Chris the Cranberry

[Chris!]

Time to get back into the Odyssey 2 scene. I'm going to make a new racing game in the style of Excitebike and MotoRodeo (more info on MotoRodeo for the 2600: https://atariage.com/software_page.php?SoftwareLabelID=1020)
I'm calling it Chris the Cranberry. Here is its title screen, all I have so far.


I got my Odyssey 2 out and it still works great.

[Chris!]

Added a timer to display during the race. It works fine on a real Odyssey 2 and O2EM but for some reason runs really slow on Homer.

[Chris!]

Figured out that that timer is incorrect. This version should have a better timer, but I had to sacrifice the hundredths digit.

[Rafael]

 

[Chris!]

Added the first obstacle: A big box.

[Chris!]

HELP!
Suppose I want to have the boxes be various y positions.
I have this code:

Code:

boxydata:
db 029h, 039h, 049h, 059h

add a,#boxydata & 0ffh
movp a, @a ;get byte
mov r1, a

mov r0,#000h ; pointer to sprite 0 Y pos in VDC
mov r7, #1
call copyspriteloop

It works good for the first position (029h), but I can't figure out how to advance the correct number in boxydata for it to read it and make the box be in the second position listed (039h) the second time.

Code:

copyspriteloop:
mov a,r1
movp a,@a ; get byte
movx @r0,a
inc r0
inc r1
djnz r7,copyspriteloop
ret

[Chris!]

I figured it out. I needed to add this:

Code:

mov r1,#obstaclenumber
mov a,@r1
mov r3,a

and change that other bit of code to this:

Code:

copyspriteloop2:
mov a,r3
movp a,@a ; get byte
movx @r0,a
ret

So now I might be able to design some rudimentary tracks now. I'd like some ideas for more stuff to put in. I already put in an item that when Chris runs over he gets a short burst of speed (the green arrow thingy.) Thoughts?

[Chris!]

Time for a little update, even though nobody downloaded the previous one. I'm still working on stuff.

[cjherr]

Nice! I like where this is going!

[Chris!]

Thanks!

Can someone with a PAL tv test this latest version? I only have an NTSC TV and an Odyssey 2 so I am wondering if the sprites disappear all the way off the screen when not used because I doubled their height.

[Chris!]

Don't need a PAL tester any more. I recoded it so I don't need to worry.
I also got rid of the title screen "music" and replaced it with a countdown at the start.

[Chris!]

The first track is done.

[Rafael]

Doesn't look too challenging

[Chris!]

Yeah, I know. Perhaps I won't finish this game after all.

[Nesrocks]

I have tested this twice, but I don't think my character is moving. I did start the game and the timer started counting but nothing seems to happen.