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<1…21222324252627…34>
  • 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…

    ... doing clamp diodes in an output signal?) and simplified my EAR ... circuit but I swap between MIC and EAR circuit. I didn ...
    superfo superfo August 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…

    ... probems in the past with low signal level while loading tape ... , or tape recorders with weak output. In original spectrum 48 ULA ... ground layout around the video output and to add one electrolytic ...
    ingo ingo August 2012 Hardware
  • 40 Column Printing RoutineI've written a 40 column printing routine, which I'd like to share... It's my first piece of 'public' code so go easy on me! I don't think it is a…

    ... ld (hl), c ; low byte of the output routine
    inc hl ... b ; high byte of the output routine
    inc hl ; ... br /> ld (hl), c ; low byte of the input routine ... ld c, a ; set the low byte of the offset
    ld (hl), e ; the low byte of the offset
    chev chev August 2012 Development
  • 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…

    ... FPGA: at cycle 0, the output is low. At cycle 1, the ... output is Z. End of the ... state machine. The Z output is because the Z80 has ... cpu_reset (
    input vrclk,
    output cpu_reset
    );

    register ...
    mcleod_ideafix mcleod_ideafix August 2012 Hardware
  • 128k +2 (grey) Ear mod - New ULA and still problemsBverstee kindly sold me a 128K ula since the one in my +2 seemed to have a broken ear in. But even with the new ULA, I still can not load games throu…

    ... after I noted the quite low value of R3,R4.[/QUOTE ... is biased create a constant low current over R1 and R2 ... sources VCC to create an output pulse that is relative to ...
    Johan1973 Johan1973 August 2012 Hardware
  • Replaced Z80 now a very dark screen!Today I dag out an old issue 3 that ive known for a long time has a faulty Z80 (M1 line) so I heat gunned it out, socketed it and replaced it with a …

    ... from the radiant infra-red output of the gun which might ... component to over-temp. The low setting on the gun is ...
    Winston Winston September 2012 Hardware
  • My +2 Guinea PigA grey +2 I bought to perform my experiments on, it's had it's ROM replaced with a 27C256 with Open SE Basic onboard, combined with the Gosh Wonderfu…

    ...
    mcp.pinMode(8, OUTPUT); // Output #0 on the 5pin header ... input
    pinMode(13, OUTPUT); // use the p13 LED ... 8 pin header to go low
    } while (x ...
    mcp.digitalWrite(8, LOW);
    mcp.digitalWrite(8, ... 5 pin header low
    }[/CODE]
    napoleonblownaparte napoleonblownaparte September 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…

    ... . fast) transitions from high to low and viceversa. I think it ... : I've added a second output to the circuit of test ...
    mcleod_ideafix mcleod_ideafix September 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…

    ... sync signals to make its output run in time with where ... shadow screen buffer into the output DVI buffer exactly in sync ... scanned to create the DVI output and is separate to the ... out, DivIDE, Spectranet, ear and mic, kempston sinclair 1 and 2 ...
    BiNMaN BiNMaN September 2012 Hardware
  • PLEASE HELP!! DEAD SPECTRUM!!Sad News!!! I have a spectrum issue 5 board and I'd done the general composite mod which was great and it worked with a divIDE plus (RWAP) and esxDO…

    ... work out the output impedance, it's very low (unless you have ... cable, having a 50 ohm output impedance isn't important - and ... actually give a 50 ohm output impedance if you do the ...
    Winston Winston September 2012 Hardware
  • semi dead speccy 48k who can helpHi forum , i am busy recovering a 48 k speccy issue 3 board unit. With the help of a more experienced spectrum user from the uk , i managed to get…

    ... the EPROM enable its output if (A15 low, A14 low, /MREQ active and ...
    RetroTechie RetroTechie October 2012 Hardware
  • Tape loading from PCSo, I found that I had been using the wrong audio jack socket on my 48k for tape loading (my spectrum is in a third party case, so there are not labe…

    ... too. Listen to the soundcard output with headphones on most PCs ... />
    The problem is the low level only. There a two ... an active speaker with headphone output.

    Greets Ingo ...
    ingo ingo October 2012 Hardware
  • Tape loading from PCSo, I found that I had been using the wrong audio jack socket on my 48k for tape loading (my spectrum is in a third party case, so there are not labe…

    ... ;657305]The problem is the low level only.[/QUOTE]

    output a signal with an amplitude ... by a Spectrum. The audio output from laptop computers is often ...
    Zorn Zorn October 2012 Hardware
  • Tape loading from PCSo, I found that I had been using the wrong audio jack socket on my 48k for tape loading (my spectrum is in a third party case, so there are not labe…

    ... ]Line out would be too low a signal[/QUOTE]

    output then :D

    You ...
    guesser guesser October 2012 Hardware
  • Tape loading from PCSo, I found that I had been using the wrong audio jack socket on my 48k for tape loading (my spectrum is in a third party case, so there are not labe…

    ... or it may damage the output amplifier on the soundcard. Just ... does seem to be fairly low.
    [/QUOTE]

    I ...
    XorA XorA October 2012 Hardware
  • Revisiting Spectrum CPU clock regenerationWarning: This post will be a bit nerdy :-) Some time ago, I experimented with phase locked loop circuits as a possible way to regenerate the Spectru…

    ... from the voltage levels. The output stage 32 contacts ULA constructed ... ;659498]The /CLK is held low during the contention periods (it ... connector is held at a low level during the contention period ...
    Black_Cat Black_Cat October 2012 Hardware
  • Help A Dim Man With UbuntuHeeeeeeelllllppppppp!!!!!!!!!!! I have XBMCbuntu installed on my media PC which normally works great. I logged out of XBMC into the desktop and th…

    ... that the system was very low on memory so uninstalled ZSNES ... ] do you meen low on memory or low on disk space?
    output of fdisk (fdisk -l /dev ...
    ub880d ub880d October 2012 Chit chat
  • Tape loading for realHi, Having failed to load anything from my laptop or phone into my 48k, I have sourced a data recorder. An acorn ALF03. When I received the item I …

    ... speaker", and the ear and mic functions).

    Note that ... the ear and mic connections. The ear output is just a slightly ... has a relatively high power output.

    If you use ...
    1024MAK 1024MAK October 2012 Hardware
  • Help A Dim Man With UbuntuHeeeeeeelllllppppppp!!!!!!!!!!! I have XBMCbuntu installed on my media PC which normally works great. I logged out of XBMC into the desktop and th…

    ... have "fdisk -l /dev/sd..." output.

    Btw. you're ... ) issues here? :???: (since you mention "low on memory" in your 1st ...
    RetroTechie RetroTechie October 2012 Chit chat
  • More schematic errorsWhile working on an article for the faq wiki I've located another error on my +2A/+3 schematics which I've now put right, but I have a problem. I ha…

    ... side is straight onto the output of another gate which will ... can only assume someone was low on caffeine when they were ...
    guesser guesser November 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…

    ... ones needed for RGB output, and composite output.

    Sound works ... can mimic the behaviour of MIC and SPK bits at port ...
    mcleod_ideafix mcleod_ideafix November 2012 Hardware
  • i dont know how to use a spectrum!uhhh sorry to elbow in to your lovely fan site, but i'm from usa (living in uk) and selling a spectrum on ebay on behalf of an english friend. I jus…

    ... convenient but many have too low output volume. Often a line out ...
    RetroTechie RetroTechie November 2012 Sinclair Basic
  • Is the 128K heatsink's TV out modulator kit repairable?I have a 128K+ Spectrum that is working absolutely fine and is giving out the perfect picture from its RGB out socket (with the right cable ofcourse)…

    ... pick it up from the MIC jack....[/QUOTE]
    That hasn ... /> Either connect to the composite output pin on the RGB socket ...
    guesser guesser November 2012 Hardware
  • Suggested Spectrum model for retro hobbyist?I'm planning on getting myself a Spectrum of some sorts to add one of the most famous 8-bit computers to my retro collection (already have C64, A1200…

    ... the Ear and Mic jacks).
    The audio output from the KempAY ... internal speaker (plus Ear & Mic jacks).

    If you ...
    1024MAK 1024MAK November 2012 Hardware
  • Suggested Spectrum model for retro hobbyist?I'm planning on getting myself a Spectrum of some sorts to add one of the most famous 8-bit computers to my retro collection (already have C64, A1200…

    ... the Ear and Mic jacks).
    The audio output from the KempAY ... internal speaker (plus Ear & Mic jacks).

    If you ...
    emuola emuola November 2012 Hardware
  • Ay Real Time Synthetizer SoftwareSpectlemen and Spectladies!It's been a long time that I'd like to ask this.... I ask thee to create a new musical software for our ZX Spectrum machi…

    ... bits. Then two of the output lines go to keypad, two ... low 4 bits of input and the high 4 bits of output ... ]
    I've tested midi output from my +3, you simply ...
    guesser guesser November 2012 Development
  • Code execution logging/profilingAs revealed in [url="http://www.worldofspectrum.org/forums/showthread.php?t=41666"]this thread[/url], I'm adding support for reading code execution l…

    ... option. To get the 8K output you want you also need ... full 64K) and -z (limit output to Z80 code only, so ... are a bit on the low side, at 3-5K each ... [/url] are my input and output files for all 3 games.
    obo obo December 2012 Emulators
  • Another cause for DivIDE problems on 48K'sThe last months some topics were opened to discuss problems with 48K ZX Spectrums and DivIDE. Sofar we found: - Bad Z80's because of poor fanout (si…

    ... . You will see that the output for the BJT option seems ... ROMCS high enough, and sometimes, low pulses from ULA make its ... instead of voltage at the output), the BJT seems to react ... later, and sometimes a tiny low pulse "escapes" from the pullup ...
    mcleod_ideafix mcleod_ideafix December 2012 Hardware
  • Another cause for DivIDE problems on 48K'sThe last months some topics were opened to discuss problems with 48K ZX Spectrums and DivIDE. Sofar we found: - Bad Z80's because of poor fanout (si…

    ... . You will see that the output for the BJT option seems ... ROMCS high enough, and sometimes, low pulses from ULA make its ... instead of voltage at the output), the BJT seems to react ... later, and sometimes a tiny low pulse "escapes" from the pullup ...
    bverstee bverstee December 2012 Hardware
  • How far are we from a single-chip 100% ZX Spectrum compatible solution?I really like to read about the projects of some geniusses here on WoS who are working on their ZX Spectrum clones. IMHO some main steps that have b…

    ... analog parts, to manage video output (unless you manage put a ... /HDMI output in the chip).
    - You would still need MIC/EAR ...
    Zup Zup December 2012 Hardware
<1…21222324252627…34>

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HitBox

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mic 1.6K 2.1K
output 9K 13.1K
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