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<1…10111213141516…34>
  • Routine for clearing screenI was looking for a 'nice' way of clearing a screen of graphics in Z80. After a ridiculous amount of time mucking around, this is the best and most …

    ... ://en.wikipedia.org/wiki/Linear_feedback_shift_register]Linear feedback shift register[/url]).
    code, written by yours truly, to ...
    Arjun Arjun March 2012 Development
  • Routine for clearing screenI was looking for a 'nice' way of clearing a screen of graphics in Z80. After a ridiculous amount of time mucking around, this is the best and most …

    ... ://en.wikipedia.org/wiki/Linear_feedback_shift_register]Linear feedback shift register[/url]).[/QUOTE ... haven't fully digested the code yet. This might be an ...
    Morkin Morkin March 2012 Development
  • BorderTron 3000A little bit of speccy-related fun for a Friday afternoon... I've knocked together a program for Windows which I've called Bordertron 3000 (a suitabl…

    ... I just do a big, linear bunch of "OUT (c),r ... wide).

    There is code in there to slightly "optimise ... about the size of the code produced :)


    [QUOTE ... way of cutting down the code size a little -- essential for ...
    ccowley ccowley April 2012 Announcements
  • Byte-order backbufferThis is a tool for Z80 coders who wish the Spectrum screen had a serial layout. It runs as an interrupt mode 2 service routine and uses POP and PUSH …

    ... look at my POP/PUSH code from the [I]River Raid ... ]nrolled [B]N[/B]on-linear [B]C[/B]oloured [B ...
    joefish joefish April 2012 Development
  • What if there was no memory or space limitation?What if there was no memory or space limitation? We've had topics about the limitations of the Speccy's hardware, topics where we discussed how good …

    ... because processes get large linear address spaces. You can ...
    Next consider executing code in a bankswitched environment. When ... been replaced with the print_string code.

    You ... check whether the destination code is currently banked in ...
    Alcoholics Anonymous Alcoholics Anonymous May 2012 Sinclair Miscellaneous
  • Need to scroll one column using m.c.I've used many of the available routines to scroll the entire screen in any direction, but I'm not being able to find one that would allow me to scro…

    ... else. Does that mean the code still needs changes?
    [/QUOTE ... routine as vram is not linear. maybe enough is to check ...
    ub880d ub880d May 2012 Development
  • Need to scroll one column using m.c.I've used many of the available routines to scroll the entire screen in any direction, but I'm not being able to find one that would allow me to scro…

    ... value after moving.

    [CODE]
    cpu z80undoc
    relaxed ... loop

    ret
    [/CODE]

    but as i ... easier as attribute area is linear.
    ub880d ub880d May 2012 Development
  • Question about 2-channel beeper musicI confess I haven't tried all the available beeper utilities and software. I always found music software confusing and trackers are not for me. I kno…

    ... work with BEEP in a linear form. No patterns, ornaments and ... same time. Ideally the machine code routine would allow me to ...
    zxbruno zxbruno May 2012 Development
  • Screen routinesHello. For my games I?m using the sprites routine method of a screen buffer and when I finish to print all the sprites I dump all the buffer in the …

    ... case, if there is any code to execute between 0 and ... screen. Start updating (in a linear, top to bottom fashion) the ...
    Hikaru Hikaru May 2012 Development
  • Screen routinesHello. For my games I?m using the sprites routine method of a screen buffer and when I finish to print all the sprites I dump all the buffer in the …

    ... case, if there is any code to execute between 0 and ... screen. Start updating (in a linear, top to bottom fashion) the ... , or do a bit of code then wait for IN A ...
    R-Tape R-Tape May 2012 Development
  • Screen routinesHello. For my games I?m using the sprites routine method of a screen buffer and when I finish to print all the sprites I dump all the buffer in the …

    I made this code more than 2 years ago. ... .

    The buffer is linear, so updating it should be ... , but since the buffer is linear, going down a line is ... adding the width. And the linear buffer may have invisible zones ...
    Metalbrain Metalbrain May 2012 Development
  • 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 …

    ... of info will complicate the code considerably.[/QUOTE]

    ... plus extra constant time code due to code complication be paid back ... case qsort performance. The code has been written so that ... elements can be done in linear time, after all. :)
    < ...
    Patrik Rak Patrik Rak June 2012 Development
  • Xor-shift random number generator for Z80[QUOTE=Patrik Rak;320244]Come on, people, [URL="http://www.jstatsoft.org/v08/i14/paper"]xor-shift generators[/URL] devised by Marsaglia, that's the w…

    ... . However, if you check the code, you can see that if ... we know that the shuffle code goes through all those values ... leads to the shortest Z80 code, and implemented that.

    linear congruential generators fail about twice ...
    Patrik Rak Patrik Rak July 2012 Development
  • BIFROST* ENGINE 1.2 released!Another improved version of the BIFROST* ENGINE is now available! Download it here: [url]http://www.worldofspectrum.org/infoseekid.cgi?id=0027405[/u…

    ... haven't shown anyone the code. I can do 24-character ... fairly easily now with looped code and a moveable buffer pointer ... 's still copying from a linear buffer. Using LD/PUSH it ...
    joefish joefish July 2012 Brand new software
  • real value of some of these books as learning aids?Ok, I admit perhaps it was a late night and frustration. :???: I could have been hallucinating when i was doing the typein. But I think not.. [url]…

    ... .

    Try this:
    [code]
    10 RANDOMIZE
    20 ... due to system messages
    [/code]

    If the flashing ... laid out in a non-linear way (as opposed to the ...
    Arjun Arjun August 2012 Sinclair Basic
  • WibbleBibble's Basic threadHi in an attempt to keep my questions from spamming the forum. I think its better to put them all in one place. Thanks everyone so far, I feel I am …

    ... before.

    [CODE]
    100 FOR T=9 ... 220 NEXT T
    [/CODE]added the left/right printing ... .

    [CODE]
    100 FOR T=9 ... colour array.

    [CODE]
    90 PAPER 0: BORDER ... because there turn based, linear, and rely on a ...
    WibbleBibble WibbleBibble September 2012 Sinclair Basic
  • ZX7: an "optimal" LZ77 packerAbout 20 years ago, I started a M.Sc. in Computing, planning to work on data compression. Although I quickly changed to another subject for a number …

    ... one is this:

    [CODE]
    #include
    int main ... .99, a SCR filter to linear xored output by Antonio Villena ...
    antoniovillena antoniovillena January 2013 Brand new software
  • RCS (Reverse Computer Screen)[B]RCS[/B] ("Reverse Computer Screen", or simply SCR written backwards) is a small utility I'm about to release, that reorders bytes from the ZX-Spec…

    ... as character blocks, rather than linear data in order to get ... compress square areas instead of linear sequences, that I commented [URL ... be simplified to this:
    [CODE]
    0: Empty cell. Encoded ... 16th of the TL quarter.[/CODE]

    Therefore an ...
    Einar Saukas Einar Saukas January 2013 Development
  • RCS (Reverse Computer Screen)[B]RCS[/B] ("Reverse Computer Screen", or simply SCR written backwards) is a small utility I'm about to release, that reorders bytes from the ZX-Spec…

    ... :
    1. From spectrum to linear buffer. (not RCS)
    2 ... you have the results
    [code]
    6.144 cobra-uncompressed ... .047 cobra-cjb2.djvu
    [/code]

    And here the ...
    antoniovillena antoniovillena February 2013 Development
  • RCS (Reverse Computer Screen)[B]RCS[/B] ("Reverse Computer Screen", or simply SCR written backwards) is a small utility I'm about to release, that reorders bytes from the ZX-Spec…

    ... :
    1. From spectrum to linear buffer. (not RCS)
    2 ... you have the results
    [code]
    6.144 cobra-uncompressed ... .047 cobra-cjb2.djvu
    [/code]

    And here the ...
    Einar Saukas Einar Saukas February 2013 Development
  • RCS (Reverse Computer Screen)[B]RCS[/B] ("Reverse Computer Screen", or simply SCR written backwards) is a small utility I'm about to release, that reorders bytes from the ZX-Spec…

    ... /> 1. From spectrum to linear buffer. (not RCS)
    ... the following table, the "linear buffer" transformation is identified as ... | 85.74%[/CODE]
    These results (using linear buffer and XOR ... is unfortunate, since encoding linear buffer is much easier than ...
    Einar Saukas Einar Saukas February 2013 Development
  • RCS (Reverse Computer Screen)[B]RCS[/B] ("Reverse Computer Screen", or simply SCR written backwards) is a small utility I'm about to release, that reorders bytes from the ZX-Spec…

    ... obtained the following results:
    [CODE]file | size |RLE0bit| LIN+ | RCS ... .60%| 60.58% | 59.70%[/CODE]
    According to these results ... provides better compression than LIN (linear buffer order), although the difference ...
    Einar Saukas Einar Saukas February 2013 Development
  • TimesplittersI can't find the "Please sign the Timesplitters petiton" thread I made some months back (bloody WOS search engine!), but re: that thread; "[COLOR="B…

    ... months back that the source code for Blood would be released ... claiming to possess the source code, meaning that a Windows build ... programmer not releasing the source code but instead him (or her ... , but it was much more linear than the PC version, and ...
    ewgf ewgf March 2013 Chit chat
  • pathfindingworking on pathfinding in the game. here is Russian description of Lee's algorithm: [url]http://algolist.manual.ru/games/wavealg.php[/url] "if-then"…

    ... of A* it can be linear.

    Also, I had ... /> Looking at my previous pseudo-code, the operations are very simple ...
    Patrik Rak Patrik Rak May 2013 Development
  • pathfindingworking on pathfinding in the game. here is Russian description of Lee's algorithm: [url]http://algolist.manual.ru/games/wavealg.php[/url] "if-then"…

    ... A* it can be linear.[/QUOTE]


    The pseudo-code change is trivial:
    < ... br /> [CODE]pathfind2(position SOURCE, position DESTINATION ... S NO PATH"
    }[/CODE]

    The ... extra Z80 assembly code required to manage whatever ...
    Einar Saukas Einar Saukas May 2013 Development
  • Siege RTS projectActually, it's but pre-prototyping: an upside-down tower-defense version of Sodov ([url]http://www.worldofspectrum.org/infoseekid.cgi?id=0004618[/url…

    ... Black Raven). The engine uses linear screen buffer (as Black Raven ... is used).
    With this code, you can use sprites of ... wide.
    With Black Raven code, you can use sprites of ...
    Alone Coder Alone Coder May 2013 New game ideas
  • Scrolling by 2 pixelsWhat is the fastest way of scrolling a Spectrum screen line by 2 pixels left or right? When thinking about it I've come to this simple solution: [C…

    ... I was making operations on linear screen buffer in memory. ...
    My current code is:

    [CODE]ScrollScreenBuffer
    DI
    EI
    RET[/CODE]

    A bit of ... unlooped code but I can spare this ...
    Ralf Ralf August 2013 Development
  • The Pros and Cons of "alternative" assembler syntaxContinuing from [URL]http://www.worldofspectrum.org/forums/showpost.php?p=720754&postcount=72[/URL] [QUOTE=u6c87;720754]But that wouldn't change if…

    ... code because they make use of abstractions such as block buffers, linear ... a layer of platform independent code that implements the idea of ... then leads to platform specific code that does things well for ... z80 target with only some code in the backend modified for ...
    Alcoholics Anonymous Alcoholics Anonymous September 2013 Development
  • Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…

    ... , and there is well documented code - so it looks like a ... video and audio, has a Linear Time Code form, for recording on ...
    GoingDigital GoingDigital September 2013 Development
  • The making of R-Type on the speccy book, free downloadBob Pape, the guy who wrote R-Type on the speccy has made his book, "IT'S BEHIND YOU: the making of a computer game", available for free download: [u…

    ... coarse hardware scroll and a linear bitmap mode (the first 40 ... still be freely used for code or data without issue though ...
    TMR TMR September 2013 Games
<1…10111213141516…34>

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