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<1…24252627282930…34>
  • A scrolling starfield - help needed!I have been messing on my speccy again recently and tried to do a scrolling (parallax - maybe) starfield. I know how to scroll using machine code but…

    ... br />
    LD HL,STARPOS_X ; store X position of star

    LD HL,STARPOS_Y ; store Y position of star
    LD H,A ; store the result in h

    POP HL ; retrieve pointer screen byte

    XOR (HL ...
    Digital Prawn Digital Prawn December 2008 Development
  • A scrolling starfield - help needed!I have been messing on my speccy again recently and tried to do a scrolling (parallax - maybe) starfield. I know how to scroll using machine code but…

    ... br />
    LD HL,STARPOS_X ; store X position of star

    LD HL,STARPOS_Y ; store Y position of star
    LD H,A ; store the result in h

    POP HL ; retrieve pointer screen byte

    XOR (HL ...
    Digital Prawn Digital Prawn December 2008 Development
  • Usr 0 ?I'm not sure I've ever seen this explained before, but why do some programs (only demos, as far as I can see, so far) need USR 0 mode when run on a 1…

    ... , but it is good to store the current Bank number somewhere ... if I do the "Interlace" screen-switching on Interrupts, so the ... current screen Bit is just switched using ...
    LCD LCD January 2009 Sinclair Miscellaneous
  • ZX archive high-resolution dreamI was thinking today how great it would be to have a high resolution archive resource of ZX advertisements and photographs from magazines, as opposed…

    ... to be resized for proper screen display.

    [quote=SteveP ... ? Going to great lengths to store top quality scans of magazines ...
    rahtgaz rahtgaz January 2009 Sinclair Miscellaneous
  • Help designing a Jonathan Cauldwell game !Going to Byte Back retro show next March They've challenged the homebrew developer Jonathan Cauldwell to create a new Spectrum game in just one day …

    ... :

    1. You can store a piece, to use at ... three pieces, shown on the screen.

    3. You score ... on until you fill the screen vertically. Aside from the time ... reach the top of the screen, have a Level mode, where ...
    ewgf ewgf January 2009 Games
  • Jetpac questionHi all, I just bought a copy of Jetpac off of Ebay and I'm having problems. To start, I'm trying to play it on an issue 2 Speccy with Interface 1, 2 …

    ... />
    ;PseudoRandom Memory Fill
    ;Store end of scan in C ... /> RandomFill0
    LD HL,(SEED16) ; Store the SEED used on this ... ,COLUMN=E
    ;
    ; On screen QP_SCREEN (default 16384)
    ; write ... A,E ;Add column and store in C
    LD C ...
    Digital Prawn Digital Prawn January 2009 Games
  • Understanding the StackSorry folks. I guess I'm going to be a pain for a little while. Hope it's ok with everyone. I'm currently studying the stack and wrote the little pr…

    ... bunch of data (like dummy screen in games).

    Stack ... />
    DrawTrees
    PUSH BC ;store registers
    PUSH HL
    Ralf Ralf January 2009 Development
  • how to reflect a byte's bit-pattern in assembly?I'm trying to use 16 pixel-wide graphics which are symmetrical around the vertical, i.e. if the left byte is 01001110 the right byte will be 01110010…

    ... most
    "print-graphic-to-screen" routines. (And printing two bytes ... you have enough memory to store pre-shifted mirrored versions of ...
    evilpaul evilpaul January 2009 Development
  • Defender of the crownI have checked recently the Spectrum version of this well known, great game and the Spectrum version is strange. [url]http://www.worldofspectrum.org…

    ... raiding. The game does not store the data of shires and ... time. However there are many screen in the game, so Tamas ... , the girl saving screen and the winning screen in this order. We ... -to-tape. Unfortunately the winning screen disappeared and I don't ...
    G.o.D. G.o.D. January 2009 Games
  • MultichromeIt turns out that multichrome, and other screen modes, are emulated in Fuse and Eightyone via ZX Spectrum SE emulation (which is similar to the TC214…

    ... SE has the two Timex screen offsets (0x0000 and 0x2000) in ... a total of 4x normal screen areas or 2x hi-colour ... of R/G in one screen and G/B in the ... options as they don't store Spectrum SE machine information. I ...
    Mister Beep Mister Beep January 2009 Development
  • File formatsAll this format talk has got me thinking, what's the difference between them all? you know SNA, Z80, Tap, Tzx etc.

    ... Z80 are snapshot formats. They store what's in the Spectrum ... TZX are tape formats. They store the data on the tape ... get to see the title screen. TZX is obviously the format ...
    Matt_B Matt_B February 2009 Emulators
  • Need a pointer to using the spectrum calculator from MCHi all, Can anyone point me to a good resource on using the spectrum calculator stack from machine code? I need to work out the number of seconds f…

    ... 04h ; multiply
    DEFB 0C5H ; STORE IT IN CAL MEM 5 ... fpprint ;print result on the screen! - CLEARS THE STACK


    DEFB 0C4H ; STORE RESULT IN CALC MEM 4 ...
    dickydodds dickydodds February 2009 Development
  • Need a pointer to using the spectrum calculator from MCHi all, Can anyone point me to a good resource on using the spectrum calculator stack from machine code? I need to work out the number of seconds f…

    ... .

    Also when you store a stack value in a ... out)

    DEFB 0C4H ; STORE RESULT IN CALC MEM 4 ... BC) and output on the screen?

    I hope this ...
    Geoff Geoff February 2009 Development
  • "We don't understand computers but we've got ?3.58 million to spend on them....... so lets find a problem to solve with the money" is a good translation of the article at: [URL]http://news.bbc.co.uk/1/hi/technology/7886754.s…

    ... losing significant information - gif can store the flashing state of pixels ... ?

    You cannot store these files as anything but ... sort to accurately display speccy screen images.

    [quote]< ... in mind that you cannot store speccy graphics in a ...
    Dunny Dunny February 2009 Chit chat
  • "We don't understand computers but we've got ?3.58 million to spend on them....... so lets find a problem to solve with the money" is a good translation of the article at: [URL]http://news.bbc.co.uk/1/hi/technology/7886754.s…

    ... sort to accurately display speccy screen images.[/quote]

    Yes ... no different than aiming to store a physical copy of every ...
    ewgf ewgf February 2009 Chit chat
  • Spin problems/issuesI am running Spin 0.666 and have noticed a few issues (some are bugs, some might be just me). I am using Vista sp1 (yeah I know!), and I've seen Dunn…

    ... incbin as a method to store 3 basic files and 1 ... /> The code file is a screen manipulation utility.
    After assembling ...
    jp jp April 2009 Emulators
  • Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …

    ... you need to display a screen after some event, but don ... , then you can show your screen, and then wait for a ... so you use A to store the high byte, and specify ...
    bobs bobs April 2009 Development
  • SnakeMan XLBased on [URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0018323&loadpics=3&model=spectrum"]SnakeMan[/URL] the Minigame from 2007 I got the id…

    ... to be scrolling the whole screen in characters, why not make ... can use my idea to store the connections, but in display ...
    Dr BEEP Dr BEEP April 2009 New game ideas
  • 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…

    ... source address and the destination screen address. The SP is pointed ... Interrupts
    LD (spstore),SP ; Store Stack Pointer
    LD SP ... first 2 bytes are the screen destination, the next 2 are ...
    3. Copy BackBuffer To Screen
    robpearmain robpearmain May 2009 Development
  • 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…

    ... /> ; hl = Graphics address
    ; de = Screen address
    org 08000h
    pop bc

    ; Store in screen position
    ld (hl),e ...

    ; Work out next screen line
    NextPixelLine:
    ld ...
    robpearmain robpearmain May 2009 Development
  • 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…

    So, don't store your screen buffer in the ... the Spectrum screen memory is laid out. Store it line ... copy each line of the screen buffer to the display, ... fetching the screen address that each line ... could even make your screen buffer bigger, so you ...
    joefish joefish May 2009 Development
  • 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…

    ... 351348]So, don't store your screen buffer in the same ... the Spectrum screen memory is laid out. Store it line ... routine to find the screen address for the next ... [code]
    ; Work out next screen line
    NextPixelLine:
    ld ...
    Alcoholics Anonymous Alcoholics Anonymous May 2009 Development
  • 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…

    ... to the Spectrum Screen layout, of course. The screen address could be ... ;351348]So, don't store your screen buffer in the same way ... as the Spectrum screen memory is laid out. Store it line by ... to the display, fetching the screen address that each line has ...
    robpearmain robpearmain May 2009 Development
  • Image to ZXSpec 1.0Hi, I've written a piece of software (still not finished) that outputs any kind of image onto a Spectrum having being converted on a PC. It takes a…

    ... the frame in place on screen. I think peek/poke can ... know... but assuming we can store at 8 scrs in 128K ...
    brownb2 brownb2 May 2009 Sinclair Miscellaneous
  • Image to ZXSpec 1.0Hi, I've written a piece of software (still not finished) that outputs any kind of image onto a Spectrum having being converted on a PC. It takes a…

    ... the frame in place on screen. I think peek/poke can ... know... but assuming we can store at 8 scrs in 128K ... does not draw the complete screen. Anyway, delta compression cannot be ...
    LCD LCD May 2009 Sinclair Miscellaneous
  • Brand new Horace GameWe could think on how should the next Horace Game be, taking in account that the past three are mixtures of old, well established classic arcade game…

    ... and thinking on how to store all the game data. Then ... going rambo and store every char in the screen, then compress every ... screen and create a nice ...
    na_th_an na_th_an May 2009 New game ideas
  • Best way to store vector images in Sinclair BASIC?Let's forget for a moment that Sinclair BASIC is slow. If I have a picture made entirely of vector images, what would be the best way to store that d…

    ... QUOTE=Dr BEEP;352692]Just store 50 as 178 and - ... ; 128. Now you can store any number from 127 to ... />
    I suggest you store your vector data not in ... more. We can easily store each PLOT or DRAW command ... an absolute position on the screen.

    Angle: ...
    BloodBaz BloodBaz May 2009 Sinclair Basic
  • Brand new River Raid remake?one of my friend is trying to make a riverraid remake on flash just to have fun, I checked zx spectrum port of river raid. it is bad, really bad, jer…

    ... for every line of the screen - no time left for loop ... can be pre-setted before screen rendering starts (it can be ... lift up one value and store it seven times) and you ...
    Fikee Fikee May 2009 New game ideas
  • Rainbow Generator for 48K Spectrum using PUSHThis is what I came up with from [B]gasman[/B]'s suggestions. It's stable in ZXSpin and ZX32 simulating a 48K Speccy. Anyone like to try it on the …

    ... attributes in the MODE 2 screen area.

    ; -----------------------------------------------------------------------------
    store routine
    report_j equ ...
    push de ; store character address
    call ...
    chev chev May 2009 Development
<1…24252627282930…34>

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