C Loving Bones
ARGVMI~1.PIF#USB keyboards can't interrupt the CPU themselves, but the USB controller continuously polls them and will interrupt it on their behalf. Loudly.
Chamomile 🐑@argv_minus_one This one will always be hilarious
Colin
Svavar the NeurospicyThe choice of the letter E may be a reference to the 'Lord Marquaad E' meme.
Ozzelot 
@svavar @argv_minus_one "only made sense in the late 2010s"
I would say the phrase "made sense" is doing a lot of work here.
mage_of_dragons@argv_minus_one Better than not receiving interrupts at all
m0xEE@[email protected] @[email protected]
Why? User interaction distracts the computers from doing really important things. We should seriously consider banning USB 😏
Why? User interaction distracts the computers from doing really important things. We should seriously consider banning USB 😏
@m0xEE @argv_minus_one You're right, what gives us the right to interrupt the cpu's very important add instruction
@[email protected] @[email protected]
Exactly!
"M-m-mkay, I've been procrastipolling the keyboard all day 🥺" — who needs a slacker computer like that? Let the little guy get the job done!
Exactly!
"M-m-mkay, I've been procrastipolling the keyboard all day 🥺" — who needs a slacker computer like that? Let the little guy get the job done!
fcalva@argv_minus_one Wasn't that meme about PS/2 keyboards ?
I've heard that the PS/2 keyboard interface has a dedicated interrupt line, but that doesn't appear to be true. https://electronic-engineering.ch/microchip/datasheets/pinout/pinout.html#keyboard_5
DrYak@argv_minus_one @fcalva Hi, old timer who wrote my own keyboard driver in assembler for a DOS game engine:
- technically, yes: the PS/2 mini DIN port and the older AT DIN port don't have an IRQ line themselves, they are merely some type of bidirectionnal serial.
BUT
- They talk to a keyboard controller at the other end of this serial connection (used to be an Intel 8042 micro controller), and that absolutely DOES fire IRQ 2 whenever there's data from the keyboard.
@argv_minus_one @fcalva so PS/2 do have an IRQ (2), it's just not handled by the keyboard (as you pointed out) but by a microcontroller on the motherboard.
(and the PS/2 protocol natively supports N-key rollover. Another advantage over USB)
USB is pretty much the same story: the controller on the motherboard is what signals an interrupt.
There is the difference that the USB controller doesn't necessarily have a dedicated line to the keyboard (there might be a hub in the way) and therefore resorts to polling, but there's still a keyboard interrupt.
I do have a keyboard that supports full HID and has n-key rollover, but it has to be toggled on by pushing a button on the keyboard.
I vaguely remember that this is because some BIOSes and/or OSes will try to switch over to full HID but not actually receive keystrokes properly because their full-HID implementation is buggy.
To work around this, the keyboard initially sends keystrokes over HIDBP. It only sends keystrokes over HID when the button is pushed to enable it.
Billy O'Neal@argv_minus_one damn, we have the "d.bug" anime version of this meme, now we need to commission someone for the cyberpunk version for the caption above...
Bj�rn@argv_minus_one Alt text helped me to really understand the joke