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Search Again :: Adv Search 1000 results in 0.014s
<1…20212223242526…34>
  • BUG in zxspin and SpecEmu - read Loading speed in WAV fileI'm created a new save, but it can run at 44.1 KHz, to test it, i make a new file from WAV 44.1 KHz to 88.2 KHz. Load this file in a emulator zx-spin…

    ... electronics driving the MIC port act as a low pass filter that ...
    Alcoholics Anonymous Alcoholics Anonymous April 2012 Emulators
  • I/O port adress map of Spectrum and interfacesI'm looking for an adress map of all the used and unused I/O ports for the ZX-Spectrum. Many years ago I designed an I/O board for the Spectrum that…

    for doing 16 bit output (either data or address) you ... the low half of the 16 bit bus, and the output of ...
    guesser guesser April 2012 Hardware
  • Improving audio?In working on fixing and updating the hardware in my ZX Spectrum 48k, there is one nagging issue. My issue 2 board has crappy sound through the beepe…

    the way I did it was two npn transistors in darlington coupling, so that low input signal gives a high current output to drive the speaker. I have not replaced the speaker yet, but I am considering it.
    Johan1973 Johan1973 April 2012 Hardware
  • Wanted : Fully working spectrumLooking for a ZX Spectrum +2 or toast rack with all the cables if possible. I have around ?30 to spend on one so games are not really a must as i ca…

    ... which joins the AY output to the beeper output, and then dial ... use RF rather than the MIC socket, you get the sound ...
    Spirantho Spirantho April 2012 Wanted
  • Making a video with in-vision video advice neededI'm after making some Spectrum gameplay videos of people playing the games, so that when played back, a small box in the corner shows the game, or ma…

    ... onboard soundcard + say a USB mic.. then your forced to use ... decent soundcards, the latency is low / good enough.. depends on lots ...
    fog fog April 2012 Chit chat
  • ZX Spectrum ULA core available at OpenCoresHi! On April, 23th, I opened a new project at the OpenCores website: [url]http://opencores.org/project,zx_ula,Overview[/url] Right now, it has a, h…

    ... the speaker, mic, and ear signals into one audio output, allowing the ...
    mcleod_ideafix mcleod_ideafix April 2012 Hardware
  • Modulator oddness - previous owner's mod?Hello, just bought a rubber key 48k Issue 3 I'm trying to fix up. I'm wanting to do a composite video out mod ( n00b at this) but the "spare" hole in…

    ... the problem is that the output on the Galaxy S2 I ... wav files was way too low for it. I can load ...
    beelzebubbles beelzebubbles May 2012 Hardware
  • Intermittent sound cutting outHello, I'm resurrecting an old rubber key spectrum. Originally it had no sound at all, diode D9 was blown, I replaced it with one from my other dead …

    ... , I just run the MIC socket output through the TV if I ...
    beelzebubbles beelzebubbles May 2012 Hardware
  • Question about 2-channel beeper musicI confess I haven't tried all the available beeper utilities and software. I always found music software confusing and trackers are not for me. I kno…

    ... (deliberately) - there's an RC low pass filter in there. You ... (pulse width modulation). Basically the low pass filter will effectively give ... time spent with 1 being output, and shorten the time with ... of the beeper circuit's low pass filter to make analogue ...
    Winston Winston May 2012 Development
  • ISO-Copy - Individual Software revisitedHi folks In another thread about Supertape: [url]http://www.worldofspectrum.org/forums/showthread.php?t=36203[/url] ... we touched on ISO-Copy by th…

    ... two pulses (high and low) are different to the ... pulses polarity (high, then low), markers will be better placed ... . You will get an output as [URL="https://dl ... a mid-size pulse on output, for the sake. ... Now for the timings. CSW output showed the wav file samples ...
    jlsoler jlsoler June 2012 MIA/STP/SDP
  • Ear + Mic bits behaviour in relation to beeper outputHave just read [url=http://www.worldofspectrum.org/forums/showpost.php?p=348953&postcount=38]this old post of Joefish's [/url] in the development for…

    ... voltages generated (MIC=0 and MIC=1) are too low to actually drive ... EAR to 1 and toggling MIC produces a quiet beep (there ... beep by toggling EAR and MIC bits at the same time ...
    Jon Needle Jon Needle June 2012 Emulators
  • Spectrum +3 FavourCan a kind soul with a multimeter and a +3 measure the resistance on the power socket between the 5V and the ground? I have a dead +3 that only has 0…

    ... />
    By experience, a very low voltage on the +5 rail ... the required voltage at its output.

    If you are ...
    mcleod_ideafix mcleod_ideafix June 2012 Hardware
  • Harlequin clone...PCB manufactured!Using Chris Smith's detailed schematics and project notes from the Harlequin... a Speccy fan in the United States by the name of Don (Superfo) has de…

    ... 's. Only keyboard, EAR and MIC connectors are missing. It works ... work is the composite video output. It outputs video, but it ... 'm using it with RGB output at the moment.

    mcleod_ideafix mcleod_ideafix June 2012 Hardware
  • 4116 replaced by 4164 - "Noisy" paper?After I replaced my 4116's with 4164's and hooked them up to +5V, disconnected -5V and +12V, I have what looks like vertical lines in the paper, like…

    ... levels). Basically, if the output impedance of the memory the ... and the output impedance of the CPU is sufficiently low (or ... upper memory's output impedance is ... sufficiently low) data can "bleed ...
    Winston Winston June 2012 Hardware
  • Internal amp and signal cleaner for tape inHello! Is there known to work INTERNAL schematic which cleans signal from tape in and amplifies it. I need such thing so i can load from my smartpho…

    ... will switch 0-1 at low input levels, so, no amp ... output is perfect 5V digital signal.

    However, maybe a low ...
    ArtemKuchin ArtemKuchin July 2012 Hardware
  • Internal amp and signal cleaner for tape inHello! Is there known to work INTERNAL schematic which cleans signal from tape in and amplifies it. I need such thing so i can load from my smartpho…

    ... loading down the smartphone's output too much) or insufficient ... are quite a few low power ones which have ... because they have high output impedance. I also have ... redundant kit which are very low power, but rapidly roll ... DC or very low frequency applications).
    Winston Winston July 2012 Hardware
  • Xor-shift random number generator for Z80[QUOTE=Patrik Rak;320244]Come on, people, [URL="http://www.jstatsoft.org/v08/i14/paper"]xor-shift generators[/URL] devised by Marsaglia, that's the w…

    ... (because equal state implies equal output from now on which means ... prove the opposite. Therefore, the output of the tested generator is ... 2^16, which is so low that it's not even ...
    Patrik Rak Patrik Rak July 2012 Development
  • Building a PlusD - problemsI'm building a PlusD for myself, but I'm having difficulty getting the ROM to page in properly. At this moment the ZX Spectrum boots, but is VERY slo…

    ... ONLY is inverted on the output PIN. So only a logic ... , Spectrums ROMCS is normally low, so a low on the 'zxrom' pin ... . 008, 058,102 (making f17 low will make zxrom go high ... out = OUT 231(making zxrom low will make f17 go high ...
    roko roko July 2012 Hardware
  • Odd / interesting things to do with Spectrums, IF1 and Microdrives.Firstly, I did not know where to put this, whether to shoe horn it into one of the more recent microdrive-ish threads, or drag up one of my old ones.…

    ... , as one output may be trying to output logic low at the same ... other IF1 is trying to output a logic high).
    Winston Winston July 2012 Hardware
  • Spectrum Emulator that supports low resolutions and runs smoothlyHello to All, I have been trying to find a spectrum emulator that will work well through my CRT TV (using RGB to Scart) Most emulators seem to supp…

    ... , or !HBlank is low the output of all three colours ... must be low. In ... !Sync signal drives the output to the [I]blacker ... AOLatch. This point, marked Output Load in [I]fig ...
    When !Border returns low it will again take until ...
    guesser guesser August 2012 Emulators
  • Sending key presses to the spectrumfor a project I want to send automated keyboard presses to the ZX via a micro-controller. Is it possible to send these through the expansion slot? …

    ... one gate). The output of your decoder will ... microcontroller. The microcontroller will output 5 bits that will ... A8-A15 will go low indicating this, the remainder ... impedance condition for that output bit and put a ... put the data bit output into high-impedance again ...
    mcleod_ideafix mcleod_ideafix August 2012 Hardware
  • Messenger interfaceHave anyone photos, schematic, rom images, documentation, or software for Messenger interface ? [url]http://www.worldofspectrum.org/infoseekid.cgi?i…

    ... is true for reading. A low level present at pin 13 ... " by the Messenger, as the output transistor of the CNY17 (optoisolator ...
    mcleod_ideafix mcleod_ideafix August 2012 Hardware
  • Sending key presses to the spectrumfor a project I want to send automated keyboard presses to the ZX via a micro-controller. Is it possible to send these through the expansion slot? …

    ... header (column) will be an output from your microcontroller. Configure these ... of 7-pin header is low THEN
    PULL down bit ...
    mcleod_ideafix mcleod_ideafix August 2012 Hardware
  • Sending key presses to the spectrumfor a project I want to send automated keyboard presses to the ZX via a micro-controller. Is it possible to send these through the expansion slot? …

    ... 8-pin heeader will be low.

    So, put ... 10K pullups). The 3-bit output will be the input to ... one row happen to be low.

    Now you ... read. Other pin (open collector output) can be tied to the ... 2 keyboard, and send a low pulse to that line to ...
    mcleod_ideafix mcleod_ideafix August 2012 Hardware
  • (Re) building a ZX Spectrum laserharpThe Cambridge show is nearing, and I want to bring my laserharp with me. Why? Because it's built around a ZX Spectrum +2: [IMG]http://benophetintern…

    ... to 5 times the light output power to get the same ... to boost the photo diode output, and outputs a voltage between ... built in circuitry, consumes very low power, and is very stable ...
    bverstee bverstee August 2012 Hardware
  • (Re) building a ZX Spectrum laserharpThe Cambridge show is nearing, and I want to bring my laserharp with me. Why? Because it's built around a ZX Spectrum +2: [IMG]http://benophetintern…

    ... not influence the original DAC output signal.

    2. Whenever ... there IS movement, TTL blanking output should be 'high'.
    ... diodes that have a very low voltage drop to maintain most ... best solution, as the rectifier output does not have a common ...
    bverstee bverstee August 2012 Hardware
  • Spectrum 128 toaster and divide incompatibility problems with some demos and games.Okay so I got this thing now. It?s my first Spectrum ever. [img]http://img836.imageshack.us/img836/2016/speccyl.jpg[/img] [url]http://img824.image…

    ... k machine has an /clk output with an amplitude of not ... have a TTL level clock output.

    I found it ... a stable clock with low jitter, and low phase shifting against the ...
    ingo ingo August 2012 Sinclair Miscellaneous
  • Spectrum 128 toaster and divide incompatibility problems with some demos and games.Okay so I got this thing now. It?s my first Spectrum ever. [img]http://img836.imageshack.us/img836/2016/speccyl.jpg[/img] [url]http://img824.image…

    ... k machine has an /clk output with an amplitude of not ... have a TTL level clock output.[/QUOTE]

    The Spanish ... of ~2.2v (typical V low = 0.6v, V high = 2 ...
    Winston Winston August 2012 Sinclair Miscellaneous
  • Harlequin clone...PCB manufactured!Using Chris Smith's detailed schematics and project notes from the Harlequin... a Speccy fan in the United States by the name of Don (Superfo) has de…

    ... the first time the RGB output with the composite video signal ... probably you will note some (low contrast) moir?. I managed to ...
    ingo ingo August 2012 Hardware
<1…20212223242526…34>

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