Thanks for the heads up
I shall look for further info before I change things. it has a 60 Mhz crystal driving the Arm3 and FPA (on the upgrade board) so I shall make further enquiries.
Speaking of which
Old quote but Paul knows the innards of my machine better than I do -
Yes, the benefit of the ARM3 on board is that it has it's own clock so is somewhat decoupled from overclocking your motherboard.
paulv wrote:That's very cool...
@Andrew, when you read this thread... yes, you could do this to your ARM3 A3010 as you have the IFEL RAM board too....
What say you Mr V ?
What say all?
Sorry, old inside joke from a time where we went to an Xmas bash at Coombe Abbey.
I'd need to take a look at the schematics of the A3010 to refresh my memory but it's using a divisor from either a 72, 36 or 24MHz clock to achieve the 12MHz clock speed. Looking at your motherboard
there's a 24MHz and 36Mhz oscillator fitted with a 25.175Mhz crystal fitted too so between them they provide the standard clocks for VIDC and the sysclock may well be derived from the 36 or 24MHz clock. You can clearly see there were design ideas about adding a fourth oscillator to the PCB but the via's and traces were not added to your version of the motherboard.
Reading the A4000 hack, it seems that the "spare" socket comes into play when overclocking the machine so I'm thinking that the hack for an Adelaide A3010 would be quite different to that of the A4000, but still doable.
Essentially, you'd have to interrupt the circuit so that the 24MHz clock which would be used to clock VIDC and the motherboard at 12MHz would only drive the motherboard. You could then remove the 24MHz oscillator from the PCB and attach it to the VIDC clock MUX directly and stick a faster oscillator into the normal position on the PCB to overclock the rest of the motherboard. It would not be a pretty hack.
Of course, this is subject to reading the Adelaide based schematics but on first blush that's my guess.