The Keyboard Interrupt Says E

Description

A four-panel hand-drawn bird comic shows a gray bird on a branch speaking in assembly-like instructions. The first panel says "mov rax, rbx," the second says "add rax, rcx," a yellow bubble in the second panel says "HELLO IT'S ME THE KEYBOARD," a black bird in the third panel says "I HAVE AN IMPORTANT MESSAGE," and the final close-up panel contains only the large letter "E." A small "t.me/dev_meme" watermark appears near the bottom-left, and the comic is signed at the bottom-right. The technical humor comes from mixing x86-64 register operations with the absurdly simple payload of keyboard input, reducing hardware interaction to a dramatic delivery of one character.

Common Tags

AssemblyLanguageX86 LowLevelProgramming X86 CPUInstructionSet CPUArchitecture SystemsProgramming HardwareVsSoftware CodeExecution TechnicalAbsurdity TechnicalPuns Wordplay DeveloperHumor

Comments

Anonymous ★ Top Pick After all that register choreography, the interrupt handler still just wants to hand you an `E`.

Anonymous ★ Top Pick

After all that register choreography, the interrupt handler still just wants to hand you an `E`.
@mxkrsv 3y

But USB is a polled bus, isn't it?
1. @Anfid 3y
  
  It is
  
  @mxkrsv 3y
  
  So the meme is true only for PS/2 keyboards?
  
  @Anfid 3y
  
  And mice, yeah. I don’t remember any other older/less popular ports with hardware interruptions, but they probably exist
  
  @FallenChromium 3y
  
  I2C, but that's an internal one mostly used in laptops
  
  @ygerlach 3y
  
  yes, and only if you cpu is like 2 decades old.
  
  @RiedleroD 3y
  
  and integrated keyboards, since they don't have to adhere to any connector standard (though they often do just use the usb keyboard standard, so there's that)
  
  @ZgGPuo8dZef58K6hxxGVj3Z2 3y
  
  Yes
  
  dev_meme 3y
  
  y
  
  @endisn16h 3y
  
  /
  
  @RiedleroD 3y
  
  z
  
  @RiedleroD 3y
  
  (wrong keyboard layout)
  
  dev_meme 3y
  
  ???
  
  @RiedleroD 3y
  
  the joke is that the English and German keyboard layouts have y and z swapped for some reason
  
  @RiedleroD 3y
  
  qwerty vs qwertz
  
  @azizhakberdiev 3y
  
  should I use ctrl+y to undo then?
  
  @RiedleroD 3y
  
  no, Strg+Z
  
  @affirvega 3y
  
  Steal register + Z?
  
  @RiedleroD 3y
  
  steuerung + Z
  
  @affirvega 3y
  
  управление + я
  
  @RiedleroD 3y
  
  damn this guy can type R backwards
  
  @affirvega 3y
  
  I can do small 3 з
  
  @RiedleroD 3y
  
  holy shit
2. @ZgGPuo8dZef58K6hxxGVj3Z2 3y
  
  Yes
@ahmubashshir 3y

usb vs ps/2
@ygerlach 3y

also pulling with usb is still faster than interrupt based ps/2 because the transmission of data in ps/2 is way slower than the usual polling rate used for usb devices.
@RiedleroD 3y

I love how long the explanation is lol
@SamsonovAnton 3y

And then comes the x86 System Management Mode which just grabs the CPU at any time without the OS knowing about it. 😈
@spiritualattunement 3y

hardware meme at its finest

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The Keyboard Interrupt Says E

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