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<1…16171819202122…34>
  • 40 Column Printing RoutineI've written a 40 column printing routine, which I'd like to share... It's my first piece of 'public' code so go easy on me! I don't think it is a…

    ... registers, call the
    push bc ; printing routine, put ... a ; definition is stored in memory.
    add hl, hl ;< ... ;

    colad:
    push hl ; And another useful routine ... - it
    push af ; calculates the relevant ...
    chev chev August 2012 Development
  • 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…

    ... bytes are now at memory address 33000 by clicking ... at GAMEOVER insert line21, 'push bc; save score'. ...
    newroadposn
    push hl ;save road posn
    push hl ;save road posn< ...
    newroadposn
    push hl ;save road posn
    buzzy buzzy September 2012 Development
  • What Spectrum projects (Software/Games/Utility)(Hardware)(Others) are you working on?So, basically that :) You dont have to give names or more clues if you dont want to ;) Also, if you are working on more than one, you can tell all of…

    ... [/B] having a go at PUSH scrolling. Don't forget that ... , not vertical. This will waste memory on routines and graphics to ... compression to preserve as much memory as possible for level data ...
    joefish joefish October 2012 Development
  • UDG in AssemblyHello there my fellow WoS'ers I am currently having a play with z88dk and PASMO and would like to have some fun with some UDG's so is there a tutor…

    ... and writes them to screen memory. It's a bit impractical ... function
    push af
    push bc
    push de
    push hl ;store ... = address of character graphic
    push hl ;store for later
    joefish joefish October 2012 Development
  • my tiny intros[IMG]http://pouet.net/screenshots/60493.png[/IMG] [url]http://pouet.net/prod.php?which=60493[/url] the following work will appear behind Demosplash…

    ... 16
    L9DD3:
    PUSH BC
    LD B, $ 1F ... 5800, d, 0
    push hl; stored on the stack ... (hl); color left
    push de; store value
    ... the result in the attribute memory area
    ld ... 2byte/3 byte
    push hl
    ld e ...
    g0blinish g0blinish October 2012 Development
  • calculator and sinusok, look at the Sysel's routine: [PHP]3 5b00 *s 4 5b00 tabsin = #7000 03 mksin 19.11.1995 Busy soft …

    ... /> I'm using the 0x34 (push constant) code, which saves having ... RANDOMIZE '
    * in the FUSE memory browser, flip to 0x5d00ish, find ...
    gasman gasman October 2012 Development
  • Boriels ZX CompilerI'm trying to compile a very simple program and I keep getting the error: unexpected end of file. Here's my code: [CODE]10 cls 20: let n=0 22 do 2…

    ... cut down libraries due to memory and cpu constraints.

    push Python as the new language ...
    RobeeeJay RobeeeJay October 2012 Development
  • Boriels ZX CompilerI'm trying to compile a very simple program and I keep getting the error: unexpected end of file. Here's my code: [CODE]10 cls 20: let n=0 22 do 2…

    ... don't need to push the speed nor memory efficiency to the ...
    Patrik Rak Patrik Rak November 2012 Development
  • Fantasy Z80 instructions?This follows on from something catmeows said in another thread, and that I've been meaning to ask for a while. This may sound daft to people with mo…

    ... ]
    DEFINE MIRROR_A
    push bc
    push af
    ld c ... />
    IMHO ULA ( and terrible memory paging) is real show stopper ...
    catmeows catmeows November 2012 Development
  • Machine code RST10 problemHello! After 27 years of playing with Spectrums I'm starting to look into doing assembly language properly. All went swimmingly well until I wrote …

    ... /> .msgprt ld de,$5068 ; screen memory where messages will appear
    push hl ; store our string address ... the correct row in screen memory
    inc e ; point ... to next character in screen memory
    pop hl ; retrieve ...
    snigfarp snigfarp November 2012 Development
  • Machine code RST10 problemHello! After 27 years of playing with Spectrums I'm starting to look into doing assembly language properly. All went swimmingly well until I wrote …

    ... both index registers I DI, PUSH IY, do the job, then ... for another 10 bytes of memory, as my newer direct screen ... memory write routine is faster. But ...
    snigfarp snigfarp November 2012 Development
  • RAM used / corrupted by +3DOSAs I said previously, [url=http://www.worldofspectrum.org/forums/showthread.php?t=41775]I'm trying to put some games in hard disk[/url] so they can b…

    ... , I don't understand how memory is paged. Page 7 and ... /> ld bc,$7ffd
    push af
    push bc
    res 4 ...
    Zup Zup December 2012 Games
  • 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 …

    ... the file at a given memory location - the same way ... extract the screen without corrupting memory elsewhere.

    The code ... ; store source, restore destination
    push hl ; store destination
    sbc ...
    FrankT FrankT 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…

    ... data block into a temporary memory area, then run a small ... method requires a large temporary memory area, thus an even better ...
    Einar Saukas Einar Saukas January 2013 Development
  • RAM used / corrupted by +3DOSAs I said previously, [url=http://www.worldofspectrum.org/forums/showthread.php?t=41775]I'm trying to put some games in hard disk[/url] so they can b…

    ...
    ld e,l
    push de
    call $1820 ; initialise ... of which resides in high memory. I just put my routine ...
    Battle Bunny Battle Bunny January 2013 Games
  • 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 …

    ... store source, restore destination
    push hl ; store destination
    ... = destination
    copy_bytes:
    push hl
    ex de, hl ... data to any other memory area, it will assume ...
    Einar Saukas Einar Saukas January 2013 Brand new software
  • Getting Unit CHS detail in +3e BASICHello there my fellow WoS'ers I would like to know if there are system VARS or PEEK's that I could use to get the CHS info within BASIC at the mome…

    ... from each partition into the memory for later processing. It will ... a,0 ;IDE device
    push hl ;save hl
    call ... /> ; end

    fine
    push bc
    ld bc,pagport ...
    BCH BCH January 2013 Sinclair Basic
  • Compiling Lisp to Z80.I am doing some thought experiments on this. Here is an example of a Lisp program. It adds two numbers together. [code] (define (add x y) (if (= …

    ... went and looked up the push and pop instructions. It turns ... its results in some dedicated memory locations. Be creative. :)

    Timmy Timmy January 2013 Chit chat
  • Compiling Lisp to Z80.I am doing some thought experiments on this. Here is an example of a Lisp program. It adds two numbers together. [code] (define (add x y) (if (= …

    ... values in a register or memory location would cause problems if ... values in a register or memory location, you should never have ... after popping the parameters, I push the return address again. At ...
    Timmy Timmy January 2013 Chit chat
  • Memory diagnostic toolIs there any sort of memory diagnostic tool for examining .Z80 files so I can easily identify large areas of blank memory? Scrolling through ZX Spin…

    ... to the debugger's Memory tab and drag down ... nz,NOTVAL

    push hl ;found a (VALUE)
    push hl
    call CHECK
    push hl
    push bc
    call ...
    Battle Bunny Battle Bunny February 2013 Development
  • Getting PC into HLHello, here's a conundrum for you... Is there a way to obtain the value of the PC register (say into HL) without using absolute addressing such as C…

    ... ? Even if you're allocating memory on the fly somehow, you ... could simply execute POP HL/PUSH HL at the beginning of ...
    Einar Saukas Einar Saukas February 2013 Sinclair Miscellaneous
  • The Disciple clone... doable?Hi. As a spectrum user in the 80's this was the dream interface all-in-one for me. I have a 48k+ and planning on get a 128K toast-rack later. Anyway…

    ... br />
    [CODE]
    SRC — memory source:
    0 for the ... 032C HALT
    0 0038 PUSH HL
    0 0039 LD ... HL,#0048
    0 003C PUSH HL
    0 003D ... HL,#5B00
    0 0040 PUSH HL
    0 0041 ... HL,#0038
    0 0044 PUSH HL
    0 0045 ...
    zub zub February 2013 Hardware
  • What do you think Amiga's chances are?Would you abandon Windows for Workbench? At least for your own enjoyment when you don't have to use Windows? [url]http://www.a-eon.com/[/url] [url]…

    ... of really useful things like memory protection and decent network support ... shame Commodore didn't really push the machine into business markets ...
    AndyC AndyC March 2013 Chit chat
  • Circumspect - A Spectrum Emulator for learningThis is a project that I have been playing around with for a while. It must be said, I tend to have problems getting things finished where hobbies a…

    ... improvement.

    Having filled memory with random garbage, I was ... extracted a loading image into memory:

    [IMG]http://i590 ... that I have forgotten to push the return address to the ...
    ramsrc ramsrc April 2013 Emulators
  • Keyboard Membrane Speccy +Grrrr! I'm having real problems getting the keyboard on my resurrected Spectrum+ to work reliably. I changed the keyboard membrane, and all seems to…

    ... molex connectors (into which you push the keyboard membrane tails)
    memory - it worked fine for about ...
    rwap rwap April 2013 Hardware
  • 16k programmingHi all, If I want to code something for a 16k (or any spectrum) my understanding was that if I CLEAR below 24064 and put all the code above it up to…

    With no BASIC in memory and no extra hardware attached, ... with the BASIC loader in memory.

    So I would ... any peripherals attached which might push up PROG, etc.

    Battle Bunny Battle Bunny April 2013 Development
  • Relocation with SDCCI desperately need auto- relocation with SDCC. Something that will compile all of my code using start address 0 and generate relocation table so that…

    ... is then done with push/pop pairs. A variable ... /written with a single push/pop pair that consumes ... the stack, the more push/pops have to be ... multiple heaps (for different memory banks or for the ... its balloc library (block memory allocator) but it operates ...
    Alcoholics Anonymous Alcoholics Anonymous June 2013 Development
  • Relocation with SDCCI desperately need auto- relocation with SDCC. Something that will compile all of my code using start address 0 and generate relocation table so that…

    ... br /> 000F C5 70 push bc
    71 ; ...
    001D E5 80 push hl
    81 ; ... hitters - mainly proc and memory management.

    ...
    u6c87 u6c87 June 2013 Development
  • Relocation with SDCCI desperately need auto- relocation with SDCC. Something that will compile all of my code using start address 0 and generate relocation table so that…

    ... can do non-aligned memory access, this could just ... br /> 000F C5 70 push bc
    71 ; ...
    001D E5 80 push hl
    81 ; ...
    Alcoholics Anonymous Alcoholics Anonymous June 2013 Development
<1…16171819202122…34>

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