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 0.014s
<1234567…34>
  • VSYNC FunctionI have written a VSYNC function, so that I can clear the screen before redraw without flicker on the screen, I do this by peeking at the address 2367…

    The Z80 mnemonic HALT lets the CPU wait until VSYNC (or Interupt) before allows the program continuation.
    LCD LCD May 2004 Development
  • Unconventional way of diagnosing a faultHi everyone Some time ago I got a 48k Spectrum (issue 3B board) in a pretty bad condition. I believe the power supply transistor TR4 failed, causing…

    ... the ALIAC-1 breadboarded experimental Z80 computer I built late last ... 0x8000, and held the Z80 in the reset state while I loaded ...
    Winston Winston May 2007 Hardware
  • R.I.P. spectrum 48kRecently one of my 48k rubber key (issue 4) machine bit the dust the other day when I tried to power it on. When powering it on, it gave a weird 'bee…

    ... br />
    BTW. Triggering the Z80 Reset line is simple. There is ... a reset "pin" on the edge ... then the Z80 will be held in reset. Releasing the reset line takes ... the Z80 out of reset. You ...
    bladerunner bladerunner February 2009 Hardware
  • Beta testing FuseHello everyone, We are preparing Fuse for a new release soon and would appreciate help in testing that all the new features and all the old features …

    ... reset may fix your problems, since Fuse never bothers doing an initial ... hard reset for a peripheral if ... and then do a soft reset. The resulting non-deterministic behaviour ...
    zub zub February 2013 Announcements
  • ZXMAK2Hi everyone, I'm glad to present you the latest version of my emulator - ZXMAK2 :) There are a lot of changes were made since the last topic about t…

    ... />
    [*] Some fixes for Z80 emulation (include reset behavior that discussed here ...
    ZXMAK ZXMAK January 2015 Emulators
  • ZX ROM in 64 characters a lineDear ZXS users, I am glad the today's release is not only concerning MB-02+ as it is normally the case with me, but it concerns really everyone, sinc…

    ... .speccy.cz/other/font64editor_for_divxxx.Z80[/url]
    After reset you can use ...
    velesoft velesoft June 2017 Sinclair Basic
  • Address bus contents (i.e. PC) during execution of HALTI'm wondering if anyone can tell me what's placed on the address bus during execution of HALT, beyond the initial M1 cycle. The Z80 user manual state…

    ... during execution of HALT, beyond the initial M1 cycle. The Z80 user manual ... HALT instruction each time, what need would there before for the Z80 ... code for HALT:

    [CODE] case 0x76: /* HALT */
    z80.halted=1 ...
    zub zub March 2014 Hardware
  • Z80 Special ResetThe Z80 CPU has two types of reset, normal and special. The latter is little-known and for more information please see [url]http://www.primrosebank.n…

    The Z80 CPU has two types of reset, normal and special. The latter ... ]http://www.primrosebank.net/computers/z80/z80_special_reset.htm[/url]

    reset or my article would be ...
    TonyB TonyB January 2015 Hardware
  • z80 assembly helpEver since I was a child I wanted to program my zx81 then my zx spectrum + 2. However, it was such a mystical beast and I only ever used BASIC not kn…

    ... started reading numerous books around z80 assembly. It's slow going ... .
    ld (xcoord),a ; set initial x coordinate.
    loop call ... our delay counter
    delay0 halt ??
    djnz delay0 ??
    ret ...
    antonyjones101 antonyjones101 September 2015 Development
  • "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. I've been working on a z80 emulator (for academic and rec…

    ... 've been working on a z80 emulator (for academic and recreational ... have been using http://www.z80.info/decoding.htm#intro to ... seems to incorrectly specify a HALT opcode as 0x7[i]7 ...
    Travis Kaufman Travis Kaufman July 2016 Development
  • Machine Code ChallengeHere's a challenge for all you Z80 programmers. Points to be awarded for elegance and brevity. (I haven't got the solution either) HL addresses the …

    ... a challenge for all you Z80 programmers. Points to be awarded ... make it difficult, the first reset bit encountered is not to ... , i.e. bit 7 of initial HL, is known to be ...
    Geoff Geoff July 2002 Sinclair Miscellaneous
  • Machine Code Sprites Example Code Using Char Based SystemBelow is my WIP code to do smooth screen wrapping sprites using char positions and offsets, as opposed to writing direct to a line (0-191) and shifti…

    ... co.uk/downloads/char5.z80"]http://www.peargames.co ... .uk/downloads/char5.z80[/url]

    < ... /> MainLoop:


    HALT ; Wait for VSYNC Refresh
    LD (IX+2),0 ; Reset x offset to 0
    robpearmain robpearmain August 2004 Development
  • ADCI'm a little confused about how the Z80 manages the ADC instruction. I'm assuming two ADD instructions are performed (am I wrong?!) I can think of 3 …

    ... little confused about how the Z80 manages the ADC instruction. ... sets Carry but this is reset when ADD A,0 ... the first addition corrupt the initial carry setting)

    ... but I'm sure the Z80 doesn't use a ... do it. Is my initial assumption of two ADDs wrong ...
    Unique Unique February 2005 Development
  • R Register, Contended RAM and ClonesHi. I've had a quick look at the CSS FAQ but didn't spot quite what I'm looking for (also the CSS FAQ doesn't have much detail of the clones - there …

    ... register. At one point I reset it, and at several points ... as there's a single HALT.

    So my questions ... -register is internal to the Z80, but thought I'd ask ... without the contended RAM the HALT would take place earlier, essentially ...
    icabod icabod July 2006 Development
  • Comments for small "sprite" routine wantedI have just written my first machine code program and I am quite happy (and proud) to get it working! :smile: As a child I never learned anything e…

    ... .se/zx/move-sprite-1.z80"]here[/URL].

    I ... />
    [B]wait[/B]
    halt ;halt when all row is completed ... )

    ld e,8 ;reset e, number of rows in ... [/B]
    ld c,8 ;reset c, number of side movements ...
    Rickard Rickard May 2007 Development
  • Spin problems/issuesI am running Spin 0.666 and have noticed a few issues (some are bugs, some might be just me). I am using Vista sp1 (yeah I know!), and I've seen Dunn…

    ... ]
    Place breakpoints on the HALT and RET instructions. Set PC ... "run". The Z80 will now freeze at the HALT instruction because no ... debugger is stuck on the HALT instruction. Press "step over". It ... Okay. The machine should now reset itself. Now go back to ...
    Jimmy Jimmy April 2008 Emulators
  • IN 255 behaviour not emulated in Spectaculator and ZXSpinI'm not speaking about "normal" IN 255 behaviour. All of you know what I'm taking about: IN 255 can be used to "read" screen data as it's retrieved f…

    ... use port 255 for the initial sync.

    More precisely ... it has finished. When the Z80 resumes operation, the ULA has ...

    TestInFF proc
    halt
    ld c,255
    mcleod_ideafix mcleod_ideafix January 2009 Hardware
  • Some ever noticed that +2A/+3 halts Z80 using WAIT?I mean: Anyone ever noticed that the +2A/+3 halts the Z80 using WAIT? All documentation I've read about contention state that the ULA halts the Z80 …

    ... the +2A/+3 halts the Z80 using WAIT?

    All ... that the ULA halts the Z80 by forcing CLK high. I ... mount ULA) uses WAIT to halt the CPU. I haven't ... to put a Z804020 CPU (Z80 capable of 20MHz clock), isolate ...
    mcleod_ideafix mcleod_ideafix October 2009 Hardware
  • yeah - unix for zx spectrumI started a new hobby project. An operating system for ZX Spectrum. A unix clone. Talked to my friend about it and he asked me what if after I'm done…

    ... speccy ROM. Here are my initial thoughts about what I should ... small).

    3. Since Z80 has no MMU or superviser ... generating dangerous code (such as HALT, IMn, EI, DI). Assembler shall ...
    tstih tstih January 2011 Development
  • z80 Startuphi everyone, does the z80 upon start up reset all registers (including A) to 0? Many thanks, Robin

    hi everyone,

    does the z80 upon start up reset all registers (including A) to 0?
    Many thanks,
    Robin
    Robin Robin August 2011 Hardware
  • Kiwi OS for z80 computerHi everyone, Nearly made my z80 computer with 2K ROM 32K RAM. It has an OS im still writing called Kiwi (apple, blackberry, you get the idea ;D) he…

    ... ,

    Nearly made my z80 computer with 2K ROM 32K ... , $2A ;LOAD A WITH RESET SDA RESET SCLW RITE MODE (00101010)
    RESET SDA RESET SCL READ MODE (00100110)
    RESET SDA RESET SCL READ MODE 00100110
    Robin Robin August 2011 Announcements
  • Z80 snapshot formatI read documentation for Z80 snapshot on WOS and see in table possibility insert ROM image to Z80 file. Here is full table: [code]The pages are numb…

    ... possibility insert ROM image to Z80 file.

    ...
    2 - [B]rom (reset)[/B] samram rom (basic)
    Z80 file ? I test ZX ... 't save Z80...).

    Here is Z80 snapshot 128kB with ...
    velesoft velesoft August 2012 Emulators
  • ZX Spectrum+ DivMMC EnJOY! Grundig 16" LCD TV and books.The Spectrum is in very good condition. Composite video mod. New mambrane (bought in November 2014 from rwap_software [url]http://www.sellmyretro.co…

    ... "Upgraded".

    - Replaced Z80 with supplied CPU and socket ... corroded).
    - Standard initial tests suggest no faults.
    Reset time suggests 48K operation. All ... - Fitted supplied socket and new Z80.
    - Power on: ...
    pitu pitu January 2015 Sales
  • HALT: Why always 4ts?Instruction breakdown of halt is like that: PC 4ts. That means it fetches instruction byte from ram which tooks 4 ts and then does nothing and read…

    Instruction breakdown of halt is like that:

    ... again until a reset or interrupt.

    if halt is already ... and again to execute the HALT, why it still takes 4 ... /> I mean if cpu executed HALT at cycle 5, and if ...
    Arda Arda February 2015 Development
  • 20+ years of X128!Hard to believe, but it's true! I was inspired by Gerton Lunter's Z80 (which I had used for years) and I wanted to make my own Spectrum emulator. …

    ... inspired by Gerton Lunter's Z80 (which I had used for ... development purposes.

    The initial development was done with gcc ... proper releases ground to a halt with V0.94 on 02 ...
    Jmk Jmk March 2016 Emulators
  • Spectrum and Z80 emulators with Python APIHello everybody, It may be the right time to create a topic for these two emulators. They are not at the initial release point yet, but might be w…

    ... . They are not at the initial release point yet, but might ...
    * https://github.com/kosarev/z80

    As of today ... part is capable of running .z80 and .rzx files. It is ... next step was getting a Z80 emulator that is flexible enough ...
    kosarev kosarev May 2019 Emulators
  • ZEsarUX 8.1 stableHi! I've uploaded a new ZEsarUX 8.1 stable version. Go to the github released webpage to download it: https://github.com/chernandezba/zesaru…

    ... br /> Added setting to reset configuration file to default values ... /> -added copper opcodes NOOP, HALT
    -increased tbblue.mmc ... resolution
    Improved accurate Z80 timing: IM mode 0 ... Fixed loading and saving +3 .z80 snapshots
    Fixed placing ...
    chernandezba chernandezba February 2020 Emulators
  • Zero v0.8Pigs can apparently fly because it's the v0.8 update of Zero that no one asked for but is out for public consumption anyway. Grab it [url="https:/…

    ... (azesmbog).
    - Fixed incorrect AY reset behaviour (azesmbog).
    - Fixed window ... snapshot (woody).
    - Fixed incorrect HALT implementation (ZjoyKiler).
    - Fixed ... azesmbog)
    - Fixed loading of z80 snapshots with invalid tstate values ...
    Arjun Arjun January 2022 Emulators
  • WANTED: tape replacement for +2?Any tape replacement possible for a +2? My +2 works wonderfully but the incorporated datacorder is simply worn out and won't load ANYTHING. Dirty sig…

    ... 254 with bit 4 reset will give a reset bit 6 from ...

    ORG 50000
    HALT ;synchronize with interrupts
    LD ... and address buses of the Z80 and the ULA are connected ... buses. However, if the Z80 wants to read or write ...
    Dr BEEP Dr BEEP November 2001 Sales
<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

HitBox

Word Docs Hits
z80 13.7K 21.5K
initial 2.8K 3.2K
halt 1.1K 1.6K
reset 4.8K 6.9K

Related Threads

  • "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…
  • Z80 Special ResetThe Z80 CPU has two types of reset, normal and special. The latter is little-known and for more information please see<br /> [url]http://www.primrose…
  • Of course, when the M1 line of the Z80 CPU is failing, the Z80 CPU must be replaced![quote]Of course, when the M1 line of the Z80 CPU is failing, the Z80 CPU must be replaced![/quote]<br /> Err, why?<br /> <br /> If you are trying…
  • Z80/SNA Compiler under Windows???Does anybody know anything about Z80/SNA compiler under Windows???
  • Z80, TZX and TAP formatsHi again <br /> I?ve seen these three formats as the most common of all. The doubt is... Which is the best of them? What are the differences between …
  • Z80 to DSK?Does anyone know if there is a prog that can convert z80,tzx or tap files to<br /> dsk format? I have access to a friends pc that has a 3 inch drive …
  • Z80/SNA compiler under Windows???Does anybody know anything about Z80/SNA compiler under Windows???
  • Visible-Z80 - VISZ80 - by Miklos PatrubanyHi All !<br /> <br /> Visible-Z80 - VISZ80 - by Miklos Patrubany<br /> <br /> Does anyone have this program ?<br /> Please help me.<br /> <br /> …
  • Converting TAP to Z80Is there an EXE out there that will convert *.TAP into any other snapshot (preverably Z80 or SNA)<br /> <br /> Please Help<br /> <br /> Oatesy

Related Searches

  • z80
  • z80 to tape
  • z80 compiler
  • z80 m1
  • issue 2 initial sequence
  • initial sequence
  • self reset
  • 2a reset
  • initial value z80
  • initial z80
  • z80 soft reset
  • initial state z80 registers
  • halt reset
  • z80 initial contents
  • z80 initial
  • z80 reset
  • z80 halt
  • snapshot z80 reset
  • snapshot z80 reset 3e
  • snapshot z80 reset 3dos

Copyright © 2024 World of Spectrum