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.
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
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 name I literally had this exchange at QL meetings:XorA 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!
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.
- 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 name I literally had this exchange at QL meetings:XorA wrote:Ooops 2nd time Ive done that I think!dilwyn wrote: Markus? Or did you mean Marcel?
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?