Help upgrading acorn a4000 to riscos 4.02

[Martin Taylor]

Hi good people

After searching around the internet i can find no information on what jumpers i have to change on the a4000 from riscos 3.0 to riscos 4.02 roms... i can find information for a30x0 on jumper configs but nothing for the a4000 and the jumper i have on the board are LK32, LK31, LK6, LK18, Does anyone know what jumpers should be set to open or closed so the riscos4.02 roms will work ???

thank you

Martin

[Harriet Bazley]

On 16 Apr 2021 as I do recall,

I'm astonished to learn that it's possible to put RISC OS >3.1 on an
A4000 at all -- aren't the hardware assumptions completely incompatible?
(e.g. no 'deep sprite' mode, no ARM6 machine code instructions)


--
Harriet Bazley == Loyaulte me lie ==

"An American is a man with two arms and four wheels".

[Stuart]

In article <69e48a1e5...@bazleyfamily.co.uk>,

Harriet Bazley <har...@bazleyfamily.co.uk> wrote:
> On 16 Apr 2021 as I do recall,
> Martin Taylor wrote:

> > After searching around the internet i can find no information on what
> > jumpers i have to change on the a4000 from riscos 3.0 to riscos 4.02
> > roms... i can find information for a30x0 on jumper configs but nothing
> > for the a4000 and the jumper i have on the board are LK32, LK31, LK6,
> > LK18, Does anyone know what jumpers should be set to open or closed so
> > the riscos4.02 roms will work ???


> I'm astonished to learn that it's possible to put RISC OS >3.1 on an
> A4000 at all -- aren't the hardware assumptions completely incompatible?
> (e.g. no 'deep sprite' mode, no ARM6 machine code instructions)

Probably not

http://www.riscos.com/riscos/index.htm

--
Stuart Winsor

Tools With A Mission
sending tools across the world
http://www.twam.co.uk/

[Theo]

Harriet Bazley <har...@bazleyfamily.co.uk> wrote:
> On 16 Apr 2021 as I do recall,
> Martin Taylor wrote:
>
> > After searching around the internet i can find no information on what
> > jumpers i have to change on the a4000 from riscos 3.0 to riscos 4.02
> > roms... i can find information for a30x0 on jumper configs but nothing
> > for the a4000 and the jumper i have on the board are LK32, LK31, LK6,
> > LK18, Does anyone know what jumpers should be set to open or closed so
> > the riscos4.02 roms will work ???
>
>
> I'm astonished to learn that it's possible to put RISC OS >3.1 on an
> A4000 at all -- aren't the hardware assumptions completely incompatible?
> (e.g. no 'deep sprite' mode, no ARM6 machine code instructions)

You're correct. RISC OS 3.5+ won't run on an A4000. The hardware is quite
different.

The options are:

1) Find some RISC OS 3.1 or 3.11 ROMs from another A3010/A3020/A4000. It's
not really worth making extra effort for 3.11 as the changes are very minor.
3.19 was the German language version so you probably don't want that.

2) Look into the RISC OS 3.20 project, which aims to update the ROM image
with more modern modules:
https://stardot.org.uk/forums/viewtopic.php?t=14110
(it may also allow use of a 4MB ROM with extra goodies with some hardware
tricks)

Theo

[Harriet Bazley]

On 17 Apr 2021 as I do recall,
Theo wrote:

[snip]

> 2) Look into the RISC OS 3.20 project, which aims to update the ROM image
> with more modern modules:
> https://stardot.org.uk/forums/viewtopic.php?t=14110
> (it may also allow use of a 4MB ROM with extra goodies with some hardware
> tricks)
>

An interesting project!

--
Harriet Bazley == Loyaulte me lie ==

We are not punished for our sins, but by them.

[Martin Taylor]

Thank you to everyone that replied, of course it wont work i have no idea what i was thinking, i thought i had taken the roms out of a old a3010 that the motherboard went on a few years ago but now thinking about it the was in my old riscpc before the motherboard failed on that.... so yes that was really stupid of me sorry...... I will look do the RISC OS 3,20 looks a good thing, i will hold onto the old Roms keep them with the A4000 then i can always make it a stock machine if needed.


Thank you

Martin