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XTIDE Universal BIOS

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    Originally posted by Krille View Post
    This is confusing. "TURBO button unpressed" - To me that means the machine is running at full speed since that button is actually used to slow down the machine. But I'm guessing you meant that the machine hangs when running at full speed?
    Exactly. You are right. It hangs when running at full speed.
    However, with the ISA bus set to 6.25 MHz it should work. Can you use the NICs without the ROMs with the machine set to 12 MHz?
    Yes it's looks strange it can't boot with ISA 6,25 MHz with XUB at NIC.
    The both NICs without boot ROM installed didn't hang the both machines regardless frequency set. Also I can load utility for 3com NIC and set its parameters at frequency 12 MHz. I didn't check the network. I don't know how to check network for NIC "B" because it BNC only.
    Also here are some updates of specs of my machines:
    - "another" 286 actually based on 10 MHz (not 12 MHz) AMD CPU.
    - Schneider VGA AT System 40 actually clocked at 12,5 MHz (not 12).
    This explains the reason that NIC "B" with both EEPROMs boots well in "another" 10 MHz 286 and hangs in Schneider at 12,5 MHz.

    I assume that the ISA frequency of Schneider AT remains unchanged regardless of the selected option in BIOS Setup.
    I think I must check actual frequencies at ISA bus in my machines first. hope that I can bring oscilloscope for the weekend and I'll back here with measurement results.

    May the issue be related to slow timings of EPROM chips used?


      Today I chrcked ISA clock by oscilloscope for my systems.
      P1 - 8,4 MHz
      Schneider: actually there are three options for CPU/ISA in the BIOS Setup: "6,25/6,25" (in this mode BUB boots), "12,5/12,5" and "12,5/6,25". In last mode the frequency of ISA (and CPU too) is 6,25 only for I/O operations to the expansion cards (another kind of operations such as memory read/write, CPU itself etc is perfomed at 12,5 MHz). The chipset is syncroniouse so it can't control different frequencies for CPU and ISA at same time.
      "another" 286: 12 MHz at full speed despite CPU rated 10 MHz installed. ISA clock behavior is the same as in Schneider with oprion CPU/ISA=12,5/6,25
      Also I tried with faster (80ns) PROM - this did not yield positive results.

      So it is clear root cause is incompability of mentioned NICs with high ISA frequency. Krille, thank you for advice! I will try with other NIC cards on my Schneider...


        I've tried a lot of NICs but each time got the same result.
        Also tried SCSI controller with his own ROM BIOS and behavior was the same: it can boots only when system frequency set to 6,25 MHz.