The TF536 REV5 ST EDITION is a exxos port of the popular TF536 Amiga accelerator by Terriblefire which offers 50Mhz 030 CPU with 64MB fast-ram and IDE.

The firmware & hardware has been extensively revised to better suit the Atari ST range of computers. The PCB has been revised in various places to include more parts on the bottom so that they can be supplied preassembled. It's most prominent new feature is the on-board DUALTOS ROM where the decoding is built into the PLD. You can for example have TOS206 and EMUTOS in ROM without requiring a separate dual TOS board. There have been other tweaks for better compatibility with the Atari machines such as fixing the IDE port to use a standard cable.

NOTE: While the original TF536r2 has a Atari firmware developed by agranlund, it is not a active project. Do not confused the ST version of the TF536 (now called ST536 REV5) with the original TF536r2. The hardware and firmware are not compatible or exchangeable!

Please see the forum for all related development progress. https://www.exxosforum.co.uk/forum/viewtopic.php?f=94&t=3992

Some scores are slower due to ST-RAM caches being enabled (less cache hits for alt-ram). Software running in ST-RAM should benifit from the ST-RAM caches being enabled.

TF536 rev1 & rev2 are the initial terrible fire release boards which are not part of the ST EDITION series. At the time of typing the REV2 boards are on still on sale in the store.

TF536 ST EDITION REV3 is the initial release of the ST only version of the TF536 board which is the one as illustrated in the top of the page and requires the pull-up resistor of 1K shown on the image. The IDE port is not functional on this revision. This board has been developed on the H4 motherboard and should also work fine on the H5. It is currently un-tested on the original ST motherboards which will at least need all the mandatory fixes doing.

ST536 ST EDITION REV5 - IDE port fixed. IDE autoboot no longer needs ASCI cable. Final release. Current news is posted on the forum

NOTE: The TF536 by Terriblefire is for the Amiga. Exxos took over the TF536 project to bring a proper ST edition build to Atari computers. This is called the ST536. While there are TF536 ports used on the ST, that project and firmware is not by me and not supported and has many unresolved issues. The ST536r5 is the final build (by exxos) which fixes all the issues with firmware and software. There is no TF536 support for the ST for some years now and considered obsolete. The ST536r5 is the final build by exxos.

LATEST FIRMWARE

REV5_ST526_SLOW_ROM V2 September 19 2022, FIRMWARE & MAPROM

EXPERIMENTAL FIRMWARE - Cache experimentation firmware- untested. 13 December 2022

ST536 TOS206 v2 - March 5, 2023 - Exxos patched TOS206 for the ST536 only - Alpha V2 release. TTram fix. Untested- All languages.

OLD / OBSOLETE FIRMWARE:

REV5 ST536 April 25, 2022 - Offical final release.

ST536 TOS206 May 16, 2022 - Exxos patched TOS206 for the ST536 only. Alpha release.

REV5_ST526_SLOW_ROM September 15, 2022 - Will alow 120ns ROM to be used. Also fixed a small blitter busgrant issue on original machines. Caches enabled in firmware.

REV5 ST536v2_IDE_AB April 19, 2022 - IDE autoboot

REV5 ST536Av2 April 15, 2022 - IDE Enabled

REV5 ST536r5A2 - 07/04/2022 - ALPHAv2 - No IDE & blitter- Clock switching - Only 50MHz on alt-ram (same as original TF536 firmware). Trying to fix HDD issues.

REV 3 & 5 ALPHA FIRMWARE VST2A 288XL (IDE not supported, blitter will malfunction) H4 / STF (288XL no longer supported)

REV 3 & 5 ALPHA FIRMWARE VST2A 144XL (IDE not supported, blitter will malfunction) - STE build

REV 3 & 5 ALPHA FIRMWARE VST2A 144XL (IDE not supported, blitter will malfunction) - H4 / STF

FASTROM - will load the TOS206 image into fastram and reboot and then goto desktop. Includes YAARTTT & PRGFLAGS.

MAPROM 1.8E - Exxos edit, to turn off "copy lower RAM varibles to fast ram" as it would corrupt the floppy contents. Will copy ROM to FAST-RAM. (seems lower than FASTROM?!)

MAPROM SOURCES - Home of MAPROM tools.

Blitter must be removed for EMUTOS. EMUTOS has not been tested with later ST536 builds and may malfunction.

Caches must be off if using original TOS206. Please use ST536 TOS206 and official software on this page instead as it fixes the cache issues in TOS206. Graphics corruption will happen if you're using anything else but the 4K version of MAPROM_C. In particular when using the blitter. BLTFIX must be used if using the blitter.

ST536 TTram test is slower than the PAK030 due to 16bit ROM access. Whereas PAK030 has 32bit ROM. Also 16bit ROM access was slowed to allow slower EPROMs to be used. MAPROM should be used to allow ROM to be copied into TTram for maximum ROM performance. The ST536 ROM is only there to "get you booting".

ASCI wire is no longer required in the latest firmware. It may cause DMA issues if used otherwise.

ST536 TOS startup messages remain in English. Desktop should be in what ever language you chose for your ROM.

PLD - XC95144XL-10TQ144C (10ns)

SDRAM - W9825G6KH-5 (WINBOND) or AS4C16M16SA-6TCN (preffered)

BUFFERS - SN74CB3T3245PW

PGA SOCKET - https://www.exxoshost.co.uk/atari/store2/#0181

REV 3 PCB - https://www.exxoshost.co.uk/atari/store2/#0220

MC68030RC - https://www.exxoshost.co.uk/atari/store2/#0187

TOS206 ROM - https://www.exxoshost.co.uk/atari/store2/#0143

100MHz OSC (rev 3 only) CB3LV-3C-100M0000