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Author Topic: iMac Holy Grail achieved ! Boot screens on 780m in 2011 iMac 27".  (Read 10564 times)
Rominator
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« Reply #45 on: September 29, 2018, 01:03:11 AM »

i got messaged that this thread was getting discussed at MR

i really hope to finish the rom, but I may be overlooking something simple

a perfect example is in the MR iMac thread.

A guy got a 21" from a Uni and  mistakenly says it is Firmware Password locked.

But he describes a folder with flashing question mark on boot.

This has been the "I can't find a boot drive" behavior as far back as I can remember.

but lots of helpful folks are outdoing themselves trying to help him get firmware issue fixed, an issue he doesn't have
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moopha
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« Reply #46 on: September 29, 2018, 09:19:22 AM »

Hey, Rominator, what size of ROM is expected in kilobytes?

My particualar 780M has a GD GD25Q20 EEPROM chip onboard, which capacity is 2048Kbit/258 Kbytes.
Is it enough to fit?
According to TechPowerUp BIOS database, none of 6 BIOSes exceed 164KB.
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Rominator
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« Reply #47 on: October 03, 2018, 09:53:18 PM »

yes, that should work
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moopha
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« Reply #48 on: October 04, 2018, 07:28:26 AM »

Got it, that's good


But ROM is still expected, is there any progress?
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Nenz
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« Reply #49 on: October 17, 2018, 01:11:04 AM »

Found DarwinDumper from original iMacs over here https://applelife.ru/threads/darwindumper-dampy-nastojaschix-macov.39174/
I wonder if this information from iMac 14,2 can help in understanding what need to be done?
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