ACA500 Plus And ACA1221-LC not working

Thanks for the feedback - you may even be able to run the ACA1221ec at 42.5MHz with the CA-PSU. A small passive heat sink on top of the CPU might be required, but 68ec020 CPUs with the right mask set are surprisingly fast if they get exactly 5V (not 4,95V).

Heat in the PSU should really be no concern with the CA-PSU, as the amount of heat generated in there is a fraction of what other power supplies do. That's really a difference you can *feel* (well, apart from the fact that it's working stable now).

A little bit off topic but I can fry an egg on my old psu's, but that is no longer possible on the new ca-psu.

Quote from Jens

(...) you may even be able to run the ACA1221ec at 42.5MHz with the CA-PSU. A small passive heat sink on top of the CPU might be required (...)

Will this apply to the ACA1221lc too?

Quote from mariovieira

Will this apply to the ACA1221lc too?

The ACA1221lc can "only" be clocked to 40MHz, but the big difference is that it has a faster memory controller. The ACA1221lc is faster at 40MHz (7430 Sysinfo-Dhrystones) than the ACA1221ec at 42.5MHz (just 6401 Sysinfo-Dhrystones). Further, the ACA1221lc is shipped with a small glue-on heat sink by default.

If you just want to know about the CA-PSU having an influence on overclocking success, then the answer is a clear YES. We did find that precise voltage at the A1200 main board is key to overclocking success. Too low voltage will limit the frequency, but too-high voltage will also limit the CPU speed, as with higher voltage, you always get more heat in the CPU. So the key is highest precision on 5V regulation, which is only possible with cable drop compensation - the unique selling feature of the CA-PSU. Note that this is not a guarantee, though: Overclocking is not a guaranteed feature, neither for the ACA1221lc, nor for the ACA1221ec, and you also don't get this guarantee with the CA-PSU.

However, there's always the possibility to ship things back to us for a refund. Doesn't happen very often - once installed, people discover that a lot of problems are gone with a proper power supply and a new accelerator with IDE speeder

Thanks Jens. I’m sure I’ll be happy with what I bought. At least until you release new A1200 accelerators

Quote from MikeVee

Or is there something else I can try?

Next step would be to send it here - please read this article before sending anything.

Quote from MikeVee

Thank you Jens, I will send out this week.

Just to give "yet another" hint: You may feel that you've bought the CA-PSU for nothing. Sending back the ACA1221 for repair is also a chance for you to execute your right of revocation and get the money back for it.

The card has already been repaired, but since neither DHL, nor Parcel One are taking any shipments for the UK or Ireland, shipping this back will have to wait.

I would have loved to ship this back before the new Brexit regulations, but we need to wait until your government lifts the restrictions that were implemented due to the new Covid strain.

Quote from MikeVee

Out of interest what was wrong with it?

Just a dead CPLD - this happens a lot with known-bad PSUs, so I'm happy that you decided to keep the CA-PSU.

Neither DHL nor Parcel One take shipments to the UK right now.

Was there any delay due to customs? I remember we pushed it out with a zero-invoice and a standard customs declaration, which implies "no VAT due here", so we've been able to ship despite our (so far) missing UK VAT registration.