The Icon Bar Message Updates (RSS 2.0 feed) http://www.iconbar.com/forums/ Technology news and views richard@--iconbar--.com en-gb (c) The Icon Bar Message Updates 2010. All rights reserved. Wed, 01 Sep 2010 22:23:01 GMT The Icon Bar Message Updates: News 15 The Icon Bar Message Updates http://www.iconbar.com/images/logos/rss-TIB.gif http://www.iconbar.com/forums/ Loads of Acorn / BBC Micro stuff http://www.iconbar.com/forums/viewthread.php?threadid=11498&page=1#115224 http://www.iconbar.com/forums/viewthread.php?threadid=11498&page=1#115224 i found my beeb, but i bent off one of the inter word rom pins. what a bummer.
are you good with a soldering iron? ;-)

Posted by Stephen Scott (sa_scott)
6 comments in forum ]]> Thu, 02 Sep 2010 22:43:48 GMT RDPClient Riscos 6.20 http://www.iconbar.com/forums/viewthread.php?threadid=11499&page=1#115223 http://www.iconbar.com/forums/viewthread.php?threadid=11499&page=1#115223 Replace the Select6i1 file with the Select3i4 file, from within RISC OS 6.20's filer, shutdown, and reboot. Then it'll run.
wink

Posted by Eric Rucker (bhtooefr)
24 comments in forum ]]> Thu, 02 Sep 2010 17:43:31 GMT RDPClient Riscos 6.20 http://www.iconbar.com/forums/viewthread.php?threadid=11499&page=1#115222 http://www.iconbar.com/forums/viewthread.php?threadid=11499&page=1#115222 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 ]]> Thu, 02 Sep 2010 17:38:17 GMT Can someone look at this ARM code for me? http://www.iconbar.com/forums/viewthread.php?threadid=11467&page=1#115221 http://www.iconbar.com/forums/viewthread.php?threadid=11467&page=1#115221 I'm back! 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 ]]> Thu, 02 Sep 2010 16:17:26 GMT RDPClient Riscos 6.20 http://www.iconbar.com/forums/viewthread.php?threadid=11499&page=1#115220 http://www.iconbar.com/forums/viewthread.php?threadid=11499&page=1#115220 I wouldn't hold your breath.
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.Crybaby

I wouldn't hold your breath.

Posted by Andrew Poole (andypoole)
24 comments in forum ]]> Thu, 02 Sep 2010 07:05:27 GMT Help save my old RiscPC http://www.iconbar.com/forums/viewthread.php?threadid=11503&page=1#115219 http://www.iconbar.com/forums/viewthread.php?threadid=11503&page=1#115219 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. 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 ]]> Thu, 02 Sep 2010 01:16:04 GMT Help save my old RiscPC http://www.iconbar.com/forums/viewthread.php?threadid=11503&page=1#115218 http://www.iconbar.com/forums/viewthread.php?threadid=11503&page=1#115218 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 ]]> Wed, 01 Sep 2010 23:35:48 GMT RDPClient Riscos 6.20 http://www.iconbar.com/forums/viewthread.php?threadid=11499&page=1#115217 http://www.iconbar.com/forums/viewthread.php?threadid=11499&page=1#115217 Bother!! There was me thinking they were frantically trying to 'finish' 4.42 for me A9home. 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.Crybaby

Posted by Blind Moose (Acornut)
24 comments in forum ]]> Wed, 01 Sep 2010 23:20:26 GMT RDPClient Riscos 6.20 http://www.iconbar.com/forums/viewthread.php?threadid=11499&page=1#115216 http://www.iconbar.com/forums/viewthread.php?threadid=11499&page=1#115216 Given that this issue has existed for more than two years, absolutely nothing.
It's RISC OS 6 that's at fault.

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

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 ]]> Wed, 01 Sep 2010 23:13:10 GMT Help save my old RiscPC http://www.iconbar.com/forums/viewthread.php?threadid=11503&page=1#115215 http://www.iconbar.com/forums/viewthread.php?threadid=11503&page=1#115215 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. ...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 unhappy ...
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 ]]> Wed, 01 Sep 2010 22:23:01 GMT