Super agnus adapter fur a500 rev 6
 

So for the rj1307 (2mb agnus) [https://www.amibay.com/showthread.ph...00-Amiga-CDTV] I used the following memory: HM514260AJ8 (262, 144-Word x 16-Bit Dynamic Random Access Memory)

And I bought cheap 74f00 and 74F139 from ebay. China/HK.

This is for my rev 6. Other than the difference in memory the components are all in place.

I have soldered the module in place and in the correct orientation. When I boot, I see only 0.5 chip.

I made sure jp2 was bridged across the top and the trace is cut from bottom to mid. Jp7a also has had bottom two trace cut.

I guess it is either

. The memory is not compatible or not working
. The Chinese chips are all lies
. Bad soldering

I doubt it's the mem because I bought that here from a seller. It was originally intended for back up a1200 2b memory but I assumed it would work.

Regards.

Just random thoughts. I am not familiar with that adapter. Have you contacted the seller?

Make sure you are using the correct 8375. They are not all pin compatible. I did not see the Agnus part number mentioned in the BOM. Maybe its shown on the board. Near as I can tell, the project is not documented in a useful way. Did you get any documentation with your purchase?

You need to check the data sheets to see if they are compatible with the defined parts.

Unlikely. Those are very common logic ICs. They could be defective, though.

Likely if you are not proficient at SMD technique. You need review the schematics and check continuity with a multimeter. Bad solder joints can be tough to spot or intermittent.

You need to be careful, there are some SOJ RAM chips that have same footprint but are 3.3v - these will not work, You need 5V, beside of that, check SMD Pins under the microscopescope, a mistake can be done easily at this stage of assembly.... Have built a lot of them in the past:
https://www.amibay.com/showthread.ph...light=Megachip