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<1…11121314151617…34>
  • 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/O contention and the 224 vs 228 t-states/scanline difference ... though.[/quote]
    I/O contention I understand, but other than ...
    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…

    ... , due to the additional wait states. Hence there would be some ... the +2A/+3 apply port contention in a way that is ... code that will test port contention? Something that would make it ...
    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…

    ... the influence of I/O contention with a loop like this ... add some 10-20 T states per an OUT perhaps, but ... happens once per 1208 T states. Of course, this makes for ... occurs once every 52 T states regardless of the tone frequency ...
    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…

    ... wave ?[/quote]
    11 T states for OUT (C),A vs ... . 12 T states for OUT (XX),A. ( ... is the aforementioned I/O contention issue. In order to work ... a multiple of 8 t-states, like @Hikaru mentioned. With ... a byte in 5 t-states.

    That said, ...
    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…

    ... cyclic, repeating every 8 T states. The easiest way for me ... /> 48K/128K pattern
    T states [0;5] are contended, T ... obvious on which exact T states 'within' individual Z80 opcodes the ... might 'contain' more than one contention point depending on the number ...
    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…

    ... intervals between the contended T states of OUT commands (T state ... upper border. There is no contention during this time. Then once ... OUT commands is hit by contention for the first time. This ... command would be hit by contention just once per each loop ...
    Hikaru Hikaru July 2018 Assembler
  • Raster effects - quick questionHi Guys Just a quick question regards what the ULA is doing as its drawing each scan line. Assuming the beam has finished drawing the border, am I…

    ... screen refresh, then use t-states to estimate position of beam ... time of about 1800 T states which you can use for ... . The limit is some 22..24 characters. Thankfully, with 8x2 and ...
    Hikaru Hikaru August 2019 Development
  • Raster effects - quick questionHi Guys Just a quick question regards what the ULA is doing as its drawing each scan line. Assuming the beam has finished drawing the border, am I…

    ... left. So for 96 T-states per line there is no ... start relative to the ULA contention pattern, and at exactly which ... /> But in many cases the contention pattern actually helps you synchronise ...
    joefish joefish August 2019 Development
  • Fuse/SPIN vs Spectaculator border timingsHello, I'm trying to figure out at which moments the 48K ULA samples the current border color into its internal latch. To do that I wrote a small …

    ... corrects them. But 64x224 T states after an int is generated ... .5MHz ahead of the first contention cycle.

    There is ...
    Alcoholics Anonymous Alcoholics Anonymous October 2019 Emulators
  • How do emulators make code appears as running at 3.5Mhz?Decent Z80 emulators on github return t-states after executing an instruction, giving you the ability to emulate Speccy relatively well. But there ar…

    ... -States elapsed since the last write. Assuming that you're implementing contention ... frame timing, emulate enough T-States to get to the magic ...
    Dunny Dunny October 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…

    ... "ERROR: delays below 131 t-states are not supported"
    ASSERT ... : cp (hl) ; add 2 t-states if bit 1 is 0 ... ,.skip4 : ccf ; add 4 t-states if bit 2 is 0 ... c,.plus8 ; add 8 t-states if bit 3 is 1 ... 16 t-states if bit 4 is 0; DB 24 is JR ...
    introspec introspec October 2019 Development
  • Can someone run this test program on a real Spectrum 48K?I've knocked up a small test program just to satisfy my emulation OCD if someone with a real 48K Spectrum can spare a couple of minutes to run it.? …

    ... ]

    The difference is contention and timing, etc, are behaviours ... end up with tables, contention patterns, counting T states, etc.

    Alcoholics Anonymous Alcoholics Anonymous November 2019 Emulators
  • What to write / programme?I've been trying to get back some motivation to write something in machine code for the Spectrum. I don't feel I am organised enough to write somethi…

    ... />
    POP BC = 10 T states

    An equivalent:
    LD B,(HL) = 7 T states
    INC HL = 6 T ... /> LD C,(HL) = 7 T States
    INC HL = 6 T ... XXXXXXXX 8 XXXXXXXX 16 XXXXXXXX 24 XXXXXXXX 32 XXXXXXXX
    1 ...
    dmsmith dmsmith March 2020 Development
  • Tricks to make mirror image of a graphic?I've been working on a sprite routine for lots of sprites and animations. I'm only storing right facing graphics, and converting them to left facing.…

    ... not set, deduct 2 T-States.

    [code]; 17 + (26 ... mirror table takes 333 T-States for an 8x8 character square ... variable 434 - 450 T-States.
    [code]; 24 + (38 * 8 = 304) - 5 ... + 10 = 333 T-States

    FrankT FrankT December 2020 Assembler
  • How to Use a real Physical Old Style Retro ZX Spectrum INFREQUENTLY and EFFECTIVELY.These days a lot of WOSSERS use emulators most of the time but like to get out the old Speccy ,every once in a while ,for a quick nostalgic revisit .…

    ... five Spectrums are in various states of repair - my original +2 ... that I now know is 24 years old and will be ...
    The Mighty Dopethrone The Mighty Dopethrone January 2021 Hardware
  • spdif adapterIs there some kind of adapter that would allow direct loading of data from spdif? I mean lossless data like dat/cd.. (to avoid long and unreliable l…

    48kHz 24 bit stereo would give you ... still need to avoid ULA contention though I guess, and possibly ...
    i love the z80s i love the z80s December 2021 Hardware
  • Ukraine CrisisThe other thread got a bit muddled and I wanted to start one on more recent, hopeful (even if only slightly) developments. https://www.reuters.com…

    ... ]

    [quote]The United States called on Russia to immediately ... since invading Ukraine on Feb. 24 in what it calls a ...
    Luzie Luzie July 2022 Chit chat
  • The Rant Thread.A thread to rant and ramble about stuff that makes you mad: 1) Why can't women say things in only a few words.Instead of a simple yes, no, we…

    ... global population;
    – Eliminate nation-states & establish One World Government ... , we will be digitally surveilled 24 hours a day, 7 days ...
    Ælita Ælita August 2022 Chit chat
  • 5.25 to PC ??I have a speccy and a Plus D - I saved all my stuff on 5.24 in disks, but now the plus D is kapoot. Does anyonyone know how I can get my stuuf to loa…

    I have a speccy and a Plus D - I saved all my stuff on 5.24 in disks, but now the plus D is kapoot. Does anyonyone know how I can get my stuuf to load on a pc !!!
    Bob Bob December 2001 Sinclair Miscellaneous
  • LINE-routine and other nice pieces of codeThe line-topic came in the end with a nice piece of fast coding. I think that there might be more of these routines out there (where-ever-u-r). Isn…

    ... to start emulating : 36 T states !! (sum (..) )
    Dr BEEP Dr BEEP October 2001 Sinclair Miscellaneous
  • SPECCY+2 110V POWER SUPPLYI live in the USA and I bought a ZX Spectrum 128k +2 in eBay.com. The problem is that i don't know how to turn it on. All the major US appliances use…

    ... !

    Also, the United States uses NTSC instead of PAL ...
    Bruno Florindo Bruno Florindo April 2001 Sinclair Miscellaneous
  • Speccy Mags For Sale! I have the following magazines for sale, anyone interested, please contact. CRASH Issues:- 42 - July 87; 43 - Aug 87; 44 - Sept 87; 45 - Oct 87; …

    ... - May 87; 22 - Oct 87; 24 - Dec 87; 27 - March 88 ...
    Chris Chris April 2001 Sales
  • Amstrad/Sprectrum Amstrad in the UK are advertising an E-Mail telepone system which has a small screen attached, in the advertising it states that you can download a…

    Amstrad in the UK are advertising an E-Mail telepone system which has a small screen attached, in the advertising it states that you can download and play Spectrum games.

    Just thought that I would mention it.
    Washac Washac March 2002 Sinclair Miscellaneous
  • Various games wantedHi, I'm after the following games for my collection and have LOTS of games to trade. For some games I'm willing to offer multiple games in exchange …

    ... by: Gilby on 2002-05-24 10:41 ]
    Gilby Gilby March 2002 Wanted
  • Spectaculator 2.0 availableHi, I've just released a new version of Spectaculator. It should be on WOS in a few days. Here's a cut 'n' paste from comp.sys.sinclair: Spectacula…

    ... rewind

    o Memory contention and scanline-based multicolour rendering ...
    Jon Needle Jon Needle April 2002 Emulators
  • THE SPECTRUM QUIZ IS HEREOkay folks, here are 30 questions. The person who EMAILS them to me with the most correct is the winner. No cheating, use your memory and not the W…

    ... helmet in Pyjamarama.

    24 After what level number on ...
    GeeKay GeeKay April 2002 Games
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