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<1234567…34>
  • Math Quiz - MultiplicationThe topic is fast multiplication routines, from 8x8 to 32x32 and all points in between. These functions sit underneath floating point libraries, gen…

    ... point where it takes a silly amount of memory for tables ... ; hl = E * H

    ; shift left eight bits

    ld ... an 8x8 multiplication and shifts left 8 bits.

    ... call+ret and 8-bit shift left, costing an additional 43 cycles ...
    Alcoholics Anonymous Alcoholics Anonymous January 2014 Development
  • Worst. Controls. Ever.Right... time to have a vote on the worst keyboard controls ever! Here's some suggestions to start you all off: (1) The standard cursor keys. Need …

    ... as Sabre WUlf, with 6=left, 7=right, 8=up, ... (4) Super Robin Hood. A=left, X=right, K=up, N ... up/down and which was left/right...

    (5 ... T=up, B=down, F=left, H=right, 4=fire. ... " contender: Jumping Jack. Symbol Shift=left, Space=right may have worked ...
    The Mighty Dopethrone The Mighty Dopethrone October 2003 Games
  • RFC: 64 column font codeIn BASIC, type CLEAR 49999 then import the code at 50000. Then type RANDOMIZE USR 50000. This will create a new channel and attach stream #4 to it. A…

    ... bit 0-2
    rlca ; shift
    rlca ; five
    ... screen address

    ; left nibble on left hand side

    rrca ; shift right
    rrca ; four ... byte of font
    rlca ; shift left
    rlca ; four bits
    chev chev January 2007 Development
  • Dirty SpectrumsI have a Spectrum+ computer which has come from a smokers house unfortunately. Although coated in nicotine (I hate to think the state of their lungs…

    ... not work - EXTEND MODE, SYMBOL SHIFT (left hand one), " and
    rwap rwap May 2010 Hardware
  • Merlin has risen from the grave!Those of you following the Merlin saga [thread=29902]over here[/thread] might be slightly interested to know that the program is now available in the…

    ... or keys:
    CAPS SHIFT - Left, CAPS SHIFT + M - Left + Up
    Z - Right ...
    Battle Bunny Battle Bunny June 2010 Games
  • DK?Tronics keyboard troubleI have a DK?Tronics keyboard here, which is causing some trouble. Physically it?s in great shape, but some keys simply do not work. The non-working k…

    ... , d, j, k, Symbol Shift, Left Caps Shift
    and on the ten ...
    schombi schombi September 2013 Hardware
  • Rendering clipped glyphSometimes you need to render a glyph of arbitrary size to the screen. And clip it. For example: drawing a mouse cursor means combining drawing of a…

    ... that you will need to shift everything 2 bits to the ... the optimal generic algorithm to shift for N bits...also note ... sometimes it is faster to shift left for the same effect).
    tstih tstih October 2013 Development
  • Tutorial: Using UDGs in SpecBASSpecBAS is capable of using graphics mode, in a similar manner to the original Spectrum. Like most things though, the extended nature of SPecBAS's ab…

    ... Shift+9. On SpecBAS, there are two methods:

    Left-Ctrl + Left ... -Alt: Temporary graphics
    Shift + Left-Alt: Permanent ... graphics mode until you press shift+alt again.

    left of the byte) to ...
    Dunny Dunny May 2018 Sinclair Basic
  • 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 …

    ... pixels shift left
    256 - 3 pixels shift left
    256 - 4 pixels shift left
    256 - 5 pixels shift left
    256 - 6 pixels shift left
    moroz1999 moroz1999 August 2004 Development
  • Games that have become part of your history ...I started playing Starquake form Bubble Bus software in the mornings for a while before going to school as it was a great unplug. I still play and h…

    ... button... (if you press CAPS Shift+LEFT+RIGHT the whole memory - whole ...
    FRGT/10 FRGT/10 June 2005 Games
  • Podder (1986)An obscure game that sold for just 99p back in the day, it's not bad actually. But having played it for a couple of days, I have nowhere to go. Basic…

    ... behind the tank with Shift+Direction (eg. Shift+Left to drop a mine ...
    Battle Bunny Battle Bunny March 2006 Games
  • D80s and multifaces etc..Hi everybody, Just wondering, is there any known good way of taking snapshots onto a D80 disk? If not I'm thinking of writing a new ROM for my multi…

    Have you tried pressing CAPS SHIFT + LEFT ARROW + RIGHT ARROW? ;)

    [ This Message was edited by: FRGT/10 on 2006-03-06 18:46 ]
    FRGT/10 FRGT/10 March 2006 Sinclair Miscellaneous
  • Project: M.u.l.e.Wokani came up with a great idea about trying an open-development approach for spectrum games, and I thought why not try with a game I have under dev…

    ... = 16; // initialize current scroll shift
    g_scrollPos = g_textBuffer; // ... g_scrollShift = 15; // initialize scroll shift for next char in message ... causes the scanline to shift left one pixel, leaving ...
    Alcoholics Anonymous Alcoholics Anonymous October 2007 Development
  • Games on a D80 based systemHi everybody..... I need to satiate my urge to play Knight Lore. Never did finish that game. To do so I need a good way of getting it onto at least…

    ... Kompakt when you press CAPS SHIFT + LEFT + RIGHT, it saves the memory ...
    FRGT/10 FRGT/10 November 2007 Sinclair Miscellaneous
  • MGT2TAP ReleasedThere are some goodies included: Real Disc reading/writing, consistency check, Screen viewer, automatic syntax replacer... You can find MGT2TAP on my…

    ... +A.

    Left shift key whilst pressing left mouse to select multiple ... ). :Surprise: I have not activated Left shift+Left Mouse button. Maybe it is ...
    LCD LCD July 2009 Announcements
  • C Programming question*bangs head* So not a c programmer. I know bitshifts are << and >> But what does <<= mean? I'm trying to work out an algorithm to implement in z…

    They're shortcuts. What it's saying is 'var = var
    joefish joefish February 2010 Development
  • C Programming question*bangs head* So not a c programmer. I know bitshifts are << and >> But what does <<= mean? I'm trying to work out an algorithm to implement in z…

    ... ;426045]
    There are different shift and rotate instructions depending on ... is unsigned, does a logical shift

    s >& ... is signed, does an arithmetic shift.

    You can cast ...

    does a logical shift

    and

    Paradigm Shifter Paradigm Shifter February 2010 Development
  • C Programming question*bangs head* So not a c programmer. I know bitshifts are << and >> But what does <<= mean? I'm trying to work out an algorithm to implement in z…

    ... is unsigned, does a logical shift

    s >> ... is signed, does an arithmetic shift.[/quote]

    Which C ... to? C99 explicitly leaves right-shift of a signed integer as ...
    Philip Kendall Philip Kendall February 2010 Development
  • shifting spriteshi. have anyone experience with shifting sprites by table ? some neat tricks ? i don't want to see complete code (really don't want, it trashes thr…

    ... of the sprites also shift them across by 2 ... animate as they move left or right. The disadvantage ... What really slows down a shift left/right by n pixels using ... far you have to shift the pixels left or right, it ... where you can more easily shift 16- and 32-bit ...
    joefish joefish February 2010 Development
  • Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …

    Any letter consist of 8 codes.

    First code do nothing (it is a blanc)
    next 2 shift to rught
    next 2 do nothing
    next 2 shift left
    last code do nothing.
    Dr BEEP Dr BEEP April 2010 Development
  • Brand new Horace GameWe could think on how should the next Horace Game be, taking in account that the past three are mixtures of old, well established classic arcade game…

    ... />
    You update the scroll (shift left) area while ULA is drawing ...
    Tom-Cat Tom-Cat July 2010 New game ideas
  • Brand new Horace GameWe could think on how should the next Horace Game be, taking in account that the past three are mixtures of old, well established classic arcade game…

    ... ;459992]You update the scroll (shift left) area while ULA is drawing ...
    bobs bobs July 2010 New game ideas
  • Z80 RRCA instruction...Hi Folks, Well my exploration of Z80 MCODE continues apace! I am struggling to understand how the RRCA instruction works. The official Zilog manua…

    ... Spin.[/QUOTE]

    SLIA (shift left inverted arithmetic) is a synonym ...
    Matt_B Matt_B August 2010 Sinclair Basic
  • Z80 RRCA instruction...Hi Folks, Well my exploration of Z80 MCODE continues apace! I am struggling to understand how the RRCA instruction works. The official Zilog manua…

    ... routines use "undocumented" instruction SLIA (Shift Left Inverted Arithmetic), sometimes also denoted ... as SLL (Shift Left Logical). SLIA shifts register left and sets the ...
    Winston Winston August 2010 Sinclair Basic
  • SpecOS progressOk, As you can all see, I'm back - and I've been working away on SpecOS for a while now. There's a few videos, which you can see on my blog: [url]h…

    ... :

    SHL, SHR, MID$, LEFT$, RIGHT$, FRAC, CEIL, ROUND, FLOOR ... , POS.

    SHL/SHR shift left and right respectively - faster than ... multiplying by 2.
    MID$, LEFT$, RIGHT$ do as you'd ...
    Dunny Dunny August 2010 Sinclair Miscellaneous
  • 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…

    ... />
    That's a logical shift and won't preserve the ... you can do an arithmetic shift with:

    SRA H ... it's usually better to shift left than right if you've ...
    Matt_B Matt_B September 2010 Sinclair Basic
  • RFC: 64 column font codeIn BASIC, type CLEAR 49999 then import the code at 50000. Then type RANDOMIZE USR 50000. This will create a new channel and attach stream #4 to it. A…

    ... bit 0-2
    rlca ; shift
    rlca ; five
    ... address

    ; left nibble on left hand side

    rrca ; shift right
    rrca ; four ... at destination
    rlca ; shift left
    rlca ; four bits< ...
    chev chev March 2011 Development
<1234567…34>

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
  • Happy 40th Birthday to the Amstrad CPC464!
    rich_chandler on April 21
  • Another Birthday! The Game Boy Is 35!
    mel the bell on April 21
  • European Software Titles with an English version
    harriusherbartio on April 21
  • Elusive Strategy Games done by the Smaller or less Prolific Software Houses.
    harriusherbartio on April 21
  • 1992 Spectrum Software
    harriusherbartio on April 21
  • +3 Disk drive motor
    AndyC on April 21
  • Celebrity deaths...
    mel the bell on April 20

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