How to test my Amiga, and did I get Amiga 500 or 500 PLUS?

[mfilos]

I had exactly a bastard mobo like this which was an A500+ mobo with OCS Denise but with New Agnus and with Kickstart 1.3, 512KB soldered Chip and without the RTC circuit and Audio filter.

It's true that some Commodore A500's where shipped with the new mobo but without the extra stuff that actually categorize an A500 as a plus (RTC circuit, Kickstart 2.04, ECS Denise, 1MB Chip plus audio filter).

It's not so difficult to upgrade this mobo to a full A500+ but you need to put the ECS Denise, solder the rest 1MB Chip chips, and find some difficult to find decoupler for the RAM plus some RTC chip and some other caps/resistors for the audio filter circuit.

I tried to make this, but never actually made it. Imho it's easier to get an real A500+ mobo than try to make this a full one or keep it and treat is as an Rev6 mobo
Just keep it as it is as a rare bastard board from the Commodore era

[mfilos]

I don't have anything to do with Rev.8 mobos man (in fact I love a full Rev.8 mobo and I certainly prefer an A500+ from an A500 any day). I wish I could make my bastard board into one but I had some bad experience with it.

Mobo works, I putted the ECS Denise and Kickstart 3.1 and life was good.
I did all the neccesary jumper alterations and also soldered the new ram chips in place but hey... no extra RAM. I thought I'd need the decoupler chip, so I ordered one and still nada 1MB chip.
After those tries I stopped trying because maybe ram chips could be faulty or the decoupler so I couldn't tell nor had the time to try more combinations.

Good luck with your own mod mate, and keep us posted with your own experience.