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  • Floating point representationI'm planning on picking up the [url=http://matt.west.co.tt/category/spectrum/openzxrom/]OpenZXRom[/url] project from where I left off a few months ba…

    ... the Speccy ROM's floating point routines is welcome ... in)...

    Normally, floating point numbers on the Spectrum ... represented in the standard floating-point notation with complete ... is converting integers to floating-point notation immediately on ...
    gasman gasman October 2006 Development
  • The direct bus or indirect one... that is the questionThe Ethernet project continues...and I'm in a quandry. So I've managed to implement enough socket library for the W5100 that socket, bind, listen, a…

    ... most of the address bus to facilitate bus indirect mode. According to ... supports two parallel modes - bus direct mode (where the chip ... or buffers.

    Bus direct mode's advantage is ... do two LDIRs if necessary). Bus direct mode means accessing registers ...
    Winston Winston November 2007 Hardware
  • "Floating" AY registersWhile I was working on some AY sample-related stuff, it occurred to me that with the AY port not being completely decoded, it would be a handy CPU-ti…

    ... written to the data/address bus are ignored, but can be ...
    gasman gasman December 2008 Hardware
  • Data bus at interrupt timeIt is "well known" that some peripherals can put values other than 0xff on the data bus at interrupt time, thus meaning that IM2 is slightly more fid…

    ... than 0xff on the data bus at interrupt time, thus meaning ...
    Philip Kendall Philip Kendall March 2009 Hardware
  • Z80 Expander Bus ControllHello there my fellow forum chummies, I would like to ask a few technical questions, Now I come from an Amiga Hardware based background, and as yo…

    ... /> [list]
    [*]How is this bus regulated?
    say I have ... interfere with the Z80 expansion Bus
    [/list]

    okay ...
    Zetr0 Zetr0 June 2009 Hardware
  • Bubble Bus SoftwareI'm wondering why Infoseek has this down as "Bubblebus Software", when it's "Bubble Bus Software" on cassettes & adverts. Or, to be even more accurat…

    ... Software", when it's "Bubble Bus Software" on cassettes & adverts ... it's either "bubble bus" or "bubble bus software" in titles, and ... />
    The other Bubble Bus MIA, Curse of the Crown ... sale, probably because Bubble Bus ceased trading during that year ...
    Battle Bunny Battle Bunny July 2009 Infoseek database
  • 48K Speccy Repair Log.Some people may know my love for writing up my repairs of arcade PCBs on various forums so thought I would do the same for this little fella. Had th…

    ... 3 years at least floating round the toyroom taunting ... ... the first test was a bus test, this tells the pseudo ... A14 error. With the bus test passing I moved on ... that the databus and address bus were fine, or at ... least the address bus up to the lines required ...
    Womble Womble August 2010 Hardware
  • BASin floating point issue...Hi Folks, I have been very happy with BASin and found it to be an excellent tool. However, in the last few days a strange error has started to occu…

    ... that there has been "Invalid floating point operation". This is not ...
    Paddy Coleman Paddy Coleman September 2010 Emulators
  • BASin floating point issue...Hi Folks, Reposting here as I think I put it in the wrong section before - sorry. I have been very happy with BASin and found it to be an excellent…

    ... that there has been "Invalid floating point operation". This is not ...
    Paddy Coleman Paddy Coleman September 2010 Sinclair Basic
  • Broken keyboard due to broken ULARecalling csmith's thread about dead ULAs, a thread appeared in the Zonadepruebas (Spanish) forum regarding... a dead ULA, but only a partially dead …

    ... there was weakness driving the bus, in other words that ... the ULA puts on the bus wasn't sufficiently strong ... ULA's side of the bus). The buffer connects KB0 ... goes out onto the data bus.

    To make ... me to put the circuit "floating" on top of whatever ...
    Winston Winston October 2010 Hardware
  • DIVIDE PLUS - ZX bus protectorI make new ZX BUS PROTECTOR for use with DIVIDE PLUS interface. This is very small "convertor" for connection to new ZX BUS connector. PCB contain on…

    ... for connection to new ZX BUS connector. PCB contain only ... possible connect to new ZX BUS any interface (interface 1, ... for direct connection to ZX BUS on ZX Spectrum. Can ... .speccy.cz/other/zx-bus-for-divide-plus-fixed ... .speccy.cz/other/zx-bus-for-divide-plus-fixed ...
    velesoft velesoft November 2010 Hardware
  • Hustler (Bubble Bus)According to an article in Pop.Com.Weekly (21.Jun.84, front page) Hustler was re-released in the UK as Minnesota Fats' Pool Challenge (although proba…

    ... are expected soon"). Apparently Bubble Bus licensed HesWare to sell the ... slightly unusual situation, as Bubble Bus were still selling the game ...
    Battle Bunny Battle Bunny April 2011 Infoseek database
  • Expansion bus questionsHi, two questions about expansion bus, sorry if they have been replied before, I tried to find replies but all my keywords lead to tons of threads O…

    ... />
    two questions about expansion bus, sorry if they have been ... /> 1) Is there any zx bus splitter hardware design avaliable? Any ... that plugs into the zx bus, and provides several connectors (same ...
    Uto Uto April 2011 Hardware
  • Floating Point Forth (CP Software)[IMG]http://i269.photobucket.com/albums/jj79/Hairyrecords/scan0011.jpg[/IMG] I don't see Floating Point Forth by CP Software in the archive. But I …

    ... />
    I don't see Floating Point Forth by CP Software ... published by CP Software as Floating Point Forth.
    I noticed ...
    Hairy Hairy December 2011 Infoseek database
  • SAM BUS for SAM COUPEOne PCB for SAM BUS interface for sale (only PCB + RTC 72421A) PCB is old, but unused. Price is 20 EUR + 5 EUR postage Info about SAMBUS: [url]htt…

    One PCB for SAM BUS interface for sale (only PCB + ...
    velesoft velesoft August 2012 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?
    [*]Which data bits are ... ]
    [*]Do they all use bus mice with a 9 pin ... ST, Amiga and BBC Micro bus mice)?
    [*]Do any use ...
    1024MAK 1024MAK March 2013 Hardware
  • SPECTRA - RGB SCART Interface for 48K SpectrumSince the launch of the SPECTRA interface back in June 2012, some discussion of it has appeared in the forums in the past (mainly [URL="http://www.wo…

    ... signals available on the expansion bus. This allows the Spectrum to ... , full width gold plated expansion bus.
    [*] A set of configuration ... (Disney) [8x1 DE mode] | Mass: Floating City (John Harris) [8x1 DE ...
    Fruitcake Fruitcake April 2013 Hardware
  • New ZX BUS PROTECTOR / +3 FIXER BOARDNew version of ZX BUS PROTECTOR: [URL="http://velesoft.speccy.cz/protector.htm"]http://velesoft.speccy.cz/protector.htm[/URL] [IMG]http://velesoft.s…

    New version of ZX BUS PROTECTOR:
    [URL="http://velesoft ... velesoft.speccy.cz/other/zx-bus-protector/IMGP6977-protector-universal-romoe1top ... php?t=31925&highlight=bus+protector"]http://www.worldofspectrum.org ... php?t=31925&highlight=bus+protector[/URL]
    velesoft velesoft August 2013 Hardware
  • Connectors for ZX BUSHere is photos of three different versions of connectors used on ZX interfaces: As you can see, each connector use different shape of contacts. Firs…

    ... /> Thickness of ZX board (system bus connector) is about 1.5 ...
    velesoft velesoft October 2013 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…

    ... is delivered to the data bus. I gather there's some ... data on the address bus connections is floating (unconnected), but when the ... 8 pins of the data bus are connected to +5V or ...
    joefish joefish January 2014 Hardware
  • Address bus contents (i.e. PC) during execution of HALTI'm wondering if anyone can tell me what's placed on the address bus during execution of HALT, beyond the initial M1 cycle. The Z80 user manual state…

    ... 's placed on the address bus during execution of HALT, beyond ...
    zub zub March 2014 Hardware
  • bubble bus[url]http://www.worldofspectrum.org/infoseekid.cgi?id=0011630[/url] was never released, that comes direct from the owner .. "we never put out any ad…

    ... , prior to being called bubble bus , it was known as "the ...
    fog fog June 2014 Infoseek database
  • Issue 3 expansion connector problemI am having problems with an issue 3 Spectrum, that otherwise works fine, but does not recognize either the Interface 1 or DivMMC/Enjoy (which are bo…

    ... that no connector pins are floating expect the unused ones. I ... otherwise works, there are no bus shorts. Anybody have an idea ...
    Tuukka Tuukka September 2014 Hardware
  • Floating Point Package Math48<br>I came across a neat little floating point package for the z80 and I'm adapting it now to work with z88dk and sdcc.&nbsp; There is an interesting…

    ... across a neat little floating point package for the z80 ... fairly small, and keeps the floating point operands in registers.  The ... EXX set is the primary floating point accumulator and the ... this one.  Genmath requires a floating point accumulator in memory and ...
    Alcoholics Anonymous Alcoholics Anonymous May 2015 Development
  • TV Pal, odd and even framesI have been researching, but haven't found any real interesting information on this subject, so far. What I mean is, since TV PAL signal is interl…

    ... to read something from a floating Z80 bus or similar.
    Just ...
    RMartins RMartins August 2015 Development
  • CPU speed controller (SLOMO) + K-MOUSE + JOYSTICK + ZX BUS EXPANSION (3x throught zx bus)Anyone is interested of this hardware ? [img]http://velesoft.speccy.cz/other/km2016lp3d1.jpg[/img] It's horizontal version of K-MOUSE interface(p…

    ... + joystick interface + zx bus expansion (3x throught zx bus) + external reset button ...
    velesoft velesoft April 2016 Hardware
  • TIL: something about floating point numbersHere's something that had me scratching my head for a while until I figured out what was going on. In a BASIC program, floating point numbers are …

    ... />
    In a BASIC program, floating point numbers are stored unsigned ... />
    then the 5-byte floating point representation after the 14 ...
    SkoolKid SkoolKid June 2016 Sinclair Basic
  • Spectrum 48+ 4S - Upper RAM issue, and now a self-created problem!I recently picked up a known-flaky spectrum off eBay, to have a bit of fun fixing it and reliving youth. It was labelled as 'keyboard duff, shows…

    ... to one of the data bus lines. The soldering & sockets ... in the way of info floating around on this version?
    Paulcatchpole Paulcatchpole December 2016 Hardware
  • Numeric arrays: floating point or integer?I've just started programming a game in Sinclair BASIC (see the thread 'UFO Defence Command' in game ideas, although I'm going to call it ZXCOM ;) ).…

    ... the array as integers or floating point numbers? I seem to ...
    Payndz Payndz September 2017 Sinclair Basic
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Latest Posts

  • I am currently watching.....
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    John Elliott on April 21
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    mel the bell on April 21
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