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  • Beginner's z88dk help rqdI'm struggling to get my first z88dk C program to compile. My program is this: #include <spectrum.h> int main() { zx_border(INK_BLACK); } …

    ... to know the horizontal and vertical pixel shift of the image ... /spectrum

    The compile lines in the .c files were ...
    Alcoholics Anonymous Alcoholics Anonymous June 2017 Development
  • How to automatically find the character set in a gameThis is all completely new to me, so please be patient. I've done some reading up on how character sets are handled by the Spectrum. I understand tha…

    ... allow to offset (or shift) lines of text horizontally by 4 ... similar trick is offsetting the vertical print position by 4 pixels ...
    Hikaru Hikaru June 2017 Development
  • SD Card Interfaces for the ZX Spectrum : the complete list OK I admit it : this thread will start life as the incomplete list of SD card interfaces but the aim is to list the lot

    ... (ie some versions of the Toastrack).

    4) If ... plug/connector orientation is vertical which I personally do ... for some variants of the Toastrack 128k with some variants ... you prefer , horizontal or vertical ? Vertical ones can present a "strain ...
    harriusherbartio harriusherbartio June 2017 Hardware
  • Thinking about my gameAnother long post, I'm afraid. Somewhere on this Forum is a short chunk of text I put up as a sample of what I'd like to turn into a text adventu…

    ... could benefit from more vertical spacing between the lines, and additional spacing ...
    colonel32 colonel32 July 2017 Chit chat
  • What is the maximum fps the spectrum can achieve?I have been doing some reading and from what I understand the Spectrum outputs a PAL signal, but that means it will display @50fps or @25fps? If t…

    ... only the even or odd lines (fields) of a frame are ... the expense of half the vertical resolution. Indeed, if you look ...
    1024MAK 1024MAK August 2017 Hardware
  • Replacing lower RAM 4116 ZX Spectrum 48k - desoldering advice please?A long post, but interesting pictures perhaps. :) I'd like some advice: (also apologies I think I picked the wrong 'Hardware' category for this, plea…

    ... the video display[/url] - cyan vertical bars, half-tiles are darker ... appearing black horizontal 1 pixel lines across the screen.

    Kamineko Kamineko November 2017 Hardware
  • Troubleshooting my +2To put this in context: a while back (i.e. late last year and earlier this year) I was looking to put together a compilation of modern Spectrum games…

    ... clearer but with some obvious vertical shading stripes (which I've ... 't have another +2 or toastrack to compare with. Might this ...
    The Mighty Dopethrone The Mighty Dopethrone November 2017 Hardware
  • Where's Mr Clowder when I need him?What happened to F-Clowder? I hope he's alright and hasn't had some setback keeping him away from here? He got me wound up to do graphics for a game…

    ... its horizontal storage to upright vertical and its difficult to visualize ... is fixed by the centre lines and using the straight line ... swings down from horizontal to vertical, I suppose theres a ... elaborate glass box framing, centre lines and arcs of motion drawn ...
    mik3d3nch mik3d3nch June 2018 Chit chat
  • Fixing a poorly Issue 3 - Odd faults.Here's one for you Spectrum fixers, I warn you it's a long one. I've spent a couple hours this evening doing several repairs on a rubber keyed Speccy…

    ... black paper area, and thin vertical red lines. Now I'm not ...
    Your Spec-chum Your Spec-chum July 2018 Hardware
  • Spectrum 48K / composite mod / LCD TV: voltages out of the ULAHello Spectrum World I have juste bought again my first computer on ebay... a Speccy 48k issue 2 with a 5C112E-2 ULA. Just had to replace TR4 and …

    ... the color bursts during vertical sync, making the vertical sync much longer ... convert some top and bottom lines of the border into sync ...
    paf paf November 2018 Hardware
  • Artillery - projectile motion gameI started writing this around 25 years ago and abandoned it due to performance issues, and a lack of physics knowledge. Bandersnatch on Netflix fille…

    ... generate the terrain is by vertical slices, and the array would ... down (for double, and triple vertical steps per horizontal coordinate, and ... can draw the terrain using lines, or UDG, and the ... shape of the terrain into vertical slices, that´s the brilliant ...
    IvanBasic IvanBasic March 2019 Brand new software
  • Drawing LinesHas anyone got any experience of coding a Bresenham line drawing algorithm on the Speccy? I've had a go and I find the algorithm has quite a few s…

    ... ve been able to draw lines from both ends at once ... done optimal cases for vertical and horizontal lines, with boosts in for ... horizontal steps to draw long lines faster.

    I don ... optimise as they're always vertical whichever way you face (assuming ...
    joefish joefish March 2019 Development
  • Drawing LinesHas anyone got any experience of coding a Bresenham line drawing algorithm on the Speccy? I've had a go and I find the algorithm has quite a few s…

    ... /> ;here, the primary direction is vertical, and the horizontal direction is ... blocks like that:
    1. Vertical, left to right
    2 ... . Vertical, right to left
    3. ... to draw (a lot of) lines into the buffer and then ...
    Lethargeek Lethargeek March 2019 Development
  • Drawing LinesHas anyone got any experience of coding a Bresenham line drawing algorithm on the Speccy? I've had a go and I find the algorithm has quite a few s…

    ... thinking of horizontal lines here, where your example was vertical. I think ...
    joefish joefish March 2019 Development
  • Drawing LinesHas anyone got any experience of coding a Bresenham line drawing algorithm on the Speccy? I've had a go and I find the algorithm has quite a few s…

    ... to work. Ive done the vertical and horizontal edge-clipping too ... step is to try placing lines in 3D and drawing them ...
    joefish joefish March 2019 Development
  • Monochrome monitorsSilly question perhaps, but thinking back were there any games specifically written to be used with a monochrome monitor? Is it true that monochro…

    ... vertical resolution however is fixed, as the number of display lines in ...
    1024MAK 1024MAK June 2019 Games
  • im looking for other games like the muncher that use double height and width graphics with colouri havent come across this type of graphics mode on the spectrum before and would like to know if there are any other games that use it.

    ... doors, and so on). Background lines are zoomed too, but only ... is drawn on screen, vertical stretch is produced. This ... zooming of background, and producing vertical zoom.
    When in ... are scrolled, and presented in vertical zebra stripes.

    ...
    Bedazzle Bedazzle July 2019 Games
  • Starwars IV opening crawl demo---------------------_______________________--------------------------- Starwars IV opening crawl demo on 128K :) [url=https://mega.nz/#!37BV…

    ... horizontal pixel scrolls every few lines to delete a few pixels ... single pixel row, and a vertical scroll that skips a line ... -buffer, with no vertical compression, then do the vertical line-skipping in ...
    joefish joefish July 2019 Development
  • Starwars IV opening crawl demo---------------------_______________________--------------------------- Starwars IV opening crawl demo on 128K :) [url=https://mega.nz/#!37BV…

    ... horizontal pixel scrolls every few lines to delete a few pixels ... single pixel row, and a vertical scroll that skips a line ... -buffer, with no vertical compression, then do the vertical line-skipping in ...
    maeloterkim maeloterkim July 2019 Development
  • RS232 connector dead? No light gun seenHello Today I tried to play some light gun games, which use a controller connected to the 431A socket which is labeled as "RS232" using a BT 4 co…

    [quote="guesser;958328"]On a toastrack? IIRC there's a design ... -on-an-issue-6k-128k-toastrack/[/quote]

    Thanks Guesser ... ) and should drive the input lines to the correct ‘RS232’ voltages ...
    1024MAK 1024MAK November 2019 Hardware
  • Any love for Cholo?I remember really wanting this, but seeing very little coverage on it... so I bought it, and loved it. I always wonder why it never got any covera…

    ... ]Micronaut 1[/i]. The horizontal lines on the ceiling are always ... long as the vertical walls are still simple straight lines, you just ... not clipping all the other lines to [i]avoid[/i] the ...
    joefish joefish February 2020 Games
  • 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 …

    ... post and saw these 4 lines near your "interested in" bit ... with an even distribution of vertical positions (subject to how good ...
    BloodBaz BloodBaz July 2020 Assembler
  • Zynaps scrolling - anyone ever reverse enginnered this?Zynaps has IMO some impressive scrolling - it utilises 18 character rows of the display file, so quite a large active play area, and scrolls 2 pixels…

    ... running. It also supports horizontal/vertical mirroring for these tile strips ... it goes over the character lines, it keeps count of the ... they required. If there are lines which are 'emptier' than a ...
    Hikaru Hikaru July 2020 Games
  • 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 …

    ... post and saw these 4 lines near your "interested in" bit ... with an even distribution of vertical positions (subject to how good ...
    digital digital July 2020 Assembler
  • Test card screenStarted off just messing about in order to test a machine. But ended up with this: [code]10 FOR a=0 TO 0 STEP 0: PAUSE 1: BORDER 1: BORDER 2: BORD…

    ... both a rubber key, plus, toastrack and a +2 grey so ... also any problems with the vertical edges of coloured blocks could ...
    1024MAK 1024MAK August 2020 Sinclair Basic
  • If Sinclair computers had not been sold...I was just having a random thought. If Sinclair Computers (or the rights to them, not sure how it 'worked' back then) had not been sold to Amstrad…

    ... can see a very thin vertical line on the video picture ... decoding (currently it ignores address lines A1 to A7 so that ...
    1024MAK 1024MAK August 2020 Hardware
  • Were the full Sinclair Loki specs ever actually known?I was just curious. A lot was leaked to the media, but the exact specs seem different depending on source. Some say it could support up to 512x256 an…

    ... and comparator, the horizontal and vertical resolution can be whatever you ... vertical resolution being limited by the number of visible video lines (the ...
    1024MAK 1024MAK October 2021 Hardware
  • Robospec (new project, hopefully useful as a tutorial as well)Starting a new project after my graphics investigations. * It's gonna be a Robotron clone since that's not too ambitious (although I'd like to hav…

    ... with drawing a line (horizontal, vertical or diagonal) pointing in the ... need to draw horizontal, vertical and diagonal lines of a set length ...
    Paradigm Shifter Paradigm Shifter July 2022 Development
  • the loading screen.It wasn't so bad in the past, with all the colourful lines during the loading stage. But now that everything has improved so much it is kind of annoy…

    ... past, with all the colourful lines during the loading stage. But ...
    darryll darryll December 2001 Emulators
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Latest Posts

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  • Fixed Speccy Software. And which games remained unfixed?
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  • New video about S-video modification on Issue two 48K Spectrum.
    Renegade on April 21
  • Elusive Strategy Games done by the Smaller or less Prolific Software Houses.
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