Which were the first 8051 derivatives with multiple dptr? AFAIK the Siemens 80C517 was the first with 8 dptr. I've read that AMD had an early dual dptr vairant, but couldn't find a datasheet yet. Which device was the first to use the following scheme: DPL1 at 0x84, DPH1 at 0x85, DPS at 0x86.0?
Philipp