Improved Atari TOS versions available

Which TOS versions are improved

1. TOS 1.04 - latest TOS for ST machines.
2. TOS 1.62 - That's actually latest TOS for STE machines.
3. TOS 2.06 combined with improved 1.04 - what gives advanced Desktop of 2.06 and better compatibility of 1.04 - ST*
4. TOS 2.06 combined with improved 1.62 - what gives advanced Desktop of 2.06 and better compatibility of 1.62 - STE

5. TOS 1.04 and 1.62 with large stackframe support - what means work with CPUs 68010-68030 . Good for some accelerators.

Compatibility with diverse Atari HW:  as visible above. However, all it can work on Atari Mega STE . Even TOS 1.04i . There is added code what inits. extra Mega STE HW if runs on them.
* TOS 2.06 needs little HW logic in ST (so Mega ST) machines - and some people have it already - for instance it goes with some IDE adapters.

his is not some kind of TOS "patch" . Several changes are performed, including serious optimisations of code, lot of it is added. Without reassembling complete code with optimizations + some data packing it just wouldn't fit in 192 KB ROM space of Atari ST .
Inevitable legal talk

Why I made it ? I seen some limitations of TOS long time ago. Even had idea how to fix some of them, but that needed lot of time. Got many ideas what is worth to add during years, and some are suggested by Atari people in forums. Base is still original Atari TOS, and RAM requirements of TOS did not increase, compatibility with SW is same as in regular versions.

Main improvements in short:

More efficient work with mass storage - Flash cards, hard disks. Larger partitions (up to 1 GB) and max 30 partitions accessible. And can use even less RAM as TOS type partitions. Added long filename (LFN) filtering in code (it's currently in my hard disk drivers).

Virtual Floppy - much better than Floppy Image Runner (my creation too) - needs less RAM, faster work, possible to use very large pseudo floppy image files .
More and more problems with floppy disks and drives. Who needs them in 2019, when we can do almost everything from mass storage ? Including playing old games.

Logo at startup, followed with short delay, when can perform some settings, integrated boot manager

Saving GEM SW states and quick restore of them

What can order right now ?
UK & US versions with new icons, or with original icons. Doing it with other language TOS versions is possible of course, but it is lot of extra work, so all depend from interest.

TOS 1.04i UK or US OI - original icons - 30 Euros + shipping.
TOS 1.04i UK or US NI - new icons - 30 Euros + shipping.
TOS 1.62i UK or US OI - original icons - 30 Euros + shipping.
TOS 1.62i UK or US NI - new icons - 30 Euros + shipping.
TOS 2.14 UK or US OI - original icons - 30 Euros + shipping.
TOS 2.16 UK or US OI - original icons - 30 Euros + shipping.
All it is tested very thoroughly, I work on this over 1 year.
PayPal payment possible.
All above goes in 2x 1Mbit EPROMs, like 27C010 , 32 pins. Fits directly in STE, Mega STE.

In case of ST, Mega ST, where ROM sockets are with 28 pins can ship in 6x 27C256 - 28 pins. But much better is to use EPROMs 27C512 - their price is practically same, and then can have 2 TOS versions, switchable.

This is with 6x 27C512 . I added short wires to ROM version setting soldering pads. W3 middle pad is here connected not left or right (+5V there), but to GND - and that selects other half of 27C512, so other TOS version. Of course, users need to add there simple switch solution, accessible from outside - 1 switch (must be not alternative) and 1x 1K resistor.

TOS switch is of course possible with 32-pin EPROMs too - like 4 TOS versions with 27C4xx or 29F040 . Please contact me in e-mail for arranging it.
All orders in e-mail too. Please write your HW details, especially mass storage type. Some features need special code for specific adapter - Virtual Floppy, state saves/restores. At moment UltraSatan is most popular by my knowledge. And it is what I can test well.
You will get EPROMs via post. Instructions in e-mail, support in e-mail.
Sending TOS image files is possible too, but that needs talk via e-mail.

Rainbow logo at start:

New Desktop Icons - optional:



Logo at startup, followed with short delay, when can perform some settings:
50/60 Hz refresh rate, disable AUTO run. Switch black and white colors.
Most interesting is environment setting, like with boot managers, just without need to install and bother with them:
When pressing some of keys 1-9 right after logo appears, it will not load AUTO run PRG file(s), DESKTOP.INF and ACCessories from their regular locations (AUTO dir and ROOT of boot partition). but from special directory BT, what must be in ROOT of C partition (works from floppy too, but there is not so useful), and in it can have 9 subdirectories 1-9, in which need to place files what want to be automatically loaded during boot and AES start, res. change.
So, for instance if place  SOME.PRG (for auto run), DESKTOP.INF and SOME.ACC in  BT\3\  - it will activate them when pressing key 3 after logo appears.  With it, very easy to start with desired resident SW, Desktop layout, ACCessories. If nothing is pressed, it will load from usual locations.  Desktop save will go too in proper subdirectory. AUTO run and ACC needs to be copied in proper folder.

Saving GEM SW states and quick restore of them:
Something better than hybernate. May save state of computer, running GEM program by key combination press, practically in any moment (except disk operation periods) . And later can restore that state with key comb. press in couple seconds.
Time depends from RAM amount in machine and disk speed. Of course, only for hard disks, Flash card. Time may be under 1 sec with 512 KB RAM, and about 3-6 secs with 4 MB RAM (stays not for slow Satandisk).
10 diverse states can be saved in 10 slots by holding down left shift+Ctrl and pressing 1-9 or 0. Restore by holding down left shift+Ctrl and pressing F1-F10 .
This will work only with SW what uses TOS functions for peripheral access and other things. And GEM SW is mostly such.
This, and Virtual Floppy must use very low level mass storage access (normal filesystem is not good for), so there is special driver in ROM TOS. And it is for specific adapter - so basic ACSI (Internal  MSTE adapter, old ACSI-SCSI adapters ...), ICD extended ACSI (UltraSatan, better ICD adapters  ...), IDE adapters. May be for some custom adapers too in future.
And that low level driver may serve for regular hard disk driver - then can autoboot it even faster, with very low RAM usage (combined with improved FAT16).

Short demo of state saves and restore:

Here is speed test I made some months ago:

Done on Mega STE, with same UltraSatan, with 2 SD cards with practically same speed.
Test is just copying SUBDIR with 80 very short files to some other SUBDIR on partition.

Regular TOS 2.06 :

Note: it needs min 32 KB for buffers for 500 MB partition.
Almost empty 500 MB partition:
At 8 MHz: 39 sec , at 16 MHz 27 sec

Regular TOS 1.04, 8 MHz for same as above: 38 sec - marginally faster.

Improved TOS 1.04 (without large sectors), DOS FAT16 partition of 1000 MB, almost empty:
No added buffers, only base 2 KB, what TOS creates after boot.

At 8 MHz: 26 sec , at 16 MHz: 17 sec
With 32 KB added buffers:
8 MHz - 25 sec, 16 MHz - 17 sec - marginal improvement, or just in range of test error.

So much for now, features are explained here:
Features, screenshots, YT video link


    PP,   March  2019.