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Search Again :: Adv Search 1000 results in 0.036s
<1234567…34>
  • 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 Spectrum reads from a port whose number matches the criteria ... would be IN/OUT from port 0000h, as that triggers any ... "IN 31", corresponds to a port address of "????????00011111", but what ...
    GOC GOC August 2004 Development
  • RFC: ZXI hardware interface standardisationReposted from c.s.s to reach a wider audience [QUOTE=Andrew Owen] You may have noticed that there are more people making add-ons for the Speccy than…

    ... work together, or with existing peripherals. For example, divIDE+ flat out ... a Timex (which uses full port decoding). But there is another problem ... for a decent range of peripherals and reassure buyers that they ... : ZXI (interface standard for ZX peripherals)
    guesser guesser June 2010 Hardware
  • Interface One - New FunctionalityAs you may (or may not) be aware the Interface One is a pretty powerful piece of kit. One of it's greatest features is being able to easily extended …

    ... ROM from being selected. Peripherals have to bring their own ... routine, and to allow multiple peripherals to be daisy chained, ... much easier to support multiple peripherals at the same time ... trapping an address (although incomplete port decoding is a bit of a ...
    Winston Winston July 2009 Development
  • Some ROM/EPROM questions...I've got a ZX Spectrum +, a +2A and +3 computers, and I've been using +3e project ROMS for a while in my +3. I was thinking about using an EEPROM or…

    ... all the time by Spectrum peripherals. Consider the Interface 1 - when ... flip flop IC and some port decoding (so you can do it ...
    Winston Winston June 2010 Hardware
  • Detecting presence of AY?I'm working on my first little demo for the ZX Spectrum. At the moment I'm aiming to keep the memory requirements low enough that it runs on a standa…

    ... thread:

    which port can be used as trash ... could simply provide a 'null' port

    can ... to that port ?[/QUOTE]

    Many peripherals will respond ... to 0xnn00, because of partial port decoding. There ...
    Philip Kendall Philip Kendall March 2012 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…

    ... . Still, I'd recommend full port decoding if possible as we're ... do I/O reads from peripherals on the expansion bus with ...
    zub zub April 2014 Hardware
  • Features that are still wanted in Spectrum emulation.Features that are still wanted in Spectrum emulation. 4 USB joystick/gamepad input for real multiplayer games - Yes, Bomb Munchies.... - Sinclair 12…

    ... port on that machine. As it is not compatible with Speccy peripherals ... someone please provide the port decoding for the K-55 ... interface, I believe the decoding is ‒‒‒‒‒‒‒‒ / 000‒‒‒‒‒ ... but for the loose decoding, Fuse has ‒‒‒‒‒‒‒‒ / ‒‒0‒‒‒‒‒ ...
    zub zub June 2015 Emulators
  • More "What could have been"... The Z280.So in chasing up the Loki specs, I happened upon some parallel developments... And had Sinclair gotten to make the Loki, there could have been some i…

    ... 's a z80 with integrated peripherals, faster clock and three or ... integrated peripherals would almost certainly interfere with the spectrum's loose port decoding ...
    Alcoholics Anonymous Alcoholics Anonymous September 2021 Hardware
  • ZX Evolution -- contended memory and raster emulationFresh bleeding update for [url=http://www.nedopc.com/zxevo/zxevo_eng.php]ZX Evolution[/url] [url=https://code.google.com/p/pentevo/source/list]Baseco…

    ... />
    3. There is no port FF currently. I'm not ... .

    4. Port decoding is still 'redundant' (means port #FE is decoded ... . Yet some hacks added for port #7FFC to work correctly.
    lvd lvd January 2015 Hardware
  • New Retro Virtual Machine v1.1.0Hello everyone, a new version of Retro Virtual Machine https://www.youtube.com/watch?v=vDXHnelI49A Change Log: Added the ZX Spectrum+ with s…

    ... a stupid bug in the port decoding, (I can’t believe that ...
    jcgamestoy jcgamestoy March 2016 Emulators
  • Test of screen switching timings.I modified the btime.tap test by Jan Bobrowski to explore the timing of screen switching. The new test, ptime-128, produces different results on diff…

    ... /+3 (on these machines the port decoding includes the 14th bit of ... all). To proceed to next port press the P key.
    weiv weiv November 2017 Emulators
  • Announce: EmuZWin 2.4.1.0 with exact AY soundEmuZWin 2.4.1.0 with exact AY sound released today. In "exact sound" mode, should be very, very close to real sound. (My ears are sick, my head is sp…

    Eye ache 2 works fine with port decoding set up as per the FAQ. Sound like you have an error somewhere else that's causing this effect.

    Regards,

    Jon.
    Jon Needle Jon Needle April 2004 Emulators
  • Announce: EmuZWin 2.4.1.0 with exact AY soundEmuZWin 2.4.1.0 with exact AY sound released today. In "exact sound" mode, should be very, very close to real sound. (My ears are sick, my head is sp…

    Eyeache 2 often does port writes using OUT (#FD),A. ... the high byte of the port address for that opcode?
    port decoding from the FAQ too.
    Woody Woody April 2004 Emulators
  • Announce: EmuZWin 2.4.1.0 with exact AY soundEmuZWin 2.4.1.0 with exact AY sound released today. In "exact sound" mode, should be very, very close to real sound. (My ears are sick, my head is sp…

    ... :
    Eyeache 2 often does port writes using OUT (#FD),A ... the high byte of the port address for that opcode?[/quote ... runs fine here with the port decoding from the FAQ too.
    port recognision always, if to follow ...
    Vladimir Kladov Vladimir Kladov April 2004 Emulators
  • Kempston emulation broken?Take an emulator of your choice (I chose Spectaculator and Spin) and load up Gauntlet 3. Choose to control player 1 with 'Kempston' and play the game…

    ... down to the port decoding. According to the FAQ, port $DF should not ... 's happened is that the port decoding was different on Kempston 'clones ... have a look at the decoding to see if there are ...
    Jon Needle Jon Needle September 2004 Emulators
  • Port 0x7ffd Partial DecodingI'm trying Pitfighter on my emulator and it runs in +2A/+3 mode but crashes in 128k/+2 mode. I traced it down to an OUT instruction which sends 4 to …

    ... the very same bug in port decoding :)

    Still, it's ... refresh my memory on the decoding bits in the FAQ and ...
    Woody Woody February 2005 Development
  • Port 0x7ffd Partial DecodingI'm trying Pitfighter on my emulator and it runs in +2A/+3 mode but crashes in 128k/+2 mode. I traced it down to an OUT instruction which sends 4 to …

    ... for details of how the port decoding differs between these models :)
    Jon Needle Jon Needle March 2005 Development
  • Zx Spectrum Laptop (again)I've been reading all the old treads about a possible portable speccy. I even found the one about the Speccy Laptop. But it seems there's a lot of ne…

    ... since the Spectrum ULA's port decoding merely consisted of checking the ...
    Winston Winston March 2007 Sinclair Miscellaneous
  • Dead Spectrum +Hi all, I've recently dug out my old Spectrum + with the idea of repairing it. When I last looked at it, when I was much younger, I was soldering a …

    ... and some minimal I/O port decoding - it'll allow me to ...
    Winston Winston March 2007 Hardware
  • toasted soeccysHello, ive jsut bought a pair of speccys on ebay (one 16k issue 2 & a prob 48k issue 3) unfortunaly the genius who sold them tried to see if the wor…

    ... just needs to consist of port decoding (really, in the case of ... a PC via the parallel port. Or even just an octal ...
    Winston Winston March 2007 Hardware
  • Regarding the interface with USB port[url]http://www.octocom.es/reuniones/art_madridsx07_11.html[/url] [url]http://velesoft.speccy.cz/kmouse/km-doc/kempston_mouse_turbo_interface/km-t_2…

    ... the Z80, the I/O port decoding would see IORQ go low ...
    Winston Winston March 2007 Hardware
  • Regarding the interface with USB port[url]http://www.octocom.es/reuniones/art_madridsx07_11.html[/url] [url]http://velesoft.speccy.cz/kmouse/km-doc/kempston_mouse_turbo_interface/km-t_2…

    ... the Z80, the I/O port decoding would see IORQ go low ...
    dtl dtl March 2007 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 - one ... />
    LEDs are selected with port 63, and the memory bank ... with port 31 (bits 0 to 4 ...
    Winston Winston April 2007 Hardware
  • TresLucesDeGlaurungLas(conquestador)hello i am trying to get the said title to work,i cannot use the kempston joystick when playing this game(i have tried cycling through all the joyst…

    ... work on genuine Kempston hardware (port $1f) but does work on ... other clones due to relaxed port decoding ($df).

    Spectaculator 7 ...
    Jon Needle Jon Needle April 2007 MIA/STP/SDP
  • External Speccy CommunicationHow does a speccy communicate with the outside world ?? Do you have to have the interface 1 for serial communications ( rs232 ) or are there other p…

    ... small - if I make the port decoding and memory all surface mount ...
    Winston Winston July 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…

    ... your hardware "completely decodes" port address 31. This means it ... responds to 127 other port address including port 1,2,3, ... 6,..... In this case the port decoding is "incomplete" and basically ... circuit will respond to other port addresses that someone else' ...
    Alcoholics Anonymous Alcoholics Anonymous October 2007 Hardware
  • Spectrum Emus for the DSSo what's the emu of choice then, I've got a DS on the way and one of those blank cart things, and the first thing I want to do is play Spectrum gam…

    Different Kempston port decoding? Some clone interfaces were "looser" ... /> If JTN2 assumed a "loose" decoding, but ZXDS uses a "strict ... " decoding, things could not work.
    < ...
    Philip Kendall Philip Kendall October 2007 Emulators
  • Spectrum Emus for the DSSo what's the emu of choice then, I've got a DS on the way and one of those blank cart things, and the first thing I want to do is play Spectrum gam…

    ... =Philip Kendall;223112]Different Kempston port decoding? Some clone interfaces were "looser ...
    Patrik Rak Patrik Rak November 2007 Emulators
  • ZXCF+/2 InterfaceHi all, I'm having a stock clearance sales.... ZXCF+ build and tested for only 30 Euro more on my site.. [url]http://user.tninet.se/~vjz762w/[/url] …

    That sounds good, I'd like one for testing on the Spectranet through port. PM sent.

    What Z80 I/O ports does it use, and does it do full port decoding?
    Winston Winston February 2008 Hardware
<1234567…34>

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Related Threads

  • 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 ?<br /> <br /> Does only one of the devi…
  • Port 0x7ffd Partial DecodingI'm trying Pitfighter on my emulator and it runs in +2A/+3 mode but crashes in 128k/+2 mode.<br /> I traced it down to an OUT instruction which sends…
  • "Decoding z80 Opcodes" (http://www.z80.info/decoding.htm#intro) - Incorrect HALT Opcode?Apologies if this is a dupe but I searched within the forums and couldn't find anything.<br /> <br /> I've been working on a z80 emulator (for acad…
  • Kempston Interface/Games cartridge portI recently bought an original Kempston joystick interface which features 3 rather nifty joystick ports (1 kemp, 2 sinclair) and a little slot which i…
  • printer port redirect to (Windows) system printerIs there any emulator (+2A/+3 compatible) that can be configured to output the, say, parallel printer port to the Windows system port ?<br /> The def…
  • Native OS X port of Fuse availableA beta version of Fredrick Meunier's native OS X port of Fuse, the Free errr... Unix Spectrum Emulator is now available from Fuse's homepage:<br /> <…
  • OT maybe: Surfing the web with C64 maybe someone can port this to spectrum?Hello!<br /> <br /> I just saw this on the net [url="http://dunkels.com/adam/contiki/"]http://dunkels.com/adam/contiki/[/url]<br /> <br /> 'The Conti…
  • Win32 port of Fuse availableAn alpha version of a port of Fuse, the increasingly inaccurately named Free Unix Spectrum Emulator, to Win32 is now available from the [url="http://…
  • TC2068 port 0xf5With regard to the TC2068, [url="http://www.worldofspectrum.org/faq/reference/tmxreference.htm"]the FAQ[/url] ("Sound chip" section) says "IN F5h alw…
  • what extra port for extra memory ? (256K, 512K, 1024K, etc.)I know that Pentagon uses some extra bits from port 7FFD for extra memory pging:<br /> - for 512K model, bit 6 &amp; 7 of port 7FFD<br /> - for 1024K…

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