World of Spectrum
  • Categories
  • Discussions
  • FAQ
  • Sign In
Home › Search
Title Search
@title beer Word 'beer' in title
User Search
  • @user admin Only posts by Admin
Text Search
  • @body beer Word 'beer' in the text
Phrase Search
"Hello World" Exact phrase match
Exclude Terms
  • car -red Search cars that are not red
"Or" Searches
  • honda | bmw 'honda' or 'bmw' results
Multi-Field
@(title,body) hello Both contain 'hello'
WildCard
  • hond* civ* Match all with an astrix
Combination
  • @title bmw @user admin
See more supported syntax examples
Search Again :: Adv Search 1000 results in 0.007s
<1…13141516171819…34>
  • 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…

    ... first screen byte on the +2A/+3 is displayed at T ... doing a HALT in the contended memory area, which works more ... I/O contention on the +2A/+3 in the first place).
    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 use a contended port and padding instructions ... that are not dependent on contended memory:

    ... />
    For the +2A/+3, a combination of a ... and an instruction that accesses contended memory works:

    2A/+3 is LD C ...
    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…

    ... added basic support for the +2A/+3 special paging modes, as ... memory to use all the contended pages (4,5,6,7 ...
    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…

    ... 4,5,6,7 for +2A/+3 (for 128/+2 they ... 5 set (the normal screen, contended). It accounts for the currently ...
    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…

    ... /> We’ve determined that the +2A/+3 machines have a floating ... /> The floating bus on the +2A/+3 behaves differently from the ... set).
    4. During non-contended intervals (that is, when the ... that was last read from contended memory (usually, the last ...
    Ast_A_Moore Ast_A_Moore September 2017 Development
  • Should I sell my +2A?The +2A was the last Spectrum I bought and to be honest I never gave it much use :| Unlike the 48k, 48+ and +2 grey on which I have played many ga…

    ... a 128K/+2 and a +2A and compare the sampled speech ... ]

    Wait, the spectrum +2A (and +2B, +3?) play samples ... ? [/quote]
    No, but the contended RAM banks are different (long ... sample was developed with the +2A in mind (or not properly ...
    Ast_A_Moore Ast_A_Moore September 2017 Hardware
  • Troubleshooting my +2To put this in context: a while back (i.e. late last year and earlier this year) I was looking to put together a compilation of modern Spectrum games…

    ... either the screen RAM (all contended banks), or all memory above ... (upper RAM) including any non-contended banks.
    Run a memory ... things until recently on my +2A. It has a noisy cassette ...
    The Mighty Dopethrone The Mighty Dopethrone October 2017 Hardware
  • Detecting +3 / +2AWhat's a simple but reliable way to detect if code is running on a +2A/+3? My first though was to try switching to ROM2 and then checking for the …

    ... 2, then found the +2A/+3 performance dropped off ... 8. But on a +2A it's restricted to ... function that writes to contended memory with alternate gaps ... slight variation, but the +2A would suffer badly in the ... trick of tripping up a +2A..?


    [ ...
    joefish joefish December 2017 Development
  • Detecting +3 / +2AWhat's a simple but reliable way to detect if code is running on a +2A/+3? My first though was to try switching to ROM2 and then checking for the …

    First it does some contended memory writing, counting as it ... 's a 128K/+2 or +2A/+3.

    Unfortunately, it ...
    joefish joefish December 2017 Development
  • Detecting +3 / +2AWhat's a simple but reliable way to detect if code is running on a +2A/+3? My first though was to try switching to ROM2 and then checking for the …

    ... percent reliable detection of a +2A/+3 that [i]does not ... 5800) ;place a byte from contended RAM on the bus
    2A/+3
    [/code]
    ... floating bus behaves on the +2A/+3. Follow the link ... any[/i] address in [i]contended[/i] RAM, and the ...
    Ast_A_Moore Ast_A_Moore December 2017 Development
  • Gandalf [z88dk][Nirvana Plus][128Kb]Gandalf 1.00 [url="https://drive.google.com/open?id=1T9HK0_isoMrfogSIJVhPGehjVIdFus4c"]Download Ver 1.00[/url] Long after the destruction of t…

    ... doesn't work on +2A and +3. Don't ... "I" register points into contended memory, snow will appear ... I" register points into contended memory and code is executing ... in a contended bank, the machine can ... changed which banks were contended on the +3. ...
    Alcoholics Anonymous Alcoholics Anonymous February 2018 Brand new software
  • Gandalf [z88dk][Nirvana Plus][128Kb]Gandalf 1.00 [url="https://drive.google.com/open?id=1T9HK0_isoMrfogSIJVhPGehjVIdFus4c"]Download Ver 1.00[/url] Long after the destruction of t…

    ... the "I" register points into contended memory, snow will appear on ... the "I" register points into contended memory and code is executing ... in a contended bank, the machine can crash ... .
    [/quote]

    The +2A and +3 don't suffer ...
    AndyC AndyC February 2018 Brand new software
  • Gandalf [z88dk][Nirvana Plus][128Kb]Gandalf 1.00 [url="https://drive.google.com/open?id=1T9HK0_isoMrfogSIJVhPGehjVIdFus4c"]Download Ver 1.00[/url] Long after the destruction of t…

    ... the "I" register points into contended memory, snow will appear on ... the "I" register points into contended memory and code is executing ... in a contended bank, the machine can crash ... .
    [/quote]

    The +2A and +3 don't suffer ...
    Ast_A_Moore Ast_A_Moore February 2018 Brand new software
  • Gandalf [z88dk][Nirvana Plus][128Kb]Gandalf 1.00 [url="https://drive.google.com/open?id=1T9HK0_isoMrfogSIJVhPGehjVIdFus4c"]Download Ver 1.00[/url] Long after the destruction of t…

    ... the "I" register points into contended memory, snow will appear on ... the "I" register points into contended memory and code is executing ... in a contended bank, the machine can crash ... .
    [/quote]

    The +2A and +3 don't suffer ...
    cgonzalez cgonzalez February 2018 Brand new software
  • Gandalf [z88dk][Nirvana Plus][128Kb]Gandalf 1.00 [url="https://drive.google.com/open?id=1T9HK0_isoMrfogSIJVhPGehjVIdFus4c"]Download Ver 1.00[/url] Long after the destruction of t…

    ... the "I" register points into contended memory, snow will appear on ... the "I" register points into contended memory and code is executing ... in a contended bank, the machine can crash ... .
    [/quote]

    The +2A and +3 don't suffer ...
    Ast_A_Moore Ast_A_Moore February 2018 Brand new software
  • The I register pointing to $40–$7f causes ULA snow and a crash. Or does it?I have heard it from numerous sources, including a few members of this forum, that 128K/+2 machines crash if the I register points to a range of $40–…

    ... even requires being in a contended bank in the top 16k ... banks 4 & 6 are contended on the +3.

    out (c),a ; +2A/+3 : disk motor off, 48k ...
    Alcoholics Anonymous Alcoholics Anonymous February 2018 Development
  • The I register pointing to $40–$7f causes ULA snow and a crash. Or does it?I have heard it from numerous sources, including a few members of this forum, that 128K/+2 machines crash if the I register points to a range of $40–…

    ... . If it’s a non-contended bank, then the same rule ... applies; if it’s a contended bank, then the snow effect ... EDITOR code). Bank 7 is contended, so the snow effect kicks ... you’re saying about the +2A/+3 yet. Will play around ...
    Ast_A_Moore Ast_A_Moore February 2018 Development
  • The I register pointing to $40–$7f causes ULA snow and a crash. Or does it?I have heard it from numerous sources, including a few members of this forum, that 128K/+2 machines crash if the I register points to a range of $40–…

    ... :

    [quote]
    if contended memory (i.e. RAM 4 ... /> Well, we know that the contended memory on these machines is ... ’t[/i] exist on the +2A/+3, then. I.e. no ...
    Ast_A_Moore Ast_A_Moore February 2018 Development
  • The I register pointing to $40–$7f causes ULA snow and a crash. Or does it?I have heard it from numerous sources, including a few members of this forum, that 128K/+2 machines crash if the I register points to a range of $40–…

    ... the I register when a contended RAM bank is paged in ... a 128K/+2 and a +2A/+3. Sometimes, if the game ...
    Ast_A_Moore Ast_A_Moore February 2018 Development
  • 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…

    ... ever hitting an I/O contended cycle, the sound loop will ... on whether Port 254 is contended or not (not all Spectrum ... ports are contended). It would also depend on ... bus, I determined that the +2A/+3 apply port contention in ...
    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…

    ... I know port 254 is contended on all models up to ... +2, but is uncontended on +2A and up, as well as ...
    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…

    ... for I/O contention, the +2A/+3 applies contention only if ... on these machines is non-contended. Previous models applied contention whenever ... a contended address appeared on the address ...
    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…

    ... br /> +2A/+3 pattern
    T states [0;6] are contended, T ... br /> Think of doing a contended R/W action as getting ... +2A this is T state 7.
    If a contended ... up.

    Contended I/O:
    On the ... IN/OUT opcodes are contended, and the pattern is ...
    Hikaru Hikaru July 2018 Assembler
  • 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…

    ... as possible to a real +2A/+3. Then the game will ... it’s running on a +2A/+3 and then makes the ... if we're on a +2A/+3. If we're not ...

    ld a,(2899) ;+2A/+3 ROMs return 126
    contended memory and fetch a "blanking ...
    Ast_A_Moore Ast_A_Moore February 2019 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…

    ... from unattached ports, whereas the +2A and +3 ASIC, when memory ... read from, or written to, contended memory by the Z80, but ... set in all cases. The +2A/+3 floating bytes will appear ... ---- ---- --0-). With paging disabled, the +2A/+3 will always return #FF ...
    Ast_A_Moore Ast_A_Moore November 2019 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…

    ... original models is simply 6 contended and 2 uncontended cycles, that ... , the pattern of +2A/+3 models is 7 contended and 1 uncontended ... cycle, with glitch of 1 contended cycle before that).

    Patrik Rak Patrik Rak November 2019 Development
  • Delay routineAs some people are aware, I have recently starting writing a [url=http://fuse-emulator.svn.sourceforge.net/viewvc/fuse-emulator/trunk/fusetest/]autom…

    ... would not work properly on +2A/+3 in some all-RAM ... when the memory might be contended...
    Patrik Rak Patrik Rak November 2019 Development
<1…13141516171819…34>

Latest Posts

  • 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
  • European Software Titles with an English version
    harriusherbartio 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
  • Celebrity deaths...
    mel the bell on April 20

HitBox

Word Docs Hits
contended 1.2K 2K
2a 7.2K 10.4K

Related Threads

  • +2aI have a +2a and it wont boot properly get the white border with black square when first powerd on but then just goes into a black screen instead of …
  • Which expansions can I attach to a +2A?I have several peripherals that I would like to connect to a +2A: an Interface 1 with Microdrive, a +D disk interface and kempston joystick interface…
  • sound on +2ACan someone let me know what sound output there is on the sound socket of the +2A? I mean is there sound on both ears if headphones are plugged in. …
  • Search ZX Spectrum +2A MainboardHello!<br /> <br /> Please help!<br /> <br /> I search a mainboard for my ZX-Spectrum +2a.<br /> <br /> Thanks.<br /> <br /> Torsten.
  • +2A external tape loadingGot a +2A on the way and will want to load externally.<br /> <br /> Now I know that the +2A is basically a stripped down +3 with a tape deck instead …
  • What are the differences between the +2 and the +2A ?I only acquired a +2 for the first time in my life a few months ago. It works fine. :) I even managed to tracke down nearly all the wargames by the s…
  • Connecting a data recorder to a +2A?I have a +2A Spectrum, and getting increasingly frustrated by the unreliable built-in data recorder, I decided to start using an external one. <br />…
  • what are exact current values on +2A's PSUI like to know what is written on an original +2A PSU nearby each voltage.<br /> I mean the current for +5V, the current for +12V and the current for…
  • READ HERE! AUDIO IN FOR 128+2A???hey my name is Paolo and I'm from Italy..this is the first time that I post on this forum..I would like to connect or create an EAR input or somethin…
  • Kempston Interface Work On 128k +2aHi need some advise <br /> <br /> Will a Kempston Interface work on a 128k +2a<br /> machine ? ? , if so wish one would be best to use , so looking f…

Related Searches

  • 2a timing
  • f i r e 2a
  • 2a
  • 2a differences
  • 2a new rom
  • led storm contended
  • crash contended
  • spectrum 2a ear input
  • spectrum 2a otla
  • 2a 2b
  • 2a compatability
  • 2a definitive
  • 2a 3
  • bubble bobble 2a
  • cyberun 2a
  • spectrum 2a ghost program
  • 2a rgb
  • renegade 2a
  • ad724 2a
  • 2a fix

Copyright © 2024 World of Spectrum