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  • Fire Ruby - More HelpI cant pass the spikes in the fire ruby by lawrence creighton, can someone please help? [ This Message was edited by: welsh_brawler on 2003-08-08 21…

    ... and pluck a{6}floating tumbler from the water. ... DESC

    IN BUS AT 15
    CARRIED 18 ... DESC

    IN BUS PRESENT 31
    NOTCARR 18 ...
    BadBeard BadBeard August 2003 Games
  • One Man And His DroidPosted a few days back about control probs with a few games, after a bit of getting used to what to look for controls-wise and all the .txt files und…

    [quote]
    On 2004-04-23 14:52, Arjun wrote:
    :o Er... I'd rather not have any bus floating over port 31. It will scare the pants off the navy I tell you!
    [/quote]

    LOL
    Metalbrain Metalbrain April 2004 Games
  • InterruptsCan someone help with providing some info or a link about IM 2. I know I need to create a vector table and want to store this as high in memory as po…

    ... z80 reads whatever is floating on the bus at the time, usually ... $ff was always on the bus when the z80 was looking ... , R reg) on the address bus and this fools the ula ...
    Alcoholics Anonymous Alcoholics Anonymous February 2005 Development
  • InterfaceHi I'm building a spectrum emulator. I've tried to build it as modular as possible, for example I have a zx class that have input and output devices…

    ... often referred to as either "floating" or "tristated").

    On ... puts an address on the bus. This logic looks at the ...
    Winston Winston May 2007 Emulators
  • Look what I got!Look what I just got in the post: [url]http://www.alioth.net/tmp/W5100.jpg[/url] But, please... don't hold your breath :-) Coming to an edge connec…

    ... /> Various schemes that have been floating through my head include: make ... memory mapped mode versus indirect bus mode doesn't really affect ...
    Winston Winston October 2007 Hardware
  • Look what I got!Look what I just got in the post: [url]http://www.alioth.net/tmp/W5100.jpg[/url] But, please... don't hold your breath :-) Coming to an edge connec…

    ... /> Various schemes that have been floating through my head include: make ... memory mapped mode versus indirect bus mode doesn't really affect ...
    LaesQ LaesQ October 2007 Hardware
  • Benchmark timeWell, the BASIC benchmark posted in Creative Computing back in the 80s came up as a topic on the AtariAge forums. The article is available online an…

    ... say there are about 4000 floating point operations performed if ... instructions per operation. A floating point multiply with 24 mantissa ... each micro uses to represent floating point numbers; the actual ... may also suffer from some bus contention caused by video ...
    JamesD JamesD December 2007 Sinclair Basic
  • Benchmark timeWell, the BASIC benchmark posted in Creative Computing back in the 80s came up as a topic on the AtariAge forums. The article is available online an…

    ... Atari Basic which implements its floating point code in BCD. ... simply stating each machine's floating point representation in a table ... compared to the thousands of floating point operations inside the ... may also suffer from some bus contention caused by video ...
    Alcoholics Anonymous Alcoholics Anonymous December 2007 Sinclair Basic
  • 48K games that don't work on a +2Not sure if there is already a thread about this but recently I've noticed some old 48K games will not run on my +2 - even in 48K mode. Examples are…

    ... 255 is used the bus is left floating and will pick up ...
    Jimmy Jimmy June 2008 Games
  • My annoying computer threadAs i have just purchased my first computer i thought id start a thread where i can ask you all anoying and possibly simple questions. first off ive …

    ... of dodgy capacitors that were floating around the world at the ... being caused by an obsolete bus, or obsolete processor socket, or ...
    The Starglider The Starglider August 2009 Chit chat
  • 128 port hardware patchReading the ULA book has reminded me of something. In The Spectrum Hardware Manual (Adrian Dickens) there is a hardware patch to allow free use of al…

    ... when the Z80's address bus goes into high-Z state ... gate isn't just left floating.
    Winston Winston September 2010 Hardware
  • 128 port hardware patchReading the ULA book has reminded me of something. In The Spectrum Hardware Manual (Adrian Dickens) there is a hardware patch to allow free use of al…

    ... when the Z80's address bus goes into high-Z state ... gate isn't just left floating.[/QUOTE]
    So, something like ...
    Jonathan Harston Jonathan Harston September 2010 Hardware
  • Opinion on new 128K only gamesHello, Being new to the WOS community, I am unclear on the attitude towards 128K only software, that is; Is there a strong need to support the 48K m…

    ... and won't disturb your floating data bus state.
    mcleod_ideafix mcleod_ideafix October 2010 New game ideas
  • Whole upper memory lostHi! I own a rubber key Spectrum with 48K RAM. Suddenly it lost it's whole upper memory. All diagnostic programs says that it's 16K model with workin…

    ... , so data pins are left "floating" and the value of a ... floating data bit is '1' in ... faulty memory chip are not floating, then, with time, the faulty ... a '1' into the data bus while your working memory chip ... , so its data pins keep floating.
    mcleod_ideafix mcleod_ideafix October 2010 Hardware
  • Which kempston joystick schematic is the best?I'm looking for the best Kempston Joystick interface schematic. It has to be as cheap as possible. But it must be as compatible as possible. I've c…

    ... better use resistors on data bus (elimination of data collision with ... (then D7-D5=part of floating data bus, D4-D0=joystick data ...
    velesoft velesoft February 2012 Hardware
  • MB02 picsI got an original MB02 from someone to fix, and of course I made some pics to share (click for magnification): [URL="http://benophetinternet.nl/hobb…

    ... the data bus you should see high and low and floating level ... time but the contacts had floating resistances...

    Ingo ...
    ingo ingo February 2012 Hardware
  • Very weird +2 problem.After two days, I'm still fighting this grey +2. Symptoms: When I first got it, there were stray pixels on the screen, and stray lines and colours. …

    ... may not be the data bus or the Z80 I/O ... the bank switching are sometimes floating due to a poor (dry ... , maybe it is the data bus pins here you need to ...
    1024MAK 1024MAK August 2012 Hardware
  • Brazilian TK90X and TK95SpecEmu provides explicit support for Brazilian TK90X. Other emulators provide indirect support (perhaps the "Spectrum 48K NTSC" option in Fuse?). Al…

    ... TK90X model 2" and "TK95": "floating" bit, usually value "1" (due ... "residual sign" on data bus when accessing the video memory ... [LIST]
    [*]"TK90X model 1": "floating" bit, usually value "1";
    bus when accessing the video memory ...
    Einar Saukas Einar Saukas November 2012 Emulators
  • WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…

    ... separated inputs, form the address bus contents.

    Then, ... high. Then the address bus content fetching is initiated while ... that time, the address bus contents are not available. The ... That's the advantage. No floating wires, except those for the ...
    mcleod_ideafix mcleod_ideafix March 2013 Hardware
  • WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…

    ... separated inputs, form the address bus contents.[/QUOTE]

    bus (or part of it) ... that time, the address bus contents are not available. ... complete 16 bit address bus to the ULA, and ... [/B]sive number of floating wires crossing here and ...
    Mr X Mr X March 2013 Hardware
  • Mouse systems for ZX Spectrum[U][B]Mouse systems for ZX Spectrum[/B][/U] Okay, I have been reading the [URL="http://www.worldofspectrum.org/forums/showthread.php?p=688449#post68…

    ... know level, or are some floating?[/QUOTE]
    Original old ... -D7 is here unused = floating.
    Modern ZX clones ... and D5-D7 are unused/floating - see design of ... ][*]Do they all use bus mice with a 9 ... ST, Amiga and BBC Micro bus mice)?[/QUOTE]
    Russian ...
    velesoft velesoft March 2013 Hardware
  • Some thoughs about fast scrolling on 128 modelPlease, consider this article as technically interesting concept not a proven algorithm. ONE The fastest scrollers use long sequence of PUSH inst…

    [QUOTE=Hikaru;707726]With an added emphasis ... affect the state of the bus during the interrupts is allowed ...
    introspec introspec June 2013 Development
  • East CoastHow are our east coast members holding up with the floods an that.

    ... for a lift, said the bus wasnt going to lyth (she ... was abit flooded, menus etc floating about in weatherspoons lol
    mel the bell mel the bell December 2013 Chit chat
  • Please explain how a Kempston interface circuit works.Can someone help me understand how a Kempston joystick interface works, as I want to design and build my own as an experiment. I understand switches…

    ... data on the address bus connections is floating (unconnected), but when ... ” itself electrically from the data bus.
    [/LIST]
    ... to drive the data bus and the joystick interface ... from the bus), neither low or high, but “floating”, hence described ...
    1024MAK 1024MAK January 2014 Hardware
  • Please explain how a Kempston interface circuit works.Can someone help me understand how a Kempston joystick interface works, as I want to design and build my own as an experiment. I understand switches…

    ... on the chip inputs floating to a high level ... is delivered to the data bus. I gather there's ... data on the address bus connections is floating (unconnected), but when ... 8 pins of the data bus are connected to +5V ... diodes to "control" data bus bits D5, D6 and D7 ...
    1024MAK 1024MAK January 2014 Hardware
  • Video fault on issue two ZX boardI've trawled the Internet and drawn a few blanks as to where to look to resolve the fault with my issue two board. I'm hoping a few of you knowledgea…

    ... outputs derived from floating inputs onto the address bus.

    Otherwise ...
    balford balford September 2014 Hardware
  • Video fault on issue two ZX boardI've trawled the Internet and drawn a few blanks as to where to look to resolve the fault with my issue two board. I'm hoping a few of you knowledgea…

    ... outputs derived from floating inputs onto the address bus.[/QUOTE]:o:confused ...
    1024MAK 1024MAK September 2014 Hardware
  • Video fault on issue two ZX boardI've trawled the Internet and drawn a few blanks as to where to look to resolve the fault with my issue two board. I'm hoping a few of you knowledgea…

    ... /> Now if those inputs are floating, then all sorts of fun ... are forced onto the address bus if the /IORQ input floats ...
    balford balford September 2014 Hardware
  • Video fault on issue two ZX boardI've trawled the Internet and drawn a few blanks as to where to look to resolve the fault with my issue two board. I'm hoping a few of you knowledgea…

    ... /> Now if those inputs are floating, then all sorts of fun ... are forced onto the address bus if the /IORQ input floats ...
    1024MAK 1024MAK September 2014 Hardware
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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
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    mel the bell on April 20

HitBox

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