On Tue, Mar 02, 1999 at 12:22:21PM +0000, Alistair Riddoch wrote:
> Simon Wood writes:
> I have been trying to keep up with the SIBO-Linux project hosted by Matt
> Gumbley, but I can't remember seeing anything for a while, and got a bit
> stuck because last I checked they weren't releasing the code for fear of
> upsetting psion.
>
> The info on your page is great. I will give it a try as soon as I remember
> to bring my serial cable in from home. I will have to try the code on my 3c
> which I use for work. I have a sacrificial 3a which I got specifically for
> testing dodgey code, but I don't have a cable for it.
>
> If you have managed to circumvent memory protection, which looks to be the
> case, then starting to get ELKS onto a psion should be possible. We will
> need a boot loader to load a kernel image, then we can start modifying the
> code and see what happens.
Turning of adress is done (as shown by Simon's code) by writing to
port 0x15. The code in ROM also clears the byte at ss:0x22, don't
know if this is necessary. Writing to port 0x14 turns the protection
on again.
I have various notes of things I've found out by disassembling etcr.
If you nedd anything, just ask.
/mattias
