I got that reference. Fuck, I’m old.
Please explain? I get that the chubby bird is speaking assembly, but I’m sure there’s more to it than that?
PS2 keyboards use interrupts rather than polling in USB, meaning every time a key is pressed the CPU stops what its doing to process it.
Cool! I had no idea it was deeper than just a physical interface change.
“do you know what ps/2 ports are?”
“holy cow, PlayStation 2? you must be AT LEAST 25!”
[dying inside intensifies]
Big keyboard jack, serial for mouse, parallel for printer
Don’t forget the serial input for gamepads and joysticks in the dedicated sound board for some reason
Early PC only had 5 card slots, and the only jack on the motherboard was the keyboard. One slot is going to be used by a video card, one’s probably being used by a hard drive controller, one’s probably used by a parallel + serial card. Soundcards also included controller ports to try to save a slot.
I thought sometimes they called them game ports (for the joystick.)
I reasoned if you are installing a sound card, you are probably doing some gaming, so it made sense to sort of bundle those together.
Its on the sound card because it’s a midi port. Its designed for connecting a keyboard (as in electronic piano). Most people used it for gamepads but that’s not what it was there for.
And because the PC only have 1 serial port, you disconnect the printer and use a parallel to serial adapter.
Except that wasn’t a serial port, it was midi, and the reason it was on the sound card was because the input was analog.
Your joystick was just two fancy potentiometers, and your soundcard decoded the voltage on the middle legs into a position.
Soundcards handled joysticks because they had the fastest ADCs.
More info: https://en.wikipedia.org/wiki/Game_port
The 15-pin D-sub connector itself was apparently a combination of analog and digital. It had to be, since MIDI is digital (it’s right there in the name: Musical Instrument Digital Interface). TIL it wasn’t all digital.
Wow, 30 years later and I’m just learning this now. Thank you
huh, i thought it was just because “owning a sound card” and “likely to play games” was the biggest overlap of the Venn circles.
They didn’t even use an ADC. They used 555 timers to produce a pulse. They measured the length of the pulse to determine the potentiometer position. Since there are 4 analog inputs, they typically used the 558 timer which is the quad version of the 555.
And here I thought I had it all figured out. But it does make sense. Doing it with an analog signal introduces noise and measuring pulse widths is going to be simpler.
Yes, this is where my PC master gaming started.
Are these not still in use?
I’ve not built a tower in a few years granted, but the last one I built had PS2 ports. Heck it even had VGA for the onboard graphics.
They are. Lots of motherboards still include these. There are a lot of special PS/2 input devices that are still around in business/industrial settings and gamers sometimes need them for use with flight sticks, steering wheels, mechanical keyboards etc.
Usually it’s a combo port now instead of a separate port for keyboard/mouse.
I actually wanted a PS2 port because it works with interrupts rather than polling but they aren’t really included anymore.
I feel like they don’t make boards for people like me who want small boards with a super niche port.
When a MoDT Mini-ITX board comes out with a PS2 port I will buy that instantly
Can you actually notice the latency?
I only had it briefly a long time ago,
I think certain things can stall the computer from polling, so if you’re computer is super weak or youre doing something super heavy it would suffer
Maybe its a placebo effect but I did notice it handle itself better when running multiple things.
“how old are you?”
TURBO!!!
The “Turbo” function was a masterstroke of marketing.
The actual function of the turbo is to slow the machine down, so it can be compatible with older games and software that ran too quickly on those newer systems.
Of course calling it a “slow down” button wasn’t very sexy, so just flip the function around and label it turbo instead!
I raise
edit, actually, it might have been on the back…it’s been forever since I touched one
I’ll see your raise, and up it:
Please,
