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  1. If they are HASL finished instead of ENIG + Gold...

    If they are HASL finished instead of ENIG + Gold Fingers and I had to bet, I would bet that is the reason.

    In that case, try cleaning them with isopropyl alcohol.
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    I have tested your solution and for those XT...

    I have tested your solution and for those XT systems that do not have the adapted BIOS it is perfectly valid:
    ...
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    Kicad project, gerbers and SPLD files already...

    Kicad project, gerbers and SPLD files already available:

    https://github.com/spark2k06/hardware/tree/master/RTC8088
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    They are very pretty, but are they sold today?...

    They are very pretty, but are they sold today? Where and for how much? Are they configured on the standard port 70h?
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    Now available in Tindie, soon will publish the...

    Now available in Tindie, soon will publish the gerbers, the Kicad project and the SPLD files.

    https://www.tindie.com/products/spark2k06/rtc-isa-8-bits-v2-very-low-profile-spld/
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    The machine to which it is intended is an XT, and...

    The machine to which it is intended is an XT, and I think that not everyone has RTC unlike AT. In my case, and more specifically, I built it to use it on my Micro8088, to which I modified its BIOS to...
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    New design removing discrete logic and replacing...

    New design removing discrete logic and replacing it with an SPLD:
    ...
  8. Sold both!

    Sold both!
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    Now I offer this product through Tindie for whom...

    Now I offer this product through Tindie for whom you may be interested, kit or fully assembled:

    https://www.tindie.com/products/spark2k06/rtc-isa-8-bits-very-low-profile/

    I have modified the...
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    Posted in Hackster. It includes gerbers, scheme...

    Posted in Hackster. It includes gerbers, scheme and board (Eagle). BOM also lists links to purchase them. Everything is published under the GPL3+ license:
    ...
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    RTC ISA 8 bits (Very Low Profile)

    I share a variant of the SMBacker RTC design:

    https://github.com/spark2k06/hardware/blob/master/RTC8088.png?raw=true

    Gerbers availables on OSHPark

    This design consists of a very low profile...
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    Now discounted for the latest units of the PRO...

    Now discounted for the latest units of the PRO version and back in stock of Basic version, with improvements over the previous batch. :cool:
  13. xD, I get it.

    xD, I get it.
  14. Damn Google translator ... I'm sorry with English...

    Damn Google translator ... I'm sorry with English and thanks :-)
  15. Correct, all the information is now public ;-)....

    Correct, all the information is now public ;-). Nor did he want to send spam with this case, so he wanted to go into private details to potential stakeholders.
  16. I'm sorry, does PECAK mean broken? Okay, I go...

    I'm sorry, does PECAK mean broken? Okay, I go into detail, one of them sure, yes ... the RS232 transceiver was upside down, the board booted but obviously the serial port did not work. When...
  17. The problems have been due to other causes...

    The problems have been due to other causes related to the assembly, they were the first two that I assembled. It has nothing to do with the revision of the board, which is already correct (v1.2).
    ...
  18. I've reflashed the SPLD and nothing, FFs in...

    I've reflashed the SPLD and nothing, FFs in segment E0000 even with switch 3.5 on. Yes, when I change SPLD and 74F00 I also open and close JP3-JP4 accordingly.

    It's a mystery. Should it be...
  19. I will flash it again, but I would say yes ......

    I will flash it again, but I would say yes ... the speaker works without any problem with the SPLD.

    However, what explanation is the duplication of content in E0000 and F0000 using 74F00 instead...
  20. For a while now I am having a problem with this...

    For a while now I am having a problem with this board.

    With configuration 74F00 (U14) segments E0000 and F0000 are duplicated. Boot fine because the duplicate BIOS is in FA000 but there is an...
  21. Sold. If anyone has an interest in the other...

    Sold.

    If anyone has an interest in the other PCBs with problems, I will provide detailed information and prices by private message.
  22. Several months ago I ventured to build this...

    Several months ago I ventured to build this project. Finally I can say that I have achieved it, after many setbacks:
    ...
  23. RTC for Sergey's Micro8088 or NuXT MicroATX

    I have modified the BIOS to integrate an RTC into port 70h.

    https://mega.nz/#!WApVDQ4B!HoHotlgqbJ26ufMTQ8lVO_zfGm7vaiRQ4-fyDpi9Sl8

    From the same Micro8088 or NuXT we can use the Sergey...
  24. Sergey has already accepted the proposed changes...

    Sergey has already accepted the proposed changes in his GitHub and has improved several aspects of it, has also implemented optimizations as well as a code reorganization, etc ...

    Sources:
    ...
  25. Sources available in my github (I create a pull...

    Sources available in my github (I create a pull request in Sergey repository):

    https://github.com/spark2k06/8088_bios/tree/micro_8088

    I attach bios binaries in this post.
    I have not managed...
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