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RDPClient Riscos 6.20

Replace the Select6i1 file with the Select3i4 file, from within RISC OS 6.20's filer, shutdown, and reboot. Then it'll run.

Posted by Eric Rucker (bhtooefr)
24 comments in forum

RDPClient Riscos 6.20

So if I want to run it on Riscos 6.20 what do I need to do?

Posted by David Heath (HeathHayle)
24 comments in forum

Can someone look at this ARM code for me?

There's some funky stuff the OS does during startup to get the hardware working....

I'd suggest either looking over the 3.x kernel sources in the ROOL source tree or looking at/using RPCEmu. Or if you want the fun of working it out for yourself, try adding some logging code to both ROLF and RPCEmu and see what each does for the first N instructions up until the crash.

I'm back!

As you suggested, I've been looking at the RPCEmu source for indications of how the hardware works (as well as the RPC TRM, various datasheets, etc.). I even tried integrating the cmos.c code into the emulator, with some success.

I've decided, though, to try identifying routines in the OS by purpose (e.g. "read configuration data" instead of all the i2c bit twiddling) and "patching" the emulated code to call native code routines to perform the necessary functions. The aim is to avoid emulating any specific hardware external to the processor and see just how many (or few) routines are needed to do that. The downside is that, initially, the emulator won't work with anything other than RO4.02 ROM images (although modifying it to work with others should just be a matter of finding the addresses of the appropriate routines).

I've noticed a couple of strange encodings for instructions in the ROM, can anyone tell me if I've missed something in the ARM ARM?

These two instructions are encoded with the (non-existant) op1 as r15 instead of the usual r0. They don't have the S bit set, so as far as I can see they're not the "P" version of the instructions. Any ideas (or is this another thing I can safely ignore)?

03829b20 e3af1e27 mov r1, #624 ; =0x270

03829b84 23af2e27 movcs r2, #624 ; =0x270

Posted by Simon Willcocks (Stoppers)
6 comments in forum

RDPClient Riscos 6.20

I'm sure ROL are busy making some more rounded buttons ...

Bother!! There was me thinking they were frantically trying to 'finish' 4.42 for me A9home.

I wouldn't hold your breath.

Posted by Andrew Poole (andypoole)
24 comments in forum

Help save my old RiscPC

There is no one who has access to it, and even the people around there would not even know what a PC looks like, let alone a CMOS battery Thanks for the advice about the RAM.

I'd get someone who has access to it to look at it to make sure the battery isn't leaking.

4.02 is what I'd consider the minimum OS for use of RISC OS software that's currently being developed.

Also, if you're softloading an OS, it may subtract 6 MiB of RAM from the RAM count - when I boot 4.02, it says I have 98 MiB (96 of RAM, 2 of VRAM,) then when it softloads 6.20, it says I have 90 (96 of RAM, minus the six megs of softload, and not counting the VRAM.)

Posted by riscy (riscy)
12 comments in forum

Help save my old RiscPC

I'd get someone who has access to it to look at it to make sure the battery isn't leaking.

4.02 is what I'd consider the minimum OS for use of RISC OS software that's currently being developed.

Also, if you're softloading an OS, it may subtract 6 MiB of RAM from the RAM count - when I boot 4.02, it says I have 98 MiB (96 of RAM, 2 of VRAM,) then when it softloads 6.20, it says I have 90 (96 of RAM, minus the six megs of softload, and not counting the VRAM.)

Posted by Eric Rucker (bhtooefr)
12 comments in forum

RDPClient Riscos 6.20

I'm sure ROL are busy making some more rounded buttons ...

Bother!! There was me thinking they were frantically trying to 'finish' 4.42 for me A9home.

Posted by Blind Moose (Acornut)
24 comments in forum

RDPClient Riscos 6.20

It's RISC OS 6 that's at fault.

So what, if anything, are RISCOS Ltd doing about it then?
Answers on a Postcard!

Given that this issue has existed for more than two years, absolutely nothing.

I'm amazed people still pay their Select subscription. So far this year, they've got absolutely nothing in return for their hundred quid. I'm sure ROL are busy making some more rounded buttons and new icon sprites for them for next year though. Who knows, maybe they'll finally actually centre the 6 in the RO6 switcher icon...

Posted by Andrew Poole (andypoole)
24 comments in forum

Help save my old RiscPC

...Unfortunately I will not be able to get hands on with the SA RiscPC until June next year - it is not here where I am ...

Wow - you're going to be doing all this with some considerable anticipation. In the mean time, you could always investigate with emulation on the Mac.

Posted by Trevor Johnson (trevj)
12 comments in forum

RDPClient Riscos 6.20

For anyone wondering, this c.s.a.p thread explains the whens/whys/hows of the situation.

Posted by Jeffrey Lee (Phlamethrower)
24 comments in forum