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<1…15161718192021…34>
  • The best ZX Spectrum emulatorsIt's been suggested we add a sticky thread where people can recommend their favourite emulators. A couple of rules. 1. Don't just nomina…

    ... , although I suppose I can understand this misconception. You [i]can[/i] set ... You can set breakpoints on port I/O (“br p re 0xc002:0x4000 ... ”, to catch I/O access that would cause a ... pretty much it, and I expect [i]some[/i] emulators have debuggers ...
    zub zub October 2015 Emulators
  • Interface 1 - RS232 question.I am thinking about doing some Spectrum stuff based around the RS232 port used on the Interface 1. Has anyone had any joy doing this with an emulator…

    ... machines instead, with the serial port pins coming off the sound ... the I/O lines are reversed in the Aux port, so I presume that ...
    joefish joefish November 2015 Development
  • Interface 1 - RS232 question.I am thinking about doing some Spectrum stuff based around the RS232 port used on the Interface 1. Has anyone had any joy doing this with an emulator…

    ... And the I/O lines are reversed in the Aux port, so I presume ... ports over as the serial port goes:
    [code]
    ... /> [/code]
    whereas the keypad port goes:
    [code]
    ground ... were splicing two bits together (i.e. old lightgun cables)
    guesser guesser November 2015 Development
  • A doubt about IN and OUTIN (and OUT) can use bc to define a 16 bit port to be read or write, when used as in r,(c) or out (c),r. Also, if you use in a,(n) or out (n),a yo…

    ... /> For the other I/O instructions that use C as port number (including ... 16 bits I/O address or still an 8 bits I/O address with ... another 8 bits that [i]can[/i] be ... upper address lines in some I/O operations. Afaik most Z80-based ...
    RetroTechie RetroTechie January 2016 Development
  • JOYSTICKS... All buttons are 'fire'WHY ??? When consoles arrived in full force - there were at least two buttons - one for jump, one for fire... yet no matter how many buttons an old …

    ... joysticks/pads in either joystick port, although it wasn't officially ... needed to use the mouse I/O routines to check the fire ...
    GReW GReW January 2016 Hardware
  • Bizarre ZX Spectrum faults (also possibly relevant to Spectranet compatibility problems).I'm attempting to repair an issue 4A 48K ZX Spectrum and am encountering some very strange problems. For my own records I've given this computer the …

    I was wondering if you have tested that all address lines are intact. Add-ons/expansions that use I/O ports could cause problems with the ULA keyboard port if an address line has a high resistance fault.

    [b][i]Mark[/i][/b]
    1024MAK 1024MAK February 2016 Hardware
  • Kempston joystick - port MSB value?In a situation where let's say the kempston is being polled like this: LD BC,NN1F: IN A,(C), what is the 'correct' value of NN? 1. 00 2. FF 3. S…

    ... in ZX can slowdown some I/O ports with A15=0 + A14 ... =0. Best way is reading port xx1F after interrupt because in ...
    velesoft velesoft February 2016 Development
  • Where can I get some AY music asm/binary files?Is there an online repository for these types of file that people can download and use on their projects? Seen something similar for MSX (Z80 base…

    ... for MSX (Z80 based AY I think), will those .asm files ... . The MSX uses two different I/O ports to access the AY ... .

    The MSX uses port $7C for Register Select and ... the upper byte of the port address, while the Spectrum does ...
    GReW GReW March 2016 Development
  • Reading sequential key pressesI am thinking about writing a quick game and have an idea that requires me to read alternate key presses. I’m thinking along the lines of Daley Thomp…

    ... in fact checking "y","u","i","o" and "p".

    On ... 42 DEC, since each keyboard port only has a half row ... , since you start at zero, I believe that is what you ...
    RMartins RMartins July 2016 Development
  • IBM made Sinclair computers, surely not?Unsure if this has been discussed before so apologies for being thick but a curious line from this book, page 73, states that from 1983 Sinclair prod…

    ... , solid steel case, all the I/O done by discrete logic rather ... requirements: BASIC in ROM, cassette port, beeper sound, and (with a ...
    John Elliott John Elliott December 2016 Sinclair Miscellaneous
  • The ideal USB "emulation" joystick. I used to be happy using emulation with a Dual Shock 3 Playstation joystick . It works and has loads of control buttons that can be configured with…

    ... ://www.techiehq.net/threads/game-port-pci-i-o-card-without-sound-adaptor ... /"]https://techiehq.net/threads/game-port-pci-i-o-card-without-sound-adaptor ...
    harriusherbartio harriusherbartio February 2017 Hardware
  • Purchasing Advice for an ignorant AmericanHello, I am a retro computer enthusiast who lives in the United States. I am currently looking into importing a model from the UK, and would like whi…

    I think eBay can answer many ... .

    3 - The joystick port adaptors are cheap enough; usually ... - We have this word 'b[i]o[/i]ll[i]o[/i]cks' in Britain. Not ... a problem with a hard 'o' sound rather than an 'owe ...
    joefish joefish February 2017 Sinclair Miscellaneous
  • Correction of +2 hardware errorsThis is a collection of various pieces of information picked up from various places, including a lot from this forum. I have edited it and reworded i…

    ... ( or PAL10H8 ). This is port decoder and memory controller.
    port 7FFD (write floating bus data)
    - access to I/O ports ... reading from port 7FFD is also good, but make fast I/O ports ... of fixed chip with original I/O space contention:
    [url] ...
    Renegade Renegade April 2017 Hardware
  • ZX Spectrum Next Kickstarter Launchedhttps://www.kickstarter.com/projects/1835143999/zx-spectrum-next

    ... via the existing FFFD port. This is easy to ... from the 128 compatibility. I am hoping they adopted ... />
    Some things I never heard mentioned but should ... br />
    I'll be adding stream i/o to the z88dk ... the z80 side via port or memory mapped io. ...
    Alcoholics Anonymous Alcoholics Anonymous April 2017 Sinclair Miscellaneous
  • Double Buffering Artefacts on Real HardwareI have a project that I've played around with for a while and always tested using emulators, either ZX Spin or Spectaculator. It is a 128k game th…

    ... bus is 0, if I remember correctly. I think that HALT can ... contended port for Kempston.[/quote]

    Interesting. Can you elaborate? I ... mean something else by contended port?

    Also, there's ... IIRC they don't have I/O contention.
    Hikaru Hikaru May 2017 Development
  • Beginner's z88dk help rqdI'm struggling to get my first z88dk C program to compile. My program is this: #include <spectrum.h> int main() { zx_border(INK_BLACK); } …

    ... C11, to adopt the unix i/o model and to natively integrate ... />
    What's a [i]driver[/i], in this context?
    [/quote ... do with keyboard and screen I/O I assume I don't, but you ... border colour directly through port 0xfe. Because port 0xfe is write-only ...
    Alcoholics Anonymous Alcoholics Anonymous June 2017 Development
  • ROM emulation in softwareHi, first of all -- I only have shallow / uni knowledge of hardware, electronics, and physics. So forgive me for asking things that are out of that …

    ... slot to some fast PC port and have the PC feed ... . Right now, as far as I can see, they are only ... the pi0 respond as an i/o device but it should be ...
    Alcoholics Anonymous Alcoholics Anonymous June 2017 Hardware
  • Need help from people with a +2A/+3Started a topic [url="https://www.worldofspectrum.org/forums/discussion/55141/need-help-from-people-with-a-2a-3"]here[/url] to get a broader reach, b…

    ... 48K/128K machines, I use a contended port and padding instructions ... of magic is possible without I/O contention. I remember doing A LOT ... this case much of initial port reads during the screen ... polling the port at.

    Edit: that [i]and[/i] it means ...
    Hikaru Hikaru September 2017 Development
  • Need help from people with a +2A/+3Started a topic [url="https://www.worldofspectrum.org/forums/discussion/55141/need-help-from-people-with-a-2a-3"]here[/url] to get a broader reach, b…

    ... I don't think this sort of magic is possible without I/O ... contention. I remember doing A ... to look at [i]Sidewize[/i], I’d already found ... a,($fd) ;[11]read port
    cp d ;[4 ... Notice, it reads the port [i]twice[/i] and leaves the ...
    Ast_A_Moore Ast_A_Moore September 2017 Development
  • Need help from people with a +2A/+3Started a topic [url="https://www.worldofspectrum.org/forums/discussion/55141/need-help-from-people-with-a-2a-3"]here[/url] to get a broader reach, b…

    ... in the long run without I/O contention.[/quote]
    Right. ... bitmap bytes perfectly. Of course, port contention (and memory contention if ... he uses uses an uncontended port. I think the execution of the ... the value read form the port is anything “less than” ...
    Ast_A_Moore Ast_A_Moore September 2017 Development
  • Please, convert your game to EP128The Enterprise is a Zilog Z80-based home computer first produced in 1985. It can simulate the specy screen, so most of the EP128 game is specy conver…

    ... a good start?... Since I know little of the ... Enterprise development?[/quote]
    I think for 1st step the ... program only the 0feh port I/O has to be changed ... still visit the forum), I do not know Pasmo ... EXOS header mentioned above. I use Sjasm, with the ...
    Geco Geco January 2018 Brand new software
  • Please, convert your game to EP128The Enterprise is a Zilog Z80-based home computer first produced in 1985. It can simulate the specy screen, so most of the EP128 game is specy conver…

    ... complex things...
    [/quote]
    I was thinking about it too ... attach here files, so I will prepare a simple conversion ... than on Speccy.
    Normally I worked with Speccy TAP files ... to convert the 0feh port i/o's to enterprise port i/o's, and finally ...
    Geco Geco January 2018 Brand new software
  • Please, convert your game to EP128The Enterprise is a Zilog Z80-based home computer first produced in 1985. It can simulate the specy screen, so most of the EP128 game is specy conver…

    ... tick [b]Enable virtual file I/O[/b]
    [b]Load ... +Q) Select a tape file I/O configuration ex: [b]EP_640k_Tape_FileIO_TASMON.cfg ... )
    [quote="kgmcneil;930711"]
    I see there is a vast ... , and then we started to port CPC games too.
    [quote ...
    Geco Geco January 2018 Brand new software
  • Please, convert your game to EP128The Enterprise is a Zilog Z80-based home computer first produced in 1985. It can simulate the specy screen, so most of the EP128 game is specy conver…

    ... with disk images - thanks!!!... I notice however that this method ... directory, if using the File-I/O rom)...

    This ... graphical capabilities...

    I noticed that the 48k emulator ... for PLAY due to port redirections in the code?)...
    kgmcneil kgmcneil January 2018 Brand new software
  • Please, convert your game to EP128The Enterprise is a Zilog Z80-based home computer first produced in 1985. It can simulate the specy screen, so most of the EP128 game is specy conver…

    ... :) The problem is that File I/O is a kind of file ... , if using the File-I/O rom)...
    I noticed that the 48k ... with it, it checks Speccy port I/O , and checks attribute writes, and ... playing, because this program convert port I/O of speccy programs on the ...
    Geco Geco January 2018 Brand new software
  • Making sound using the BEEPER in AssemblyI had a look at the the documentation but it doesn't make sense to me. To make music just the beeper all I have to do is send ones and zeros to one o…

    ... you avoid ever hitting an I/O contended cycle, the sound loop ... the high byte of the port address. Finally, at least during ... floating bus, I determined that the +2A/+3 apply port contention in ... of code that will test port contention? Something that would make ...
    Ast_A_Moore Ast_A_Moore July 2018 Assembler
  • Making sound using the BEEPER in AssemblyI had a look at the the documentation but it doesn't make sense to me. To make music just the beeper all I have to do is send ones and zeros to one o…

    ... . Does that perhaps mean that I/O contention does not delay the ... the high byte of the port address, because after the first ... B is always 0. Yeah, I know it's really hot ...
    utz utz July 2018 Assembler
  • Making sound using the BEEPER in AssemblyI had a look at the the documentation but it doesn't make sense to me. To make music just the beeper all I have to do is send ones and zeros to one o…

    ... . Does that perhaps mean that I/O contention does not delay the ... an intricate pattern of port contention, which I can’t reproduce (at ... the high byte of the port address, because after the first ... instruction.

    In fact, I’ll make the loop slightly ...
    Ast_A_Moore Ast_A_Moore July 2018 Assembler
  • Making sound using the BEEPER in AssemblyI had a look at the the documentation but it doesn't make sense to me. To make music just the beeper all I have to do is send ones and zeros to one o…

    ... can see the influence of I/O contention with a loop like ...
    ld bc,#00FE ;BC: port
    .loop
    add hl ...
    Hikaru Hikaru July 2018 Assembler
<1…15161718192021…34>

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