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<1234567…34>
  • 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…

    ... due to the way the port 31 is checked in 128K and ...
    zyloj zyloj September 2007 Emulators
  • Proper mapping for joysticks in an existing emulatorThis may seem like a strange question, so I'll try to explain it as well as possible. In one of Rare's (Ultimate Play the Games) later games there…

    ... joystick (or whatever is at port 31) but had no actual keyboard ... the joystick to the keyboard port, and what masks would be ...
    Zoinkity Zoinkity March 2012 Emulators
  • Fully-addressed devices initiative (FADI)I would like to introduce an initiative for those who create new pieces of hardware containing legacy devices with well-known addresses. It says that…

    ... Kempston-compatible joystick interface (using port 31) should detect A0 to A7 ...
    Jiiira Jiiira March 2013 Hardware
  • Data separation on Kempston joystick interfaceIn my last two Kempston Joystick interface batches I included data separation resistors (100 ohm). I was thinking that they were needed so another de…

    ... so another device that uses port 31 can always overrule this Kempston ... all: if another device reads port 31, my Kempston Joystick interface should ...
    bverstee bverstee April 2013 Hardware
  • Please explain how a Kempston interface circuit works.Can someone help me understand how a Kempston joystick interface works, as I want to design and build my own as an experiment. I understand switches…

    ... is trying to read from port 31.

    I appreciate this ...
    joefish joefish January 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…

    ... URL]

    After read port #1F return kempston joystick interface ... br />
    Each reading from port 31 set signal SELECT for joypad ... 1 and each reading from port 95 reset signal SELECT ... software not use port 95 then joypad work on port 31 as standard ...
    velesoft velesoft June 2014 Hardware
  • Games for two KEMPSTON joysticksMy "RTC module for DIVIDE" support connection of small JOYSTICK SPLITTER with two joystick connectors. First joy is kempston on port 31 and second is…

    ... . First joy is kempston on port 31 and second is kempston on ... port 95.

    Here is ...
    velesoft velesoft August 2014 Games
  • Kempston joystick detectionIn both [url="http://skoolkit.ca/disassemblies/manic_miner/asm/34252.html#34332"]Manic Miner[/url] and [url="http://skoolkit.ca/disassemblies/jet_set…

    ... ]
    LD BC,31 ; B=0, C=31 (joystick port)
    DI ; Disable ... 256 readings of the joystick port in A
    OR E ... 5 of a reading from port 31 is reset if a Kempston ... the code deliberately checking ports 31+256[i]n[/i] (0
    SkoolKid SkoolKid October 2014 Hardware
  • Disciple extensionHello to all! Today I successfully repaired a MGT Disciple belonging to a friend of mine, and in the process I had a chance to study a little this r…

    ... to output bit 5 of port $31). Supposedly, these proprietary pins are ...
    Falco-F8L Falco-F8L January 2015 Hardware
  • Turbo RAM Glitch or feature ?I have been testing a Spectrum [url="http://www.worldofspectrum.org/infoseekid.cgi?id=1000328"]worldofspectrum.org/infoseekid.cgi?id=1000328"]RAM Tur…

    ... ) simultaneously a Kempston port on the right port, and optionally a Protek ... (generates cursor keys) on left port.

    After a few ... simple basic program to check port 31 for Kempston.
    I used ...
    RMartins RMartins September 2015 Hardware
  • Kempston interface schematic: wrong IC?Hi! I'm trying to learn about the inner workings of the speccy, and I thought that building a kemspton interface would help me learn about things lik…

    ... , and A5 low as decoding port 31. So a low output from ...
    Mikelone Mikelone March 2017 Hardware
  • is a arduino uno / nano fast enough to talk to a specie ?my current project is to load games onto the specie via SD card / Arduino uno / nano although i suspect that the micro controller will not be able to…

    ... .. but i calculated that a PORT write would take 1.5 ... bytes to the specie using port 31 (kempston) . the best i have ...
    mark8bit mark8bit April 2022 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…

    You were right first time Mat, the Kempston Interface utilised the 5 least significant bits of port 31 - at least that was the address I always used.
    jonathan jonathan October 2002 Sinclair Miscellaneous
  • One Man And His DroidPosted a few days back about control probs with a few games, after a bit of getting used to what to look for controls-wise and all the .txt files und…

    Looks like the game ignores the keyboard if a kempston is attached.

    So you either need an emulator with kempston joystick support or, for keyboard, an emulator that gives floating bus behaviour on port 31.
    Woody Woody April 2004 Games
  • One Man And His DroidPosted a few days back about control probs with a few games, after a bit of getting used to what to look for controls-wise and all the .txt files und…

    ... gives floating bus behaviour on port 31.

    [/quote]

    port 31. It will scare the pants ...
    Arjun Arjun April 2004 Games
  • One Man And His DroidPosted a few days back about control probs with a few games, after a bit of getting used to what to look for controls-wise and all the .txt files und…

    [quote]
    On 2004-04-23 14:52, Arjun wrote:
    :o Er... I'd rather not have any bus floating over port 31. It will scare the pants off the navy I tell you!
    [/quote]

    LOL
    Metalbrain Metalbrain April 2004 Games
  • 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…

    ... ? The standard "IN 31", corresponds to a port address of "????????00011111", but ... important.

    [code]
    Port 31 = 0001 1111
    Kempston = 000x ... respond to an IN from port 15.

    If the ...
    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…

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

    ... can be read in port 31: IN 31 which give you a ... [Chaosmongers].

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

    Port #254, used as ...
    na_th_an na_th_an April 2005 Development
  • 128k, +2, +3ok i`ve asked a lot of questions over the few days but this is gonna be my final one on whats what unless i get lost once i get my apeccy so here goe…

    My port 31 may be unattached. Therefore it doesn't exist? Then how the hell am I gonna plug this new Kempston I/F in and expect it to work? :)
    Woody Woody December 2005 Hardware
  • Extracting the Multiface ROM?Is there an easy way to save the contents of a real Multiface 128 ROM to tape, on a real spectrum, for the purposes of transferring it to PC for emul…

    ... turbo save option uses different port addresses to the MF128 that ... the +D enabled mf128, use port:
    191 to page in ... turbo saves to tape, use port:

    191 to page ... not an MF1? That uses port 31 I think.....
    DEATH DEATH June 2006 Hardware
  • Extracting the Multiface ROM?Is there an easy way to save the contents of a real Multiface 128 ROM to tape, on a real spectrum, for the purposes of transferring it to PC for emul…

    ... ports 159 to page in, 31 to page out. These are ... , IN 159 fo page OUT, port 31 to page IN. Also, the ...
    DEATH DEATH June 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…

    ... on a +3 - anything generic port 31 will be fine. Not sure ... work as a simple IN 31 port but it's your risk ...
    DEATH DEATH October 2006 Hardware
  • Testing RAM Chips After RemovalHi I am going to use Winstons Hot Air Gun method of removing the RAM chips from a 4S circuit board. I wish to check the RAM chips, I have a Logic Pr…

    ... x 74HC138 - for I/O port decoding
    - 2 x 74HC272 ... , and the memory bank with port 31 (bits 0 to 4 select ...
    Winston Winston April 2007 Hardware
  • InterfaceHi I'm building a spectrum emulator. I've tried to build it as modular as possible, for example I have a zx class that have input and output devices…

    General ROM paging is all done in hardware. Take a look at the Spectrum Diags board in my sig below if you want to see it in schematics.

    But in summary, the Spectrum exposes a line called ROMCS at the edge connector. Every memory chip in a ...
    Winston Winston May 2007 Emulators
  • What control methods should I supportAs Bipboi is nearing it's completion, I need to ensure i cater for all control methods required by the users. Currently it just supports: keyboar…

    ... is super-easy. Just read port 31. The meaning of the returned ...
    Alcoholics Anonymous Alcoholics Anonymous May 2007 Development
  • Multiface 128 For Zx Spectrum 48k/128k/+2[url]http://tinyurl.com/2kufr4[/url]

    The MF1 came with a Port 31 joystick interface and an activation switch. Later Multifaces used software switching.
    DEATH DEATH May 2007 Sales
  • 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…

    ... How do you decide what port it is on? I ... has 5 input port bits readable at adress 31 - in Basic ... 31.

    To send bits to an output port you ... 8 bits from one port adress. Schematic is not ... pins.

    For Port 31 (Kempston) a simple schematic is ...
    ingo ingo 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…

    ... this can be read via port 31?

    Would it be ...
    carlinski carlinski 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…

    ... means it only responds to port 31, leaving the other 254 ports ... it responds to the nominal port address 31, yes, but it also ... responds to 127 other port address including port ... 6,..... In this case the port decoding is "incomplete" and ...
    Alcoholics Anonymous Alcoholics Anonymous October 2007 Hardware
  • Group Order of Internal/External Kempston Turbo InterfacesI have contact Velesoft ([url]http://velesoft.speccy.cz/kmturbo-cz.htm[/url]) about the production of internal or external kempston turbo interfaces …

    ... bus. K-MOUSE use too port #1F(31) for Kempston JOYSTICK/Amiga ... mouse. This port is possible disable by ... other ZX interfaces use too port 31)

    MB IDE interface ...
    velesoft velesoft November 2007 Hardware
<1234567…34>

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