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Search Again :: Adv Search 1000 results in 0.008s
<1234567…34>
  • Reason for FLASH attribute?Is it known why Sinclair choose to implement the flash bit in hardware? Since flashing could be easily done with code when needed it seems quite un…

    ... few bits available in the attribute byte for this. Would it not ...
    Rickard Rickard May 2007 Development
  • Animated attribute revealA new challenge to solve next. I would like to create an animated attribute reveal in machine code by having my 768 byte attributes held in ram whic…

    ... animated attribute reveal in machine code by having my 768 byte ... has a diagonal animation of attribute squares moving from top ... which finally reveal the actual attribute of the screen. The ... red, blue then the actual attribute byte. I have a screen shot ...
    Speccy_James Speccy_James February 2014 Development
  • Mode 2 Tile Editor SourceA Timex Mode 2 Tile Editor incorporating a byte mirror table. The compiled version is available in the CSSCGC 2008 collection from the WoS archive. …

    ...
    ld hl,$4508 ; 11th byte
    call expand_byte ;
    ld ... of the
    inc h ; attribute byte held in the a
    attribute area

    org ... /> ; ------------
    ;
    ; A 256 byte lookup table to mirror the ...
    chev chev January 2007 Development
  • Tips on optimizing some newbie assembly routinesI'm starting to learn some assembly language. The best way to learn is to actually code something you are going to use, so I'm creating a very simple…

    ... I will read an attribute byte from the grid of ... per character (character # and attribute) and the table of ... is 1 byte for character index, 1 byte for character attribute)
    ... , we are skipping the attribute character)
    push hl ...
    na_th_an na_th_an June 2009 Development
  • Machine code issue...Hi Folks, My trials with MCODE continue and I am stuck. I wrote the following program in BASIC to simply POKE an attribute byte in to a "box" on th…

    ... BASIC to simply POKE an attribute byte in to a "box" on ... .

    [CODE]1005 REM Attribute Block Routine
    1010 REM ...
    1035 REM p(5)=Attribute
    1045 LET a=22528 ...
    64003=Width
    64004=Attribute

    3A00FA LD A ...
    Paddy Coleman Paddy Coleman September 2010 Sinclair Basic
  • Fastest redraw of screen from UDGsHere's a question for everyone, to generate a bit of code to be used in games: On a standard 48K Spectrum, what's the fastest way to redraw the scre…

    ... have a 768 byte character map with one byte per character, and ... go, you can add an attribute byte to each UDG, or handle ... a time, or the first byte of all 256 chars, then ... the second byte, then the third etc.). It ...
    joefish joefish March 2013 Development
  • Clashbasher a new interface to reduce colour clashI've been working on this for a while now. [IMG]http://markamy.uwclub.net/cauldron.JPG[/IMG] Basicly its an add on for a 48k spectrum, which reinte…

    ... colour just by changing the attribute byte you need to make sure ... can be started whenever an attribute byte is changed, if a corrisponding ... runs down then every byte corrisponding to that attribute byte in the display ...
    Basher Basher August 2013 Hardware
  • misunderstanding screen addressingHi I am just reading mastering machine code Toni Baker: [url]ftp://ftp.worldofspectrum.org/pub/sinclair/books/MasteringMachineCodeOnYourZXSpectrum…

    ... the screen, and also the “attribute byte”. For example,
    consider the ...
    username username April 2014 Sinclair Miscellaneous
  • Raster effects - quick questionHi Guys Just a quick question regards what the ULA is doing as its drawing each scan line. Assuming the beam has finished drawing the border, am I…

    Hi Guys

    Just a quick question regards what the ULA is doing as its drawing each scan line. Assuming the beam has finished drawing the border, am I correct assuming its reading a byte of screen ram then an attribute byte, and so on...?
    Dax Trajero Dax Trajero August 2019 Development
  • C64 & Spectrum loadingscreens!I was bored today, so I decided to compare some stuff. :) [url="http://www.lemon64.com/loadingscreens/"]http://www.lemon64.com/loadingscreens/[/ur…

    ... change the colour of an attribute square quickly enough - with ... 8 pixels and a single attribute byte for the 8 pixels ... . To access a specific byte, you need to place ... bytes and a full 32 attribute bytes into a buffer ... 3.5 z80 cycles per byte: ie the z80 would ...
    Alcoholics Anonymous Alcoholics Anonymous February 2004 Games
  • EmuZWin supports 256 color gamesI am sorry starting new topic, but you see this info is important a bit: new version 2.4 of the EmuZWin is available to download, and it supports 25…

    ... to muck about with the attribute byte to fix certain things. For ... screen it uses lot of attribute tricks to get around the ... or different colour altogether! The attribute cycling is also responsible for ...
    Arjun Arjun April 2004 Emulators
  • 256 colour gamesFollowing on from the thread in the Emulator section... Will people who are working on converting games to 256 colour using Emuzwin please let me kn…

    ... sprites they just set the attribute byte to PAPER 1, INK 1 ...
    na_th_an na_th_an April 2004 Games
  • Emulation accuracy and how it affects softwareHi folks. I was thinking of bodging together a rudimentary Spectrum emulator myself, not as a competitor to the other emulators, but as an integrate…

    ... port $ff until a certain attribute byte is read from screen memory ...
    Alcoholics Anonymous Alcoholics Anonymous May 2004 Emulators
  • Mysterious bit of codeHi everyone, I found the follow piece of code in a game and was wondering what it does. ld bc,40ffh ld e,40h loop ld a,r …

    Waits until the screen or attribute byte being read by the ULA for display is equal to 64.
    AC944 AC944 August 2004 Sinclair Miscellaneous
  • 128k Shadow Screen?When emulating the shadow screen in bank 7 should that bank be switched into address C000? If so, what happens if bank 7 is switched out without canc…

    ... /> The Z80 reads the first byte of bank 5 by reading ... can load a screen attribute byte and a byte of pixel data in ...
    Unique Unique February 2005 Development
  • 128k Shadow Screen?When emulating the shadow screen in bank 7 should that bank be switched into address C000? If so, what happens if bank 7 is switched out without canc…

    ... /> The Z80 reads the first byte of bank 5 by reading ... can load a screen attribute byte and a byte of pixel data in ...
    cyborg cyborg February 2005 Development
  • Speed of blinking L on a Speccy???Friend of mine and I have had a "discussion" (close to a game of fisticuffs) about how fast it takes to invert the attribute for the blinking L (or t…

    ... /> movzx ecx, byte ptr [ecx] ; ecx = display byte
    mov ...
    movzx eax, byte ptr [eax] ; eax = attribute byte

    ... br />
    movzx eax, byte ptr [FlashSwapTable+eax] ; read ...
    Woody Woody March 2005 Sinclair Miscellaneous
  • The ULA and ScreenI've asked something similar before but please bear with me. I'm trying to understand the way the screen is controlled. The ULA controls output to …

    ... ULA grabs a screen byte and a single attribute byte in pairs and ... would have to fetch each byte twice from memory and that ...
    Alcoholics Anonymous Alcoholics Anonymous November 2005 Hardware
  • The ULA and ScreenI've asked something similar before but please bear with me. I'm trying to understand the way the screen is controlled. The ULA controls output to …

    ... ULA grabs a screen byte and a single attribute byte in pairs and ... would have to fetch each byte twice from memory and that ...
    Dunny Dunny November 2005 Hardware
  • The ULA and ScreenI've asked something similar before but please bear with me. I'm trying to understand the way the screen is controlled. The ULA controls output to …

    ... 's 8 pixels and an attribute byte. An easy extension is to ... modify the addressing of the attribute fetched to get the Timex ... is to use that 2nd byte fetched as another 8 pixels ...
    Alcoholics Anonymous Alcoholics Anonymous November 2005 Hardware
  • The ULA and ScreenI've asked something similar before but please bear with me. I'm trying to understand the way the screen is controlled. The ULA controls output to …

    ... 's 8 pixels and an attribute byte. An easy extension is to ... modify the addressing of the attribute fetched to get the Timex ... is to use that 2nd byte fetched as another 8 pixels ... of 8x8 pixels, the same attribute byte is read by the ULA ...
    monty.mole monty.mole November 2005 Hardware
  • The New SPIN releases ThreadOk, as I'm now working on SPIN again full-time, and as a very wise man once said, "Release Early, Release Often"[1]... I'm going to release new SPIN…

    ... loading from tape, if an attribute byte is changed, flashloading aborts and ...
    Arda Arda September 2006 Emulators
  • The New SPIN releases ThreadOk, as I'm now working on SPIN again full-time, and as a very wise man once said, "Release Early, Release Often"[1]... I'm going to release new SPIN…

    ... loading from tape, if an attribute byte is changed, flashloading aborts and ...
    Dunny Dunny September 2006 Emulators
  • The New SPIN releases ThreadOk, as I'm now working on SPIN again full-time, and as a very wise man once said, "Release Early, Release Often"[1]... I'm going to release new SPIN…

    ... loading from tape, if an attribute byte is changed, flashloading aborts and ...
    pigdog pigdog September 2006 Emulators
  • Spectrum Screen Memory MapWhat's the advantage (mistery?) behind ULA's spectrum screen memory interpretation? 6144 bytes divided into 3 blocks, 2048 bytes long. if you want t…

    ... for LO byte, and two HI bytes for bitmap/attribute) instead of ... followed by two bytes of attribute address).
    [/QUOTE]
    ... :-)

    Considering that one byte atribute is for 8 bytes ... result in 8 times less attribute byte load - just once for ...
    piters piters October 2006 Development
  • Spectrum Screen Memory MapWhat's the advantage (mistery?) behind ULA's spectrum screen memory interpretation? 6144 bytes divided into 3 blocks, 2048 bytes long. if you want t…

    ... that tries to fetch the attribute byte once for each 8x8 pixel ... have a 32 byte buffer to store 32 attribute bytes that get ... a new set of 32 attribute bytes when in the first ...
    Alcoholics Anonymous Alcoholics Anonymous October 2006 Development
  • Multiple loading screens[i]Action Biker[/i] suffers from having to endure multiple loading screens. Any other games that have this annoying "feature"?

    ... 8 pixels: one pixel byte and one attribute byte. To get more than ... one attribute per 8 pixels the ...
    Alcoholics Anonymous Alcoholics Anonymous October 2006 Games
  • Multiple loading screens[i]Action Biker[/i] suffers from having to endure multiple loading screens. Any other games that have this annoying "feature"?

    ... 8 pixels: one pixel byte and one attribute byte. To get more than ... one attribute per 8 pixels the ... above, you'd carefully used attribute blocks to minimise clash! That ...
    48K 48K October 2006 Games
  • Speccy graphics on CBM64The recent "Starquake" thread had me browsing through Steve Crow's portfolio of games and I was quite surprised when following the links to the CBM64…

    ... each character cell has an attribute byte associated with it, as on ...
    monty.mole monty.mole November 2006 Games
  • Speccy graphics on CBM64The recent "Starquake" thread had me browsing through Steve Crow's portfolio of games and I was quite surprised when following the links to the CBM64…

    ... each character cell has an attribute byte associated with it, as on ...
    Matt_B Matt_B November 2006 Games
<1234567…34>

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