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Author Topic: AGP bus expansion for Amiga?  (Read 9679 times)

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Offline freqmaxTopic starter

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AGP bus expansion for Amiga?
« on: August 24, 2012, 05:40:23 PM »
Do there exist any expansion for Amiga that makes it possible to make use of graphics cards with AGP bus connection ..?
 

Offline freqmaxTopic starter

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Re: AGP bus expansion for Amiga?
« Reply #1 on: August 24, 2012, 06:17:01 PM »
Any AGP expansion bus for any card at all?
 

Offline freqmaxTopic starter

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Re: AGP bus expansion for Amiga?
« Reply #2 on: August 24, 2012, 07:14:34 PM »
AGP is quite close to PCI from the system software side it's actually the same asfair. nyway the point is to use the card, not the bandwidth.

It's the same idea behind 8-bit MCU:s that have Ethernet connection at 10 or 100 Mbit/s.
 

Offline freqmaxTopic starter

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Re: AGP bus expansion for Amiga?
« Reply #3 on: August 25, 2012, 02:15:14 AM »
@LoadWB, You'r right but I were curious if such expansion ever was made in larger quantities.

PCI-e is proberbly the next target. But I suspect FPGA Amigas will be the thing when the real hardware will "die".
 

Offline freqmaxTopic starter

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Re: AGP bus expansion for Amiga?
« Reply #4 on: August 26, 2012, 12:13:24 PM »
Quote from: vox;705253
Not needed since AGP bus is just gfx card.

There are some special cards that (ab)use the AGP bus for other applications than graphics.

Quote from: vox;705253
Pegasos PPC boards use it.

There's some comments that the AGP isn't real or useless AGP 1x.
 

Offline freqmaxTopic starter

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Re: AGP bus expansion for Amiga?
« Reply #5 on: August 27, 2012, 12:11:23 AM »
If the market place mainly provide expansion cards using AGP. That's what goes into a design. Same with PCI, there's many embedded designs that have no use for even a small part of the capabilities found in PCI, but the marketplace dictate PCI as the common denominator. PCI-express is the interface of choice right now but it's a pain in regard to timing and RF design of circuit boards so I hope PCI card remain abundant.
USB has in essence replaced ISA ;) (both are crap!)
 

Offline freqmaxTopic starter

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Re: AGP bus expansion for Amiga?
« Reply #6 on: August 27, 2012, 01:31:21 PM »
USB is crap because:
 * Uses polling rather than letting devices tell when service is needed
 * Half-duplex with associated latency, superpositioning wave amplitude, speed and predictibility problems etc
 * Use of single ended signaling for out of band signaling
 * Hierarcical structure enforced, more complicated than a bus option
 * Single master (OTG is patchwork)
 * Limited to 127 units
 * Insufficient power 2,5 W (vs 45 W for firewire) which makes 3G dongles etc out of specification
 * Lacks galvanic isolation with signal transformers, like Ethernet is designed

ISA was in essence replaced by USB because they are on the same performance level and both serves as "geekports". PCI (and MCA/Zorro) are something completely different with autoconfig, wide bus, thought through transfer phases etc.
« Last Edit: August 27, 2012, 05:26:09 PM by freqmax »
 

Offline freqmaxTopic starter

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Re: AGP bus expansion for Amiga?
« Reply #7 on: August 27, 2012, 05:29:13 PM »
A technology is useful or not in a particular context.

As for USB, one could at least implemented some full duplex RS-422 or bus-like RS-485. Allowed multimaster operation. Allowed 12V with 1A at least. Implemented a bitrate of 100 kbit/s for easy MCU implementation. It's complicated to be too expensive, and crap enough to not be worthwhile. Look at Ethernet for how to do things.
 

Offline freqmaxTopic starter

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Re: AGP bus expansion for Amiga?
« Reply #8 on: August 27, 2012, 07:36:06 PM »
It were Intel that choosed the technical grounds not Joe Digicam. The cost for a better standard would have been less.
 

Offline freqmaxTopic starter

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Re: AGP bus expansion for Amiga?
« Reply #9 on: August 28, 2012, 05:14:11 AM »
Intel x86 the best **** under the sun .. ;)

Don't pay attention to the marketing man behind the curtain.