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<1234567…34>
  • Tricks with IN 31It's generally considered unwise to use a Kempston joystick's fire button to start a game, because the floating bus effect can make arbitrary data ap…

    ... considered unwise to use a Kempston joystick's fire button to ... on IN 31 from the screen RAM.

    If the Kempston interface ... is disconnected, and I read IN 31 while the ... is connected, and I read IN 31, can I be sure that ...
    ajmoss ajmoss April 2010 Hardware
  • DK-Tronics Joystick Interface, notes for databaseOn this page: [url]http://www.worldofspectrum.org/infoseekid.cgi?id=1000120[/url] There is a note marked 'Blurb': "The first port simulates 6,7,8,9 …

    ... keys. The second port simulates IN(31) command" - Kempston.

    And a ... /> The left port implements the Kempston ( IN (31) ) protocol. The right port implements ...
    joefish joefish February 2013 Infoseek database
  • Plea for new hardwareI'm posting this as a poll as I want to judge if I'm a solo loon going on about this, or if people really are interested in either of the following S…

    ... \ 76543210 /

    --------------------------------------------------------------------------------
    #1F/31 xxxxxxxx00011111 xxxxxxxx xxxxxxx1 Kjoy(7 ... As for all the others in that list, they WILL ... A5 low when reading Kempston IN-31.
    joefish joefish April 2014 Hardware
  • +2A/Kempston interface incompatibility?Hello forum,<br><br>So, I used to be active here about eighteen months ago.&nbsp; I liked messing about with turboloaders.&nbsp; Then I disappeared b…

    ... programmable types). Though in those flat genuine Kempston-made interfaces the pins ... over the shorter connector. The Kempston IN 31 protocol only uses an 8 ... -bit IN address so that shouldn't ...
    joefish joefish May 2015 Hardware
  • Dual joystick interface schematic?Hi! Would anyone have a schematic for a dual joystick interface? Cursor or sinclair would either work. If not, I might try my hand at designing one.…

    ... .

    Official Kempston joystick interfaces decode the IN-31 by checking for ... ) and can be distinct from Kempston IN-31. This port is selected so ... cheap clone of the Kempston interface, because in both cases the 6th ...
    joefish joefish May 2018 Hardware
  • Dual joystick interface schematic?Hi! Would anyone have a schematic for a dual joystick interface? Cursor or sinclair would either work. If not, I might try my hand at designing one.…

    ... cheap clone of the Kempston interface, because in both cases the 6th ... 's K-55 (IN-55) interface and normal Kempston IN-31 interface.
    ... works and reads both IN-95 and IN-31 at the same ... a Joefish K-55 (IN-55) modified Kempston interface and can confirm ...
    MatGubbins MatGubbins July 2018 Hardware
  • Kempston on real machines and on emulatorsRecently I've tested several 48K games on my Spectrum +2A with Kempston interface. The computer resets when I start the game. I've tried with two dif…

    ... on my Spectrum +2A with Kempston interface. The computer resets ... ve tried with two different kempston interfaces, with the same results ... the way the port 31 is checked in 128K and 48K models ... changed the way they coded kempston in games after the release of ...
    zyloj zyloj September 2007 Emulators
  • Kempston joystick in Spin & FuseI was wondering what the trick was to getting Kempston joystick emulation to work in Spin (v0.666) & Fuse (vJan'09). I've searched the Emulator forum…

    ... was to getting Kempston joystick emulation to work in Spin (v0.666 ... get random movement. In Fuse, selecting 48k + Kempston in both Peripherals and Joysticks ... got no response from the Kempston option in Spin or Fuse, apart ...
    Battle Bunny Battle Bunny June 2010 Emulators
  • +2A/Kempston interface incompatibility?Hello forum,<br><br>So, I used to be active here about eighteen months ago.&nbsp; I liked messing about with turboloaders.&nbsp; Then I disappeared b…

    ... Cheetah Mach 1 and this Kempston interface: http://www.retrogames.co ... /028282/Sinclair/Kempston-Joystick-Interface

    Nada.  PRINT IN 31 just returns ... incompatibilities with any models of Kempston interface and the +2A?
    stephenw32768 stephenw32768 May 2015 Hardware
  • Chuckie Egg and joypads on the SpectrumAn old favourite of mine is "Chuckie Egg", but it has no joystick option. I've got a dual port DK Troniks interface, the first port takes IN 31(Kemps…

    ... interface, the first port takes IN 31(Kempston) and the second uses the ... 9. What is the point in that? Does anyone know how ...
    Spector Spector March 2002 Games
  • OUT to file, IN from fileOUT - sentences won't do much on emulators since they mostly communicate with external devices. If there was an emulator that would write the (last) …

    ... and read the (last) IN-ed value, then someone could ... was OUT-ed and in another WINDOW-program you ... 31.IN and the emulator would read the value with LET A=IN 31 ... .

    In this way your ... hardware.

    In my case I could test ...
    Dr BEEP Dr BEEP August 2002 Emulators
  • 2 questions regarding partial port decoding1) What happens if the Spectrum reads from a port whose number matches the criteria for more than one device ? Does only one of the devices get to r…

    ... a troublesome command would be IN/OUT from port 0000h, as ... criteria for triggering the Kempston joystick ? The standard "IN 31", corresponds to a ... requirements ?

    Shouldn't IN A,(15h) also access the ...
    GOC GOC August 2004 Development
  • SPIN's breakpoints - an overviewAs quite a few people have been asking how to set breakpoints on memory write etc. in SPIN, here's a description of the way the breakpoints work. Get…

    ... , like the Kempston joystick interface, accessed via IN 31. The most ... common way of reading this in machine ... code is the "IN A, (31)" instruction but ... result is 31, and therefore, breaks when the Kempston joystick is ...
    Marko Marko November 2007 Development
  • Detecting a Kempton joystick...I've been playing with the idea in the games I'm currently developing so that once the Kempston joystick has been selected you can hold FIRE down to …

    ... in the games I'm currently developing so that once the Kempston ... testing the results of IN 31 when a Kempston joystick isn't connected ... upshot is that you select Kempston, and the game pretty-much ... starts straight away if a Kempston interface isn't attached.
    bobs bobs January 2008 Development
  • Joystick Interfaces on +2AJust found out that my DK'Tronics joystick interface doesn't want to play with my +2A (black). The Kempston port works OK, but not the Sinclair port…

    ... with my +2A (black). The Kempston port works OK, but not ... /> I swapped the address lines in the interface to make it ... one in the other one I opened).

    Also, a Kempston ... keys, but still registers on IN 31 no problem.

    Anyone ...
    joefish joefish April 2013 Hardware
  • What would you do with four joysticks?Anyone got some inspiring ideas for four-player games, or twin-stick two-player games..? I can think of, for four players: [I]Warlords[/I] (Atari) […

    ... doing 4 joysticks. Sinclair+Sinclair+Kempston+Fuller is the only official ... can think of, but cheap Kempston and Sinclair interfaces are easily ... .g. IN 63 instead of IN 31, and IN 0xEFEF instead of IN 0xEFFE.
    joefish joefish October 2013 New game ideas
  • Quick fix for four joysticksHere's a quick modification to add four joysticks to any Speccy. This assumes you already have two Sinclair ports. [URL="http://joefish.co.uk/specc…

    ... is an old DK'Tronics Kempston-compatible interface. As you can ... 't clash with another simple Kempston interface).

    I've ... of Ben Versteeg's new Kempston interfaces. You can now read ... ]10 PRINT AT 0,0;"IN 31 = ";IN 31;" "
    20 PRINT AT 2 ...
    joefish joefish October 2013 Hardware
  • Plea for new hardwareI'm posting this as a poll as I want to judge if I'm a solo loon going on about this, or if people really are interested in either of the following S…

    ... if people really are interested in either of the following Speccy ... />
    [B]1. A plug-in graphics card[/B], like [I ... joystick interface[/B] that supports IN-31 and IN-55, for adding an ... adapting a few old RAM Kempston-compatible joystick interfaces to K ...
    joefish joefish April 2014 Hardware
  • SEGA GENESIS joypad from Ebay[IMG]http://velesoft.speccy.cz/zx/joypad/IMGP9641.JPG[/IMG] On Ebay is possible buy very cheap chinesse joypad compatible with Sega Genesis / Sega M…

    ... /> IN 31 = 0,0,button C,button B,up,down,left,right (kempston ... compatible data)
    IN 95 = 0,0 ... /> IN 31 = 0,0,button C,button B,up,down,left,right (kempston ... compatible data)
    IN 95 = 0,0 ...
    velesoft velesoft June 2014 Hardware
  • Odd joystick interface / startup behaviourI was experimenting with setting up a machine to run [i]Bomb Munchies[/i] at the weekend and was surprised by a particular condition that caused my +…

    ... one of Ben's new Kempston interfaces and one of my ... hacked Kempston K-55 ones to decode IN-55 (00xx0xxx ... sure only decodes xx0xxxxx for IN-31. On startup, the +2A starts ... , nor tried either the old Kempston with a newer one, nor ...
    joefish joefish August 2015 Hardware
  • Noob's guide to joysticksWhy on earth would I be asking this *now*, I hear you all scream? The answer... curiosity. Back in the day all I ever had was a +2 and Sinclair's …

    ... Only in my twenties did I find out how the Kempston joystick ... interface worked - with the IN 31 function. As ... br /> LET x=x+(IN 31=*value1*)-(IN 31=*value2*) where *value1* and ... IN 127 function much as a Kempston would be with IN 31 ...
    The Mighty Dopethrone The Mighty Dopethrone November 2016 Hardware
  • What is a Kempston joystick?Just a quick question from an ignorant Commodore user (what, a Commodore user on this sacred ground? Relax, I'm a fan of all 8-bits, including the wo…

    I thought that reading the Kempston joystick was via IN 31... oh well, maybe I should re-read my Speccy mags again.
    MatGubbins MatGubbins September 2002 Sinclair Miscellaneous
  • Kempston Interface To Work On 128K +2a ( HELP )Hi need some Advise I'am trying to play games on a 128K +2a Using a (Kempston Interface +3) but it will not work (WHY) , do you need to setup or so…

    Plug your Kempston interface into +3, switch the computer on, and type:
    10 print at 0,0;in 31;" ":go to 10
    and Run it.
    If you move stick or press fire, the values on screen should change. If it does so the interface works well.
    LCD LCD February 2003 Sinclair Miscellaneous
  • 2 questions regarding partial port decoding1) What happens if the Spectrum reads from a port whose number matches the criteria for more than one device ? Does only one of the devices get to r…

    ... vary with different Spectrum clones (in particular, the Timex machines ... for triggering the Kempston joystick ? The standard "IN 31", corresponds to a ... ?

    Shouldn't IN A,(15h) also access the ... have a look at the Kempston interface schematic here at ...
    Alcoholics Anonymous Alcoholics Anonymous August 2004 Development
  • 2 questions regarding partial port decoding1) What happens if the Spectrum reads from a port whose number matches the criteria for more than one device ? Does only one of the devices get to r…

    ... for triggering the Kempston joystick ? The standard "IN 31", corresponds to a ... br />
    Shouldn't IN A,(15h) also access the ... /> [code]
    Port 31 = 0001 1111
    Kempston = 000x xxxx
    ... schematic is accurate, the Kempston joystick will not put ...
    Alcoholics Anonymous Alcoholics Anonymous August 2004 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…

    ... /> 1) Reading the joystick (Kempston for instance) in BASIC routines?
    < ... ) Pokes to get cool stripes in Borders.

    3) ... kempston joystick from BASIC is very easy. You just read "IN 31 ... IS compiler, (and sometimes in BASIC) you can get some ...
    chaosmongers chaosmongers April 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…

    ... can be read with IN 61438 and IN 63486, respectively.
    ... ).
    * Kempston Joystick can be read in port 31: IN 31 which give you ...
    On other machines: search in VARS for start of BASIC ... printed out is contained in ROM starting at address ...
    na_th_an na_th_an April 2005 Development
  • Lesser used BASIC commandsAre there any interesting articles or books that explore some of the lesser used BASIC commands/functions e.g. DEF FN, IN, OUT etc? The Spectrum BAS…

    IN 31 is for reading the Kempston joystick too.
    Paul van der Laan Paul van der Laan January 2006 Sinclair Basic
  • Kempston mouse inverted axels?Hi I have a problem with my Kempston mouse :???: X and Y axels are inverted (and I'm using mouse right way!), ie. if I move mouse left, cursor moves…

    ... have a problem with my Kempston mouse :???:
    X and Y ... /> 10 print at 10,10; IN 31;" "
    20 goto 10
    Kempston Y-axis the wrong way ... to play it with a Kempston joystick attached). Sorry I can ...
    ewgf ewgf April 2006 Hardware
  • +3 Joystick interfaceI have just purchased a +3, never had one and I wanted to here the 128K music on my games. I know the built in JS ports are wired differently, so do…

    ... you can use a "standard" Kempston type interface on a +3 ... - anything generic port 31 will be fine. Not sure ... have the ROM carts plugged in tho - IF2 and the RAM ... may work as a simple IN 31 port but it's your ...
    DEATH DEATH October 2006 Hardware
<1234567…34>

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