I think it will be useful and bring more good ideas if I clarify a bit more the scope of my project, so here it is:
- I don't need hook actual SRAM as program or data storage memory, but I want an EMI/EMIF or whatever the marketing is calling now these external memory interfaces to be as close as possible (some glue logic may be needed) to those 6800/Z80 interfaces, practically address bus, bidirectional data bus and some RD/-WR or similar signals. A kind of request/ready signal will also be appreciated, the things I want to drive are really slow.
I wish to avoid any kind of demultiplexing or the need to add too much glue logic for the proper implementation.
- Why do I need such a bus: I have a lot of vintage and without modern equivalent devices that are designed for such a bus, and while of course I can do bit banging, reprogram the GPIO pins direction and other RPi/Arduino pfuscherai , I find these solutions disgusting and wish to avoid them if possible.
- Yes, yes, but what EXACTLY obsolete chips are these, so I can tell you that is all wrong, you don't do this you do it otherwise, "...user asks how to do X, but he actually needs to do Y and he (wrongly) believes he need to do X to get Y,
...", we've al seen the lame xkcwhatever lame cartoon...
- Still, what are you trying to accomplish, tell us
?
OK, here it is, I want to rape, plunder and destroy some wonderful vintage (but dead) TE and replace the anemic digital part with a bit less obsolete equivalent, getting rid of some unobtanium stuff in the process.
This is one of the main applications that I have in mind along others.
So after reading this you can actually recommend a modern MCU that fits the bill and is still average human solderable (no BGA or ultrafine flat pack), please let me know. Some of the proposed MCUs do look good, but more options the merrier
.
Thanks and cheers,
DC1MC