Please Add a TRM ON and OFF jumper on the future Blue SCSI DB25 V 2024 card

[lucg2]

I have an Atari TT 030. If I use a Desktop Blue SCSI V2 and an external DB 2025 Blue SCSI V2 I must have a TRM jumper on the last Card set to OFF otherwise the inside Desktop Blue SCSI isn't recognized by the Atari.
Please is further DB25 version a TRM jumper like the V 2022 had.
I tested with my Atari TT030 with the old DB 25 V 2022 which was perfect for my use. Unfortunately I broken this precious card....(SD card Slot).
Thank you.
Luc

[erichelgeson]

Hi there - would like to understand this a bit more - BlueSCSI DB25 is meant to be placed (and can really only be placed) at the end of the SCSI chain, which requires termination. What does your entire SCSI chain look like? I suspect there is some odd termination issue happening which is causing this issue, removing termination from the end of the chain doesn't seem like the "right" solution.

You can still build the 2022 version if you wish, the files still exist in github.

[lucg2]

Hello Eric I made different tests with the last 2024 firmware and Atari TT030 BlueSCSI V2 Desktop and BlueSCSI V2 DB25 v2023 coexistence issues : I use BlueSCSI V2 Desktop alone with an Atari TT030 TOS 3.06FR No issues in this case. But if i add a DB25 BlueSCSI for better SD card access and backup possibilities, i have issues. Testing material : BlueSCSI V2 Desktop50 pin revision 2023_10a firmware v2024.04.02 jumper TRM ON PWR ON berg to molex cable with SD card image disk HD10_512 20Mb.hda BlueSCSI V2 DB25 revision 2023.06a firmware v2024.04.02 with image disk HD20_512 20Mb.hda The result : Atari + BlueSCSI V2 Desktop50 alone(SCSI 1.0) – Good Atari + BlueSCSI V2 Desktop50 (SCSI 1.0) + DB25 external Boxed Hard drive(SCSI 3.0) – Good Atari + 50 pin internal Hard Drive (SCSI 0.0) + BlueSCSI V2 DB25 (SCSI 2.0) – Good Atari + BlueSCSI V2 Desktop50 (SCSI not seen) + BlueSCSI V2 DB25 (SCSI 2.0) – Only external BlueSCSI DB25 is seen In this last case BlueSCSI Desktop is completely inaccessible and doesn't show up only the external BlueSCSI is seen and accessible (BUS 1 : SCSI 2.0). But….. Atari + BlueSCSI V2 Desktop50 (SCSI 1.0) “TERM OFF” + BlueSCSI V2 DB25 (SCSI 2.0) -Good : but it is not practical if DB 25 is removed, the Blue Desktop no longer boots (because TERM is OFF) And now some test with the Old (v2022) and the new v2023 (jumper free)DB25 Bluescsi V2 Inside ATARI Jumper TERM SCSI ID And Outside Atari Jumper TERM SCSI ID Result BlueSCSI Desktop ON 1.0 + Nothing OK BlueSCSI Desktop ON 1.0 + Real Hard drive ext Bouchon 3.0 OK Real Hard Drive resistor 0.0 + BlueSCSI DB25 v2023 no jumper 2.0 OK BlueSCSI Desktop ON not seen + BlueSCSI DB25 v2023 no jumper 2.0 only DB25 ok BlueSCSI Desktop OFF 1.0 + BlueSCSI DB25 v2023 no jumper 2.0 OK BlueSCSI Desktop ON 1.0 + BlueSCSI DB25 v2022 OFF 2.0 OK BlueSCSI Desktop ON not seen BlueSCSI DB25 v2022 ON 2.0 only DB25 ok nothing + BlueSCSI DB25 v2022 ON 2.0 OK nothing + BlueSCSI DB25 v2022 OFF not seen nothing Thank you. That’s why I calling for the return of the TERM jumper eventually future version of DB25 cards. I bought my cards by : https://shop.onegeekarmy.eu/index.php/product/bluescsi-v2-db25-smaller-design/ Blue SCSI. Is a very great thing for old computers. Even for Atari MegaSTE and Atari TT Thank you for your great job Best regards, Luc GANTNER : France

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Le 22 juil. 2024 à 15:35, Eric Helgeson ***@***.***> a écrit : Hi there - would like to understand this a bit more - BlueSCSI DB25 is meant to be placed (and can really only be placed) at the end of the SCSI chain, which requires termination. What does your entire SCSI chain look like? I suspect there is some odd termination issue happening which is causing this issue, removing termination from the end of the chain doesn't seem like the "right" solution. You can still build the 2022 version if you wish, the files still exist in github. — Reply to this email directly, view it on GitHub <#172 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/BHJ3XYJSU5VKV5VBR5MTALDZNUDAJAVCNFSM6AAAAABLIK5XVOVHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTAMJRGUYTMMI>. You are receiving this because you authored the thread.

[fdanapfel]

@lucg2 Do you have the 3 internal terminator resistor packs in your Atari TT030 removed (see https://mikrosk.github.io/doitarchive/doit_st/0d09.htm)?

If not then it is only possible to either use internal OR external SCSI devices, because the TT itself will be terminating one end of the SCSI chain.

Another thing that might help is to install the Term power mod on the TT mainboard: https://www.exxosforum.co.uk/forum/viewtopic.php?t=4933