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[Web] RISC OS vs. AmigaOSANN.lu
Posted on 03-May-2004 03:42 GMT by Ronald St-Maurice22 comments
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Are we so dissimilar? If you asked us to list the troubling issues facing the RISC OS platform right now, the lack of more modern hardware support and the OS development split between Castle and RISCOS Ltd. would probably be there, right at the top, beating other problems like the USB split between Castle and Simtec and the gradual slowdown in software development... More...
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Comment 1Ole-Egil03-May-2004 11:07 GMT
Comment 2Sammy Nordström03-May-2004 12:25 GMT
Comment 3itix03-May-2004 13:04 GMT
Comment 4pixie03-May-2004 13:09 GMT
Comment 5Amon_ReRegistered user03-May-2004 13:27 GMT
Comment 6Kjetil03-May-2004 13:35 GMT
Comment 7JKD03-May-2004 13:44 GMT
Comment 8Don CoxRegistered user03-May-2004 14:07 GMT
Comment 9Graham_nli03-May-2004 14:50 GMT
Comment 10Darth_XRegistered user03-May-2004 14:56 GMT
Comment 11Christophe DecaniniRegistered user03-May-2004 15:10 GMT
Comment 12minator03-May-2004 15:27 GMT
Comment 13Kolbjørn Barmen03-May-2004 16:25 GMT
Comment 14Joe "Floid" Kanowitz03-May-2004 16:57 GMT
Comment 15Ronald St-Maurice03-May-2004 17:14 GMT
Comment 16Seehund03-May-2004 17:36 GMT
RISC OS vs. AmigaOS : Comment 17 of 22ANN.lu
Posted by Graham_nli on 03-May-2004 20:21 GMT
In reply to Comment 15 (Ronald St-Maurice):
The 26-bit addressing is a quirk of the early ARM designs. More modern ARM designs don't have that restriction, and even old designs like ARM7 only have it as a backwards compatibility issue. As this was designed in 1984, a 64MB address space would have been seen as amazingly huge, and it simplified some of the other implementation issues.

ARM1 was used in BBC Micro second processor units. ARM2 was used in the Acorn Archimedes. 32-bit addressing arrived with the ARM Version 3 (ARM6, ARM60, ARM600, ARM610, etc) processor / macrocell.

I think that ARM are currently on Version 5 or 6 of their instruction set.
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List of all comments to this article (continued)
Comment 18Hammer04-May-2004 08:16 GMT
Comment 19Raffaele05-May-2004 06:40 GMT
Comment 20dirty dave05-May-2004 09:27 GMT
Comment 21Kjetil05-May-2004 19:08 GMT
Comment 22NutsAboutAmiga23-Jun-2004 12:35 GMT
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