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Search Again :: Adv Search 1000 results in 0.031s
<1234567…34>
  • Broken ZX Spectrum + (48k)Hi! I just got a ZX Spectrum + from a friend. He said it was working around 8 years ago when he put it into the cellar. It was in great condition - …

    ...
    clears the screen with a 1 bit pattern from bottom to top ...
    Tom-Cat Tom-Cat December 2003 Sinclair Miscellaneous
  • Any BBC aware Specchums out there?After the UK101 and VIC20 emulators I've moved my sights onto emulating a BBC computer. This emulator will be different though in that it will be a Z…

    ... the keyboard, writing to the screen, saving to tape, scrolling ... the screen etc. will be in ... can't draw to the screen, save files, make sounds ... can fill with an 8x8 bit pattern? I also need a ... draw a dotted line (of pattern byte 'b') with the ...
    Jimmy Jimmy August 2008 Development
  • Keys redefine routine and key check.I have written some asm code which allows me to redefine keys (for a game etc.), and also allows me to be able to check any keypresses for the redefi…

    ... hl ; point to the key bit pattern
    cp (hl) ; check ... call ROM_CLS ; do the clear screen
    ld hl,msg_define
    ld a,2 ; upper screen
    call CHAN_OPEN ; get ... ld (hl),a ; save the pattern byte
    dec hl ; go ...
    polomint polomint September 2011 Development
  • Difficult to find upper RAM fault.I've recently repaired an issue 3B 48K Spectrum that had a tricky to diagnose upper RAM fault, so I thought I'd post a report of what I found here. …

    ... it produced a mainly black screen with various coloured squares ... was always 34. The bit pattern for 34 is the same ... .

    Given that bit 5 of all upper RAM ... IC20 and this was the bit that was always wrongly ...
    It still seems a bit odd to me that I ...
    Zorn Zorn April 2012 Hardware
  • bit manipulation conundrumWhat's a neat way to change this bit pattern in registers BCDE: [code]Loop0: ;change B:00000000 C:abcdefgh D:ijklmnop E:qrstuvwx[/code] to this bit …

    ... neat way to change this bit pattern in registers BCDE:
    [code ... :qrstuvwx[/code]
    to this bit pattern?
    [code] ; to B:0abc0def ...
    Battle Bunny Battle Bunny November 2013 Development
  • Textured Scanline Flood Fill for ZX Spectrum 48KPity that it's quite hard to contribute code to WoS in a straightforward manner. Recently, I have created a textured/hatched fill M/C routine for the…

    ... [/url] that I pimped a bit to support textures and color ... /> [code]
    1 REM Colored Pattern Fill
    2 REM (C ... Leave some space for shadow screen buffer
    20 GO SUB ... /> 300 REM Location of fill pattern
    310 IF RND> ...
    Volker Volker February 2021 Software
  • Any Errors?Any errors you feel Sinclair Research or even Amstrad made with the speccy??

    The screen is not so much split ... this is so.
    The screen address can be related to ... I like to view the bit pattern of the address - essentially some ...
    cyborg cyborg March 2004 Sinclair Miscellaneous
  • UDG/sprite HelpRestore 5: For N=20 To 21: Read G$: For R=0 To 7: Read B: Poke Usr G$+r,b: Next R: Next N

    ... bytes used to store the bit pattern of UDG A. The +0 ... cannot read them with SCREEN$ from the screen.

    A very ... and read them back with SCREEN$. Not only that, but you ...
    Dr BEEP Dr BEEP March 2004 Sinclair Basic
  • Want a Speccy Repaired?Maybe it's time to put my 'skills' to use.... Now that I've sourced some of the nastier transistors, I've fixed about 6 rubber keyed Speccys in the …

    ... program that writes to screen RAM every bit pattern, and then writes it ... -$7800) and copies it to screen RAM, hence testing write and ... keyboard/tape.
    The clever bit though is that it doesn ...
    Spirantho Spirantho June 2005 Sinclair Miscellaneous
  • udg collision detectionhow do I detect a collision between udgs in basic?

    ... (unless it has the same bit pattern as a character in the ... an empty string from a SCREEN$ call.

    This can ... />
    If you have a screen of mostly empty space, then ... specific UDG is impossible with SCREEN$ - and as Dr Beep says ...
    Dunny Dunny July 2005 Sinclair Basic
  • Want a Speccy Repaired?Maybe it's time to put my 'skills' to use.... Now that I've sourced some of the nastier transistors, I've fixed about 6 rubber keyed Speccys in the …

    ... program that writes to screen RAM every bit pattern, and then writes it ... 7800) and copies it to screen RAM, hence testing write and ... test rom. Spectrum initialized and screen looked just like in emulator ... . How should I read the screen?

    If there ...
    Timppa Timppa September 2005 Sinclair Miscellaneous
  • Starting on machine code - BASIC first?Howdy. If I wanted to start learning machine code for the speccy, from scratch, would you recommend I learn BASIC first or is it entirely possible to…

    ... much easier to spot a bit pattern or type it up ... !) that the number's bit pattern has significance and not just ... in order to understand the bit pattern. "and 248" comes up ... rather than hex for the bit pattern but you'll find ... be displaying anything on screen.
    Alcoholics Anonymous Alcoholics Anonymous November 2007 Development
  • Any BBC aware Specchums out there?After the UK101 and VIC20 emulators I've moved my sights onto emulating a BBC computer. This emulator will be different though in that it will be a Z…

    ... can fill with an 8x8 bit pattern? I also need a ... draw a dotted line (of pattern byte 'b') with the ... />
    I have a pattern filler that uses an 8x8 ... space to do a blank screen (vs the >30k ... on "A Fast Breadth-First Pattern Filler...."

    In ...
    Alcoholics Anonymous Alcoholics Anonymous August 2008 Development
  • Interlace demoSorry to reference another thread like this, but in the thread: [url]http://www.worldofspectrum.org/forums/showthread.php?p=313428#post313428[/url] …

    ... demos which do rapid screen switching like that, and ... the same 'chessboard' pattern... but there are four ... And this is a static screen - no hidden animations - ... a grab of the screen and load it into ... black-ink (reversing the bit pattern where necessary to make ...
    gasman gasman November 2008 Sinclair Miscellaneous
  • Jetpac questionHi all, I just bought a copy of Jetpac off of Ebay and I'm having problems. To start, I'm trying to play it on an issue 2 Speccy with Interface 1, 2 …

    ... up a bit (the code and the screen output) because ... /> LD A,170 ; Load alternating bit pattern

    MEASURE
    ... ; This version - no selectable screen address or font address
    ;
    ; On screen QP_SCREEN (default 16384)
    ; ...
    Digital Prawn Digital Prawn January 2009 Games
  • Keys redefine routine and key check.I have written some asm code which allows me to redefine keys (for a game etc.), and also allows me to be able to check any keypresses for the redefi…

    ... hl ; point to the key bit pattern
    cp (hl) ; check ... call ROM_CLS ; do the clear screen
    ld hl,msg_define
    ld a,2 ; upper screen
    call CHAN_OPEN ; get ... ld (hl),a ; save the pattern byte
    dec hl ; go ...
    polomint polomint September 2011 Development
  • New WIP underway - 'Dingo'.Hi, Prepare for a long post. Perhaps I can even challenge ewgf here. :razz: Anyway, I've been meaning to get into Z80 programming and making a game…

    ... hl ; point to the key bit pattern
    cp (hl) ; check ... call ROM_CLS ; do the clear screen
    ld hl,msg_define
    ld a,2 ; upper screen
    call CHAN_OPEN ; get ... ld (hl),a ; save the pattern byte
    dec hl ; go ...
    polomint polomint October 2011 Development
  • Creating a new game - AssemblySo... finally I?m studying Assembly Z80... after 36 years. :) Well... it?s sooooooooooooo hard to make a game using Assembly? I bought a book (Spectr…

    ... writing a byte to the screen then you might choose binary ... code what the bit pattern that will appear on the screen is.
    ccowley ccowley January 2012 Development
  • Creating a new game - AssemblySo... finally I?m studying Assembly Z80... after 36 years. :) Well... it?s sooooooooooooo hard to make a game using Assembly? I bought a book (Spectr…

    ... writing a byte to the screen then you might choose binary ... code what the bit pattern that will appear on the screen is.
    Turrican Turrican January 2012 Development
  • New Game! Uwol '81 [ZX81][img]http://www.mojontwins.com/wp-content/uploads/2012/03/s1.png[/img] Yup, we have ported our most-ported game to date to the good ol' ZX81! Using …

    ... 's no real bitmap. The screen is text-mapped, as in ... (albeit not every possible 8 bit pattern), but it doesn't allow ...
    na_th_an na_th_an March 2012 Brand new software
  • display file addressing; screen slicingWhile working on this Compendium I'm updating or rewriting a lot of stuff. One thing I eventually came to appreciate was the simple & clever way in w…

    ... & transparent movement around the screen.

    [code]
    ... address
    pop hl ;HL=bit pattern address

    push bc ... br /> add hl,de ;HL=bit pattern save address
    ex de ...
    Battle Bunny Battle Bunny October 2013 Sinclair Basic
  • Converting an integer arbitrary large binary number into a printable decimal formThis was asked a long ago at the comp.sys.sinclair newsgroup. At that time, I came up with a solution by extrapolating the classic algorithm of suces…

    ... ;HL=start of char's bit pattern
    pop de ;DE=display ... /> [/code]
    Fortunately a 2040 bit number converts to a maximum ... fits on one screen.

    The tricky bit which would save ...
    Battle Bunny Battle Bunny December 2013 Development
  • How to print logo onto screen at chosen coordinates?Hi, I've just got back into zx spectrum games after all these years and after seeing some of the great games on here I would like to start learning p…

    ... follow; it addresses the full screen, handles 96 characters, 16 block ... ;HL=start of graphic's bit pattern

    pop de ;DE ...
    Battle Bunny Battle Bunny February 2014 Development
  • What if Sinclair had released a 16 bit Spectrum?Had Sir Clive not wasted his companies money on the white elephant that was the C5 and instead focused on competing with his rival computer manufactu…

    ... 256x192 screen would take 12288 bytes. Then add palettes for each bit pattern ... which improves colour resolution a bit without redesigning the graphics system ...
    carlsson carlsson July 2014 Games
  • 64x48 monochrome big pixels display ideaHi. I was playing with this idea of having a simple 64x48 bytes buffer, 1 byte per pixel, then a renderer which would take that buffer and render it…

    ... /> [*]A DI can save a bit of time.
    [*]The "multiplying ... variables area.
    [*]Constructing the bit pattern could be simplified; eg:[code ... new version had crossed the screen the old version was about ...
    Battle Bunny Battle Bunny December 2014 Development
  • Double height text...<p>Is here any good routines for printing a font double height?</p><p>I've concocted this ridiculous routine but I'm sure it can be done much better.…

    ... c double height
    ;Screen Addressing:
    ; hi = ... hl,bc           ;HL=d$(c) bit pattern address

            ...    a,(hl)          ;get bit pattern from current CHARS set
    bit pattern to display
            inc  ...
    Battle Bunny Battle Bunny June 2015 Development
  • I don't think I'm getting the $22AA Pixel-Add rom routineDear all, I'm misunderstanding how the PIXEL-ADD rom routine works. My code... [code]ld b,175 ld c,1 call $22AA ld (hl),a ret[/code] So…

    ... need to shift your pixel-pattern right by A places to ... combine your new bit pattern with whatever's already on screen; most often ...
    GReW GReW March 2016 Development
  • I don't think I'm getting the $22AA Pixel-Add rom routineDear all, I'm misunderstanding how the PIXEL-ADD rom routine works. My code... [code]ld b,175 ld c,1 call $22AA ld (hl),a ret[/code] So…

    ... can only shift/rotate one bit at a time, we need ... counter of zero reverts the bit pattern to its initial value.
    bit pattern you like. For example if ... it with whatever's on screen already.
    GReW GReW March 2016 Development
  • Must be missing the point - machine code... Hi Folks, Trying my hand at machine code again but falling at the first hurdle. I hand crafted the following to run at address 62000 and the co…

    ... br /> 62000 ; Bit Pattern
    62001 LD ... A ; POKE bit pattern in to screen memory $77< ... screen bytes $24
    62025 LD A,(62000) ; Load A with bit pattern ...
    Paddy Coleman Paddy Coleman September 2016 Development
  • Must be missing the point - machine code... Hi Folks, Trying my hand at machine code again but falling at the first hurdle. I hand crafted the following to run at address 62000 and the co…

    ... br /> 62000 ; Bit Pattern 10101010 or &AA ... A ; POKE bit pattern in to screen memory $77
    screen bytes $24
    62023 LD A,(62000) ; Load A with bit pattern ...
    Paddy Coleman Paddy Coleman September 2016 Development
<1234567…34>

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