Bit of help needed with IOMD ROMs

Hi – new to the forums so please let me know if this is in the wrong place.

Have recently resurrected a RISC PC with the the physical RISC OS 5.20 ROMs i have had on the bench for some time.
Have now received the latest 5.22 ROMs.

Can someone please advise the procedure for upgrading.
ie do i just change over the ROMs and i am done OR
do i need to also update the !Boot and !System (plus any other folders)?

Some other queries you might be able to help me with:
- is there anyway to get the scroll wheel to work on the RISC PC with 5.20/5.22
(have got a PS2mouse (older one not the mini) with a PS-2 Scroll Wheel mouse), a scroll wheel is sorely missed coming from windows/linux
- i have not been able to get an Addonics SD to IDE adpater to work with an Etherlan 600 (602) network card present (the network card would not initialise with the Addonics card in place – works OK with a standard IDE drive)
- i have not been able to get 2Mb VRAM to work – hangs on initialisation – 1MB works OK (have tried 2 different 2Mb VRAM modules from other machines – were working when last used), anyone know how to get 2Mb to work – would be much nicer with higher colours and screen resolution
- are there any podules that anyone has managed to get working with 5.20/5.22 on the RISC PC?

Thanks in anticipation of any help.

Cheers
Jock

Thanks to the ROOL team for their replies.

Re upgrading from 5.20 to 5.22:
“The installer will rename out of the way any !Boot and install a completely
new one, which isn’t strictly necessary if you installed it new at 5.20.
Inside the “HardDisc4-522/zip” archive you’ll find an “InSituBootUpdate”
which will apply the changes within !Boot over an existing 5.20 install.
Run that, shutdown the computer, replace the ROMs, then turn back on."

Re Scroll Wheel mice
- this doesn’t seem possible unless someone can get one of the USB cards working on 5.20/5.22 on the RPC

Re the Addonics SD to IDE adpater and etherlan
– CJE have had this problem too – but only with the Etherlan type network podules

re 2Mb VRAM
- I will keep trying as ROOL test this configuration and it should be able to work (will try with/without Etherlan and also try processors in different sockets etc)

Hopefully his may also help someone else.
Cheers
Jock

Re the Addonics SD to IDE adaptor, if it’s in a podule slot this may be a hardware issue. The podule IRQ interrupt line is supposed to be Open Drain so that any podule can drive it low on the same wire, any podule not asserting this should make the line high impedance. This is how it was on the A300 and A400 series. But from A400/1 through to A5000 series Acorn added logic gates for podule IRQs on the backplane so that RISC iX could disable some. So some podule manufacturers got lazy and drive the line high or low, Atomwide Ethernet card did this. Then on the Risc PC Acorn omitted the gates and things went wrong, I had to cut a track and solder a transistor to my Atomwide ethernet card with instructions that were sent to me, this made it drive Podule IRQ correctly as per the Acorn specs ie. Open Drain.

I believe the DesignIT EtherLan card gets this right and drives podule IRQ Open Drain, but I wouldn’t bet my life savings on it. And there are several different versions of the card. But with the SD card adaptor I have no idea, if it were driving high the the ethernet card wouldn’t work.

The NIC slot is immune to this problem, it has it’s own private interrupt line.

I may be wrong, but I feel it’s worth pointing this out.

Re. 2MB VRAM not working.
There were some VRAM sticks that would not work with STrongARM.

We’ve had problems with a number of NIC slot DesignIT cards and SD-IDE adaptors

Owen: could you email me I’d like to go further into this. chris@cjemicros.co.uk