Nov 08,2023
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  • This works ONLY for 27C128 which means 2 x 16KB.
    Unfortunately ST and STe field diagnostics tests are 2 x 32KB in size.
    To make it work with 27C256 cut the trace between pin 27 and 28 in both ICs and connect pins 27 (A14) to A15 signal on cartridge port.
    Or better, choose another ST diagnostic card available here in shared projects that works right out of the box
    You can also use W27C512 instead of 27C256 but put the content in upper 32KB (chip pin 1 which is A15 is connected to power)

    Thank you very much for leaving feedback on this project. I'll be updating the Gerbers very soon to make this update effective. I'll leave messages here when the Gerbers are updated.

    Reply
  • I forgot to also add Copyright (Author) and year of development!

    Reply
  • Hi, a suggestions would be to have a little more printed infos, so you dont need to look them up again after ordering.
    Printed card descript_ion (Atari ST Diagnostic Cartridge), Revision, ROM types printed in the ROM-field, printed cap-type (100nF), the "top" could be way larger, since there is unused space!
    Thx for sharing!

    Reply
  • Hi, is this PCB also working with 27c256 or 27c512 EPROMs?

    Hello. It has only been tested with 27C128 but I don't see why you couldn't use a 27C512. Greetings

    db5fp 2024-05-18 19:05:44Reply

    Okay thank you Nicolas. I've order some PCBs and setup everything but the Diagnostic Program (Service Diagnostic Rev. 4.4) does not start from the cartridge. So there mighgt be a different error. Normal TOS operation is working. I've tried 27c256 and 27c127 EPROMs.

    Hello: Please see this website for more information. https://www.gossuin.be/index.php/archives/27-test-kit-atari-st

    db5fp 2024-05-21 04:12:42Reply

    Okay, Thank you! I've found that A14 is not connect on your PCB A14 of EPROMS is connect to +5V. Seems like Diagnostic ROM needs 2 x 27c256 and not fitting in 27c128 > A14 is needed.

    Thank you. I already update the information. The gerbers are took from the original ones.

    Reply
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