Intel 286 chips for F22

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jlb RE:Intel 286 chips for F22 12/14/2003 9:28:24 AM

What would you need an OS for?

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denheer RE:Intel 286 chips for F22 12/18/2003 11:01:50 AM

In fact, base code that controls something can be called an OS. What you probable mean is why use a full blown OS like Windows NT? Of course this has advantages, you can develop faster because there is a clear programming protocol used by millions of people. The disadvantage is of course unknown bugs because of not/rarely used code that's made by a 3rd party (Microsoft in this case). Either way, In a critical application I would NEVER use 3rd party software. Of course the software for Fly-by-wire is already made for several other aircraft. You must be plain stupid not using this tested software as a base for your new aircraft.

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brit_view RE:Intel 286 chips for F22 12/18/2003 3:28:59 PM

So if the Raptor is using such primative chips and at the same time it has the power of 9 Cray supercomputers computing 350 million calculations a second that must add up to a lot of chips. . .?

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denheer RE:Intel 286 chips for F22 12/19/2003 3:13:03 AM

As I see it, It has never been said the Raptor uses 286 chips for ALL it's computing purposes. Radar, HUD, TADS, etc are much less critical then Fly-by-wire and needs loads of processing power. I think it's a save assumption to say other chips are used for those purposes.

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Dancing Johnny RE:Intel 286 chips for F22 12/20/2003 6:15:20 PM

You don't need superfast processing power to opererate most military or industrial hardware. And Microsoft has probably never written a single line of code for said hardware. Most of this code is written by the contractor and then burned on ROM or EPROM type chips. I'm no expert on Fly-by-wire systems (my last aircraft was 60's tech), but I would say that such aircraft use a number of different type proccessors, some will be less powerfull but more rugged than others. And remember, unlike a computer simulation, a real aircraft isn't having to use its computers to create a simulated world (which takes a lot of computing power). It just needs to to take inputs from its sensors and display that info to the pilot. I do think that the Situaltional Display of the F-22 will need a fair amount of computing power, but nothing in the way of today's P4 is needed.

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leoatwork RE:Intel 286 chips for F22 4/23/2004 4:31:22 PM

You might find this interesting; link it shows how good software can be if it's done right.

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rbrooku RE:Intel 286 chips for F22 5/4/2004 2:30:03 AM

The reason for 286 class chips is that most airforce software is 16 bit assembler code that started in the early eighties. If I remember, milstd 1750 was the standard designed by committee, and most of the subroutines for fast signal processing, fly-by-wire and so on were written and laboriously tested and debugged. In fact, needlessly complicating these routines just to run them on faster chips could be dangerous. Which gives you some idea how fast todays cheap desktops really are. Mostly, all the new processing power of todays pc's goes for things like multimedia, graphics and a bit of data crunching.

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