what differences between the w65c816sxb and w65c02sxb

[dderny]

what differences between the w65c816sxb and w65c02sxb ?

I tried the w65c816sxb I'm so deceived that I'm thinking to trash it and buy the w65c02sxb

I found the board nice for it's speed, but I found the compiler and debugger useless
and I have problems with the w65c816sxb in emulation mode (while crossing $FFFF)


except for the processor I will find the ACIA, PIA, VIA at the same place ? and an usb uart fifo connected to a via ?
I'm thinking to use it with my own firmware, cc65 or 64tass

thanks for your advices

[BigEd]

(If you have something you no longer want, there might be someone here happy to accept it...)

[BitWise]

I suspect you'll have largely the same issues with the 65C02SXB but the page wrapping will work as you expect.

The 65C816 is best thought of as a completely different CPU rather than as a suped up 6502. Having 16-bit registers completely changes the way you access memory and you are not so dependent on zero page. The WDC C compiler for example overlays the direct page onto the stack to provide quick access to function arguments and locals, not its traditional use at all.

I have some projects on GitHub that program the 816SXB in assembler using the WDC tools that you could use as a starting point. I have been meaning to put up a C demo but I have too many other things going on at the moment to do that right now.

Of all the SXB boards I think the W65C265SXB is the best. Its has a built in monitor (which can be disabled by your code if needed) with S28 SREC download (so you can use any assembler that outputs S28 files - like my one does). It is much easier to add more RAM to (just a chip and some wires) and its cheaper.