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<1…18192021222324…34>
  • ZX80 and 81 hardware questionsI'm finding a lot of the documentation that is ostensibly about the hardware of the ZX80 and 81 to be primarily about the software. I was hoping some…

    ... , the machine inspects the data bus. If bit 6 is set ... spirits the value on the bus away and forces a 0 ... the value on the address bus is latched. Also bit 6 ... />
    M1 + IOREQ active (ie, interrupt acknowledge) triggers horizontal sync, with ...
    Thommy Thommy September 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
  • The need of having a 257-byte table for IM2 routinesThis came from a discussion at the speccy.org forum. I have understood that the reason behind the 257-table for IM 2 routines is due to certain joys…

    ... on the data bus, messing around with the interrupt routine address calculation ...
    mcleod_ideafix mcleod_ideafix August 2012 Development
  • 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
  • Microcontrollers and the SpectrumBeing unusually busy lately, I didn?t get a chance to comment at the time on a remark in an older thread, but I shall take the liberty of doing it no…

    ... directly connect to the Spectrum bus, and you'll need some ... some other system?s data bus.
    So there is no ... hardware timers and a complex interrupt logic, but it can also ...
    Dan Antohi Dan Antohi January 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?
    [*]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
  • Hardware description - BETA DISK interfaceExist more versions and clones of BETA DISK interface. Beta disk 48, beta disk 128, brasilian clones of beta disk 48, russian clones of beta disk 128…

    ... /> BETA128 contain throught ZX bus for possibility connect next external ... not connect to throught bus devices with own external memory ... devices connected to throught bus. If TR-DOS rom ... data request
    bit 7 = interrupt request
    [/CODE]
    < ...
    velesoft velesoft August 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
  • New version Emulator ZEsarUX-1.0Hi I have uploaded a new version of my Spectrum/ZX80/ZX81 emulator. This is a major stable version, with real timing for all the models and with hi-…

    ... in border, colour ula delay, interrupt starts at video display (not ... ZX80/81
    Added idle bus port emulation
    Added option ...
    chernandezba chernandezba May 2014 Emulators
  • 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
  • Ensure my interrupt handler begins at the same T-stateHi! Is there a way to ensure that an IM 2 interrupt handler starts always at the same T-state (related to the moment the ULA triggers the INT line, w…

    ... ensure that an IM 2 interrupt handler starts always at the ... ,20,21 and 22, each interrupt, and then 19,20,21 ...
    mcleod_ideafix mcleod_ideafix November 2014 Development
  • 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
  • Odd joystick interface / startup behaviourI was experimenting with setting up a machine to run [i]Bomb Munchies[/i] at the weekend and was surprised by a particular condition that caused my +…

    ... put different data onto the bus? And is there anything like ... , or OUT commands or odd interrupt states that may trigger a ...
    joefish joefish August 2015 Hardware
  • 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
  • Interrupt routineI have been trying to create an interrupt routine for playing AY music in the background but cant seem to get anything working. I have a music rou…

    ... been trying to create an interrupt routine for playing AY music ... /> Does the bank switching mean interrupt routines cant be used?
    daveysludge daveysludge November 2016 Development
  • 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
  • GZX 2020.1 ReleasedHi, I just released [url="https://github.com/jxsvoboda/gzx/releases/download/v2020.1/gzx-2020.1.zip"]GZX 2020.1[/url]. [youtube]3AOQETbfrPA[/yo…

    ... interrupt is locked (fixes hang in Tirnanog menu)
    [*]Partial idle bus ...
    Chip Chip March 2020 Emulators
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