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Author Topic: A1200 clockport, what can it be used for?  (Read 12082 times)

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Offline Trev

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Re: A1200 clockport, what can it be used for?
« on: August 27, 2009, 11:05:19 PM »
Quote from: DJBase;521138
Add a Subway and a USB Ethernet Adaptor....and here we go.


That's a good option, but after the memory overhead of both Poseiden and an IP stack, you wouldn't be doing much. The RRNet works, but.... In any case, an unexpanded A500/A600/A1200 won't be able to do much with the BSD-based stacks. 8 MB would do it, but any geeky A600 is probably going to have an A603 with 2 MB of chip and no fast.
 

Offline Trev

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Re: A1200 clockport, what can it be used for?
« Reply #1 on: August 27, 2009, 11:06:53 PM »
Quote from: espenbo;521153
I wan't a clockport splitter. Can be somthing simpel that you have to change befor you boot. But the I could cange betwen USB, mp3 and more.

Espen


Clockport devices are notoriously picky about timing and where the power is connected. ;-) A splitter sounds dangerous.
 

Offline Trev

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Re: A1200 clockport, what can it be used for?
« Reply #2 on: August 28, 2009, 04:37:29 AM »
Why would you use a clockport for that? If the common name were userport, I might consider attaching a clock to it.
 

Offline Trev

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Re: A1200 clockport, what can it be used for?
« Reply #3 on: August 28, 2009, 07:30:52 AM »
The CS8900 series (the chip used on the RRNet) doesn't reliably generate interrupts in 8-bit mode (per the datasheets), so it's up to the CPU to push the data around. (Those lines aren't wired on the RRNet, regardless.) Assuming the CPU could keep up with the traffic, a chip that does generate interrupts might produce suitable results. In either case, though, the card would be functional, and the higher-level protocols were designed with dropped frames in mind.

So really, the hardware isn't really the problem. It's the stack. AmiTCP and its derivatives have pretty hefty requirements, and a new, lightweight stack would need its own bsdsocket.library implementation to be useful to existing software. Open source applications could be modified to fit.
 

Offline Trev

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Re: A1200 clockport, what can it be used for?
« Reply #4 on: August 28, 2009, 07:52:12 AM »
Polling works well on the RRNet, but deciding when and where to poll quickly becomes a problem. I was using vblank and a low priority idle loop, which worked well in a test harness. Periodically forcing a softint to boost priority improved network performance, but the scheme I was using didn't play well with others. :-/

EDIT: I should add that network interface polling is (or was) in vogue: http://info.iet.unipi.it/~luigi/polling/
« Last Edit: August 28, 2009, 08:13:48 AM by Trev »
 

Offline Trev

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Re: A1200 clockport, what can it be used for?
« Reply #5 on: August 29, 2009, 12:28:19 AM »
Off topic, but a Fugitive/Bourne-style movie that's true to King's original Running Man novel would be cool. It doesn't have to be future-glitzy and filled with 80's sci-fi mock commercials. A setting similar to Children of Men would do just fine.

EDIT: Actually, Children of Men satisfies the requirement quite nicely. I guess a new Running Man doesn't have to be made. :-P