Parameters). Greatly enhanced GEM GUI. IDE hard disk booting. Atari logo display at boot-up. Automatic cold boot memory test. Supports higher resolutions.

(Note you cannot upgrade STFM TOS this way, it requires a lot of hacks to get TOS206 working on the STFM)

So far I have seen 2 types of jumper links. First one is where there are 3 resistor looking links, and another type where there are 2 resistor looking links. These are printed as W102, W103, W104, where W103 may be a resistor looking like, or linked on the PCB itself as shown on the image on the right. Depending what TOS you have installed, the links may also be in different combinations or different sized ROM IC.

TOS106.jpg (128.71 KiB) Viewed 2062 times

To fit TOS206 you simply remove the old ROM's IC's then change the jumper links as shown below.

Note that W103 is wired on the PCB itself on my motherboard, so there is no need for a wire link for me. If your PCB is not linked, then you need to link them, a small link of wire is perfectly acceptable, you do not have to use the resistor looking links.

TOS206.jpg (141.79 KiB) Viewed 2062 times

That's it done! Now if all goes well , you should see the Atari logo come up :) TOS2.06 is a lot "nicer" to use on the STE. Though please note upgrading TOS can break some software, but fixes are being done for popular games to be compatible.

There is also my DUAL TOS kit as shown here which gives TOS1.62 & TOS2.06.

TOS206 ROMS can be found below in my store.

Or if you want to burn your own ...
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Re: STE TOS 1.06/1.62 to TOS 2.06 EPROM UPGRADE

Post by stephen_usher » Tue Feb 06, 2018 6:30 pm

I replaced the "resistors" with sets of three posts so that I could use jumpers. This allows an easy swap back to the original configuration without de-soldering/soldering.
Intro retro computers since before they were retro...
ZX81->Spectrum->Memotech MTX->Sinclair QL->520STM->BBC Micro->TT030->PCs & Sun Workstations.
Added code to the MiNT kernel (still there the last time I checked) + put together MiNTOS.
Collection now with added Macs, Amigas, Suns and Acorns.

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Re: STE TOS 1.06/1.62 to TOS 2.06 EPROM UPGRADE

Post by Methanoid » Sat Jun 22, 2019 6:59 pm

Can someone confirm if these are suitable for me to burn TOS onto (2 chip) please?

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Re: STE TOS 1.06/1.62 to TOS 2.06 EPROM UPGRADE

Post by PhilC » Sat Jun 22, 2019 7:03 pm

They look ok to me. I've been using Winbond W27C010 for mine lately, as they are electrically erasable, not UV.
If it ain't broke, test it to Destruction.

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