look DTL-H2500 they use a lot different made CXD8530QC and any one know what it mean the right [ ] [ ] [ ] mark ? please share you one H2500 let's reference
I suspect the reason there are so many variants is simply that it was the same chip that was used on the majority of the PU-8 retail boards (between -2x and -4x, IIRC) and would have been produced in very large quantities from multiple sources. I have no idea what those delta markings on the end of the date code are, but they are common of chips made by LSI logic.
