-
Maze Mania - How did they do it?Hi, I was looking at the game "Maze Mania" by Hewson Consultants, written in 1989. The game can be downloaded from here [URL]http://www.worldofspec…
Now shall we start getting really clever and start scrolling screen areas around by simply using the I register and a few choice opcodes or maybe just leave it there for now. Yeah, let's leave it cos I really can't be arsed :D -
Fastest Block Drawing Code?Following on from my scrolling thread [URL="http://www.worldofspectrum.org/forums/showthread.php?p=351304#post351304"](http://www.worldofspectrum.org…
... ;351308]Following on from my scrolling thread [URL="http://www.worldofspectrum ... it from stack, just fill register pair with null and use ... -
48K games that don't work on a +2Not sure if there is already a thread about this but recently I've noticed some old 48K games will not run on my +2 - even in 48K mode. Examples are…
... game, but the 'snow' effect (setting I register between $40 and $7F ... a 48K machine with the snow effect. But hey, I've ... -
Snow on screen of 48K Speccyok you wizards I fixed up my 4116 ram issue as Winston and McLeod advised me before by replacing with 4164's.... all I could find here in Singapore (…
... the "snow" is white... I have only ever set I register in ... issue would surely make black snow...
Which leads me ... -
Tutorial - learn machine code in 30mins[B][I]Message from the moderators[/I] - bigjon has requested that readers' attention be drawn to a better version of this tutorial, one which is easi…
... address held in the HL register pair). z80 instructions that refer ... the MSX fairly crap at scrolling, an operation involving a full ... -
More colours II (Was: Most popular new features?)The suggested 4xCLUT multi-colour solution never took off.
... information so an i/o register is used to store PAPER ... bit longer until sprites or scrolling hw is added :D -
Framerate of Spectrum gamesI was reading a bit about framerates in modern games and it got me wondering about the Speccy. First off I'd hoped to find what framerate my old gam…
... sprites or swapping out colour register values, the game code can ... it's rather poorly implemented scrolling, thirty scanlines of which aren ... -
just thinking about ...compo for zx 16k ? anyone ?
... where to point the I register:
In RAM > ... lower RAM: gives you ULA snow.
In the empty space ... -
Games not compatible with real grey +2There are many threads about Spectrum+3/2A incompatibility issues but what about grey +2? I've found that games like Marauder and Skate Crazy don't w…
... the I register points to 64-127 then you get snow and ... -65535, so setting the I register to 192-255 can also ... problem (they have the I register set to 240). -
Games not compatible with real grey +2There are many threads about Spectrum+3/2A incompatibility issues but what about grey +2? I've found that games like Marauder and Skate Crazy don't w…
... the I register points to 64-127 then you get snow and ... -65535, so setting the I register to 192-255 can also ... -
Mr Do! ?Not exactly a new idea (at least twenty-seven years old now :-o), but how about a port of Mr Do! to the Spectrum? There was never an official one, ev…
... , avoiding the need for horizontal scrolling. I'm undecided as to ... (the single-byte ones, with register operands) take 4 T-states ... aren't affected by I-register contention, so it can use ... -
Mr Do! ?Not exactly a new idea (at least twenty-seven years old now :-o), but how about a port of Mr Do! to the Spectrum? There was never an official one, ev…
... , avoiding the need for horizontal scrolling. I'm undecided as to ... (the single-byte ones, with register operands) take 4 T-states ... aren't affected by I-register contention, so it can use ... -
ula bookula book is here: [url]http://www.zxdesign.info/book/[/url] can i post sam coupe stuff here - she kind of is a speccy if you stuff the speccy rom i…
... think I used to think snow was a TV quirk but ... way that setting the I register to 40h-7Fh was not ... same value to the R register!
Yes! POTW ... -
Pretty CrashesTo make a 48K spectrum crash spectacularly and beautifully enter the following into basic. Also works on a 128k in 48k mode though not quite as prett…
... the I register to the RAM will cause the ULA snow effect ... -
emulatorsplease help can we see clearly which emulator emaulates which hardware is there any that has a pc function key for the mulitface nmi button and the +…
... now dot crawl and ula snow - though these are not the ... the code with a full register dump on the PC side ... -
Help?Hi All, I wonder if anyone has a few minutes to look at this bit of code I'm working on. I'm trying to move to sprites and want to do it with a scr…
... ) was just scrolling 0-255 through the L register and starting again ... -
Help?Hi All, I wonder if anyone has a few minutes to look at this bit of code I'm working on. I'm trying to move to sprites and want to do it with a scr…
... ) was just scrolling 0-255 through the L register and starting again ... memory (rather than the actual register) which was getting incremented and ... your original code the HL register pair contained the address of ... -
Official CSSCGC 2011 Competition ThreadHello fellas. The site is up and running. We are already accepting submissions. [url]http://www.mojontwins.com/csscgc2011/[/url] Rules, info, and e…
... the behaviour of the "MEMPTR" register affects the game logic. Very ... />
Hopefully your next game, Snow Clearing Simulator, will be just ... -
Official CSSCGC 2011 Competition ThreadHello fellas. The site is up and running. We are already accepting submissions. [url]http://www.mojontwins.com/csscgc2011/[/url] Rules, info, and e…
... ;523039]Hopefully your next game, Snow Clearing Simulator, will be just ... , set the [b]I[/b] register to something in low RAM ... -
Print TextHow do i print text on the bottom left row(memory location in attribute 23295) of the screen in assembly? I understand the parts better on paper and …
... each score each time, then scrolling up and out, you need ... full details, uses the A register contents as part of the ... -
CSS has been Rogeredcomp.sys.sinclair has just been rogered. I make do with a summary when anything happens and activity shot up on Friday. Turns out to be the usual qu…
... is what i thought ula snow was whereas that is described ... /> has anyone seen the hardware scrolling the orgininal cpc had(not ... -
CSS has been Rogeredcomp.sys.sinclair has just been rogered. I make do with a summary when anything happens and activity shot up on Friday. Turns out to be the usual qu…
... is what i thought ula snow was whereas that is described ... /> has anyone seen the hardware scrolling the orgininal cpc had(not ... -
CSS has been Rogeredcomp.sys.sinclair has just been rogered. I make do with a summary when anything happens and activity shot up on Friday. Turns out to be the usual qu…
... is what i thought ula snow was whereas that is described ... /> has anyone seen the hardware scrolling the orgininal cpc had(not ... -
ISR's in lower ram, a.k.a. the snow effect - did any game or demo ever use this?Hi all I've been curious to see what the 'snow effect' looked like in real life for a while now so today I wrote a quick IM 2 ISR in lower ram to wi…
... hardware character scrolling as one of the tests for the snow effect ... -
ISR's in lower ram, a.k.a. the snow effect - did any game or demo ever use this?Hi all I've been curious to see what the 'snow effect' looked like in real life for a while now so today I wrote a quick IM 2 ISR in lower ram to wi…
... hardware character scrolling as one of the tests for the snow effect ... possible to have a controlled snow displacement. I know woody's ... tests, you can freeze snow on screen.
I ... enhance multicolour pictures by using snow effect? -
New Game! Maritrini, Freelance Monster SlayerAfter experiencing the sweet taste of success, Maritrini woke up one fine day in a mess of bed sheets and with the biggest hangover she could remembe…
... models don't suffer the snow effect. 48, 128k+ and +2 ... where I can test this snow effect? I've produced a ... needs to set the I register (and table) for IM 2 ... -
Double Dragon Remake: The Development ThreadOk guy's, so this is the new thread that will be focusing on Jim Bagley's development of the Double Dragon remake that was first proposed by myself a…
Some quote about snow effect
[QUOTE]
... models don't suffer the snow effect. 48, 128k+ and +2 ... needs to set the I register (and table) for IM 2 ... -
New projectHello, you can see my new project for Spectrum in this link. I think that I finish it in few weeks. I hope you like it [URL="http://www.youtube.co…
Wow, Snow Bros! A brave attempt in ... try to improve animation and scrolling a little bit. It's ... -
Maritrini and Cray 5 loading problemsHas anyone else here had issues loading either of these on a 128k? No matter what I try, both these games refuse to load properly. I can get both t…
... to the ULA snow one, namely that the IR register pair gets ... -
Strange behaviour in real hardware but not in emulatorsWell, at least not in any emulator I've tried. I've been reported by fellow forum member Macc that both our Maritrini Monster Slayer and Retroworks'…
... are disabled.
ULA snow is (roughly) when the ULA ... it's just the I register which causes the problem. Your ... , as long as the I register is not $40-$7F (or ... , you should change the I register to a safe value (making ...
