Re:A bootable CD image with a retro game in a single tweet
by narrator on Tuesday July 31, 2018 @04:17PM
(#17656700)
I remember x86 real mode back in the day. Pretty hideous and hacky compared to what we have now.
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Re:A bootable CD image with a retro game in a single tweet
by ghamrick on Tuesday July 31, 2018 @07:07PM
(#17658111)
I grew up (career wise) on CTOS systems with 286/386 processors that could address the full 16MB in protected mode without memory extenders or expanders that were available for DOS back in the day. Also premptive multi tasking. It was a great OS to learn on. more info - https://web.archive.org/web/20080828190425/http://www.byte.c...
Re:A bootable CD image with a retro game in a single tweet
by saagarjha on Tuesday July 31, 2018 @06:03PM
(#17657658)
> what we have now
x86 processors still boot into real mode…
Re:A bootable CD image with a retro game in a single tweet
by yjftsjthsd-h on Tuesday July 31, 2018 @06:40PM
(#17657926)
It's my understanding that UEFI actually comes up directly into long mode?
"UEFI firmware performs those same steps, but also prepares a protected mode environment with flat segmentation and for x86-64 CPUs, a long mode environment with identity-mapped paging. The A20 gate is enabled as well."
Re:A bootable CD image with a retro game in a single tweet
by dlubarov on Tuesday July 31, 2018 @11:38PM
(#17659456)
Unfortunately most BIOS services are only available in real mode, so it's often necessary to switch back and forth.
Re:A bootable CD image with a retro game in a single tweet
by basementcat on Tuesday July 31, 2018 @07:54PM
(#17658402)
This inadvertently triggered my A20 gate rage.
Re:A bootable CD image with a retro game in a single tweet
by bvc35 on Tuesday July 31, 2018 @04:35PM
(#17656848)
What's real mode?