something like this should work ok
https://www.ebay.co.uk/itm/291759355005 ... xyni9TA4Ux
Aurora Minerva Boot Error
- XorA
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Re: Aurora Minerva Boot Error
I’ve actually found a suitable replacement. I was trying to see if there was a charge voltage but the battery is utterly dead so pulling that down.Pr0f wrote:the CR2032 is a non rechargeable lithium cell - and the Minerva board probably has a charge circuit on board for that battery - in fact I think it may even be built into the RTC chip on the board - so you should replace it with a rechargeable.
However, you can wire a diode in series with the battery - with the stripe on the diode being furthers away from the battery positive - and this will prevent current entering the battery - then you can use a Lithium cell.
Positive to Minerva (red lead) ----|<---+||- ----O volts (black lead)
I do have cr2032 adapters for Amiga with the diode already in there.
Re: Aurora Minerva Boot Error
They should work a treat thenXorA wrote:I’ve actually found a suitable replacement. I was trying to see if there was a charge voltage but the battery is utterly dead so pulling that down.Pr0f wrote:the CR2032 is a non rechargeable lithium cell - and the Minerva board probably has a charge circuit on board for that battery - in fact I think it may even be built into the RTC chip on the board - so you should replace it with a rechargeable.
However, you can wire a diode in series with the battery - with the stripe on the diode being furthers away from the battery positive - and this will prevent current entering the battery - then you can use a Lithium cell.
Positive to Minerva (red lead) ----|<---+||- ----O volts (black lead)
I do have cr2032 adapters for Amiga with the diode already in there.
![Smile :-)](./images/smilies/icon_e_smile.gif)
Re: Aurora Minerva Boot Error
those rechargeable batteries have a shelf life of about 10 years - so if that was the original one - it's easily 20+ years old ![Smile :-)](./images/smilies/icon_e_smile.gif)
![Smile :-)](./images/smilies/icon_e_smile.gif)
Re: Aurora Minerva Boot Error
Markus? Or did you mean Marcel?XorA wrote:Yes according to Markus excellent doc that’s the remapped rom!Pr0f wrote:Is that the redirected ROM address?
The location it is having an issue with is 0x0400000, which is the address immediately after the 4MB SGC RAM area - I believe this is where SGC maps the original ROM to (in your case Minerva).
I wonder if you need to tell the boot loader not to test after 4MB limit? - there was a way to do that in the I2C battery backed RAM that's on your Minerva.
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- XorA
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Re: Aurora Minerva Boot Error
Ooops 2nd time Ive done that I think!dilwyn wrote:Markus? Or did you mean Marcel?XorA wrote:Yes according to Markus excellent doc that’s the remapped rom!Pr0f wrote:Is that the redirected ROM address?
The location it is having an issue with is 0x0400000, which is the address immediately after the 4MB SGC RAM area - I believe this is where SGC maps the original ROM to (in your case Minerva).
I wonder if you need to tell the boot loader not to test after 4MB limit? - there was a way to do that in the I2C battery backed RAM that's on your Minerva.
- mk79
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Re: Aurora Minerva Boot Error
2nd time I've read it in the forum today even, by different people! Most British brains for some reason cannot process my nameXorA wrote:Ooops 2nd time Ive done that I think!dilwyn wrote:Markus? Or did you mean Marcel?XorA wrote:
Yes according to Markus excellent doc that’s the remapped rom!
![Very Happy :-D](./images/smilies/icon_e_biggrin.gif)
Hi Marcus!
Hi! And it's, Marcel.
Oh, sorry Marcus!
"Fascinating" as Mr Spock would say
![Very Happy :D](./images/smilies/icon_e_biggrin.gif)
The I2C chip can save some startup options, including a forced RAM-top. So the battery thing including a scrambled I2C RAM is very likely your problem.
- XorA
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Re: Aurora Minerva Boot Error
For me its because my brain translate mk to Markus (I have no idea why, maybe in another community there was one).mk79 wrote:2nd time I've read it in the forum today even, by different people! Most British brains for some reason cannot process my nameXorA wrote:Ooops 2nd time Ive done that I think!dilwyn wrote: Markus? Or did you mean Marcel?I literally had this exchange at QL meetings:
Hi Marcus!
Hi! And it's, Marcel.
Oh, sorry Marcus!
"Fascinating" as Mr Spock would say
The I2C chip can save some startup options, including a forced RAM-top. So the battery thing including a scrambled I2C RAM is very likely your problem.
Good to know about the RAMTOP thing. I can't see that obviously documented, would someone like to give me a pointer!
- XorA
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Re: Aurora Minerva Boot Error
Yes, I have read that but its not super obvious where RAMTOP is limited.
I am assuming its in the badly described D1 at boot section which seems to be stored in i2c ram?