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<1234567…34>
  • Reading Spectrum+ keyboard versus rubber keyI've started trying to learn Spectrum machine code after a 30 year break. I've encountered something that's puzzling me and I'm hoping that someone c…

    ... real + and reading the keyboard using ports 65022 (key row A ... pressed. Instead, the + keyboard (and the 128 that I ... ) returned 191 on both ports. I tried the same ... I started looking at keyboard ports or have I just ... don't respond to the keyboard on the + and ...
    LoonyJetman LoonyJetman July 2016 Hardware
  • problem with symbol shift and caps shift key combinations on multilayer keyboard membranesHello, I know, it is generally know that some ZX Spectrums with multilayer keyboard membranes have problems with some key combinations. Typically …

    ... some ZX Spectrums with multilayer keyboard membranes have problems with some ... kind of problems. I rewrote keyboard reading routine by using part ... here. It displays all 8 keyboard ports in 512 squares (character/attribute ...
    cygnus cygnus January 2019 Assembler
  • "Press any key" detectionWhat would be the simplest way to detect if *any* key is being pressed? No LAST_K trickery, I can't rely on that. It has to be reading the keyboard p…

    ... has to be reading the keyboard ports.

    I have several ...
    na_th_an na_th_an November 2013 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…

    ... br />
    * Reading the keyboard
    ----------------------

    ... read the keyboard is reading the keyboard ports which will ... buzz which immobilises the keyboard, preventing you typing ... noticeably slow down the keyboard response (since computing ...
    na_th_an na_th_an April 2005 Development
  • Platform Game DesignerI've just noticed - with some surprise - that PGD has jumped into the best 100 games list at number 5, albeit with only 5 votes. While this is all v…

    ... such as ROM routines or keyboard ports.
    jonathan jonathan January 2007 Infoseek database
  • KVM switchI have one KVM PS/2 switch which I use when I want to fix a laptop or desktop, but I began to think how useful it would be if I could switch between …

    ... to be powered off the keyboard ports)

    Edit: And if ... with no video, just switching keyboard/mouse.
    Winston Winston November 2008 Hardware
  • Spectrum + keyboard issueMy Spectrum+ seems to have some trouble on Space Key. Sorry for all "seem" in the following text. But it's hard to understand if it's a real steady t…

    ... noise on the i/o keyboard ports?
    dg67 dg67 December 2009 Hardware
  • Howto paint a squared zone of the screen ?You know what guys ? i begin to love this languaje. Cant understand why not put more effort on the 80's to learn it :( because it is really speedy. …

    ... the lines there is the keyboard polling using ROM routines. It ... handler. The handler polls the keyboard ports and generate ASCII code if ...
    Shiru Shiru June 2010 Sinclair Basic
  • emulatorsplease help can we see clearly which emulator emaulates which hardware is there any that has a pc function key for the mulitface nmi button and the +…

    ... 128K+ as the RS232 and keyboard ports are incompatible with +2/+3 ...
    ASM ASM November 2010 Emulators
  • writing an emulator-newbie needs helpHi, this is my first post here. I decided to write a minimalistic emulator of ZX Spectrum-no emulation of advanced peripherals, no emulation of sound…

    [QUOTE=PeterP;544502]Your answers made everything clear, I have one last doubt about half carry/borrow, only in case of 16-bit additions and subtractions. Let's say we add FFF and 1. This time half carry occurs when we have a carry from bit 11 to bit 12. ...
    ccowley ccowley June 2011 Emulators
  • writing an emulator-newbie needs helpHi, this is my first post here. I decided to write a minimalistic emulator of ZX Spectrum-no emulation of advanced peripherals, no emulation of sound…

    ... one horrid assembler implementation of keyboard emulation..

    [code]
    Woody Woody August 2011 Emulators
  • writing an emulator-newbie needs helpHi, this is my first post here. I decided to write a minimalistic emulator of ZX Spectrum-no emulation of advanced peripherals, no emulation of sound…

    ... the appropriate bits of the keyboard ports during your emulation of the ... , reads the state of the keyboard by executing a series of ... of 8 sections of the keyboard and reacting accordingly, so all ... the state of the PC keyboard).

    Where you had ...
    ccowley ccowley August 2011 Emulators
  • 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 …

    ... graphic modes, colour palette, full ports adressation, extended memory, programmable interrupt ... and more features...

    Keyboard membrane use 100% identical connection ... connect to next I/O ports. Keyboard ports, ula ports (border, tape recorder - ...
    velesoft velesoft November 2011 Hardware
  • Games with K-MOUSE supportHere is modified 128kB TAP version of IRON LORD with new mouse driver controll. All parts with cursor are controlled only with K-MOUSE. Any mouse but…

    ... the program reads from KM ports (I've put a trace ... ). It only reads from the keyboard ports.

    What I don ...
    zx81 zx81 May 2013 Games
  • Games with K-MOUSE supportHere is modified 128kB TAP version of IRON LORD with new mouse driver controll. All parts with cursor are controlled only with K-MOUSE. Any mouse but…

    ... the program reads from KM ports (I've put a trace ... ). It only reads from the keyboard ports.

    What I don ... will always work parallel with keyboard controll. If you need only ...
    velesoft velesoft May 2013 Games
  • Why?I'm just wondering why people are here? Why are we working on or using old hardware? Why are some of you putting a lot of effort in upgrading the ha…

    ... still remember the numbers of keyboard ports and memory locations of the ...
    gkmac gkmac December 2013 Sinclair Miscellaneous
  • Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…

    ... tried shorting between the two keyboard connectors with a piece of ... ULA is responsible for the keyboard ports, so a faulty ULA can ...
    1024MAK 1024MAK April 2014 Hardware
  • Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…

    ... tried shorting between the two keyboard connectors with a piece of ... ULA is responsible for the keyboard ports, so a faulty ULA can ...
    Brian Brian April 2014 Hardware
  • Machine Code in 30 minutes - car gameWotcha folks, 30 years on and I'm still struggling with Machine Code. I'm going through the 30-minute tutorial on the Chuntey blog and it's all made…

    ... There is such thing as ports. Spectrum has Z80 processor. ... keyboard, joysticks, tape player, printers etc. It communitates with them through ports ... sometimes you treat Spectrum ports like one byte number ... />
    As for keyboard ports read here:
    [url] ...
    Ralf Ralf August 2014 Development
  • IN and OUT in hardware terms... what are 'ports'?Hi all, I understand PEEK and POKE, but have never managed to get my head around IN and OUT. The books all go on about how they read from and wri…

    ... more comprehensive than say the keyboard ports detailed in the manuals?
    namtip namtip September 2015 Hardware
  • Understanding the Kempston joystick circuitHere is the schematics: http://www.retroisle.com/sinclair/zxspectrum/Technical/Hardware/KempstonJoystickInterface-Schematics.php Ok, the 74LS138N …

    ... circuits that monopolise all eight keyboard ports, even the key rows you ...
    joefish joefish October 2015 Hardware
  • Reading Spectrum+ keyboard versus rubber keyI've started trying to learn Spectrum machine code after a 30 year break. I've encountered something that's puzzling me and I'm hoping that someone c…

    When reading the keyboard, mask off the other bits ... produced +2A/+3 models, the keyboard ports are presented identically to the ...
    balford balford July 2016 Hardware
  • ZX Spectrum, ZX81 and Middle SchoolersToday I gave a talk to 120 US middle school kids (7 grade) about computer science and careers in programming. I also gave them a taste of programmin…

    ... little basic variant, video out, keyboard ports, SD cards and full access ...
    dasteph dasteph December 2016 Sinclair Miscellaneous
  • ZX Spectrum, ZX81 and Middle SchoolersToday I gave a talk to 120 US middle school kids (7 grade) about computer science and careers in programming. I also gave them a taste of programmin…

    ... little basic variant, video out, keyboard ports, SD cards and full access ...
    colonel32 colonel32 December 2016 Sinclair Miscellaneous
  • ZX Spectrum, ZX81 and Middle SchoolersToday I gave a talk to 120 US middle school kids (7 grade) about computer science and careers in programming. I also gave them a taste of programmin…

    ... little basic variant, video out, keyboard ports, SD cards and full access ...
    Paddy Coleman Paddy Coleman December 2016 Sinclair Miscellaneous
  • Easiest way to figure instruction lengthGiven a start address, what is the easiest way to find out instruction length at that address in Z80? I found [url="http://www.z80.info/decoding.htm"…

    ... is always FEh for reading keyboard ports
    Read_Keyboard_0:
    ... is always FEh for reading keyboard ports
    Read_Keyboard_0:
    ... is always FEh for reading keyboard ports
    Read_Keyboard_0:
    ...
    tstih tstih March 2022 Development
  • Decoding of speccy keyboardHello everyone. I face following problem with spectrum keys decoding and need some explanation. I know how to decode a single key press by reading po…

    ... by reading port 0xfe (eventually ports from 0xfefe to 0x7ffe). Im ... players ?
    Deeper explanation of keyboard matrix reading will be really ...
    Fikee Fikee April 2008 Development
  • 2nd Keyboard for 2-player games?Instead of trying to use keys that we don't like or use a joystick for the 2nd player on a 2-player game, could a second keyboard be used? And if so,…

    ... game, could a second keyboard be used? And if ... it?
    The PC keyboard interface is one way ... not affordable. The joystick ports could be helpful if ... /> Could a +2 keyboard by itself be used as ... second keyboard, plug it to one of the Sinclair Joystick ports, ...
    zxbruno zxbruno December 2008 Hardware
  • Keyboard Issues When Setting Border ColourWelcome to the next in my series of inane 'Z80 on the Spectrum' questions! ;) Here's a minimal snippet of code for polling the keyboard until any ke…

    ... of code for polling the keyboard until any key is pressed ... ), aren't input and output ports separate on the Z80?
    RoseCotton RoseCotton December 2009 Development
  • Using even ports for input?I've been looking for unused ports to use with my clashbasher interface. I understand that the spectrum only considers A0 when decoding its input p…

    ... looking for unused ports to use with my ... port for reading the keyboard and loading from tape ... considered a read of the keyboard and EAR socket.
    keyboard is to be read ... ports in this way? It won't conflict with reading the keyboard ...
    Basher Basher January 2014 Hardware
<1234567…34>

Latest Posts

  • European Software Titles with an English version
    harriusherbartio on 12:06PM
  • How Do You Categorize Your Speccy Software and Games?
    harriusherbartio on 11:21AM
  • Fixed Speccy Software. And which games remained unfixed?
    harriusherbartio on 11:01AM
  • I am currently watching.....
    Paradigm Shifter on 12:49AM
  • New video about S-video modification on Issue two 48K Spectrum.
    Renegade on April 21
  • Happy 40th Birthday to the Amstrad CPC464!
    rich_chandler on April 21
  • Another Birthday! The Game Boy Is 35!
    mel the bell on April 21
  • Elusive Strategy Games done by the Smaller or less Prolific Software Houses.
    harriusherbartio on April 21
  • 1992 Spectrum Software
    harriusherbartio on April 21
  • +3 Disk drive motor
    AndyC on April 21

HitBox

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ports 4K 5.5K

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