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<1…567891011…34>
  • z88dk v1.99A Release Candidate[b]Z88DK VERSION 1.99A RELEASE CANDIDATE[/b] Download from: http://nightly.z88dk.org/Releases/ The release candidate will be available for te…

    ... [code]
    EXTERN base_graphics ; Address of graphics screen

    EXTERN ... Can you check your path variable "echo $PATH" and ... /> The new side of z88dk is completely independent ... /> Yes some sort of makefile should accompany that windows ...
    Alcoholics Anonymous Alcoholics Anonymous December 2015 Brand new software
  • 128K programmingDoes anyone know any good resources on assembly programming for the 128? All I'm after is an "idiot's-getting-started-guide" on how to utilise the…

    ... br /> LD HL,49152 ; start address of data to copy
    LD ... 16384 bytes of data have been transferred to address 49152. From ... to exceed 11264 bytes of data instead of 16384, otherwise on ... first +3 system editor workspace variable, thus causing a system ...
    Alessandro Grussu Alessandro Grussu February 2016 Development
  • BASIC problem in SpectaculatorI have a piece of music written in +3 BASIC in spectaculator (using FOR LET, PLAY and NEXT) and when it auto loads (because of save "tune" LINE 10) i…

    ... of the auto-run line number is being interpretted as the address of ... the start of the BASIC variables area ... chance is the first variable you define one of the string variables ... look at the VARS system variable.
    GReW GReW March 2016 Emulators
  • z88dk v1.99A Release Candidate[b]Z88DK VERSION 1.99A RELEASE CANDIDATE[/b] Download from: http://nightly.z88dk.org/Releases/ The release candidate will be available for te…

    ... the access to RAMTOP system variable. The way you had it ... was through a pointer variable:

    [code]
    ;; ... ;; hl holds pointer value = $5CB2 = address of RAMTOP system var
    ld ... RAMTOP" that is placed at address $5CB2 so that the ...
    Alcoholics Anonymous Alcoholics Anonymous April 2016 Brand new software
  • Quill or PAWI'm thinking of putting-together (by which I mean writing) an adventure game for the Speccy. The two most popular utilities for doing so seem to be t…

    ... ), but there's no indication of how to do it in ... the BASIC CHARS System Variable at the start address of your font minus ...
    GReW GReW April 2016 Development
  • Meaning of Format Byte of a TRDOS DiskDoes anybody knows the Meaning of the Format Byte (Byte 227 in Sector 8 (Sector Count from 0) in Track Zero) of a TR-DOS Disk (Real Disk of a Bet…

    ... check. Sets the drive type variable.

    #405 CALL #3FD ...
    Hikaru Hikaru August 2016 Hardware
  • Where does the BASIC program sit 48K Spectrum memory?Hi there First post so be gentle, I've had a spectrum since the 80's and have recently started programming it for fun again. I wrote the followin…

    ... won't allow the freedom of POKEing or even PEEKing anywhere ... you can get a memory address of a variable through a pointer, but ... . It might be a "virtual" address too, i.e. not the ... actual "real" ("physical") address but I'm not sure ...
    textvoyage textvoyage September 2016 Sinclair Basic
  • The state of source level debuggingI was just wondering if we can put on a table everything we collectively know about source level debugging for ZX Spectrum to get an overview of curr…

    ... came (program counter address is payload of the ready command ... the address of the start of that C line (address can ... giving starting address of loaded program as address. The monitor ... of some variable (i.e. a watch) the PC would calculate symbol address ...
    tstih tstih November 2016 Development
  • How to get more than 21 UDG's in BASIC?So with graphics mode under the G cursor how many UDG's can you do from BASIC is it 21? It's all POKE 65368 and above and it's sequential ABCD.... an…

    ... ]256 less[/i] than the address of the bit-pattern for space ... first part (in the beginning) of a standard (not only Speccy ... system variable not to a first character, but to another address (256 ...
    Bedazzle Bedazzle November 2016 Sinclair Basic
  • Thought this would be simple... Z80Hi Folks, Started to read "Beyond simple BASIC, Delving Deeper into your ZX Spectrum" by Dilwyn Jones. This is a great book and I came across the…

    ... ,NEW_B1 ; Address of masked sprite data
    ld de,PNT_B1 ; Address of pointer data ... hl,23560 ; LAST K system variable
    ld (hl),$00 ; Put ...
    Paddy Coleman Paddy Coleman September 2017 Development
  • Randomised data samplingHere is something that could be written in BASIC, if anyone is interested. Lets say we want to sample a subset of a larger population, we can do t…

    ... (preserved)
    it = start address of 1st a$() row in ATTR ... screen
    pt = start address of 1st a$() row in VARS ... (preserved)
    pd = start address of 2nd a$() row in VARS ... totals
    n = loop control variable
    [/code]
    [code ...
    Battle Bunny Battle Bunny June 2020 Sinclair Basic
  • How to write a simple C+asm horizontal scrolling game (Tutorial, z88dk)[b]How to write a simple C/asm horizontal scrolling game[/b] [b]Note:[/b] This tutorial has multiple parts... I am still writing but this first pa…

    ... helps to find the start address of a location, and it's ... the character code, find the address of that character in spectrum ROM ... />
    In "char y;", a variable is declared. Other than that ... game_over variable, and use it to end the game instead of while ...
    Timmy Timmy September 2020 Development
  • How to apart a 16K from a 48K?How can I understand that if i have a 16K or 48K? Thanks

    ... 128 cycle (7 bit) refresh, address bit A7 (register bit 7 ... sets a system variable that contains the highest address of ‘working’ RAM.
    1024MAK 1024MAK April 2021 Sinclair Miscellaneous
  • Paging for 64Kb of Video Ram??? What is the best way to page this?Hi all, I'm just putting together a concept card for a "Loki" style of video card, which supports shadow ( so it fits a normal Speccy ) and also t…

    ... of pixel depth, could support sprites of variable sizes.

    Usefully, most of ... to LCDs to address a modern lack of CRT displays. < ... the larger addressing space of the z280, and even ...

    But most of that thinking came from backwards ...
    cj7hawk cj7hawk October 2021 Hardware
  • How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…

    ... /> You can't do cp address, value (and that's not ... , level (which is just the address of the variable, hence 16 bits, you ... with the 8 bit CONTENTS of the address of the variable level.
    Paradigm Shifter Paradigm Shifter July 2022 Development
  • a questionwho can tell us the peek-poke address of the ZX Spectrum Ram Top??

    who can tell us the peek-poke address of the ZX Spectrum Ram Top??
    Andy Andy April 2001 Sinclair Miscellaneous
  • 2 questions regarding partial port decoding1) What happens if the Spectrum reads from a port whose number matches the criteria for more than one device ? Does only one of the devices get to r…

    ... br />
    Does only one of the devices get to receive ... ?

    An example of a troublesome command would be ... 31", corresponds to a port address of "????????00011111", but what are the ... /> Somebody please put me out of my misery :( :(.

    [ ...
    GOC GOC August 2004 Development
  • need help with speed optimization. this procedure draws a sprite with mask from memory onto the screen with x-coordinate in pixels. it doesn't shift sprites in realtime, it just uses …

    ... ,A ;| so, in HL - address for shift table into one ... side, in DE - address for shift into another side ... HL,(SPRADR) ; taking precalculated screen address where to draw sprite
    CALL DRAWCH1 ;returns an address of next bottom line on the ...
    moroz1999 moroz1999 August 2004 Development
  • Machine Code Sprites Example Code Using Char Based SystemBelow is my WIP code to do smooth screen wrapping sprites using char positions and offsets, as opposed to writing direct to a line (0-191) and shifti…

    ... /> ; HL Contains Screen Address
    ; DE Contains Char Address
    ; On Exit ... />
    ; ACHAR

    ; Calculate address of char

    ; On Entry ...
    robpearmain robpearmain August 2004 Development
  • IM2 Machine Code Sprites Example Code Using Char Based SystemFurther to my earlier post, here are sprites running using char method with IM2 driving it Note, for 48k spectrum using TASM [code] ; ***********…

    ... Contains Screen Address
    ; DE Contains Char Address
    ... ACHAR

    ; Calculate address of char

    ; On ... /> ; HL Contains Screen Address
    ; BC preserved ...
    robpearmain robpearmain August 2004 Development
  • Looking for Russian or Eastern SpecchumsAs some of you might know, the Speccy Tour 2004 is near. We're pretty happy with both UK and Spanish players participation. But something tells me th…

    ... there should be more players of Russia, Ukrania and overall the ... /> * At least, point me the address of some Eastern web master that ... we'll release the games of this year very soon. All ... that there is industrial amounts of cheatingbastness :)

    ...
    Sabre Sabre September 2004 Games
  • Smooth Screen Scrolling RoutineHi everyone, this is a follow up to the thread on smooth screen scrolling. As promised here is the code for the routine. It's pretty long and fairl…

    ... the start
    * address of graphics for that particular tile ... SCRMODA LD DE,16388 ;screen address of top left
    ; ... /> ADD HL,BC ;HL = ADDRESS OF PRESHIFTED BLOCK

    ;DE=address of tile graphics

    ...
    dmsmith dmsmith September 2004 Development
  • YSRnRY documentary - BitTorrent problemsWell, I installed that new ADSL modem/router/switch thingy, and there's a slight hitch. The IP address of obdwww.egyptus.co.uk is 80.168.134.171, an…

    ... hitch.

    The IP address of obdwww.egyptus.co.uk is ... as a second IP
    address.

    I've tried ... everything I can think of, so I'm open to ... suggestions.

    The maker of the router says it cannot ...
    NickH NickH October 2004 Sinclair Miscellaneous
  • Can anyone recommend website builder softwareI need some software that is simple to use ie u can drag photos from your hard drive and place them on your web page, needs no programming knowledge …

    ... u tell me the web address of a site using your suggested ...
    swordheart swordheart November 2004 Sinclair Miscellaneous
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Latest Posts

  • I am currently watching.....
    Paradigm Shifter on 12:49AM
  • New video about S-video modification on Issue two 48K Spectrum.
    Renegade on April 21
  • Fixed Speccy Software. And which games remained unfixed?
    John Elliott on April 21
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    rich_chandler on April 21
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    mel the bell on April 21
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    harriusherbartio on April 21
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