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<1234567…34>
  • Port 254 emulation problem. Help, please ...Sorry, but my english is not pepfect. I have a problem and need in professional help. I have developed hard-soft emulator of ZX Spectrum 48. The link…

    ... problem is in emulation of port 254 and kommands IN. Is there ... explain me in details emulation port 254 in IN commands?
    Thank ...
    Vasil Vasil June 2011 Emulators
  • MIC - socketQuestion : is the mic-socket buffered? Or: When I make an OUT to port 254 is the signal still there after the command or only during the OUT? w…

    Question :

    is the mic-socket buffered?

    Or: < ... I make an OUT to port 254 is the signal still there ... reset the OUT 254,1 with a OUT 254,0?

    Dr BEEP Dr BEEP March 2007 Hardware
  • Reading EAR input under emulation...Can either Spin or SpecEmu emulate being able to read audio from the EAR socket of the Spectrum? I'd like to be able to hook some audio to the micro…

    ... to read audio from the EAR socket of the Spectrum?
    EAR socket on the emulated machine, using port 254.

    bobs bobs September 2010 Emulators
  • shorted MIC output? ToastrackI have this toastrack with no sound output on the MIC. EAR is fine and I can load games perfectly fine. Also I can output sound with no problem on t…

    ... no sound output on the MIC.
    EAR is fine and I ... on the EAR port.

    I soldered new EAR and MIC ports but ... continuity I found that the MIC is shorted?

    I ...
    gleegum gleegum October 2020 Hardware
  • WANTED: tape replacement for +2?Any tape replacement possible for a +2? My +2 works wonderfully but the incorporated datacorder is simply worn out and won't load ANYTHING. Dirty sig…

    Bit 6 of IN-port FE is the ear input bit. The value ... ) for all of the MIC socket, EAR socket and the internal speaker ... of high output level on port 254:

    ORG 50000
    EAR and MIC connectors, but note that ...
    Dr BEEP Dr BEEP November 2001 Sales
  • No speech in Cobra's Arc? A mystery tale from Spain...I once downloaded CsA - probably from some Spanish retrogaming website - in TAP format. While I usually discard TAP files in favor of TZX ones as soo…

    ... MIC (3?) bit of port 254 to produce the sound instead of the EAR ... . Most emulators only emulate the EAR bit, but R80 (excellent emulator ...
    Metalbrain Metalbrain April 2004 Games
  • Fuller Sound box faulty for the Zx SpectrumBit of a long shot, but anybody got schematics for the fuller sound box, mine works apart from the ear socket, can't load games thr' the supplied ear…

    ... from the Spectrum's EAR/MIC or actually monitors port 254 activity on the ...
    Jimmy Jimmy April 2009 Hardware
  • Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …

    ... -sound. When you OUT on port 254, I know the first three ... 5th bits are for MIC and EAR, and EAR also controls the speaker ... connected anyway, but EAR produces a louder sound than MIC:
    [URL ... that plugging a lead into MIC disabled the speaker? And if ...
    joefish joefish April 2009 Development
  • Brazilian TK90X and TK95SpecEmu provides explicit support for Brazilian TK90X. Other emulators provide indirect support (perhaps the "Spectrum 48K NTSC" option in Fuse?). Al…

    ... remember it was something about port 254. :)[/quote]

    More likely ... fact that the Timexen decouple MIC and EAR, whereas the ULA machines ... . Unless he was using lazy port decoding of course, because on ... the ULA is only on port #xxFE, not on every ...
    chev chev May 2012 Emulators
  • What would be the simplest tape loading routine?I'm searching for some small assembly snippet I can use to load a (headerless or not) block from tape into RAM I can embed in my C games to load furt…

    ... initial read of port '254'
    RRA ... /> - the present EAR state.)
    CP ... OR +08 Signal 'MIC off'.
    OUT ...
    jamorski jamorski October 2013 Development
  • Spectrum +2 and EARI just bought spectrum +2 (with built in cassete player) and I want to connect external mp3 player. I found link: [url="http://www.madhippy.com/8-bi…

    ... +3 has stereo jacket for mic/ear. Is that the same on ...
    zagor zagor October 2004 Sinclair Miscellaneous
  • Graphic equalizer m.c. program neededBack in the 90's I had a full-screen attribute equalizer that was simple, yet very impressive. We used to listen to Vangelis or Jean M Jarre by conne…

    ... the tape recorder to the EAR socket and outputting the sound ... was very sensitive to the EAR input and I really liked ... />
    Keep bit 5 of port 254

    Increment counter and ...
    zxbruno zxbruno November 2007 Development
  • 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 …

    ... reading bit 6 from port 254, which is the EAR bit.

    port 254, and if it was not ...
    Winston Winston October 2010 Hardware
  • My own Home Computer It's true. My company are planning to build a new Home Computer. It will use a Z80 CPU running at 6mhz, 128k Ram and will run all Spectrum and ZX81 …

    ... motor
    D4 - Parallel port strobe (active low)
    ... Dedicated ear and ear/mic, ear having AY output and stereo, ear/mic being ... for tape. Also stereo TV output.
    MIDI port ... . Joyport. Expansion port!
    Software ...
    cyborg cyborg October 2002 Sinclair Miscellaneous
  • COVOX works?My Sprinter "simulates" a COVOX soundcard at port 4Fh, but I don't know how to use it! Can anyone explain to me the process of programming it? (To be…

    ... by sending values to port where COVOX is sitting...< ... 1 to bit 4 at port 254
    wait a little ... 0 to bit 4 at port 254
    wait a little ... is amplitude, info about human ear is handfull too, as ... has linear scale but human ear recognize sound in logaritmic ...
    Fikee Fikee May 2004 Development
  • Setting the borderCan someone tell me best way to set the border to a given colour using machine code. Its there an operating system call or can I load up a memory loc…

    ... colour is to write to port 254. However, the effect will only ... .

    Port 254 also drives the speaker and EAR socket in bits ...
    jonathan jonathan February 2005 Development
  • Setting the borderCan someone tell me best way to set the border to a given colour using machine code. Its there an operating system call or can I load up a memory loc…

    Port 254:
    * Bit 4 - loudspeaker
    * Bit 3 - MIC socket
    * Bits 2 ...
    andrewbroad andrewbroad February 2005 Development
  • New Compo IdeaI've had this idea and would like to know what do you think about it. I think that most of us here know how to code in BASIC. The problem with Specc…

    ... keys are pressed. Each port address covers 5 keys ... 0) or depressed (1). The port addresses are:

    ... ].

    * Port #254
    -----------

    Port #254, used as output (using ... beeper (bit 4), the MIC connection (bit 3) and ...
    na_th_an na_th_an April 2005 Development
  • Speccy + issues?There was a topic somewhere regarding the different issues of the Spectrum keyboard and how it had some subtle effects on programs. Just wondering …

    ... by detecting EAR input - it is on same 8-bit port as ... it expects some values on port 254, and it came not on ...
    piters piters November 2005 Hardware
  • Reading the border colorI am building a snap-button to my ZX-PC Interface. Is there a way to read the bordercolor which is set by an OUT-command. (and please don't tell me …

    ... memory here) to read in port 254 bits (as one controls the ... an IN on port 254, bit 6 is the EAR input and the ...
    gasman gasman April 2007 Hardware
  • Custom SAVE Routine work on emulators?Hi, I'm developing a SAVE routine derived from the one present in ROM 48K, and I'm trying to get it work on several emulators (X128, Spectaculator, …

    ... even better to use the EAR port instead MIC for saving, isn't ...
    worldxxisoft worldxxisoft September 2008 Emulators
  • Help: OUT (port), A[deleted]

    [code]
    port=254 ; port 254 controls speaker
    LD B, ... port
    out2:
    OUT (port),A ; 211,254 ; Send 16 to speaker port ... both access the border/speaker/ear control. IN xxFE uses the ...
    Jonathan Harston Jonathan Harston December 2008 Development
  • New speccy modelThe 48k toastrack ;) [img]http://alistairtesting.no-ip.org/48k-toastrack.jpg[/img]

    ... the mic/ear ports, they're on the side by the rs232 port ... RGB port is in the same place as the 48k's mic/ear ...
    guesser guesser May 2011 Hardware
  • The SAM CoupeDoes anyone own one of these? I remember being jealous of a friend who bought one of these machines which had a disk that made the system compatible …

    ... ports (border, tape recorder - mic/ear) and "attribute" port #FF use same adress ... ZX128 models, only use different port numbers). Some 128kB games can ...
    velesoft velesoft November 2011 Hardware
  • Newbie QuestionsI have just purchased my first Speccy! It should be shipped to me (in the U.S.A.) very soon. I'm a ZX newbie & I have some questions :-D First of al…

    ... 't connect anything to the MIC socket at all.

    MIC & EAR ports are. My assumption ... assumed that the EAR port was an EARPHONE port that I could use ... 3.5 mm jacks for MIC & EAR or are these some ...
    zolli zolli February 2012 Hardware
  • Newbie QuestionsI have just purchased my first Speccy! It should be shipped to me (in the U.S.A.) very soon. I'm a ZX newbie & I have some questions :-D First of al…

    ... understand what each of the MIC & EAR ports are. My assumption ... assumed that the EAR port was an EARPHONE port that I could use ... input to the Speccy) and MIC connected to a microphone socket ... 3.5 mm jacks for MIC & EAR or are these some ...
    AndyC AndyC February 2012 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…

    ... the behaviour of MIC and SPK bits at port 254.

    For ... the electron beam include using port $FF to wait for the ...
    mcleod_ideafix mcleod_ideafix November 2012 Hardware
  • Folks with real speccies - test this!A lad from another forum has written a music demo for the Speccy, but he can only test it on ZXSpin, so needs some helpful chaps to record this to ta…

    ... the WAV directly into the EAR socket rather than writing to ... out of the loudspeaker port to the EAR socket, I suppose ... it ... sockets are called EAR & MIC, as both EAR & MIC(rophone) are input ...
    Battle Bunny Battle Bunny February 2013 Sinclair Miscellaneous
  • Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…

    ... sits in a loop probing port 254 and returns the number of ... :
    and e ; look at EAR port
    cp d ; compare against ...
    stephenw32768 stephenw32768 August 2013 Development
<1234567…34>

Latest Posts

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HitBox

Word Docs Hits
port 10.1K 15.4K
254 953 2.2K
mic 1.6K 2.1K
ear 2.4K 3K

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  • Am After EAR/MIC Cable (Maybe Tape Recorder As Well)Hi<br /> <br /> I am after an ear/mic cable and perhaps a tape recorder if cheap (although i'll probs get it off ebay or something). So if anyone has…
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  • Port 254 emulation problem. Help, please ...Sorry, but my english is not pepfect.<br /> I have a problem and need in professional help.<br /> I have developed hard-soft emulator of ZX Spectrum …
  • Ear + Mic bits behaviour in relation to beeper outputHave just read [url=http://www.worldofspectrum.org/forums/showpost.php?p=348953&amp;postcount=38]this old post of Joefish's<br /> [/url] in the devel…
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