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<1234567…34>
  • Display half a screenWorking in 128 Basic and saving screens to memory via - SAVE! "image" SCREEN$ . Is it possible to display just the top half (or the bottom half) of t…

    Working in 128 Basic and saving screens to memory via - SAVE! "image" SCREEN$ . Is it possible to display just the top half (or the bottom half) of the screen ? (leaving the bottom half of the previous screen visible). Thanks in advance.
    Nonsense in BASIC Nonsense in BASIC October 2011 Sinclair Basic
  • Adding TAP file contents to a Spectrum +3e DOS PartitionHello my fellow WoS'ers, This thread is a companion to a great little guide from a fellow AmiBayer [B]mnjnurney[/B] you can view his thread by [URL…

    ... a simple statement line that changes the screen to black< ... RAM TOP. Now like the previous SCREEN$ loading statement - as we ... [/code]This line prints (at the information line - line 22) in bright ... br />
    line 9999 clears the screen, informs the user that ...
    Zetr0 Zetr0 January 2013 Games
  • IZX: a new standard format and driver for ZX-Spectrum icons[B]IZX[/B] is a very compact and efficient standard format to create icons for the ZX-Spectrum. You can download it from here: [LIST] [*][URL="http:…

    ... attribute area on screen,
    with an additional pixel line/column in ... /> The demo contains this loading screen, intended to help understand the ... />
    As indicated in a previous screen, Andrew Owen and I have ...
    Einar Saukas Einar Saukas July 2013 Brand new software
  • Fastest emulator screen renderingHi, I'm developing an algorithm for fast emulator screen rendering and here is what I came up with. 1) Use 4bpp indexed image format as target …

    ... algorithm for fast emulator screen rendering and here is ... .[code]byte=next screen byte // get next screen byte
    ... offsets from 16384 for each screen line as[code]uint16_t offsets[ ... 32 bytes from speccy screen for every line directly into bitmap) ...
    tstih tstih November 2019 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 …

    ... LD DE,(SPRADR) ;taking precalculated screen address where to draw sprite ... back on the screen
    INC DE ;increase screen address
    ... LD L,A ;of the previous bytes of sprite and mask ... INC D ;move down one screen line
    LD A,D ;and ...
    dmsmith dmsmith August 2004 Development
  • help sought with first foray into machine code - pixel scrolldownI have started to code my first machine code program, a simple roadrace game. I've based it around the pixel scrolldown routine in 40 Best Machine Co…

    ... the scrldn heading), one pixel line apart, with various filters to ... to go back to the previous pixel line. The code works, so ... faster way to make the screen scroll down by one pixel ...
    bigjon bigjon February 2008 Development
  • Problem with BC corrupting after DJNZJust for fun, I'm messing around trying to get the level maps from Lemmings to display on the screen with machine code. It's been ages since I did an…

    ...
    LD DE,16384 ; SCREEN START ADDRESS
    LD A ... br /> LDIR ; DO A LINE OF THE SCREEN, 32 CHARS
    POP ... /> CALL LOWER ; DROP DOWN A SCREEN LINE
    LD A,(SLN) ; RESTORE ... ; COPY THE ATTRIB FROM THE PREVIOUS SQUARE, ADVANCE AND LOOP
    mulder mulder January 2016 Development
  • Issue with TV signal + Inductor Coil (16K Issue 2 Speccy)Hello guys, I just got a 16K Issue 2 Speccy from eBay. It was sold as not working so I knew there would be some work needed before it's working ag…

    ... the previous edit line to appear at the bottom of the screen, with ...
    1024MAK 1024MAK August 2017 Hardware
  • NEW INTERFACE FOR ZX SPECTRUM!!Hi all zx-maniax! Here is a letter from Polish inventor, Yarek Adamski. He constructed a new brilliant interface for ZX SPECTRUM. Ready carrefuly i…

    ... can generate interrupts on every screen line as Sam
    do.
    Yerz Yerz July 2003 Sinclair Miscellaneous
  • Scorpion-timed demosHi, I'm looking for half a dozen or so demos that are timed specifically for the Scorpion ZS 256. The main requirement is that the demo must genera…

    ... check that the border and screen line up correctly in Spectaculator in ...
    Jon Needle Jon Needle September 2003 Sinclair Miscellaneous
  • ScanlinesHere's an excerpt from the FAQ: [quote] Now for the timings of each line itself: define a screen line to start with 256 screen pixels, then border, …

    ... the timings of each line itself: define a screen line to start with ... 256 screen pixels, then border, ... at each side. A video screen line is therefore timed as follows ... : 128 T states of screen, 24 T states of right ...
    GOC GOC July 2004 Development
  • Does ScanLine[0] have a left border?My emulator couldn't handle Cobra or ShortCircuit so I added some rough port FF values. I now want to make it a bit more accurate. The FAQ gives me a…

    ... After an interrupt occurs, 64 line times pass before the byte ... />
    "define a screen line to start with 256 screen pixels, then border ... is at Screen[48,64] (48 pixels of border, 64th line down ... ) Skipping ahead to line 311 - the last line. What happens to ...
    Unique Unique February 2005 Development
  • Punk StarHello everybody. I'm Sorry if my English is bad, I'm from Spain. I have a problem on the screen in which the cave finishes and begins the castle(t…

    ... have a problem on the screen in which the cave finishes ... .I cannot enter on the previous screen of the drawbridge

    arkos arkos November 2007 Games
  • Name the game #46,103Hi I'm looking for a particular game, zx speccy-wise. I played it I think in 1986? Along with Danger Mouse in the Black Forest Chateuax, Kokotoni Wi…

    ... and deposited you at a previous screen, to score points and get ...
    xyzzy xyzzy January 2013 Games
  • TommyGun with AGDHi everyone, I have been working with Jonathan to incorporate his excellent Arcade Game Designer utility into TommyGun. Jonathan has created a compi…

    ... edit the sprites on a screen.
    Again fairly ... TommyGun map tools to layout screen tiles.
    The Objects ... place unique objects on a screen.
    Remember if ... an object from a previous screen then it is moved ... to the new screen.
    You can ...
    Kiwi Kiwi February 2013 Development
  • Scrolling by 2 pixelsWhat is the fastest way of scrolling a Spectrum screen line by 2 pixels left or right? When thinking about it I've come to this simple solution: [C…

    ... way of scrolling a Spectrum screen line by 2 pixels left or ...
    Ralf Ralf August 2013 Development
  • ULA snow effectIt's wintertime, you know. [quote="http://ramsoft.bbk.org.omegahg.com/floatingbus.html"]when the I register falls in the range 0x40-0x7F then the UL…

    ... videoram to draw the screen), with the result that ... pattern is displayed on the screen.
    In detail, ... on the 48K. The screen bytes are fetched during ... for the duration of a screen line (128 tacts) so that ... every other column of the screen
    - Why the ' ...
    Hikaru Hikaru January 2014 Development
  • Camelot WarriorsPlease add the following "known errors" description to [URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0000794"]Camelot Warriors[/URL]: [QUOT…

    ... ]Whenever you die in a screen, you restart at the same ... , if you jumped from a previous screen and fell on an enemy ... in this new screen, you will restart in mid ...
    Einar Saukas Einar Saukas October 2014 Infoseek database
  • ZX Diagnostics v0.33 releasedHi everyone, I'm pleased to announce the release of v0.33 of zx-diagnostics. This release contains the following changes: - ULATest: Detect …

    ... soak testing
    - General: Splash screen (line) on startup to inform user ...
    balford balford April 2016 Hardware
  • [Asm] Is this nested loop faster than LDIR or a bunch of unrolled LDI's?Hi all. I'm learning Z80 asm on Speccy 48K, and to start with I decided to write my own "CLS" routine (without relying on ROM calls or LDIR) as a lea…

    ... de ; Move back to the previous attributes address.
    djnz ... c ; Move up to the previous row.
    jp nz, ... de ; Move back to the previous screen address.
    djnz cls_screen_loop ; ... c ; Move up to the previous row.
    jp nz, ...
    ST1 ST1 November 2018 Development
  • ScanlinesHere's an excerpt from the FAQ: [quote] Now for the timings of each line itself: define a screen line to start with 256 screen pixels, then border, …

    "define a screen line to start with 256 screen pixels, then border, then [B]horizontal retrace[/B], and then border again."

    Next line.
    cyborg cyborg July 2004 Development
  • Pixel setting / general speccy codingi just started doing some cross-coding with the [url="http://www.bigfatpanda.fsnet.co.uk/z80.html"]Z80 SNA assembler[/url] and an emulator, and this …

    ... of the start of a screen line is the fastest there is ... and adding that onto the line address.

    As a ...
    dmsmith dmsmith August 2004 Development
  • On 48k, can I copy 4k before next screen updateFollowing on from my thread at [url="http://www.worldofspectrum.org/forums/viewtopic.php?topic=6423&forum=11"]http://www.worldofspectrum.org/forums/v…

    ... or immediately after the first screen line has been drawn - and you ...
    gasman gasman September 2004 Development
  • Sprites flickeringI am trying to write a Spectrum game in machine code. I am still a beginner in programming, however I did much progress recently, i believe. Now I am…

    ... drawing your sprite to the screen before the raster has ... the point on the screen that you are drawing ... 2 thirds of the screen are where the sprites ... to the top of the screen (display file). Using the ... etc. take 228 tstates per screen line. Hope this is of ...
    dmsmith dmsmith October 2004 Development
  • demo makingHow do you make a demo containing lots of pictures, I can only see how to make a string of screen$ like in a couple of animations by Anestis (sorry I…

    ... ]

    First screen is a full (compressed) screen all the other ... displaying the changes to the previous screen.

    And now 16 ...
    Dr BEEP Dr BEEP May 2005 Sinclair Basic
  • Games Club - Week 22Hi All. Last week I asked you to nominate games for which Jonathan Dunn provided the music, I received these nominations The Addams Family Chase H…

    ... the where you entered the screen. As a result, you can ... vicious design, too. On one screen I had to jump on ... jump, went back to the previous screen to 'reset' the ghost's ... catch anyone re-entering that previous screen. Arrrrgh!

    The fact ...
    Zagreb Zagreb August 2005 Games
  • BASin release 12a available for downloadChristmas has arrived early, and the new release of BASin is ready for you lot to point out errors, inconsistencies and bugs. Get it here: [url="ht…

    ... last line

    with the cursor underneath the previous last line (ie ... , the last line of the UDG ... lines up resulted in the line being entered into the ... updated the UDG data my line 9950 got deleted.
    ...
    woodcock88 woodcock88 October 2005 Sinclair Basic
  • BASin release 12a available for downloadChristmas has arrived early, and the new release of BASin is ready for you lot to point out errors, inconsistencies and bugs. Get it here: [url="ht…

    ... last line

    with the cursor underneath the previous last line (ie ... , the last line of the UDG ... lines up resulted in the line being entered into the ... updated the UDG data my line 9950 got deleted.
    ...
    Dunny Dunny October 2005 Sinclair Basic
  • Help, my Sprite Code wont workI have zipped it all up here: [url="http://www.peargames.co.uk/downloads/galagorf.zip"]http://www.peargames.co.uk/downloads/galagorf.zip[/url] If y…

    ... back and forward along a screen line as the high byte won ... change on a 32 column line. Your back buffer is 24 ... a 256 byte boundary mid line. Try changing the dec e ...
    dmsmith dmsmith December 2005 Development
<1234567…34>

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