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Snowdrop OS - my operating system from scratch, in assembly language

Snowdrop OS - my operating system from scratch, in assembly language

Snowdrop OS was born of my childhood curiosity around what happens when a PC is turned on, the mysteries of bootable disks, and the hidden aspects of operating systems. It is a 16-bit real mode operating system for the IBM PC architecture. I designed and developed this homebrew OS from scratch, using only x86 assembly language. I have created and included a number of utilities, including a file manager, text editor, graphical applications, BASIC interpreter, x86 assembler and debugger. I also ported one of my DOS games to it. After all, what kind of an operating system doesn't have games? The Snowdrop OS and the apps are distributed as both a floppy disk (1.44Mb) image, as well as a CD-ROM image. The images contain the following, all programmed from scratch: - a boot loader which loads the kernel into memory - a kernel which sets up interrupt vectors to be used by user apps, and then loads the startup app - user apps, including a shell (command line interface), utilities, test apps, and aSMtris, my Tetris clone Snowdrop OS can also be installed to a hard disk - prompting the user to do so during boot - if it detects one. I hope that Snowdrop can serve other programmers who are looking to get a basic understanding of operating system functions. Like my other projects, the source code is fully available, without any restrictions on its usage and modification.   originally posted at

Stacker News

Snowdrop OS - my operating system from scratch, in assembly language \ stacker news ~Design

Snowdrop OS was born of my childhood curiosity around what happens when a PC is turned on, the mysteries of bootable disks, and the hidden aspects ...

Google's official URL shortcut is compromised

Gist

almost_pwned.md

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g.co, Google's official URL shortcut (update: or Google Workspace's domain verification, see bottom), is compromised. People are actively having their Google accounts stolen. Someone just tried the most sophisticated phishing attack I've ever seen. I almost fell for it. My mind is a little blown. - Someone named "Chloe" called me from 650-203-0000 with Caller ID saying "Google". She sounded like a real engineer, the connection was super clear, and she had an American accent. Screenshot. - They said that they were from Google Workspace and someone had recently gained access to my account, which they had blocked. They asked me if I had recently logged in from Frankfurt, Germany and I said no. - I asked if they can confirm this is Google calling by emailing me from a Google email and they said sure and sent me this email and told me to look for a case number in it, which I saw in the email string. I asked why it said important.g.co and she said it was an internal Google subnet.  OK, so that can't be from a google.com email, right? It must be a spoofed email using g.co, which doesn't have DKIM / SPF turned on - right? Nope.   originally posted at

Stacker News

Google's official URL shortcut is compromised \ stacker news ~security

g.co, Google's official URL shortcut (update: or Google Workspace's domain verification, see bottom), is compromised. People are actively having th...

@𝕾𝖊𝖗 𝕾𝖑𝖊𝖊𝖕𝖞 v2

A QR code that sends you to a different source based on the angle

Mastodon 🐘

Christian Walther (@isziaui@mstdn.social)

Attached: 1 image @gvy_dvpont@mastodon.social Got me thinking… can it be done without the lens? This one seems to work!

Playing with the idea of "different perspectives on the same story"! A QR code that sends you to a different source based on the angle.  originally posted at

Stacker News

A QR code that sends you to a different source based on the angle \ stacker news ~Design

Playing with the idea of "different perspectives on the same story"! A QR code that sends you to a different source based on the angle. [4 comments]

#JFK