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<1…78910111213…34>
  • Setting breakpoints in source code to make debugging easierAfter two years I've resumed my Speccy coding project. I'm porting a yet "unported" game from C64/Atari to 48k Spectrum using Z80 assembler. At the m…

    ... Speccy" emulator for running my code. Occasionally I also use Fuse ... instruction or macro in the code, which when encountered, would ... long delay loop in the code in the "interesting place", ... and memory, continuing the code execution is not possible as ...
    arttu arttu August 2019 Development
  • zx81 loading and saving codei cant get registered with the zx81 forum, so i thought id try here. how is this done? ive tried loading and saving using code xxxxx,xxxx but nothing…

    i cant get registered with the zx81 forum, so i thought id try here. how is this done? ive tried loading and saving using code xxxxx,xxxx but nothing seems to work.
    digital digital October 2019 Chit chat
  • How do emulators make code appears as running at 3.5Mhz?Decent Z80 emulators on github return t-states after executing an instruction, giving you the ability to emulate Speccy relatively well. But there ar…

    ... ) If I were to write code to emulate screen I would ...
    tstih tstih October 2019 Development
  • 2xBooks: Assembly Language For Arcade Games & Machine Code Sprites And GraphicsI'm looking for the following two books to help my machine code game programming: 1) Assembly Language For Arcade Games and Other Fast Spectrum Prog…

    ... books to help my machine code game programming:
    1) Assembly ... Stuart Nicholls
    2) Machine Code Sprites And Graphics For The ...
    LevelUp LevelUp November 2019 Wanted
  • im having problems stripping the database out of this code for quill adventure writerim trying to get the database out of rouge midget. ive managed to do this with another game written using quill but this one is too big. theres no…

    ... to remove some of the code in the last game to ... trying to load the "rmidget" code file.
    digital digital April 2020 Assembler
  • how do i set this code up, so i can print more than one line of text?well i got it working but how do i set this code up, so i can print more than one line of text? with a loop or something? not sure where to start on …

    ... how do i set this code up, so i can print ... , or using completely different code

    [code]org 40000
    ld ... 21, 0, 20, 0
    [/code]
    digital digital June 2020 Assembler
  • why am i getting b integer out of range in this code?ive tried running this in spin but thats what i get [code]main org 40000; ; We want a black screen. ld a,71 ; white ink (7) on black paper (0…

    ... i get

    [code]main
    org 40000;
    mushlp ld a,22 ; control code for AT character.
    rst ... basexy ld a,22 ; AT code.
    rst 16
    ld ... /> ld a,144 ; ASCII code for User Defined Graphic 'A ... ,60,60,60 ; mushroom.[/code]
    digital digital June 2020 Assembler
  • this code wont give me a random starfieldim using a peice of code that ive copied from a book, ignore most of it as it is redundant. for some reason i get a strange random starfield instead …

    ... one.

    [code]main
    org 40000;
    code.
    rst 16
    ... ld a,144 ; ASCII code for User Defined Graphic 'A ... 60,60,60 ; mushroom.
    [/code]


    ... look at the peice of code ''this is the bit ...
    digital digital July 2020 Assembler
  • CODE instruction in array$ PRINTSo I'm still plugging away at BASIC and have found a line of code (another!) that's really puzzling me. The line is as follows: PRINT A$(P+Q TO P…

    ... have found a line of code (another!) that's really ... $(P+Q TO P+R+CODE A$(P+T)),
    ... /> So as I understand the code line, it reads:
    ... br /> However, there's a CODE instruction in there and I ... I am misundertanding how the CODE instruction works or I' ...
    LevelUp LevelUp October 2020 BASIC
  • Prefered Tools for Developing Maching Code in 2021I am considering this year to fulfill my goal of actually writing machine code programs for the ZX Spectrum. I am an accomplished object oriented cod…

    ... goal of actually writing machine code programs for the ZX Spectrum ...
    Scottie_uk Scottie_uk January 2021 Assembler
  • Last Problem in Chapter 3 of Toni Baker's Mastering Machine Code on your ZX Spectrum.Chapter 3 of this great book is all about how to use the registers and covers the operations LD, ADD, ADC, SUB, SBC, INC, DEC, SCF and CCF. The la…

    ... would be appeciated.

    [code]Op Hex Notes
    LD ... C9 Return to basic
    [/code]
    Scottie_uk Scottie_uk February 2021 Assembler
  • Did you know that OBD II Code Readers can be bought new very cheaply?I got mine before Covid struck and the cheapest one was about £10 .Most cars built after about 1997 have an OBD II port hidden away usually under th…

    ... up your car and the code tells where the fault is ... mostly from China) . The cheaper Code Readers are very basic and ...
    harriusherbartio harriusherbartio August 2021 Chit chat
  • How do you publish your Z80 code online?I'm starting a blog about my pet project. One of the requirements is to publish explanatory Z80 code. What tools do you use for syntax highlighting? …

    ... is to publish explanatory Z80 code. What tools do you use ... I can feed raw Z80 code with and it does formatting ... 'm not afraid to write code for that). Perhaps even a ... that require me to feed code into editor and convert it ...
    tstih tstih December 2021 Development
  • Question about CP Z80 instructionSorry if this is the wrong folder, but it seems the most appropriate. When performing a CP instruction, is the P flag set when the compared values …

    Nice bit of code BB, did the missus help you with that?!!!!
    rich_chandler rich_chandler March 2003 Emulators
  • Question about CP Z80 instructionSorry if this is the wrong folder, but it seems the most appropriate. When performing a CP instruction, is the P flag set when the compared values …

    ... wrote:
    Nice bit of code BB, did the missus help you ... />
    (* /me quickly hides 'Machine Code for Infants' back in son ...
    BadBeard BadBeard March 2003 Emulators
  • Speccy machine code info where is it?Recently I've been trying to learn Z80 and I've managed to make limited progress (some of my routines even compile now!) but I seem to be having trou…

    I agree with BB about 'Machine Code for the Absolute Beginner'. I ...
    Malc74 Malc74 June 2003 Sinclair Miscellaneous
  • Speccy machine code info where is it?Recently I've been trying to learn Z80 and I've managed to make limited progress (some of my routines even compile now!) but I seem to be having trou…

    ... br />
    where
    BB = screen block (0,1,2 ... at (10,12):
    BB = 01 (row 10 is ... CCCCC=10001, TTT=000, BB=00, LLL=101, SSS= ... there's a borrow, BB must decrease by 1.
    code for scanning the keyboard, reading ...
    Alcoholics Anonymous Alcoholics Anonymous June 2003 Sinclair Miscellaneous
  • Anyone for a hacking challenge ?I have to get the DSK version of Tomahawk to work. It uses the well-known Digital Integration "SECURITY CODE" lock just like in Bobsled, ATF, etc. Th…

    ... leave it all to you BB :p

    ... 's the 'security code' generation code that GOC would have ... RET
    ----------------------
    end of code generation
    ----------------------

    code (ie. the code we see on ...
    BadBeard BadBeard August 2003 Sinclair Miscellaneous
  • Beta Basic Manual 3 and 4?Hi all, The Beta Basic V3 manual is here in a pdf doc :- [url="ftp://ftp.worldofspectrum.org/pub/sinclair/utils-info/BetaBasicV3.0.pdf"]ftp://ftp.w…

    ... :02, CKay wrote:
    Although BB and SAM-Basic were coded ... Sam ROM Code and Basic.

    More BB stuff coming soon ...
    Steve(spt) Steve(spt) July 2004 Sinclair Miscellaneous
  • Beta Basic Manual 3 and 4?Hi all, The Beta Basic V3 manual is here in a pdf doc :- [url="ftp://ftp.worldofspectrum.org/pub/sinclair/utils-info/BetaBasicV3.0.pdf"]ftp://ftp.w…

    ... />
    BTW which versions of BB do you have? There are ... />
    Sample of Beta Basic code and programs will be in ...
    Steve(spt) Steve(spt) July 2004 Sinclair Miscellaneous
  • Beta Basic Manual 3 and 4?Hi all, The Beta Basic V3 manual is here in a pdf doc :- [url="ftp://ftp.worldofspectrum.org/pub/sinclair/utils-info/BetaBasicV3.0.pdf"]ftp://ftp.w…

    ... .
    The tape versions of BB have a release number like ... ]
    Sample of Beta Basic code and programs will be in ...
    Fred Fred July 2004 Sinclair Miscellaneous
  • Bomb Jack EditorKnocked this up a bit back for psj. Works in conjunction with Multiface. Full instructions are in the [url="ftp://82.30.151.43/"]download[/url]. […

    Nice work BB, I might have a little look at that. I might even delve into the code and see what coding tricks you've used.
    rich_chandler rich_chandler November 2005 Development
  • Writing for MultifaceI was just wondering, is it possible to write a BASIC program, compile it and use the Multiface to run it? I'd like to write a small util to edit te…

    ... wants it.

    BB might still code a Multiface version though.
    mulder mulder December 2005 Development
  • ZX Shed Issue 2...........is available to download! Ok, I know it's late, but never mind eh? [url="http://www.sinclair-heaven.net/sinclair_magazines/zx_shed/Issue2.pdf"…

    ... my Bombjack edit appearing alongside BB's editor. 'Advanced Programmer'? All ... the text.

    The Code Shed section looks really good ...
    mulder mulder December 2005 ZX Shed
  • Getting attribute location from a screen coordinates (x,y)I am having trouble figuring out how to convert an x,y coordinate pair (pointing to a specific pixel) to the location of the attribute for the block …

    ... LLLC CCCC (pixels)

    BB = block (0-2) indicates top ... . Here's a bit of code that does that:

    [code]
    .scr_getattraddr

    ; Computes ... h,a
    ret
    [/code]

    Edit: except that ...
    Alcoholics Anonymous Alcoholics Anonymous April 2006 Development
  • Loading schemes18 years ago I hated loading schemes like Alcatraz and Speedlock because they were a b*tch to copy and became unreliable when the tape got older. Now…

    ... just the next block of code for the next fancy loading ... link to a demo? Woody? BB?). When you look/listen to ...
    JonNorth JonNorth May 2006 Games
  • Cybernoid editorSo, my long tern goal is to make my own Cybernoid or Rex like game (see an ancient thread about Sprite advice)...but my skills are somewhat lacking..…

    This thread makes a fantastic read - thanks 48K and Mr. BB ;).

    Perhaps it might be handy to ask for a new feature in the FUSE debugger - dump disassembly to text file. This way you can dig through all the code in a text editor.
    Paul van der Laan Paul van der Laan February 2007 Development
  • Cybernoid editorSo, my long tern goal is to make my own Cybernoid or Rex like game (see an ancient thread about Sprite advice)...but my skills are somewhat lacking..…

    ... read - thanks 48K and Mr. BB ;).[/QUOTE]
    :)
    [QUOTE=FrankT ... :-(
    BB ;-), any interest in finding/altering the relevant code that checks ...
    48K 48K March 2007 Development
  • ADSL ISP reccomendationsI'm looking to move from Pipex, I'm paying way too much for their 2mb ADSL service. It was good at first, but it's not worth the money now. Demon…

    ... than that, without the code numbers your BB is simply ceased and ...
    dekh dekh March 2007 Chit chat
  • My little first set of routines.Hi all, I just coded a little set of routines just to draw a screen on video mem and a fade out. I could have just copied the screen rendering rout…

    ... into the BB bits -- compare this to your actual subroutine code).

    [quote]
    [code]
    ;---------------------------------------------------------------;
    ; Fade Out ;
    Alcoholics Anonymous Alcoholics Anonymous April 2007 Development
<1…78910111213…34>

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