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  • z88dk vs. sdccI've just read this article (in Spanish) [url]http://www.cpcmania.com/index2.asp?urldest=Docs/Programming/SDCC_vs_z88dk_Comparando_tama%F1o_y_velocid…

    ... overhead in perhaps 60-70 cycles per library call and 5 ... saved 7 bytes and 50 cycles outside the function. Inside the ... 9 bytes and about 25 cycles.

    These little things ...
    Alcoholics Anonymous Alcoholics Anonymous May 2012 Development
  • ISO-Copy - Individual Software revisitedHi folks In another thread about Supertape: [url]http://www.worldofspectrum.org/forums/showthread.php?t=36203[/url] ... we touched on ISO-Copy by th…

    ... convert this value to Z80 cycles (as timings are expressed in ... compute timings from samples to cycles is a bad practice, generally ... the total sum of samples/cycles.

    But well, not ... samples, that is about 6508 cycles, 3254 for each pulse. Again ...
    jlsoler jlsoler June 2012 MIA/STP/SDP
  • yeah x 0.0.2first: [URL="http://www.yeah-unix.org/downloads/yeah_0.0.2.tar.gz"]the goods are at - http://www.yeah-unix.org/downloads/yeah_0.0.2.tar.gz[/URL] aft…

    ... (and don't waste CPU cycles).

    This is the ...
    tstih tstih June 2012 Development
  • New Game: BerksManLink: [url]http://www.worldofspectrum.org/infoseekid.cgi?id=0027713[/url] Originally written to demo Boriel's ZX Basic, and still needing most of th…

    ... I have the spare CPU cycles to make that tick nicely ...
    Gedlion Gedlion June 2012 Brand new software
  • DIY AY for 48k schematicHello! I can't seem to find a diy schematic for attaching AY to 48k so it gets 128k compatible sound. I see offers to sell ready made devices, but n…

    ... , but some of the contention cycles are too long for it ... some of the shorter contended cycles - but if there was too ... sync by the very few cycles before the next period of ...
    Winston Winston June 2012 Hardware
  • Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …

    ... /> PRCHAR defb 17 ; saving 10 cycles
    CHARS defw address ; Get ... /> INC L ; saving 2*7 cycles assuming chars on 8byte boundary ... screen saving 6+4+13 cycles not including the last inc ...
    Baggers Baggers June 2012 Development
  • Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …

    ... /> INC L ; saving 2*7 cycles assuming chars on 8byte boundary ... /> PRCHAR defb 17 ; saving 10 cycles
    CHARS defw address ; Get ...
    Einar Saukas Einar Saukas June 2012 Development
  • Anyone recommend a reliable cheap ink jet printer?Can anyone recommend to me a good inexpensive (less than ? 60) ink jet printer that isn't an Epson. I have a totally useless epson s20 that constantl…

    ... to do more head cleaning cycles by squirting ink through the ... wasted ink through head cleaning cycles gets dumped ink the ink ...
    Hercules Hercules July 2012 Chit chat
  • The Euro 2012 England supporter's threadCome on in, grab a beer and try not to get too depressed. Let's take the time to enjoy the Euros now, cos we won't be enjoying it once they start! :…

    ... more, these things go in cycles. It would not surprise me ...
    Vampyre Vampyre July 2012 Chit chat
  • Xor-shift random number generator for Z80[QUOTE=Patrik Rak;320244]Come on, people, [URL="http://www.jstatsoft.org/v08/i14/paper"]xor-shift generators[/URL] devised by Marsaglia, that's the w…

    ... tests, and takes only 126T cycles. That's quite unheard of ... z80bits page takes about 140T cycles but has a period of ...
    Patrik Rak Patrik Rak July 2012 Development
  • I am currently playing......Don't know if there's been a thread like this, but I can't find one.... Having seen all the different threads asking people if they've played such a…

    ... the lack of day/night cycles thoguh. I just noticed that ...
    Bermondsey Bob Bermondsey Bob July 2012 Chit chat
  • I am currently playing......Don't know if there's been a thread like this, but I can't find one.... Having seen all the different threads asking people if they've played such a…

    ... the lack of day/night cycles thoguh. I just noticed that ...
    GreenCard GreenCard July 2012 Chit chat
  • GUI/OS for the Spectrum?Hi, Is anybody working on a WIMP/GUI system for the Spec? Is there anything current out there? [url]http://snakeoillabs.com/wordpress/2005/10/30/8…

    ... logic has already spent CPU cycles. I wonder if a more ... /> This way I save drawing cycles but I also add some ...
    tstih tstih July 2012 Development
  • GUI/OS for the Spectrum?Hi, Is anybody working on a WIMP/GUI system for the Spec? Is there anything current out there? [url]http://snakeoillabs.com/wordpress/2005/10/30/8…

    ... logic has already spent CPU cycles. I wonder if a more ... /> This way I save drawing cycles but I also add some ...
    flashjazzcat flashjazzcat July 2012 Development
  • Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …

    ... A,N has the same cycles (7) as LD A,(BC ...
    antoniovillena antoniovillena July 2012 Development
  • T-States?Can anyone point me to any good reading (or summarise) that will explain exactly what a tstate is? At the moment for me, tstates are a useful gauge …

    ... , etc, are often call M-cycles. An M1 cycle, for example ... of a sequence of M-cycles but the length of time ... of T-states. The M-cycles themselves are what are of ...
    Alcoholics Anonymous Alcoholics Anonymous July 2012 Development
  • 64x48 full colour graphicsHow feasible is this? Could an interrupt-driven routine be used to, for example, fill the top two thirds with a 64x32 blocky picture and leave the bo…

    ... the HALT waits in 4T cycles, like a load of NOP ...
    joefish joefish July 2012 Development
  • Spectrum Emulator that supports low resolutions and runs smoothlyHello to All, I have been trying to find a spectrum emulator that will work well through my CRT TV (using RGB to Scart) Most emulators seem to supp…

    ... first output load is 13 cycles of CLK7 later than !Border ... high. The next 8 CLK7 cycles are the 8 bits being ...
    guesser guesser July 2012 Emulators
  • Spectrum Emulator that supports low resolutions and runs smoothlyHello to All, I have been trying to find a spectrum emulator that will work well through my CRT TV (using RGB to Scart) Most emulators seem to supp…

    ... border starts at 32 CLK7 cycles before !Border goes high but ...
    guesser guesser July 2012 Emulators
  • Add horizontal hardware scroll to ULA+In this case we must read a bit in the ULA+ for test if supported. And the future software that uses it must have to branch: 1. If hardware scroll i…

    ... horizontal scroll is delaying X cycles (for the 7Mhz clock) both ... signal will be shorter (248 cycles instead 256). X is the ...
    antoniovillena antoniovillena July 2012 Development
  • Spectrum Emulator that supports low resolutions and runs smoothlyHello to All, I have been trying to find a spectrum emulator that will work well through my CRT TV (using RGB to Scart) Most emulators seem to supp…

    ... clock. This occurs 8 CLK7 cycles after the !Border signal went ... -1[/I] occurs 13 CLK7 cycles after !Border went high meaning ... adding the same 8 CLK7 cycles. The data latch already holds ... high, finally completing 13 CLK7 cycles after !Border returned low. At ...
    guesser guesser August 2012 Emulators
  • The need of having a 257-byte table for IM2 routinesThis came from a discussion at the speccy.org forum. I have understood that the reason behind the 257-table for IM 2 routines is due to certain joys…

    ... your interrupt code during INTA cycles if and only if you ...
    mcleod_ideafix mcleod_ideafix August 2012 Development
  • Bug fixing woesGaahhhh! I've spent an afternoon off work agonizing over why my routine didn't work. It's something I'd already restarted so didn't want to wipe th…

    ... it was, went through several cycles of building, testing, move the ...
    Jonathan Harston Jonathan Harston August 2012 Development
  • The need of having a 257-byte table for IM2 routinesThis came from a discussion at the speccy.org forum. I have understood that the reason behind the 257-table for IM 2 routines is due to certain joys…

    ... unstable data bus during INTA cycles, or DividePlus issues. That would ...
    mcleod_ideafix mcleod_ideafix August 2012 Development
  • Sending key presses to the spectrumfor a project I want to send automated keyboard presses to the ZX via a micro-controller. Is it possible to send these through the expansion slot? …

    ... =10, max=24 cycles
    ;Max 33 cycles from start of interrupt ... +2+2+3+2=33 cycles!
    mov A,BackupAIntULA
    mcleod_ideafix mcleod_ideafix August 2012 Hardware
  • WibbleBibble's Basic threadHi in an attempt to keep my questions from spamming the forum. I think its better to put them all in one place. Thanks everyone so far, I feel I am …

    ... around then wait for REPDEL cycles.
    and repeat. The latter ...
    Battle Bunny Battle Bunny August 2012 Sinclair Basic
  • WibbleBibble's Basic threadHi in an attempt to keep my questions from spamming the forum. I think its better to put them all in one place. Thanks everyone so far, I feel I am …

    Thank you. I understand.:)

    That code snippet is going to get used all over the place. Very useful.

    Ok as this was supposed to be a 'Space docking simulation' (snigger snigger...)

    Lets set the background to something a ...
    WibbleBibble WibbleBibble August 2012 Sinclair Basic
  • WibbleBibble's Basic threadHi in an attempt to keep my questions from spamming the forum. I think its better to put them all in one place. Thanks everyone so far, I feel I am …

    ... reference. You could count 1000 cycles from FRAMES and then ask ...
    Battle Bunny Battle Bunny August 2012 Sinclair Basic
  • SPECTRA New from Paul FarrowLooks good! Read about it [URL="http://www.fruitcake.plus.com/Sinclair/Spectrum/Spectra/SpectraInterface.htm"]here[/URL]

    ... on and not enough clock cycles then things tended to go ...
    Winston Winston August 2012 Sinclair Miscellaneous
<1…24252627282930…34>

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