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Tube🍂Time

oh no! now i can't run old versions of OS/2!
25 May 2023 at 20:53 | Open on mastodon.social
11 comments
ionizedGirl

@tubetime @brion does it remove weird the string instructions

25 May 2023 at 21:02 | Open on toot.cat
William D. Jones
scrottie (he/him/they)

@tubetime Gah. I'm still trying to track down a copy of FTP Software's TCP stack for Xenix 286. Never going to get my machine on the 'net now =(

25 May 2023 at 21:08 | Open on anarchism.space
Scott Barnes
Chartreuse

@tubetime for some reason I thought 16 bit protected mode only existed on the 286 and wasnt preserved on the 386. Is that not the case?

26 May 2023 at 0:54 | Open on mastodon.sdf.org
Dantali0n :arch: :i3:

@tubetime this is going to save tons of die space and power though. Its one of the major things holding #X86 back. I think this quite fundamental change regarding backward compatibility is a direct response to #riscv . I suspect #ARM will soon follow

26 May 2023 at 6:11 | Open on fosstodon.org
Григорий Клюшников

Dantali0n :arch: :i3:, Apple SoCs already only support 64-bit mode from what I can gather. Android also prepares to be able to run on 64-bit-only ARM CPUs.

8 Jul 2023 at 16:52
Dantali0n :arch: :i3:

@grishka @tubetime I don't think this its true, according to both wikichip and wikipedia its just ARMv8.4, so it supports everything that does including thumb-2 instruction mode and the ability to swap endianness with a single instruction

10 Jul 2023 at 10:45 | Open on fosstodon.org
Dantali0n :arch: :i3:

@grishka @tubetime mind you to clarify, just because its a 64bit cpu does not mean it only has a 64bit mode. All modern x86 cpus are 64bit but still start in 16bit mode, het switched to 32bit real mode and only then enter 64bit mode. Although this situation is less awful for arm

10 Jul 2023 at 10:49 | Open on fosstodon.org
Григорий Клюшников

Dantali0n :arch: :i3:, but ARM, to the best of my knowledge, is opposite — it starts in its native mode (so the M1 starts in the 64-bit mode, so do Raspberry Pis) but then, if the OS is 32-bit, the bootloader switches it to the 32-bit mode at some point before the kernel starts. From reading various articles about reverse-engineering the M1 for the purpose of running custom OSes on it, I got the impression that it's incapable of switching to 32-bit mode and so it's safe to assume it doesn't implement it at all. I also remember reading that Yuzu, the Nintendo Switch emulator, when running on Apple Silicon, uses virtualization for 64-bit games but has to emulate the CPU for 32-bit ones for the same reason.

Dantali0n :arch: :i3:, but ARM, to the best of my knowledge, is opposite — it starts in its native mode (so the M1 starts in the 64-bit mode, so do Raspberry Pis) but then, if the OS is 32-bit, the bootloader switches it to the 32-bit mode at some point before the kernel starts. From reading various articles about reverse-engineering the M1 for the purpose of running custom OSes on it, I got the impression that it's incapable of switching to 32-bit mode and so it's safe to assume it doesn't implement...

10 Jul 2023 at 14:13
Dantali0n :arch: :i3:

@grishka @tubetime ah so they basically got to license an ARMv8.4 core and then nuked part of the ISA and ARM was like, sure this seems fine, I believe you but does not seem like something you want from an ISA even if it drastically cuts down on required die space.

I wonder what other features are missing, would it even run thumb-2. Almost tempted to get one now an figure it out. Then again someone probably already investigated this if I dig deep enough

10 Jul 2023 at 14:45 | Open on fosstodon.org
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