If the game has the space left
over, it goes a long way to adding that little extra bit of retro
authenticity. It also performs a utilitarian function, namely
visually indicating when the game is over. Space Invaders a good
example of that. I like the way the game kinda still runs in that
game even though the game is over. It's like an
"afterlife" mode.
Thanks - part of my mission is to attempt to work within the constraints
that faced the original programmers - however, I may strip it out (or try
to optimize it) if my demo/game requires it.
I'm still trying to work within the 2k limit - that should not be a
problem due to my lack of time to devote to this.
BTW, much of the original Freeway code is disappearing or being
re-written - I don't want to give the list the impression that I am
intending to produce a derivitave work or just "cut and paste"
my way into a game.
I do plan to create and post a version of this "shell" -
hopefully will fill a gap for newbies in terms of some of the things not
covered in Bensema's playfield demo -
Table-driven horizontal postioning,Joystick/boundary detection, simple
sprite movement, etc...
Wade Brown
Systems Analyst
E-mail: wbrown@xxxxxxxxxxxxx
At 11:24 AM Tuesday 7/31/2001, you wrote:
BTW: I don't think a screensaver
mode is necessary any more. And it "wastes" a lot of valuable
space.
<<
If the game has the space left over, it goes a long way to adding that
little extra bit of retro authenticity. It also performs a
utilitarian function, namely visually indicating when the game is
over. Space Invaders a good example of that. I like the way
the game kinda still runs in that game even though the game is
over. It's like an "afterlife" mode.
GLENN SAUNDERS===============================
By Day - Web Developer -
http://www.eUniverse.com
==============================================
By Night - Producer - Cyberpunks Entertainment
Personal homepage:
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Cyberpunks Entertainment:
http://cyberpunks.uni.cc
From: "Thomas Jentzsch"
<tjentzsch@xxxxxx>
Reply-To: stella@xxxxxxxxxxx
To: stella@xxxxxxxxxxx
Subject: Re: [stella] Help (Timing problems?)
Date: Tue, 31 Jul 2001 09:23:55 +0200
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Wade Brown wrote:
> I am working on a "shell" that I can use to flesh out some
ideas I have -
> the idea being to have basic semi-reusable functions such as: b/w
color
> selection, screen saver timer, and score digits.
That's a good idea, if you want to start programming the 2600. Later on,
you will find, that often you need more specialized or optimized
code.
> BTW, I was trying to get a fairly optimal way to read diagonals from
the
> joystick - anyone out there see how I can improve this approach or
has a
> different take, I would really like to see...
The code below is a bit more compact than yours:
; check joystick:
lda SWCHA
asl
bcc .noRight
inc Player1X
bcs .withJoy
;3 always taken branch, saves 1 byte
compared to jmp
.noRight:
asl
bcc .noLeft
inc Player1X
bcs .withJoy
;3 always taken branch, saves 1 byte
compared to jmp
.noLeft:
asl
bcc .noDown
...
bcs .withJoy
;3 always taken branch, saves 1 byte
compared to jmp
.noDown:
asl
bcc .noJoy
...
.withJoy:
ldy
#0
; joystick moved
sty SaverTimer
.noJoy:
> I would especially appreciate any help in the
> area of boundary detection (i.e detecting when the player/enemy is
at the
> edge of the screen).
Here is a slightly better solution:
; check x-bounds:
; I LOVE to use constants, because that makes the code more readable (for
me:) and I can much easier change the parameters
LEFT_BOUND = 20
RIGHT_BOUND = 140
lda Player1X
cmp #LEFT_BOUND
bcc .outOfLeftBound
cmp #RIGHT_BOUND+1
bcc .inXBounds
lda #RIGHT_BOUND
.byte $2c
; opcode for bit.w, this hides the
next instruction
.outOfLeftBound:
lda #LEFT_BOUND
sta Player1X
.inXBounds:
You could also combine the joystick and boundary routines. This might
give you more optimal solutions. But that's mixing two different basic
functions and doesn't fit into your concept.
Have fun!
Thomas
BTW: I don't think a screensaver mode is necessary any more. And it
"wastes" a lot of valuable space.
_______________________________________________________
Thomas Jentzsch | ***
Every bit is sacred ! ***
tjentzsch at web dot de |
______________________________________________________________________________
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