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Why not a 65816? That gives you the 6502 compatibility and a larger address space mode when you want it. In a way, an anemic CPU makes sense if you go back to
by hakfoo 5y ago
Why not a 65816? That gives you the 6502 compatibility and a larger address space mode when you want it.
In a way, an anemic CPU makes sense if you go back to the old Commodore model of smart peripherlas. You don't need a lot of CPU horsepower, for example, if you can communicate with the mass storage/network card/etc at a high level and it just DMAs into place.
- cmrdporcupine 5y agoThe bus de-multiplexing with the 65816 is a pain for amateur hobby stuff. A W65C265S is worth looking at, tho it has some annoying masked ROM shipped on it you have to work around. It's basically an 65816 + UARTs + PIA + other stuff all packaged together. It has a boatload of pins which can be programmed to be either GPIO or the full address bus of the 65816 (instead of having demultiplex them like on the real 816). Comes in PLCC format, which is relatively hobbyist friendly as you can get adapters for breadboard, and it can be done thru-hole. Only downsides I found are the onboard ROM (which you can shortcircuit around I believe) and its maximum bus speed is 8mhz, lower than the 14mhz of the 65816.