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Any combined source tree for RO4 and RO5 has to utilise the RO5 HAL model, its the way forward and the only sensible way to deal with PCI and graphics cards etc. Castle will undoubtedly require it t be done this way, but it would also have huge advantages for ROL and their AMSs, as it allows the development of low level device drivers to be further uncoupled from the operating system. A new HAL can be produced and slotted in to a ROM image without having to rebuild any OS code.

However, this is well ahead of the current situation, and any version of Select will have to utilise the exiting RISC OS 5 HAL, Kernel and driver modules in order to function on the Iyonix. This can be achieved simply by softloading the Select modules, or as ROL are suggesting extracting code from the RO5 ROM and incorporating it in to a softloaded ROM image. This seems overly complicated to me, but it is probably to maintain the illusion of ROL providing a complete OS rather than just extentions, for reasons of pride.

 is a RISC OS Userdruck on 28/10/05 11:08AM
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