Hardware > CosmosEx, UltraSatan & Co.

Low cost Hard Disk interface compatible with Atari ST/E family computers

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mast-eries:
Low cost Hard Disk interface compatible with Atari ST family computers,
firmware is refined compared to original one;
and tested on a 520ST TOS 1.04, 1040STFM TOS 1.04, 1040STE TOS 1.06, 1040STE TOS 1.62 and 1040STE with TOS 2.06; with ok results.


Results: The unit works perfectly; such example loading the 3.5 MB size of current Metal Slug port takes around 12 seconds (aprox. 650 KB/s read and 400 KB/s write).
Tested against old and modern SD cards, such 1 GB card; 4 GB SDHC and 8 GB SDHC. All these are detected and works correctly!


Operation video,

[video]https://www.youtube.com/watch?v=uRT_0jq9o8w[/video]



A video from the user PSIQ, many thanks!


[video]https://www.youtube.com/watch?v=Qn9IwKo-EoA[/video]




Writing and reading from the hard disk interface:


[video]https://www.youtube.com/watch?v=nERQGIlClAg[/video]



On the last video, a game running from hard disk is shown; with "/" key, a savestate is created. After successful hard disk file writing, the game is closed pressing "*" key, and the STE system returns to desktop. A copy of the generated GS00.TOS file is created, renaming it to GS01.TOS; finally the game is resumed loading the copy of the savestate, GS01.TOS . All these operations are performed correctly.


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There are already built units, at marketplace section!

czietz:
This is an ACSI2STM, right? You say that "firmware is refined compared to original one". Out of curiosity: Where can I find this refined firmware of yours?

mast-eries:

--- Zitat von: czietz am Fr 26.11.2021, 13:48:56 ---This is an ACSI2STM, right? You say that "firmware is refined compared to original one". Out of curiosity: Where can I find this refined firmware of yours?

--- Ende Zitat ---

Its rewritten in ARM assembly and oriented for C6 family instead C8, to avoid read problems when the hard disk goes beyond 500 KB/s, present in ACSI2STM v1
Compiled using commercial ARM Keil compiler

Due to real C8 are not available from months ago, and C8 clones lack hardware features to use second version of ACSI2STM, such timer 4 features, or defective timer 4 implementation, I hace a CKS32 that fails as v2 version


C6 does not have timer 4 at all xD

Signal management is different here. Compatibility is tested against 12 ST machines, 4 years of STE manufacturing (most problematic ones are STEs manufactured from 1993, last ones I supposse), TT, MegaSTE and MegaST

mast-eries:
Can be deleted,

czietz:
So, it's a 100% re-implementation of the firmware? Quite impressive!

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