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  • packers / crunchers and general compressionI'm just curious where I would find such things, coming from a c64 background also , there is shedloads. I mean the obvious things like crunchers fo…

    I used to use the [url=http://www.worldofspectrum. ... matt/speccy/chrust/]chrust[/url]). The Mikropol one is quite nice ... solution, because it includes the depacker routine in the output.

    the routine did weird things with the stack, but that ...
    gasman gasman November 2009 Development
  • Txt speakz.I will admit im not the best when it comes to text speak but mostly i use common sense and its usualy quite easy to work out, but for some reason tod…

    ... head back home and hit the stack of hay.
    ZnorXman ZnorXman November 2009 Chit chat
  • SP and IM2 woesI have a function that writes the backbuffer to the screen using the method by which SP is stored, I "POP" a load of registers and then chnge SP to t…

    Yup, no way around that unfortunately - although it is a right royal pain in the butt!

    You either have to disable interrupts, or time things very carefully, if you're using the stack that way.
    bobs bobs November 2009 Development
  • The ZX App StoreI was watching one of those iphone adverts and got to thinking Hmmmmm what if you could do something like that for the speccy. Ok heres the idea, if…

    ... /> When I finally get the specs for the Harlequin (v2) finalised and ... channel.... Perhaps even over wifi... The stack is going to be 'ard ...
    csmith csmith November 2009 New game ideas
  • Z80 'EXX' ConfusionI was working on a little Z80 routine last evening, and, having run out of registers, resorted to sticking one of the values into a memory location a…

    Thanks for the further (and finer) details!< ... registers I use on the stack at the beginning, and retrieve ... them just before the last RET... Until such ... no last RET, and the only way out will ... be the pulling of the proverbial plug!
    ...
    RoseCotton RoseCotton November 2009 Development
  • More colours II (Was: Most popular new features?)The suggested 4xCLUT multi-colour solution never took off.

    ... 256 colour HAM pictures on the Speccy. The thing is, even in ... 8x1 across about half the width of the screen anyway.
    < ... br /> [QUOTE=Black_Cat;403993]For the existing management system is not ... scanlines while POPing data off the stack or not, but if it ...
    chev chev December 2009 Emulators
  • More colours II (Was: Most popular new features?)The suggested 4xCLUT multi-colour solution never took off.

    ... scanlines while POPing data off the stack or not, but if ... is no doubt that the existing software can not ... used in conjunction with the video mode that I ... propose. Is the existing already in the ULA+ video mode ... to be implemented in the ZX Spectrum? Or is ...
    Black_Cat Black_Cat December 2009 Emulators
  • Z80 'EXX' ConfusionI was working on a little Z80 routine last evening, and, having run out of registers, resorted to sticking one of the values into a memory location a…

    ... also never really saw what the point of EX (SP),HL ... you're passing parameters on the stack, it means that you can ... POP HL to pick the return address off, then POP ... (SP),HL to pick up the last one and push back ...
    gasman gasman December 2009 Development
  • Z80 'EXX' ConfusionI was working on a little Z80 routine last evening, and, having run out of registers, resorted to sticking one of the values into a memory location a…

    ... but unpage as well (via the unpage address), I need ... be able to insert the unpage address on the stack and leave with ... no registers disturbed. I can use the last stack ... entry to temporarily store HL while setting the ...
    Winston Winston December 2009 Development
  • Z80 'EXX' ConfusionI was working on a little Z80 routine last evening, and, having run out of registers, resorted to sticking one of the values into a memory location a…

    ... also never really saw what the point of EX (SP), ... you're passing parameters on the stack, it means that you can ... POP HL to pick the return address off, then ... SP),HL to pick up the last one and push back ... that's still present on the ARM? Still not sure what ...
    joefish joefish December 2009 Development
  • To bobs, andrew rollings, psj etchi folks, yes I'm a bit hyper today, don't know why. I apologise to you bobs for getting your thread closed, I'll try not to do that again. :-o sor…

    ... :

    1) The "light the blue touch-paper and retire ... as well say the Flying Spaghetti Monster created the universe, and ... Anyone read Joseph Campbell's The Hero with a Thousand Faces ... reading... (just to continue poking the hornets nest, but with a ...
    Danforth Danforth December 2009 Chit chat
  • To bobs, andrew rollings, psj etchi folks, yes I'm a bit hyper today, don't know why. I apologise to you bobs for getting your thread closed, I'll try not to do that again. :-o sor…

    ... br />
    1) The "light the blue touch-paper and retire ... does not necessarily equal the evidence of the lack of something. ... mutations resulting in the survival of the animals most fitted ... reading... (just to continue poking the hornets nest, but with a ...
    ewgf ewgf December 2009 Chit chat
  • Memory concerns with z88dkI've retaken my old spectrum project and sadly I've reached a dead end very fast. I'll try to explain my worst problem in a few lines. I'm not a vet…

    ... use, something messes with the stack or the stack messes with something else.[/quote ...
    Philip Kendall Philip Kendall December 2009 Development
  • Memory concerns with z88dkI've retaken my old spectrum project and sadly I've reached a dead end very fast. I'll try to explain my worst problem in a few lines. I'm not a vet…

    ... to external code using the usual rules. The usual rules are: ... and output the result after applying the c preprocessor. The most useful ... suspect maybe you've placed the stack on top of your program ... sp1 and you cannot place the stack in the same place! I,ll ...
    Alcoholics Anonymous Alcoholics Anonymous December 2009 Development
  • Memory concerns with z88dkI've retaken my old spectrum project and sadly I've reached a dead end very fast. I'll try to explain my worst problem in a few lines. I'm not a vet…

    ... , something messes with the stack or the stack messes with something else ... functions are allocated on the stack as needed. When functions ... are destroyed by moving the stack pointer upward in memory ... suggestions reserves 512 bytes for the stack.

    3 ...
    Alcoholics Anonymous Alcoholics Anonymous December 2009 Development
  • Memory concerns with z88dkI've retaken my old spectrum project and sadly I've reached a dead end very fast. I'll try to explain my worst problem in a few lines. I'm not a vet…

    ... pushes and pops. After the music code returns the stack (value in SP ... ) will point at the same place ... the same area in the music bank for the stack.

    The XREF in the ...
    Alcoholics Anonymous Alcoholics Anonymous December 2009 Development
  • What Z80 development tools do you use? What books?Hi. I've been meaning to do it for over 25 years, but.. better late than never :) I'm starting to learn machine code and am trying to get a developme…

    [QUOTE=Arjun;410981]....The problem I think is that ... programming on paper and then poking the numbers by hand. Bitwise notations ...
    roko roko December 2009 Development
  • What Z80 development tools do you use? What books?Hi. I've been meaning to do it for over 25 years, but.. better late than never :) I'm starting to learn machine code and am trying to get a developme…

    ... 6683 outputs 668365526

    The first 6683 is printed in ... /> The WriteMsg in the second routine is lovely using the stack to find the data ... following the CALL. Most of ...
    Geoff Geoff January 2010 Development
  • What Z80 development tools do you use? What books?Hi. I've been meaning to do it for over 25 years, but.. better late than never :) I'm starting to learn machine code and am trying to get a developme…

    ... ]It was the Noughties, now it's the Oonies.[/quote ... like some California offshoot of the Moonies to me... Welcome ... The WriteMsg in the second routine is lovely using the stack to find the ... data following the CALL....[/quote]< ...
    xyzzy xyzzy January 2010 Development
  • Fastest fill m.c. routine ever?What is the fastest fill routine you've ever seen? Is there a listing somewhere? Most games and adventures that use fill routines were considered slo…

    ... is allocated on the stack. The subroutine allows the caller to determine ... how much space is available on the stack ... and if the filler ruins out ... polygons. Knowing the boundaries of the sjape being filled ...
    Alcoholics Anonymous Alcoholics Anonymous February 2010 Sinclair Miscellaneous
  • Fastest fill m.c. routine ever?What is the fastest fill routine you've ever seen? Is there a listing somewhere? Most games and adventures that use fill routines were considered slo…

    ... can see the evolution of the filler programs. The first one ... . The other problem is the stack space usage. 300+ bytes on the stack is ... reserved that much space for the stack. An exception would probably ... can require a lot of stack space. Because a true ...
    Alcoholics Anonymous Alcoholics Anonymous February 2010 Sinclair Miscellaneous
  • OR in a IFHi guys, I have a string that is defined by the user. I want to have an IF that does something like IF string<> a OR b OR c THEN goto 10 Hope that m…

    ... /> PEEK 32768

    remember the value.

    Now POKE ... that with address 65535 though, the stack is there I think.)
    Paradigm Shifter Paradigm Shifter February 2010 Sinclair Basic
  • Please test my Manic Miner remake!Thanks to everyone who downloaded my sneak preview of Manic Miner Turbo. Thanks especially to na_th_an who is the only person so far to give feedback…

    ... you can optimise the inner loop to remove the push / pop of ... which is ideal for using the stack pointer. Second attempt:

    the loop for the cost of setting up ...
    The President The President February 2010 Games
  • OptimisationI've participated in several thread hijacks about this, so perhaps I should open a new thread. Et VIOLA! Here it is! Knuth, who was earlier reporte…

    ... contiguous again).

    The copy and compact is fairly ... slow. The garbage collector runs in the background and when ... you can allocate data on the stack (all Java class data ... pointers differently [they are like the "restricted" pointers in C99, ...
    Paradigm Shifter Paradigm Shifter February 2010 Development
  • shifting spriteshi. have anyone experience with shifting sprites by table ? some neat tricks ? i don't want to see complete code (really don't want, it trashes thr…

    ... wrote), no need to or the data together, but that was ... at once" trick with modifying the stack pointer, so that was probably ...
    Paradigm Shifter Paradigm Shifter February 2010 Development
  • OptimisationI've participated in several thread hijacks about this, so perhaps I should open a new thread. Et VIOLA! Here it is! Knuth, who was earlier reporte…

    ... that one lang is stack based, the other heap. I ... and see that C# uses the stack. Thought so.

    the bytecode underneath) would have performed ... of work on the GC in the dotGNU runtime engine, ... that cut out the parts for the VW Passat. Got ...
    csmith csmith February 2010 Development
  • OptimisationI've participated in several thread hijacks about this, so perhaps I should open a new thread. Et VIOLA! Here it is! Knuth, who was earlier reporte…

    ... pretty hard to beat the compiler's optimiser these ... lives in the office, locked away from the other coders ... feature that you know the optimiser/compiler does not ... needed to use to avoid the stack, etc. You can't ...
    But this is the WOS and we are supposed ...
    csmith csmith February 2010 Development
  • OptimisationI've participated in several thread hijacks about this, so perhaps I should open a new thread. Et VIOLA! Here it is! Knuth, who was earlier reporte…

    [QUOTE=csmith;426418]Edit: Read your post again, and see that C# uses the stack. Thought so.[/QUOTE]

    It uses the stack for value objects primarily. User objects and reference types usually reside on the heap.
    Arjun Arjun February 2010 Development
  • Z80 compressorIs there one available? Is it any good? Peeps have been suggesting we should look into this, so here's a new thread! I'd do the compressor on the …

    ... /MegaLZ/]New MegaLZ[/url] is the next best at packing overall ... . It doesn't mess with the stack either.

    Full c ... source code is available in the development package at MegaLZ site ... .
    And all the packers mentioned are included in ...
    FrankT FrankT February 2010 Development
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Latest Posts

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