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  1. David Cook

    Help : making a startup extension for 68k macs

    Nope. You were right the first time to look for other PRAM values. The Mac clock with roll over in 2040 and would break a pre-1984 PRAM test.
  2. David Cook

    IIci boots twice

    Do you have a PRAM battery installed? If not, then the IIci is setting itself to 24-bit memory mode initially. And then the System software is setting it to 32-bit and rebooting. Just an educated guess.
  3. David Cook

    68040 mhz

    Yup. And I overclocked my DayStar 68040 to 50 MHz. https://68kmla.org/bb/threads/daystar-powercache-030-and-turbo-040-on-iici-with-overclock-performance-results.44658/
  4. David Cook

    What is the true 'maximum' file name size a Mac application should handle?

    Great solution!
  5. David Cook

    Macintosh IIfx tries to start but won't catch

    Agree completely.
  6. David Cook

    Macintosh IIfx tries to start but won't catch

    That is an interesting premise. I've seen capacitors go two ways: juicy or dried out. I assume this has to do with the climate they are stored in. I wonder if all alkaline batteries eventually burst catastrophically, or whether a subset of the batteries pass a certain point (outgassing?) where...
  7. David Cook

    Macintosh IIfx tries to start but won't catch

    Wonderful. Thanks for the update.
  8. David Cook

    Macintosh Portable SLIM cards

    Pretty awesome!
  9. David Cook

    Macintosh Portable SLIM cards

    Very cool. How were you able to trigger it and generate that screenshot?
  10. David Cook

    Macintosh Portable SLIM cards

    Digging around in the ROM and source code, Apple originally planned to include removable disk cards on the Macintosh Portable. This would have predated PCMCIA cards. In the source file, EDiskDriver.a, Gary Davidian ("GGD") appears to have begun work on EDisks around June of 1988. He first...
  11. David Cook

    Attempting To Program Something Using LLMs With Zero Knowledge or Skill

    Very interesting. I'm glad you're keeping us up to date. I'm not surprised it has been difficult. I'm skeptical of LLMs for programming, for the same reasons other people have already mentioned in this thread. But, as a new way of searching and presenting findings, LLMs are wonderful. So...
  12. David Cook

    Getting CPU Speed Using the Gestalt Manager

    @cheesestraws was quicker to the draw.
  13. David Cook

    Getting CPU Speed Using the Gestalt Manager

    I think the 'More information' tab (lower right of your screenshot) explains that it is redirecting this call from pclk.
  14. David Cook

    SE/30 video issue, half simasimac pattern

    Congratulations!!!
  15. David Cook

    Macintosh II Draining PRAM/Startup Battery

    Check D3. If the diode is failing, then battery B2 will drain through the entire +5V circuit. I don't know enough about UB6 to know if it has two modes. Low-power mode would just keep the clock running during sleep. High-power mode would run at full speed to allow clock/PRAM read/writes. My...
  16. David Cook

    Macintosh II Draining PRAM/Startup Battery

    B2, I presume?
  17. David Cook

    Maximum SiliconExpress IV Throughput

    Wow. I assumed there would be some flags or a driver call that would ask "Hey, can you run in 4.3 mode". Ok. That's the heart of my line of questioning. If the OS is really waiting, then a faster bus will make more of a difference to the user's perception, as the bus response time is a...
  18. David Cook

    Maximum SiliconExpress IV Throughput

    Very interesting! How much does the maximum throughput affect user perception? That is, how much does it shave off of boot time or launching an application? I don't know enough about SCSI, but can you make a call asynchronously to one drive, and then to another drive, and when the results are...
  19. David Cook

    Read/Write PRAM and xPRAM

    Thank you @frontein1
  20. David Cook

    Read/Write PRAM and xPRAM

    Where can I find a copy of that?
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