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<1…11121314151617…34>
  • Emulation vs SpecApologies if this is an old thread, what does anyone think is the best - playing spectrum games through emulation or on a real speccy? I feel it's b…

    ... give the same kind of output as using a real Speccy ... tried it before but the low resolution of a TV makes ...
    Klepto Klepto August 2007 Games
  • Interface extension cable ?I'm wondering if I can make an extension cable for the Speccy's expansion port. It's not the part of making it I'm uncertain about, but wether the l…

    ... rail to rail and have low output impedances - I stuck a 5 ...
    Winston Winston August 2007 Hardware
  • IC Suppliers(of ICs other than those in the big box...) Do any of the people into hardware assembly here know of any suppliers of obscure yet in-production ICs …

    ... able to handle PAL's low 15khz frequency. Most flat panels ... the Speccy's composite video output, how would I go about ...
    DEATH DEATH August 2007 Hardware
  • Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…

    ... later after ULA pulls INTREQ low. I don't think this ... after the ULA pulled it low. But not 3. Besides, if ... ][I]Note that the display output is [B]delayed[/B] until ...
    Patrik Rak Patrik Rak September 2007 Emulators
  • Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…

    ... later after ULA pulls INTREQ low. I don't think ... after the ULA pulled it low. But not 3. Besides, ... before the first pixel is output.

    I ... get 14336 as this "pixel output" value.

    ... contented T-state before pixel output.

    Which ...
    csmith csmith September 2007 Emulators
  • Trying to create NMI, whats this switch?Hi, I have been reading a book Z80 Applications, and I am trying to create a simple device for creating a NMI. Here is a schematic: [url]http://www…

    ... are two inputs, and one output. When the upper input ... brought to logic 0, the output goes to logic 1. ... to logic 0, the output goes to logic 0. ... warm if your resistor is low enough in resistance.
    ... to an input, the output remains the same until logic ...
    Phu Phu October 2007 Hardware
  • Input/Output on Edge ConnectorI would like to sense a pulse on the data bus via the edge connector, i.e. on or off. How do you decide what port it is on? I would also like to send…

    ... happens when the data is output on the port.
    ... , IORQ goes from high to low.

    This ... replaced the LEDs with an output header, you could generate ... high, IORQ is low and WR is low (so it's ... (and the 74HC138 turns its output back high again).
    ...
    Winston Winston October 2007 Hardware
  • Input/Output on Edge ConnectorI would like to sense a pulse on the data bus via the edge connector, i.e. on or off. How do you decide what port it is on? I would also like to send…

    ... on A7-A0, /IORQ low and /RD low and then it can ... A7-A0, forcing /IORQ low and /RD low. The Kempston hardware looks ... port address), /IORQ is low, /RD is low and if this is ... usually means enabling a tristatable output buffer like a standard '244 ...
    Alcoholics Anonymous Alcoholics Anonymous October 2007 Hardware
  • Who has an Issue 1 or Issue 2 Spectrum??Do you have an Issue 1 or 2 Spectrum (ie machines with 5C102E and 5C112E ULA's) ??? You're help is needed! PLEASE SEE THIS THREAD: [url]http://www.…

    ... through and the ULA RAS output must be going high impedance ... ~INT the ULA RAS go low?

    Edit: Oh, make ...
    csmith csmith November 2007 Sinclair Miscellaneous
  • 128 I/O portsIn The Spectrum Hardware Manual there is a small circuit on page 71/72 to allow 128 I/O ports by using IORQ+A7 to override IORQGE, so any I/O access …

    ... somewhere that normally keeps IORQGE low).

    If that is ... IORQGE. Any time A7 is low, the MOSFET will be turned ... the 74LS chip's output was holding IORQGE low, it could end ... transistor if A0 also was low, since the transistor would be ...
    Winston Winston November 2007 Hardware
  • Faulty +2 Grey :(Hello everyone... i was trying to fix a +2 grey board the other day, i had it for some time now. It gave a black screen (paper and border) with two …

    ... ]B[/B]) and a single output ([B]C[/B]). The circuit ...
    Marcelo Marcelo November 2007 Hardware
  • The direct bus or indirect one... that is the questionThe Ethernet project continues...and I'm in a quandry. So I've managed to implement enough socket library for the W5100 that socket, bind, listen, a…

    ... , A0, A1 when CS is low
    - delaying the leading edge ... by the time /CS goes low)

    The actual timing ... T-state. The W5100 briefly output the correct byte than skipped ...
    Winston Winston December 2007 Hardware
  • Speccy plus composite modHi folks, I have 2 48K speccy plus machines both with really poor RF output, one is very weak and the other wanders and white tears across the scree…

    ... an emitter resistor, and the output taken from the junction of ... follower. This is because the output at the emitter simply follows ... high impedance output, but you really need a low impedance output, you can ... you get a more powerful output signal (I.e. a lower ...
    Winston Winston December 2007 Hardware
  • It's a trap!So I got a CPLD (not the eventual one I want to use for the ethernet project - rather, one I actually have here and now, an XC9536 in a PLCC44). And…

    ... flop when MREQ+RD transition low to high. (M1 is ... time RD+MREQ do a low to high transition, if ... to Vcc, and the output from the previous flip flop ... M1 cycle latches the output of the instruction decoder ... cycle). This means the output from the decoder stays valid ...
    Winston Winston December 2007 Hardware
  • .TZX to TapeHy, I&#180;ve been trying to transfer some games that I have in .TZX format to a real tape. I downloaded Taper, opened the game file, connected the …

    ... to be connected to the MIC connection of my tape deck ... and connect only on left output. If you use one ... mono jack the right output goes to GND and ... the same left or right output. The 1M resistor is only ... to connect to one MIC socket! For Hi-Fi recorder ...
    Gods Gods December 2007 Hardware
  • A serious question (in case you think it's facetious)Alright, so none of us can tell the future, and equally no one knows for definate what oil/gas etc reserves are left and where, but I was talking to …

    ... up 5% of our CO2 output anyhow, and would not make ... very bad scenario - all the "low hanging" energy fruit (i.e ...
    Winston Winston January 2008 Chit chat
  • DRAM (:baffled:)Hi, Can someone explain to me the definitive rules on DRAM access times in terms of suitability for a particular speed of processor? Specifically, …

    ... on a chip go from low to high simultaneously with fast ... , and if many outputs go low to high at the same ... 48K Spectrum only has one output, and in any case, each ...
    Winston Winston January 2008 Hardware
  • DRAM (:baffled:)Hi, Can someone explain to me the definitive rules on DRAM access times in terms of suitability for a particular speed of processor? Specifically, …

    ... speccy ULA, which likes to output switched signals. To connect this ... , and it should work. Use low ESR capacitors, and get them ...
    Winston Winston January 2008 Hardware
  • Original Kempston interface on a +3Hello everyone, if i insert an original kempston interface in the extension port of a +3 should it work or not? I tried it and the machine didn't bo…

    ... /> It looks like the sound output is very loud, even when ... the volume setting is low on the tv, the sound ...
    gtsamour gtsamour February 2008 Hardware
  • DivIDE+ and 128K HeatsinkI got my DivIDE+ yesterday and i tried it on a 48K+ at first, it worked marvelously on it, no problems at all. Today i desided to try it on my 128 H…

    ... is a bit on the low side, and the drive of ... when outputting logic 1, the output of the simple resistor/transistor ... the drains (which form the output). The P channel device's ... input, symmetrical drive for the output of both logic 0 and ...
    Winston Winston February 2008 Hardware
  • New ZXDS releaseHello, new ZXDS version is ready and will appear on [URL="http://zxds.raxoft.cz"]the site[/URL] in few hours time, so make sure you check back befor…

    ... are too loud that the output may get eventually clamped by ... discrete sampling of the AY output at 32kHz. Not sure I ... things it's certainly a low priority.

    Patrik
    Patrik Rak Patrik Rak March 2008 Emulators
  • Recording music from Spectrum 128Does anyone have any tips for recording music or improving sound quality from a real Spectrum 128 +2? I tried the obvious method of running a jack t…

    ... , back to the OP, the output is mono so it will ... PC is it set to MIC or LINE IN the signals ...
    dekh dekh March 2008 Sinclair Miscellaneous
  • Recording music from Spectrum 128Does anyone have any tips for recording music or improving sound quality from a real Spectrum 128 +2? I tried the obvious method of running a jack t…

    Forget sound from TV or MIC. You should make ABC or ACB stereo modification. In fact adding only four resistors to AY chip and a stereo jack output socket. Sound output is in dolby ;-) stereo and very clean.
    omega omega March 2008 Sinclair Miscellaneous
  • Your help needed![FONT=Arial]there are [URL="http://www.worldofspectrum.org/neededscreens.html"]a number of titles[/URL] (146) that still lack an in-game scre…

    ... be used by plugging the mic/ear ports into a radio ... program code, but contains only low level routines etc... I believe ...
    Digital Prawn Digital Prawn March 2008 Games
  • Beeper octave range...A dumb question, I know, but I've found two conflicting sources of information on the octave range of the Sinclair beeper. I suppose I'm being a lit…

    ... , divide by 12, go as low as you can go, divide ... beeper does effectively place a low pass filter with 3db frequency ... dc-coupled which will attenuate low frequencies. I'm sure the ... cpu there is much greater output range than '80s sound-generating ...
    Alcoholics Anonymous Alcoholics Anonymous April 2008 Sinclair Miscellaneous
  • Speccy LaptopHi, Since my subtle announcement in another thread was underwhelmingly too subtle, I'll repost it in a new thread ;) I have started work designing…

    ... it later.
    -Ear and Mic sockets
    Check. (A must ... , that lends itself to FPGA output rather nicely.

    [QUOTE ...
    Phu Phu April 2008 Hardware
  • Spectrum Analog interfaceHello Spectrum addicts, Feels good to join you :) I'm trying to build an analog joystick interface for our beloved machine. I've set up a page here:…

    ... D1 and sinked by the output of the first inverter.
    output goes low the rest of the ...
    IN31 IN31 April 2008 Hardware
  • Spectrum Analog interfaceHello Spectrum addicts, Feels good to join you :) I'm trying to build an analog joystick interface for our beloved machine. I've set up a page here:…

    ... use, has an active low output, and active low enable, decodes all 8 ...
    Winston Winston April 2008 Hardware
  • Spectrum Analog interfaceHello Spectrum addicts, Feels good to join you :) I'm trying to build an analog joystick interface for our beloved machine. I've set up a page here:…

    ... the other inverters if one output goes low the rest of the ... and RD and IORQ are low, then the potential at the ...
    mariusster mariusster April 2008 Hardware
<1…11121314151617…34>

Latest Posts

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