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Search Again :: Adv Search 1000 results in 0.008s
<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…

    ... and thinking that perhaps full port decoding would have been a good ... a Timex (which uses full port decoding). But there is another problem ... with any other hardware. This port was chosen for use with ...
    guesser guesser June 2010 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
  • 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] …

    ... testing on the Spectranet through port. PM sent.

    What ... , and does it do full port decoding?[/QUOTE]

    It uses ...
    Cookie Cookie February 2008 Hardware
  • BBC microI was often made aware by people at the time that the beeb was the "best computer in the world." Even my next-door neighbour ( who was a bit of a co…

    ... on your through port, and monitoring the through port ROMCS line because ... ROM. That allied with incomplete port decoding makes adding hardware of more ... MREQ high on the through port and said tough luck!)
    Winston Winston March 2008 Chit chat
  • Spectrum Analog interfaceHello Spectrum addicts, Feels good to join you :) I'm trying to build an analog joystick interface for our beloved machine. I've set up a page here:…

    ... 74HCT688 magnitude comparator for the port decoding. Simple to use, ... make the I/O port selectable with a DIL ... problems when you're using port 0 - you should ... />
    On partial port decoding, I would avoid it. Back ... up on a through port of something and end ...
    Winston Winston April 2008 Hardware
  • Spectrum Ethernet updateThis week's theme is [B]Frustration.[/B] [url]http://spectrum.alioth.net/doc/index.php/Current_events[/url] But I'm confident it will come right.

    ... an unavoidable consequence of partial port decoding. I'm trying primarily not ... 32K ports thanks to partial decoding, and the memory paging for ... to avoid your board's port range if the result is ...
    Winston Winston April 2008 Hardware
  • Spectrum Ethernet updateThis week's theme is [B]Frustration.[/B] [url]http://spectrum.alioth.net/doc/index.php/Current_events[/url] But I'm confident it will come right.

    ... an unavoidable consequence of partial port decoding. I'm trying primarily not ... people who govern IP and Port usage for the glorious internet ...
    icabod icabod April 2008 Hardware
  • Spectrum Ethernet updateThis week's theme is [B]Frustration.[/B] [url]http://spectrum.alioth.net/doc/index.php/Current_events[/url] But I'm confident it will come right.

    ... who govern IP and Port usage for the glorious ... thinking about picking a standard port whose device behaviour is ... high.
    This removes port clashing. Another sequence re-enables ... the extent of downstream partial port decoding.

    Edit: Just ...
    csmith csmith April 2008 Hardware
<1234567…34>

Latest Posts

  • European Software Titles with an English version
    harriusherbartio on 12:06PM
  • How Do You Categorize Your Speccy Software and Games?
    harriusherbartio on 11:21AM
  • Fixed Speccy Software. And which games remained unfixed?
    harriusherbartio on 11:01AM
  • I am currently watching.....
    Paradigm Shifter on 12:49AM
  • New video about S-video modification on Issue two 48K Spectrum.
    Renegade on April 21
  • Happy 40th Birthday to the Amstrad CPC464!
    rich_chandler on April 21
  • Another Birthday! The Game Boy Is 35!
    mel the bell on April 21
  • Elusive Strategy Games done by the Smaller or less Prolific Software Houses.
    harriusherbartio on April 21
  • 1992 Spectrum Software
    harriusherbartio on April 21
  • +3 Disk drive motor
    AndyC on April 21

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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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