SNASM: 65816 support....

I've been adding more addressing modes during lunchtime, so now I can do full 16bit immediate mode stuff. This also means I had to put in 8/16 bit flow control using new LongA and LongI, so you can now do commands like this!

        LongA   off
        LongI   off
  
        lda  #$ff
        adc  #$55
        and  #$fe
        cmp  #$12
        eor  #$55
        ora  #$55
        sbc  #$55
        bit  #$55
 
        ldx  #$23
        cpx  #$55
        ldy  #$23
        cpy  #$55
 
 
        LongA   on
        LongI   on
 
        lda  #$ffff
        adc  #$5125
        and  #$fe34
        cmp  #$1112
        eor  #$5544
        ora  #$5555
        sbc  #$5566
        bit  #$5532
 
        ldx  #$2312
        cpx  #$5542
        ldy  #$2363
        cpy  #$5513

Great fun!! I found out from the forums on Lemon64 that I can happily run my SuperCPU on my C128 in C64 mode without fear of blowing it up, so I can probably start to test some of the output soon.

I was thinking of doing a bitmap scroller an actually blitting the bitmap on each frame - which at 20Mhz, should only take around 1/5th of a frame!! wow thats fast... I could then also do software sprites on top of that! The great thing being that the sprites would be much quicker (aside fom the 20Mhz stuff) since I dont have to copy character data around - AND you wouldn't be limited by the character set either -its a bitmap! Colour would also be possible with this as well I guess... and thats not even thinking about C64 hardware sprites yet either!

Theres surprisingly little added to the 6502, a couple of addressing modes (and I'm doing 24bit Absolute addressing just now), and a few extra instructions that take no effort at all really. So this shouldn't take that long at all to finish this....

Edit: Thinking a bit more about this....I really need to update my C64 emulator to allow 65816; development would go much quicker if I had an emulator to run it in... I'm not sure how much effort that would be, I've not looked at it in years - since I put it on the PS2/XBox really.