Subject: Re: [stella] Thrust v0.9 From: Thomas Jentzsch <tjentzsch@xxxxxxxx> Date: Sat, 17 Jun 2000 12:41:54 +0200 (CEST) |
"John K. Harvey" <jkharvey@xxxxxxxxxxxxxxxxx> wrote: >>I'm having problems making the game operate. >>Thrust, fire, and shield/tractor work, but I can't rotate. >>Does anyone else have this problem? >Yeah, me too. Currently I'm using PCAE 2.2. >Also, all letters in THRUST don't light up. The 'U' and >the final 'T' are missing. >Hmm... what's the deal with an illegal opcode (lax, was >it?)? Was this a >misprint for TAX, or is it something PCAE can't deal >with really well? What's it for? LAX is an illegal opcode which does LDA and TAX. In the scoring-display-routine (which also displays THRUST) i'm using LAX (ptr),Y to get the data faster into the X-register (5 vs. 7 clocks). This gives me the time to do the color-cycling. There are a few other places in the code (rotate the ship!), where illegal opcodes help me to save time or space. So you MUST use z26 www.whimsey.com/z26/z26.html) to play the game. PCAE (ignore) and Stella (crash) don't support illegal opcodes. If a real VCS can handle those opcodes (i can't test this, please help me), it's a problem of those emulators. Maybe illegal opcode were never used in other games. I don't know... I want Thrust to work on are real VCS, if someone would show that illegal opcodes are a problem, i'd change the code. If not, i think the non-working emulators could be fixed very easily. ===== Thomas Jentzsch | *** Every bit is sacred ! *** tjentzsch at yahoo dot de | __________________________________________________________________ Do You Yahoo!? Gesendet von Yahoo! Mail - http://mail.yahoo.de Yahoo! Mail auf Ihrem Handy? - http://mobil.yahoo.de -- Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://www.biglist.com/lists/stella/
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