Subject: Re: [stella] Help (Timing problems?) From: "Andrew Davie" <adavie@xxxxxxxxxxxxx> Date: Thu, 2 Aug 2001 08:57:54 +1000 |
> >> > 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. > I concur. Qb had an attract mode, as it is called, and it cost something like 10 bytes. Cheers A -- _ _ _| _ _ _| _ * _ _ , (_|| )(_|( (/_\/\/ (_|(_|\/(_(/_ ,~' L_|\ ,-' \ see my Museum of Soviet Calculators at ( \ http://www.taswegian.com/MOSCOW/soviet.html \ __ / Qb: the latest retro video game! L,~' "\__/ http://www.atari2600.org/qb.html @--> v ----- Original Message ----- From: "Glenn Saunders" <cybpunks@xxxxxxxxxxx> To: <stella@xxxxxxxxxxx> Sent: Wednesday, August 01, 2001 4:24 AM Subject: Re: [stella] Help (Timing problems?) > >> > 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: http://www.geocities.com/Hollywood/1698 > 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 > >MIME-Version: 1.0 > >Received: from [216.223.192.28] by hotmail.com (3.2) with ESMTP id > >MHotMailBD2FA83B0005400438CAD8DFC01C0FFC0; Tue, 31 Jul 2001 00:24:47 -0700 > >Received: (from majordom@localhost)by biglist.com (8.8.8/8.8.5/BL-2) id > >DAA10391;Tue, 31 Jul 2001 03:27:56 -0400 (EDT) > >Received: from mailgate3.cinetic.de (mailgate3.cinetic.de > >[212.227.116.80])by biglist.com (8.8.8/8.8.5/BL-2) with ESMTP id > >DAA10387for <stella@xxxxxxxxxxx>; Tue, 31 Jul 2001 03:27:51 -0400 (EDT) > >Received: from web.de (fmomail02.dlan.cinetic.de [172.20.1.46])by > >mailgate3.cinetic.de (8.11.2/8.11.2/SuSE Linux 8.11.0-0.4) with SMTP id > >f6V7Ns629955for stella@xxxxxxxxxxx; Tue, 31 Jul 2001 09:23:55 +0200 > >From owner-stella@xxxxxxxxxxx Tue, 31 Jul 2001 00:25:42 -0700 > >Message-Id: <200107310723.f6V7Ns629955@xxxxxxxxxxxxxxxxxxxx> > >Organization: http://freemail.web.de/ > >X-MIME-Autoconverted: from quoted-printable to 8bit by biglist.com id > >DAA10388 > >Sender: owner-stella@xxxxxxxxxxx > >Precedence: bulk > > > >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 | > > > > > >___________________________________________________________________________ ___ > >Jetzt und nur hier Ihr original PREMIERE WORLD SportPaket > >plus 100 Euro ExtraPrämie: http://premiere.web.de > > > > > >- > >Archives (includes files) at http://www.biglist.com/lists/stella/archives/ > >Unsub & more at http://www.biglist.com/lists/stella/ > > > _________________________________________________________________ > Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp > > > - > Archives (includes files) at http://www.biglist.com/lists/stella/archives/ > Unsub & more at http://www.biglist.com/lists/stella/ > - Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://www.biglist.com/lists/stella/
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