[stella] how tos

[Glenn Saunders <cybpunks2@xxxxxxxxxxxxx>]

At 12:45 PM 9/24/2001 -0400, you wrote:
<<
lso i dont see how the colors are done. like the series of colors able to 
be used . i know the PC has 256  how many does the 2600 have 8 ,16??? also 
do you know how the color is done? these are minor
<<

You should probably read the Stella programmer's guide first for these 
sorts of questions.

Just remember that what you see on the screen is the result of a kernel, or 
series of lines of code that builds the screen one line at a time.

If you want to draw a box programmatically, you'd do something like this 
(assuming playfield in reflect mode).  This should work:

LDA #%11111111
STA PF0
STA PF1
STA PF2
WSYNC
WSYNC ; the 2600 repeats whatever it did in previous scanlines unless you 
change the registers.
WSYNC
WSYNC
WSYNC

LDA #%10000000
STA PF0
LDA #%00000000
STA PF1
STA PF2
WSYNC
WSYNC
WSYNC
WSYNC
WSYNC

LDA #%11111111
STA PF0
STA PF1
STA PF2
WSYNC
WSYNC ; the 2600 repeats whatever it did in previous scanlines unless you 
change the registers.
WSYNC
WSYNC
WSYNC


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