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Search Again :: Adv Search 1000 results in 0.016s
<1…891011121314…34>
  • Is this the infamous Dead CockroachCan anyone help me. I have an issue two spectrum that I want to list on ebay, but I want to know if this has the dead cockroach ULA fix. I would have…

    ... made their read or write data bus access collide with the display ... display, but corrupted the IO data transferred. It went unnoticed as ... interrupt routine, when no display data are transferred, but in general ...
    Patrik Rak Patrik Rak March 2011 Hardware
  • DivIDE questionsHi All, I'm the proud owner of two DivIDE interfaces, that I have just "inherited" from a friend. One of them is the original one and the other one …

    ... kempston port decoder) collide with data bus. This is collision between Z80CPU ... with correct decoder (must return data only if Z80CPU read from ...
    c) use my ZX-BUS PROTECTOR (protector connect as first ...
    velesoft velesoft April 2011 Hardware
  • Question about divide +Hi A friend has sent my a faultly divide + to see if I can repair it. If I use this divide+ with a spectrum 48K (That works perfectly with my stand…

    ... through edge connector. As data protection (for possibility connect ... />
    Unstable vector on data bus is not bug of external ... hardware. This is unstable data bus in ZX Spectrum. Fix ... 2) fix vector value on data bus. Always return value #FF for ...
    velesoft velesoft May 2011 Hardware
  • general beginner queriesHi, I bought myself recently a +3 and a devide extension. I was not in touch before with the speccy, but I am really surprised and delighted about th…

    ... that it fix the "floating bus"-issue which can crash some ... + autofire)
    - fix stability of data bus with IM2 vector
    - enable ...
    velesoft velesoft July 2011 Hardware
  • NEW KEMPSTON interface for ZXHi. Lotharek has released a new KEMPSTON interface for people who doesn't need AY on-board and want to have some really small device. [url]http:/…

    ... full 8bit value
    - connect data bus between S-KEMPSTON and ZX ... BUS via smd resistors 100 Ohm< ...
    velesoft velesoft August 2011 Hardware
  • NEW KEMPSTON interface for ZXHi. Lotharek has released a new KEMPSTON interface for people who doesn't need AY on-board and want to have some really small device. [url]http:/…

    ... for coupling the data bus of a peripheral to the data bus of the ... computer? Isn't supposed that the data bus drivers ... for a device that accepts data from the computer, those ... for a device that outputs data to the computer... are they ...
    mcleod_ideafix mcleod_ideafix August 2011 Hardware
  • NEW KEMPSTON interface for ZXHi. Lotharek has released a new KEMPSTON interface for people who doesn't need AY on-board and want to have some really small device. [url]http:/…

    ... for coupling the data bus of a peripheral to the data bus of the ... computer? Isn't supposed that the data bus drivers ... ]

    Resistors on data bus can be used as protection ... can use same ports and data bus collision can be eliminated ...
    velesoft velesoft August 2011 Hardware
  • NEW KEMPSTON interface for ZXHi. Lotharek has released a new KEMPSTON interface for people who doesn't need AY on-board and want to have some really small device. [url]http:/…

    ... full 8bit)

    - connect data bus between S-KEMPSTON and ZX ... BUS via smd resistors 100 Ohm - ...
    lotharek lotharek August 2011 Hardware
  • NEW KEMPSTON interface for ZXHi. Lotharek has released a new KEMPSTON interface for people who doesn't need AY on-board and want to have some really small device. [url]http:/…

    ... full 8bit)

    - connect data bus between S-KEMPSTON and ZX ... BUS via smd resistors 100 Ohm - ...
    velesoft velesoft August 2011 Hardware
  • NEW KEMPSTON interface for ZXHi. Lotharek has released a new KEMPSTON interface for people who doesn't need AY on-board and want to have some really small device. [url]http:/…

    ... I have to use a bus expander (Currah uSlot) to connect ... 't put garbage to the data bus when the device is not ... interrupt and assume that the data bus is always FFh when generating ... ]: the interface can give joystick data at the same time using ...
    mcleod_ideafix mcleod_ideafix August 2011 Hardware
  • Emulation of ZX Spectrum 128+2 (grey)Please read this thread: [url]http://www.worldofspectrum.org/forums/showthread.php?t=35523[/url] result: exist 3 (or more) versions of grey ZX Spect…

    ... 0x7ffd returns the floating bus value, so with some ... IN 7FFD is fast and data bus contain #FF (pull-up ... - if ula read videoram data and CPU use IN 7FFD ... CPU continue in reading but data bus contain #FF (pull-up).< ... port and read floating bus (if ula show border ...
    velesoft velesoft August 2011 Emulators
  • Empire! Help neededCan anyone convert the listing in the Tipshop to Multiface pokes? Im having a hard time with this game, over 15 years playing it, now I could do wit…

    ... incorrectly, presumably because of a data bus discrepancy between the 48k & ...
    Battle Bunny Battle Bunny September 2011 Games
  • Fastest way to mirror a byte?I.E. turning 01100000 into 00000110, in assembly. I'm trying but I suck at stuff with rotation and the carry bit. Any pointers?

    ... the instruction placed on the data bus by the interrupting peripheral and ...
    Alcoholics Anonymous Alcoholics Anonymous October 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…

    ... /> For keys, yes, as the data bus is normally pulled high. But ... for Kempston joystick, the data bits are normally low, so ...
    csmith csmith October 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…

    ... ]For keys, yes, as the data bus is normally pulled high. But ... for Kempston joystick, the data bits are normally low, so ...
    R-Tape R-Tape October 2011 Development
  • Classics ported or cloned on good ol' SpeccyHi, Spectrumists! I'm a fan of classic arcade games and I would like to know from you what do you think about ports or clones of such games on the S…

    ... +3 allram mode - collide on data bus)
    . If you in rom ... ram pages with selectable writeprotect) - data from 16384-32767 can be ...
    velesoft velesoft November 2011 Games
  • Repairing a faulty 48K issue 2.I am investigating one of a pair of non-working issue 2 48K Spectrums that have been sitting in a cupboard untouched for quite a few years. I haven…

    ... memory, "reads" the CPU bus searching for data. If you hold the ... in a reset condition, the data bus freezes and the pattern vanishes ... too to demultiplex the address bus. The latch outputs would be ...
    mcleod_ideafix mcleod_ideafix November 2011 Hardware
  • Repairing a faulty 48K issue 2.I am investigating one of a pair of non-working issue 2 48K Spectrums that have been sitting in a cupboard untouched for quite a few years. I haven…

    ... and these coincide with data on the data bus lines and low going ...
    mcleod_ideafix mcleod_ideafix November 2011 Hardware
  • Faulty rubber speccy - advice neededHello all speccy hardware gurus :) Recently I moved to a new flat and after a long time have some space (and time) to dig out my old Speccy hardware…

    ... chip was connected to the data bus via a resistor R2. I ...
    deckard deckard January 2012 Hardware
  • 4116 SRAM replacement (and ULA timings).As mentioned in another thread, I have spent quite a lot of time experimenting with different circuits and components for using a static RAM IC to re…

    ... the ULA. From my memory, data is latched by the ULA ... an invalid read of the data bus, but by a byte being ...
    Zorn Zorn February 2012 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 other devices ... .

    Some games need data D7-D5 on port #1F ... -D5=part of floating data bus, D4-D0=joystick data)

    Also ...
    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…

    ... work some load on data adress or control bus should be found ... you can place any bit data at pins 2 / 4 / 6 ... working as well as the data bus driver in read direction.
    ingo ingo 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…

    ... ?

    looking at the data bus you should see high and ...
    ingo ingo February 2012 Hardware
  • Occasional noise over RGB on +2AHi all I have a +2A that is misbehaving at the moment. I'm using the RGB to SCART lead (which incedentally is great on my +3) The problem is, the …

    If it's not a TV issue then looking at the way the picture is corrupted I'd be looking for possibly shorts on the data bus to the contended ram chips. (between IC1 and IC3/IC4)
    guesser guesser February 2012 Hardware
  • divIDE x Spectrum clonesAnyone has a Spectrum clone and did a test with divIDE? Here in Brazil we have 2 Spectrum clones (TK90X and TK95) that are almost 95-99% compatible w…

    ... , but problems with adress and data bus on TK90X apears when we ... buffers in the address and data buses. Quality of componentes are ...
    Eduardo Eduardo February 2012 Hardware
  • Maritrini and Cray 5 loading problemsHas anyone else here had issues loading either of these on a 128k? No matter what I try, both these games refuse to load properly. I can get both t…

    ... , EVEN when secaria's floating bus fix is implemented (a resistor ...
    nuggetreggae nuggetreggae March 2012 Games
  • Maritrini and Cray 5 loading problemsHas anyone else here had issues loading either of these on a 128k? No matter what I try, both these games refuse to load properly. I can get both t…

    ... puts rogue bytes on the data bus. They came with 48K+ machines ...
    Jmk Jmk March 2012 Games
  • Issue 3B only sees 16k (and RAMTOP NO GOOD on loading)A ZX+ with issue 3B board that i got recently, does not see anything more than 32768 (sometimes 37267..) on "PRINT PEEK 23732 + PEEK 23733 * 256 (Ent…

    ... RAM exposes their data bus on the rear bus, so they can be ...
    mcleod_ideafix mcleod_ideafix March 2012 Hardware
  • New DivIDEIs this the only place to obtain a new DivIDE? [url]http://www.lotharek.pl/product.php?pid=25[/url] Tried to purchase a device from there, but am g…

    ... /Amiga joystick.
    Data bus is connect with ZX bus via resistors (protection ... port return full 8 bit data value.

    [B]This ...
    velesoft velesoft March 2012 Hardware
<1…891011121314…34>

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