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<1…16171819202122…34>
  • 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
  • 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
  • Reading Disks via ASMI'm hoping to port my Amstrad game to the spectrum (See the link in my sig for info) I will be targeting the 128 and +3 - the game will not work on …

    ... 's why I'm hopeful I can port the game ... /> Re Contention - I'm assuming I'm best putting sprite ... on calculations (255 bullets onscreen!)
    Ok, I will rule ... brainstorming stage!
    I could do a software ... will not fit. - I will certainly consider it ...
    keith56 keith56 July 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…

    ... 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…

    ... between the modes, I presume. Dunno, I would need to ... Notice, it reads the port [i]twice[/i] and leaves the loop ... contention, mind. I’ll be damned if I understand what the ... br /> , at least the way I understand it at the moment ... long run without I/O contention.
    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…

    ... 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
  • Summary : Fifty Pascal Programs by SybexI got around getting [url="http://www.worldofspectrum.org/infoseekid.cgi?id=2001037"]this book[/url] and have had a look through it which consists of…

    ...
    220 result:=(range/255);
    230 result:=(seed* ... random;[/code]

    I also wonder how effective the ... would be if toggling some I/O operations through compiler options ... br />
    Please understand I'm not using the Spectrum ...
    CP/M User CP/M User July 2018 Sinclair Miscellaneous
  • 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
  • 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…

    ... /> [/quote]
    I am [i]so[/i] not made for this ... . #:-S

    As for I/O contention, the +2A/+3 applies ... least in theory, all I/O access on these machines is ... high byte of the port on the 128K still ... t change anything, but I suspect it might have ...
    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…

    ... stuff up.

    Contended I/O:
    On the Sinclair models ... pattern is decided by the port number. This page https://faqwiki ... Contended_I/O provides a table to describe these patterns. For port #FE ... C:3" depending on the port MSB. In the first case ...
    Hikaru Hikaru July 2018 Assembler
  • If Sinclair computers had not been sold...I was just having a random thought. If Sinclair Computers (or the rights to them, not sure how it 'worked' back then) had not been sold to Amstrad…

    ... and documented the memory and I/O allocations.

    So ... keyboard, 80k RAM, cartridge port, built in joystick port, reset button, power ... chip plus parallel printer / user port, upgraded ROM)
    [*]ZX ... a mouse port and also with a I/F port for an ...
    1024MAK 1024MAK February 2019 Hardware
  • A Yankee in IraqI'm testing the game on the zx next and it currently hangs right after the game starts no matter what timing regimen and contention pattern is chosen…

    ... extra i/o contention caused by the loop reading from port 0x40ff is ... be missed in the port read. If I change the loop to ... read from port 0x00ff to avoid the i/o contention, the game ... runs. So I will have ...
    Alcoholics Anonymous Alcoholics Anonymous February 2019 Development
  • +2 midi/rs232/keypad connectors, what can be done with that?where from can we find more information about what can be done with +2 midi/rs232/keypad connectors? - about midi, for example, can we do similar thi…

    ... !

    For the port A I/O pins, yes decimal 14 is ... of information ;-)

    [b][i]Mark[/i][/b]
    1024MAK 1024MAK November 2019 Hardware
  • RS232 - built-in vs. Interface 1Hello all. After some advice, and I figured someone here would probably be able to help. I'm the owner of a (grey case) Spectrum +2, and I'm keen …

    ... proper hardware flow control.
    I wasted a lot of time ... PC because I foolishly assumed that the on board serial port would ... .
    Turns out the super I/O chips on "modern" PC motherboards ... bursts at the programmed baudrate. I swapped to a USB adapter ...
    guesser guesser May 2020 Hardware
<1…16171819202122…34>

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