joevt's latest activity

  • J
    joevt replied to the thread PowerMac - universal output support cable pinout/circuit diagram available?.
    More on Apple Sense Codes at: https://tinkerdifferent.com/threads/documentation-for-db15-to-vga-adapters.318/post-21288 The VGA option...
  • J
    joevt replied to the thread TOPS FlashBox information.
    You need to make sure that your app or driver becomes the owner of the serial port so that others don't mess with your settings. I don't...
  • J
    joevt replied to the thread Mac 9500 PCI snaptastic plastics question.
    Break the remainder of the plastic fingers then create an alternative capture mechanism?
  • J
    joevt replied to the thread Beige G3 RAM and PSU questions:.
    Read the SPD in Open Firmware using this: \ Use read-iic ( len offset addr*2 -- addr len | false ) in a loop to look for i2c devices...
  • J
    joevt replied to the thread Beige G3 RAM and PSU questions:.
    The software (HwInit) will accept it as 512MB. The hardware might not be able to use all of it if the grackle is limited internally to...
  • J
    joevt replied to the thread Beige G3 RAM and PSU questions:.
    I believe that's a 128 MB physical bank (noted in the "Module size per bank" column of that table). The 4 or 2 banks in the "Bank x Row...
  • J
    joevt replied to the thread Beige G3 RAM and PSU questions:.
    I know the HWInit code in the Beige G3 ROM does check the SPD for RAM types EDO or SDRAM and has code for sizing based on that RAM type...
  • J
    joevt replied to the thread Beige G3 RAM and PSU questions:.
    There might be something strange about your terminal app's scroll back buffer or terminal emulation. I use Serial.app on macOS with...
  • J
    joevt replied to the thread Beige G3 RAM and PSU questions:.
    The Heathrow ERS and Paddington ERS and Gossamer SW ERS and Gossamer HW ERS documents have more info about the feature control bits and...
  • J
    joevt replied to the thread Beige G3 RAM and PSU questions:.
    Looks like you pasted the code twice after the dl command? You should not see the code being pasted during dl. Maybe I should have added...
  • J
    joevt replied to the thread Beige G3 RAM and PSU questions:.
    Read the feature control bits with this: F3000038 rl@-flip 8 u.r which works without opening the PC floppy device in Open Firmware.
  • J
    joevt replied to the thread Beige G3 RAM and PSU questions:.
    The rev D ROM does have support. Check the Heathrow feature control bits (32-bit register at offset 0x38 of the mac-io device). /**...
  • J
    joevt replied to the thread Apple LocalTalk interface box.
    I think it does all the things the Z8530 SCC can. Same register set for all 68K and PowerPC Macs which include an SCC...
  • J
    joevt replied to the thread LCIII EPROM?.
    LC III's gestalt ID is 27? aka gestaltVail? The flasher has these 5 options for that gestalt ID: - Intel 28F020, write: 40400000 read...
  • J
    joevt replied to the thread Question about the Macintosh Portable.
    Since you have a ROM slot, it is possible for a ROM module to exist. I don't have a list of everything Apple made so I can't say if...
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