Originally posted by: Vectrex280996
Originally posted by: Cockroachcharlie
LOL. Man. I can see why people wanted to simplify it. Assembly is seriously a lot different than anything I have ever worked with so far. Again. It's just hard to grasp how number transferring produces these results. Almost like trying to visualize in pure binary. So now that I have the actual coding a little more in place, I should probably work more on the architecture and the specifics of memory locations?
You'll get used to the registers, there aren't too many so you'll get a good grasp on how they work the more you program.
Also, here's how I would do a "Hello World" program if you're interested (Basically what KHAN said in code form). It's covered in a later tutorial, because even simple things like that need to have you understand the registers and what they do.
LDA $2002 ;wake up PPU
LDA #$22
STA $2006 ;Write the hi part of the starting address to $2006
LDA #$00
STA $2006 ;and the second part.
LDX #$00
.hwloop
LDA helloworld,x ;Draws h, e, l, l, o, etc. on the background with $2007
STA $2007
INX ;x register makes the writing possible
CPX #$0B ;Do it 11 times
BNE .hwloop
helloworld:
.db $11,$0E,$15,$15,$18,$2F,$20,$18,$1B,$14,$0D
;The CHR goes like that.______0123456789ABCDEF
;That's just my way of using__GHIJKLMNOPQRSTUV
;using fonts on the CHR tho.__WXYZ.,-!?©:;'()
I think I am starting to see what you mean. I actually grasped a lot of the "what" in what you wrote. It's the "why" that is still elusive, but coming together. From a basic standpoint, some parts of memory act as temporary/permanent data holders, while others act as (sorta) switchboards. I think with a little more research into the hardware topic itself (both my books fail to cover such aspects, but then, both were written in 1980 for a specific board).
LOL. Sadly, in the class I took, as well as all studies, the actual hardware part was always where I was left with swirly eyes. But. My son and I are bound and determined to put a game onto our favorite console, so for once I have a reason not to just say to hell with it all. :-)
