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[News] AmigaOne no on-board sound?ANN.lu
Posted on 06-Mar-2004 01:38 GMT by lawd135 comments
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Commenting a recent news item on amiga-news.de, Davy Wentzler of OS4 fame said the on-board sound of the AmigaOne does not work, furthermore explaining the chip is physically not present on AmigaOnes produced the last 9 months. Frank Gutschow said on 05-Mär-2004, 23:38: "Meines erachtens sollte definitiv wirklich ersteinmal der Onboard-Chip des AmigaOne unterstützt werden."

Davy Wentzler answered on 05-Mär-2004, 23:45: "I'm gonna say it once more: it doesn't work. There's even a big chance, the chip is not physically present anymore on boards manufactured in the past 9 months."

Will Eyetech exchange all defect and component missing AmigaOnes or will they refund users that received broken hardware?

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AmigaOne no on-board sound? : Comment 107 of 135ANN.lu
Posted by NorthWay on 06-Mar-2004 21:26 GMT
In reply to Comment 84 (Don Cox):
[Memory Protection]
>It was left out because the 68000 doesn't have a built in MMU, not to make life easier for games programmers.
>I am sure it would have been included if an MMU had been present.

I am not 100% sure of that.

The extra cost that would have been added if it was possible to select from both a 68K with and without MMU would have slimmed chances of it getting added.

The memory overhead of Resource Tracking was probably the biggest factor that made it not happen. You'd need something like "Owner", "List(next/prev)", and "Size" (hey, much like Mungwall - what a surprise). That is 16 bytes extra 'wasted' for every AllocMem() (or 12 for AllocVec()).
Remember that the OS was designed for a 128K machine (I think Mindwalker actually was designed to work with only 128K). Then Moore continued to be the law and 256K became the release size.

Now, if RT has a memory overhead, imagine what an protection with an MMU would need. Try to check the size of your average MMU table.
Oh, and how would you handle the different memory ownerships of the running processes? One table per task? Ouch! Multiply the number of tasks with the MMU table size. Still happy with 128K? 256K?

Separating memory spaces would have lots of consequences for the OS design too. Much of the OS calls actually run in the context of your own task and as such you would need to change to a user/supervisor model to enable the libraries to have private data that the tasks can't access.
How would you handle SetFunction()? Would you still change the jump target for all tasks?


There are many more such issues that more competent people than me have asked before.



But HEY! I really like one thing about AmigaOS and that is the single address space. There is some interesting research going on under the moniker SASOS for 64bit machines. A lot of Amiga thinking can make a comeback that way.
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#108 Leif
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List of all comments to this article (continued)
Comment 108Leif06-Mar-2004 21:42 GMT
Comment 109Sam Smith06-Mar-2004 21:42 GMT
Comment 110Sam Smith06-Mar-2004 22:08 GMT
Comment 111Frank Gutschow06-Mar-2004 23:36 GMT
Comment 112Anonymous07-Mar-2004 00:29 GMT
Comment 113Anonymous07-Mar-2004 00:31 GMT
Comment 114Anonymous07-Mar-2004 00:41 GMT
Comment 115Anonymous07-Mar-2004 00:43 GMT
Comment 116Anonymous07-Mar-2004 00:59 GMT
Comment 117Atheist207-Mar-2004 03:42 GMT
Comment 118hammer07-Mar-2004 07:14 GMT
Comment 119hammer07-Mar-2004 07:26 GMT
Comment 120Don CoxRegistered user07-Mar-2004 09:02 GMT
Comment 121Don CoxRegistered user07-Mar-2004 09:09 GMT
Comment 122Don CoxRegistered user07-Mar-2004 09:23 GMT
Comment 123Graham_nli07-Mar-2004 12:52 GMT
Comment 124Graham_nli07-Mar-2004 13:06 GMT
Comment 125Ole-Egil07-Mar-2004 14:03 GMT
Comment 126Ole-Egil07-Mar-2004 14:06 GMT
Comment 127Christophe DecaniniRegistered user07-Mar-2004 14:25 GMT
Comment 128Framiga07-Mar-2004 14:51 GMT
Comment 129Graham_nli07-Mar-2004 15:55 GMT
Comment 130Graham_nli07-Mar-2004 15:57 GMT
Comment 131Davy Wentzler07-Mar-2004 20:45 GMT
Comment 132hammer08-Mar-2004 05:52 GMT
Comment 133hammer08-Mar-2004 06:14 GMT
Comment 134Graham_nli08-Mar-2004 10:47 GMT
Comment 135Jupp308-Mar-2004 16:59 GMT
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