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<1234567…34>
  • Timex contended memory timings, the TS2068 kludge board and EXROM at $4000 - $7FFFI haven't seen this documented anywhere yet so I thought I'd share my findings. I've been investigating contended memory timings on the Timex Sinclai…

    ... each location during the beep timing loop.

    When this program ... sync pulse and colour burst timing. You get a nice, centred ...
    rga24 rga24 May 2014 Hardware
  • On 48k, can I copy 4k before next screen updateFollowing on from my thread at [url="http://www.worldofspectrum.org/forums/viewtopic.php?topic=6423&forum=11"]http://www.worldofspectrum.org/forums/v…

    ... time by something usefull than timing loop
    Fikee Fikee September 2004 Development
  • Determining 50hz/60hz in softwareHow can you determine in software if you are running at 50hz or 60hz?

    ... ,A
    HALT ; sync timing
    LOOP JR LOOP
    BACK LD A ...
    Dr BEEP Dr BEEP March 2006 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…

    ... testing code which does a timing loop... don't have anything (like ...
    icabod icabod May 2007 Development
  • ZX Spectrum (16K) sound/beepHi all, I think I'm in right place now, I've tried to find an answer how to generate two channel sound using ZX Spectrum 16K. Only think I've found …

    ... the speaker, combined with a timing loop of sufficient accuracy to hit ... ROM, there's only one loop counter, for a single ... labl3: DEC E ; Volume control loop.
    JP NZ,labl5 ; Only ... ; If BC is not zero loop again.
    RET ; return ...
    Matt_B Matt_B November 2008 Sinclair Basic
  • ZX Spectrum (16K) sound/beepHi all, I think I'm in right place now, I've tried to find an answer how to generate two channel sound using ZX Spectrum 16K. Only think I've found …

    ... , just need beeper routine and timing loop for two channels, let's ...
    jp44 jp44 November 2008 Sinclair Basic
  • FMV on +3eOK, so about 6 months ago i posted here that i got full motion video on +3e, with a bunch of scr files called passion. I added the glider rider music…

    ...
    OUT (49149),A
    timing loop
    LD A,(HL)
    OUT (49149),A
    timing loop
    INC HL and jump ...
    nuggetreggae nuggetreggae April 2010 Development
  • Mistake in the 128K technical FAQ?[url]http://www.worldofspectrum.org/faq/reference/128kreference.htm[/url] [quote]Memory banks 1,3,5 and 7 are contended.[/quote] Really? I thought i…

    ... this code fragment:
    [CODE]loop ld (hl), a ; 7 T ... bc ; 6 T
    jr loop ; 12 T

    ; ... stack in advance: first the timing loop, then (20ms later) the post ... a, (hl)[/b] in the timing loop, rather than [b]ld (hl ...
    ajmoss ajmoss April 2010 Hardware
  • Sorting an array...Hi Folks, Over the weekend I had a play with sorting algorithms - takes me back to my student days! :-o My first try was with the good old Bubble S…

    ... was correct. It runs the timing loop twice, once with the USR ... time. Unfortunately using FRAMES for timing isn't precise enough, as ... go about getting an accurate timing for this, or for the ...
    Battle Bunny Battle Bunny September 2010 Sinclair Basic
  • Oscilloscope Speccy ProgramHi all, I remember very well in the old days when my Speccy was my single computer (around 1992) that I have had an oscilloscope software. This uses…

    ... , disabling IRQs while in a timing loop is essential in order to ... have a more constant loop time.

    HTH,
    Marcelo Marcelo December 2010 Sinclair Miscellaneous
  • Z80 DOS Sorry this computer is too fast!I?ve tried the free Z80 Emulator v4.00 (DOS Version) downloaded from Gerton Lunters Homepage on my Intel Core2 Quad Q60 running at 2,40 GHz an it ju…

    ... an overflow in the CPU timing loop.

    I'm not ...
    kphair kphair September 2011 Emulators
  • SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…

    ... /> jr z, sound_4 ; loop if so
    call check_end ... /> ld ix, be_ix_plus_3 ; base loop
    add ix, bc ; ... /> be_h_and_l_lp:
    dec c ; timing loop
    jr nz, be_h_and_l_lp ; ... br /> ld c, 63 ; timing constant
    jp nz, ...
    chev chev October 2013 Development
  • SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…

    ... br /> sa_leader:
    djnz sa_leader ; timing loop
    out (ula), a ; write ... br /> sa_sync_1:
    djnz sa_sync_1 ; timing loop
    out (ula), a ; write ... br /> sa_sync_2:
    djnz sa_sync_2 ; timing loop
    out (ula), a ; ...
    chev chev October 2013 Development
  • Help needed with MIA software with custom (?) loaderHi, I've got into my hands recently a bunch of Polish educational software which are unknown MIA on WOS. I believe they are protected with some…

    ... ;
    S6: 0xEAAE DJNZ EAAE ; Timing loop
    0xEAB0 JR NC,EAB6 ... ROM)
    0xEAB4 DJNZ EAB4 ; Timing loop
    0xEAB6 OUT (FE),A ... B,3B ; Tail timing
    0xEAD7 DJNZ EAD7 ; Timing loop for tail
    lfaria lfaria August 2016 MIA/STP/SDP
  • Super Wonder Boy antimultiface[url="http://bizzley.com/"]Bob Pape's book[/url] mentioned that Rob Hylands put Multiface protection in Super Wonder Boy. The program can detect whe…

    ... 're in a very tight timing loop and expecting an end-of ...
    i love the z80s i love the z80s May 2017 Development
  • Super Wonder Boy antimultiface[url="http://bizzley.com/"]Bob Pape's book[/url] mentioned that Rob Hylands put Multiface protection in Super Wonder Boy. The program can detect whe…

    ... 're in a very tight timing loop and expecting an end-of ...
    Hikaru Hikaru May 2017 Development
  • Most accurate timingWhich emulator is closest in timing to an actual (48k) spectrum? A count to 10,000 loop, printing the loop number each time on screen - same snapsho…

    Which emulator is closest in timing to an actual (48k) spectrum?< ... count to 10,000 loop, printing the loop number each time on ... />
    Hmm.
    Getting accurate timing for sound is going to ...
    Gedlion Gedlion June 2012 Emulators
  • Random Numbers, USR Return Values & Timing BASICI've been trying out Jon Ritman's random number routine, published in Your Sinclair Aug'87. Apart from a timing comparison I also did a frequency ana…

    ... 87. Apart from a timing comparison I also did ... after deducting the test loop processing overhead, RND took ... /> Here's the BASIC timing routine which I use. The ... line 9994. The first timing should be done with ... to get the loop overhead. The timing for that is ...
    Battle Bunny Battle Bunny January 2017 Sinclair Basic
  • TimingHey All, Is their away of obtaining timing information on ZX128k other than addresses 23672->23674. Basically I would like to identify every 100th …

    ... /> Is their away of obtaining timing information on ZX128k other than ...
    GBNvK GBNvK January 2004 Development
  • Game loop design?Having some thoughts on how to design the game loop and could do with some hints and tips from folks who have done it before! It's all about how to …

    ... br />
    [code]
    loop:
    call spritemove

    The above loop design means that the loop is synchronized with ... demands that every game loop is about the same length ... Ideas on the main game loop, interrupt synchronization and whether ...
    ekoman ekoman July 2004 Development
  • DEC BC/LD A,B/OR C/JP NZ,loopyesterday i saw nice trick:[code] dec bc ld a, b or c jp nz, loop can be replaced (bc starts >255, short jump) by: dec bc inc b djnz loop [/code] …

    yesterday i saw nice trick:[code]

    dec bc
    ld a, b
    or c
    jp nz, loop

    can be replaced (bc starts >255, short jump) by:

    dec bc
    inc b
    djnz loop
    [/code]
    ..nice
    Fikee Fikee February 2005 Development
  • TZX Loop 0The original Road Blasters TZX has a decryption tone loop with a counter of zero. I'm coding TZX handling in my emulator and I'm wondering the best w…

    ... TZX has a decryption tone loop with a counter of ... br />
    If this means loop 65536 times then the tone ... !
    If it means loop 0 times then why does ... the loop and blocks exist?
    ... If it means loop only once then why have ...
    Unique Unique March 2005 Emulators
  • Do these games loop forever?Hi chaps :) Right, after what... n=n+1 years of not getting to the switch on Firefly, I decided to have a go at it last night and with judicious use…

    ... you do, anyway, does Firefly loop forever after that? Or does ... />
    Also, does Shockway Rider loop forever, or is there an ...
    Vertigo Vertigo November 2005 Games
  • Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…

    ... , as well as correct any timing information stated above. I would ...
    Patrik Rak Patrik Rak September 2007 Emulators
  • Pentagon floating bus timingI wanted to take a little break from working on the ZXDS UI yesterday, so I added support for Pentagon timing instead, so I can finally enjoy the lik…

    ... I added support for Pentagon timing instead, so I can finally ... the floating bus behavior and timing. An explanation how the ULA ...
    Patrik Rak Patrik Rak November 2007 Emulators
  • Reggie Watts (?his loop machine?)So ... just wondering what the name/type of that green loop machine he always uses is. Enjoying his muzak so far ...

    So ... just wondering what the name/type of that green loop machine he always uses is.

    Enjoying his muzak so far ...
    ZnorXman ZnorXman April 2009 Chit chat
  • Rainbow Generator for 48K Spectrum using PUSHThis is what I came up with from [B]gasman[/B]'s suggestions. It's stable in ZXSpin and ZX32 simulating a 48K Speccy. Anyone like to try it on the …

    ... per loop, 7 loops per 224t line

    nop ;Timing adjustment ...
    push af
    nop ;Timing adjustment tweaks
    nop
    joefish joefish May 2009 Development
  • 48k Timing Tests...Here's v1 of the timing tests for the 48k Spectrum, with a little background [IMG]http://www.zxspectrum4.net/images/timing_test_v1.jpg[/IMG] [URL="…

    Here's v1 of the timing tests for the 48k Spectrum, ...
    Richard_Butler Richard_Butler April 2010 Development
  • Why doesn't my loop work?Can anyone help me understand why my loop doesn't work? Is it to do with how DEC HL affects the flags? [code] ; Read 32k bytes from port 191 as fa…

    ... help me understand why my loop doesn't work?
    Is ... ; Destination start address

    loop: IN A,(C)
    LD ... /> DEC HL
    JR NZ,loop

    RET
    [/code ...
    trellis trellis December 2010 Development
<1234567…34>

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  • TimingHey All,<br /> <br /> Is their away of obtaining timing information on ZX128k other than addresses 23672-&gt;23674. Basically I would like to identi…
  • Game loop design?Having some thoughts on how to design the game loop and could do with some hints and tips from folks who have done it before!<br /> <br /> It's all a…
  • DEC BC/LD A,B/OR C/JP NZ,loopyesterday i saw nice trick:[code]<br /> <br /> dec bc<br /> ld a, b<br /> or c<br /> jp nz, loop<br /> <br /> can be replaced (bc starts &gt;255, sho…
  • TZX Loop 0The original Road Blasters TZX has a decryption tone loop with a counter of zero. I'm coding TZX handling in my emulator and I'm wondering the best w…
  • Do these games loop forever?Hi chaps :)<br /> <br /> Right, after what... n=n+1 years of not getting to the switch on Firefly, I decided to have a go at it last night and with j…
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