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<1…22232425262728…34>
  • UDG tricks?I always enjoyed using [URL="http://www.worldofspectrum.org/ZXBasicManual/zxmanchap14.html"]UDGs [/URL]for the 'sprites' in my games, when I coded th…

    ... any BASIC program. A system variable called RAMTOP controls how far ... to allow space for any variable data the program defines when ... can safely POKE the UDG address space.

    Just remember ... one byte below the first address you want to POKE.
    joefish joefish June 2014 Sinclair Basic
  • Dock's ZX Maze gameI'm hoping to finish a simple maze game in ZX Spectrum BASIC this week, as part of the Ludumdare Retro challenge. I used to dabble in speccy basic on…

    [QUOTE=Battle Bunny;774142]Here's some extracts from a program which I've been working on recently, which illustrate some methods to consider. An exhaustive commentary follows ...

    [code]
    35 LET j1= 0: LET j2=-1: LET s=1: RETURN
    ...
    davepierce07 davepierce07 June 2014 Sinclair Basic
  • Is there an emulator that.....?I tried firing up Alien8 yesterday but the wildly variable frame rate is just too much hassle these days. Does there exist an emulator that can adjus…

    ... Alien8 yesterday but the wildly variable frame rate is just too ... ....etc but it doesn't address the problem.[/QUOTE]

    btw, do you think the variable frame rate in Alien 8 ...
    Pegaz Pegaz June 2014 Games
  • Differences between 128k+ and +3 RGB video circuitsHello, Have a bit of a dilema with some strange video results on my +3. Here's my setup: I have a RGB Scart to Component converter that is hooked up…

    ... any activity on the memory address/keyboard X lines. Or a ... on IC 1(40077 gate array) (R1, G1, B1) before getting ... .
    IC 1 (40077 gate array) may be shot? :/

    thomas3120 thomas3120 July 2014 Hardware
  • analysing program variable usageIf I wanted to count the number of times each variable is referenced while a program is running (not the number of times each variable is referenced …

    ... /> If you know the address of your variable in (VARS) you could ... how many times that memory address was accessed at runtime.
    dbolli dbolli July 2014 Sinclair Basic
  • Why no PLOT, etc. on bottom two lines?I was pondering if there was any way to get PLOT, etc. to address the full screen from BASIC without having to write a few lines of assembler to bypa…

    ... $()' is a 256*8 byte array of BIN strings from "00000000 ... coordinates into a display file address, and the remainder set the ...
    Battle Bunny Battle Bunny August 2014 Sinclair Basic
  • automatic relocating of non-relocatable codeI was pondering upon the problem of changing absolute addresses used by CALL, JP, etc. when code is moved, without reassembling at the new location; …

    ... of holding an address & value for each variable location it just ... holds the address, calculates (once ... the assembled value at the address, so the adjustments table is ...
    Battle Bunny Battle Bunny August 2014 Development
  • Game of Life.Last year (I think) or maybe the year before, I entered a Game of Life simulator into the CSS CGC compo but for the Sinclair ZX81. I decided to port…

    ...
    ld de,Gdollar ;DE=address of variable name
    ld (23645 ...
    jp c,$0670 ;"2 - Variable not found"
    ld bc ...
    Battle Bunny Battle Bunny September 2014 Sinclair Basic
  • Creating a linked list in Z80[FONT=Calibri][SIZE=3]I am using a circular buffer to store tiles to be displayed on the screen. Tiles only appear for a set period of time, so when …

    ... stack but cannot grow past array size
    ba_priority_queue: ... priority_queue but cannot grow past array
    wa_priority_queue: like ... priority_queue but cannot grow past array

    Items ... any 2-byte quantity (int, address, etc).

    ...
    Alcoholics Anonymous Alcoholics Anonymous October 2014 Development
  • Creating a linked list in Z80[FONT=Calibri][SIZE=3]I am using a circular buffer to store tiles to be displayed on the screen. Tiles only appear for a set period of time, so when …

    ... your buffer's start address) and the address of the last tile ... ] store the address of the last tile in a variable elsewhere (but ... last dead tile in a variable. When deleting a run of ... the "previous pointer" to the address stored in "last_dead_tile_var"
    If ...
    Dunny Dunny October 2014 Development
  • Help needed with a bit of code...My minds gone blank again I'm afraid, I'm having trouble with this routine that loads variables into memory then calls the corresponding routine. Th…

    ... better than poking the call address. That is, calling ... to redirect to the required address.

    There ... Store each sub-routine address followed by its three variables ... : address, byte, byte, byte. ... pointing to its first variable.
    Battle Bunny Battle Bunny October 2014 Development
  • LOAD "" CODE in machine code/store 128 bank dataHow do you LOAD "" CODE from machine code? I have written the following MC routine that fits into a REM statement in a basic program. I want to cal…

    ... 7)
    adress 23388 = BANK_M variable. used like poke 23388, 16 ... that some bytes near that address may be used as a ...
    Zup Zup October 2014 Development
  • Alkatraz Protection System - "How to" and compo?I'm thinking about writing a "how to" regarding the [URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0020807"]Alkatraz Protection System[/URL].…

    ... address 32000 and that now needs to be entered as a variable ... was compiled to run from address 60000.
    Our parameters will ...
    jp jp November 2014 Announcements
  • Please explain Spectrum FPGA-clones to meI've been using the great ZXDS-emulator on the DS XL so far, which is great. But I kinda missed toying around with hardware. I've tried bidding on a …

    [QUOTE=joefish;799852]It's programmable and you program it with a program. It's no less a program than holes on a punched card or spurs on a cam. It's not magic![/QUOTE]
    No, it's not. It's configurable, not programable. What you store into it is not ...
    mcleod_ideafix mcleod_ideafix November 2014 Hardware
  • 64x48 monochrome big pixels display ideaHi. I was playing with this idea of having a simple 64x48 bytes buffer, 1 byte per pixel, then a renderer which would take that buffer and render it…

    ... 'spdat' entry, storing the variable data.
    [/list]
    address
    defb 0,4 ; ... defw 0000 ; display file address
    defb 0,4 ; ...
    Battle Bunny Battle Bunny December 2014 Development
  • assembler for PcHi guys, I'm in the process of teaching myself machine code, and wondered if there is a good pc program for writing code. Or is the best thing to use…

    ... directory to the PATH system variable.

    * This step isn ... to the end of the "Variable Value", it should be seperated ... file, the label determines the address the routine will be run ... the machine code from the address you specified in the END ...
    GReW GReW December 2014 Development
  • Double keystrokes on zx spectrumHappy New Year everyone. I have this spectrum 48k issue 3b I?ve been working on now and then. I have replaced upper rams, installed a lower ram repla…

    ... 's affecting the REPDEL system variable at address 23561... entering POKE 23561 ...
    gasman gasman January 2015 Hardware
  • Return to basic from sna created by Z80 compilerHow can I go back to basic when running sna created using Z80 Assembler ([url] http://www.worldofspectrum.org/utilities.html#crossass [/url])? For e…

    ... ):
    [list]
    [*]The return address on the stack must be ... return to $3365:RE_ENTRY. The address $2758 is normally used.
    [*]The system variable (CH_ADD) must point to the ...
    Battle Bunny Battle Bunny January 2015 Development
  • Testers for new z88dk clibA long (long, long, long) time ago a few people offered to help test the new clib in z88dk. Much time has passed since then and I won't hold people,…

    ... ,0xaa };

    // Attach C Variable to Sprite Graphics Declared in ... gr_window[]; // gr_window will hold the address of the asm label _gr_window ...
    Alcoholics Anonymous Alcoholics Anonymous February 2015 Development
  • Testers for new z88dk clibA long (long, long, long) time ago a few people offered to help test the new clib in z88dk. Much time has passed since then and I won't hold people,…

    ... the graphics are in an array but when I try to ... access the array from asm, i get ... 2 bytes before the array.

    I try ... put the pointer to the array into de but it ... hl,sp ; skip over return address on stack
    ld e ...
    slenkar slenkar February 2015 Development
  • Testers for new z88dk clibA long (long, long, long) time ago a few people offered to help test the new clib in z88dk. Much time has passed since then and I won't hold people,…

    ... the graphics are in an array but when I try to ... access the array from asm, i get ... 2 bytes before the array.

    I try ... put the pointer to the array into de but it ... (2 bytes)
    return address

    low address
    [/code]
    Alcoholics Anonymous Alcoholics Anonymous February 2015 Development
  • Sorting variablesHi there. I'm trying to make a greyhound betting game. I'm ok on the straight win part but need some help with the other bets and sorting dogs(1st,2n…

    ... array for information about the dogs, instead of having a seperate variable ... [B]also be a variable.[/B] For example if ... ways to sort an array, but one of the ... you work through the array and check if every ... go through the entire array, without having to swap ...
    GReW GReW March 2015 Sinclair Basic
  • Sorting variablesHi there. I'm trying to make a greyhound betting game. I'm ok on the straight win part but need some help with the other bets and sorting dogs(1st,2n…

    ... array for information about the dogs, instead of having a seperate variable ... [B]also be a variable.[/B] For example if ... you work through the array and check if every ... go through the entire array, without having to ... but doesn't work. variable not found at line ...
    davepierce07 davepierce07 March 2015 Sinclair Basic
  • Sorting variablesHi there. I'm trying to make a greyhound betting game. I'm ok on the straight win part but need some help with the other bets and sorting dogs(1st,2n…

    ... in but doesn't work. variable not found at line 120 ... that you've dimensioned an array d() of size arraysize.
    If you still get the variable not found error, look at ... 're having trouble, type each variable in direct mode and see ...
    GReW GReW March 2015 Sinclair Basic
  • More SpecBAS funHere's a neat little effect I lifted from a thread about displaylists and stuff from an Amiga forum - although SpecBAS has no hardware to assist, it …

    ... identified by the "circles" variable so that all graphic/text ... graphic's pixels into an array. The array is "pic$" and ... 256 pixels tall, the array is sized to match. ... of it in the pic$ array!

    Then ... of pixels from the pic$ array - a being the y ...
    Dunny Dunny March 2015 Sinclair Basic
  • SPIN AssemberHi, I'm in the early stages of learning assembler, and am now looking at some tutorials from Toni Baker in ZX Computing: [url]http://wos.meulie.net…

    You need to specify the address TVFLAG e.g.

    [ ... a full set of System Variable and ROM routine equates
    dbolli dbolli March 2015 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…

    ...         ;; is the target address to be put into IX ... address into HL, length into DE
            ;; DEFADD is the system variable ... containing the address
            ;; of the ... we need to set the address
            ;; to ...
    stephenw32768 stephenw32768 May 2015 Development
  • Double height text...<p>Is here any good routines for printing a font double height?</p><p>I've concocted this ridiculous routine but I'm sure it can be done much better.…

    ... and just swaps the font address sysvar back and forth. It ... printed by setting the font variable to point at the sprite ...
    guesser guesser June 2015 Development
<1…22232425262728…34>

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