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<1234567…34>
  • z80 less than and greater thanI am writing a keyboard routine where the pressed key code number is held in A. I only want to action the number key presses 1 to 9 (codes 49-57) so …

    ... 49 to check for less than
    cp a,49 ... set if the number was greater than A
    Neither the ... is set if A was greater than the number compared
    ... ,loop ?

    The greater than I think will be:
    greater than A so I do ...
    Speccy_James Speccy_James February 2014 Development
  • Collision DetectionHi everyone, This is my first post on WOS. Like most people here I owned a Spectrum when a teenager. At that time I was quite heavily into programmin…

    ... (HL),0 ;Reset Collision Detection Flags

    LD A,(IX ...
    RET NC ;return if greater than right coord
    SET 0 ...
    dmsmith dmsmith August 2004 Development
  • New Compo IdeaI've had this idea and would like to know what do you think about it. I think that most of us here know how to code in BASIC. The problem with Specc…

    ... you typing any further than when the buzz sounded.
    than the quieter click normally given ... . Values high than 130 tend to noticeably slow ... This system variable contains various flags controlling the Basic system and ...
    na_th_an na_th_an April 2005 Development
  • PZX file format draft[QUOTE=Andrew Barker;186084]To this date, there is no rival format for TZX, despite people saying they can do better. Well the challenge is on, prov…

    ...
    - encoding of pulses longer than 65535 T cycles is suboptimal ... imply its value is indeed greater than 65535, though.

    ... someone uses an opposite polarity than usual.

    To ... pause duration
    4 u8 flags - bit 0 specifies level ...
    Patrik Rak Patrik Rak May 2007 Emulators
  • Using INPUT without clearing last two lines of screen?I'm trying to print to the 22nd row of the screen using the ol' print #0 trick. Unfortunately, I require user INPUT which seems to wipe out the botto…

    ... the BC register pair is greater than zero, the 'jr' instruction will ... what it does to the flags. When doing assembly language, you ... the instruction does to the flags, not just to the register ...
    Winston Winston January 2009 Sinclair Basic
  • IF and control flow in machine codeHi everyone, Basic has a nice control flow like if statements. How can these be done in machine code since i cant find anything thanks

    ... that are equivalent to 'less than' and 'greater than' too.

    ... A register and set various flags according to the result (i ... 'Zero' (Z) and 'Carry' (C) flags are most relevant.
    If ... know which instructions set these flags on their own, and which ...
    joefish joefish September 2010 Development
  • Games in machine codeHi everyone, How do go about doing multiple shots like a machine gun, do you have to store every x and y position of each bullet? When you kill som…

    ... following parameters:

    Mode flags (1 = active / 2 = alive ... paramaters:

    scroll flags (1 = track player one / ... result is negative and greater than the display window dimensions ... position, direction volocity and flags. This step would be ...
    ASM ASM October 2010 Development
  • designing a computerHi everyone! I am designing a 4 bit computer and i need some advice, is this a good instruction set? [CODE] BINARY OPCODE DESCRIPTION 00000 nop…

    ... and then sets the condition flags
    0011 AND - AND logic ...

    There are two flags, Z and NZ, zero and ... still add three more flags, less than, equal and greater than

    The ... top and it has more than 6 different 7 seg displays ...
    Robin Robin October 2010 Chit chat
  • writing an emulator-newbie needs helpHi, this is my first post here. I decided to write a minimalistic emulator of ZX Spectrum-no emulation of advanced peripherals, no emulation of sound…

    ... their sum can never be greater than 1. That's how I ... understand why it affects the flags the way manuals say. The ... of confusing typos, but more than once Young's document says ... different about behaviour of some flags than other documents which makes me ...
    PeterP PeterP June 2011 Emulators
  • writing an emulator-newbie needs helpHi, this is my first post here. I decided to write a minimalistic emulator of ZX Spectrum-no emulation of advanced peripherals, no emulation of sound…

    ... =gasman;543986]No - the flags act as if you're ... internally and cleverly munging the flags, but if so, that ... the carry and half-carry flags on a subtraction are ... it each time a greater value is subtracted from ... either 0 or 1) was greater than 1, we got a carry ...
    PeterP PeterP June 2011 Emulators
  • Using CP and JR Z commandI have been trying to [URL="http://www.worldofspectrum.org/forums/showthread.php?t=40011"]convert a BASIC routine to machine code[/URL], but to no av…

    ... /> jr c - less than
    jr nc - equal or greater than

    flags are set. For example, A ...
    Shiru Shiru July 2012 Development
  • A quick newbish questionI'm reading through 'mastering machine code on your spectrum',as kindly posted by Mr bert on this forum. Correct me if I'm wrong from what i read,bu…

    ... the sum becomes greater than 255? Well, anything that is greater than that will ... , so if the sum was greater than or equal to 256, it ... "
    (there are also other flags, but that's not important ...
    Timmy Timmy March 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…

    ... /> jr c, report_bd ; error if greater than 255
    jr nz, report_bd ... channel
    call chan_flag ; restore flags
    .ifdef ROM1
    ex ... curchl
    call chan_flag ; restore flags
    jp stk_pntrs ; exit and ...
    chev chev October 2013 Development
  • IF EXIST?In MS-DOS scripting, there is an IF EXIST command that lets you check wether a file exists in disk or not. There are any way to check it out from BA…

    ... contain the first matching filename greater
    than the preloaded entry (if ...
    The_Bert The_Bert October 2013 Sinclair Basic
  • 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…

    ... character
    ld a, (flags) ; variable type to A
    ld a, (flags) ; flags to A
    and % ... co_temp_3:
    cp tk_pen ; lower than PEN?
    ret c ; ... br /> cp tk_over + 1 ; greater than OVER?
    ccf ; set ...
    chev chev October 2013 Development
  • "ZX80 Brain" RPN CalculatorIt is at times like [url=https://www.worldofspectrum.org/forums/discussion/54176/depression]when threads such as this are posted[/url] that I get the…

    ... and ACS for values greater than +1 or less than -1
    = ... effect on any keys other than these six
    - a ... ;
    - angle measurements other than radians (degrees, mils, grads... whatever ... tried, and setting the correct flags, trying to read the ...
    The Mighty Dopethrone The Mighty Dopethrone March 2017 Sinclair Basic
  • Loading Schemes > 1-bit per 2 edgesHi Guys, I'm just having another look at loading schemes again (a subject that interests me). Does anyone know if there any loading schemes t…

    ... value stored in B is greater than the timing constant, the pulse ... was missing.
    I thought flags it would come down to ... flags but just couldn't "see" ...
    BloodBaz BloodBaz August 2019 Games
  • Dan Dare 256 colour project many may not be aware of.I still need/want to try Vladimir's emulator. But I think many people here aren't aware of another 256 colour project, which was mentioned on C.S.S. …

    I still need/want to try Vladimir's emulator. But I think many people here aren't aware of another 256 colour project, which was mentioned on C.S.S. a while back. I don't think the author went particularly out of his way to make it known. The thread on C.S ...
    Sadako Sadako March 2004 Emulators
  • Collision DetectionHi everyone, This is my first post on WOS. Like most people here I owned a Spectrum when a teenager. At that time I was quite heavily into programmin…

    ... anyone offer any help with greater-than / less-than / greater-or-equal-to type ...
    dmsmith dmsmith July 2004 Development
  • For The Attention of Andrew BarkerAndrew,I have gone away and thought about the last weeks events and have come to a decision and it must be you that i talk too about what i intend to…

    ... gaining a little respect other than the disdain that is now ... need for preservation is far greater than petty squabbling"
    I am ...
    The Master The Master December 2004 MIA/STP/SDP
  • Can anyone help?Got a bit of a recurrent problem here when it comes to duplicating the Cronosoft tapes, i was wondering if anyone can help. I'm getting loads of ret…

    ... few bytes of programs saved greater than 16K. The recording made is ...
    chaosmongers chaosmongers January 2005 Sinclair Miscellaneous
  • Snacks while playing?There were few pleasures in life greater than a family-size pack of salt & vinegar Walkers crisps and some Irn-bru flavour Sodastream, while playing…

    ... were few pleasures in life greater than a family-size pack of ...
    udgoverload udgoverload August 2005 Sinclair Miscellaneous
  • Money money moneyI am now debt-free. Until I buy a house, anyway. Bloody hell. Before I go and see some sort of financial advisor, can anyone give me any inspiratio…

    ... money and get a return greater than 5 to 7%?
    NickH NickH April 2006 Chit chat
  • RFC: 64 column font codeIn BASIC, type CLEAR 49999 then import the code at 50000. Then type RANDOMIZE USR 50000. This will create a new channel and attach stream #4 to it. A…

    ... ; restore character
    cp $18 ; greater than 23?
    jr nc,err_b ... ; restore character
    cp $40 ; greater than 63?
    jr nc,err_b ...
    chev chev January 2007 Development
  • Harrier Attack II Help!Hi, We are making this game, Harrier Attack II, at Durell and are at last in the final testing stages. We now need about half a dozen serious tester…

    ... 2000 or XP, of speed greater than 1GHz, with a 3D graphics ...
    Mike R Mike R May 2007 Games
  • Does anyone else find Dan Brown suspect?Don't get me wrong, he's a good entertaining [i]fiction[/i] writer -- as long as the emphasis is on "fiction"; unfortunately, he has the annoying hab…

    ... , but the average was significantly greater than phi); and the figure in ... on Teabing's part, rather than Brown's.) And Alexander Pope ...
    robert@fm robert@fm May 2007 Chit chat
  • Elite Commander Editors / CreatorsI've noticed 3 of these in the WOS database. One is MIA and the other two have bugs I've discovered and don't edit everything. So, I was going to ma…

    ... if cargo bay size is greater than 20

    49 - ECM ...
    mulder mulder March 2008 Games
  • Inflatlation at 4.4%Inflation at 4.4% and still our government seem to do nothing. Given that the governments target inflation was 2% WFT??? Everyone is taking the pi…

    ... , even though their raises are greater than the extra costs that oil ...
    Scottie_uk Scottie_uk August 2008 Chit chat
  • z88dk Help neededI'm starting my tests with z88dk from a very simple example from a tutorial in speccy.org. It works fine but when I make the smallest modification t…

    ... sprite heigth and width are greater than 8 pixels

    Here ...
    Emlyn_Hughes Emlyn_Hughes January 2009 Development
  • Jumping to BASIC after importing 23296,1703Sorry for the confusing title. :-D Now that I've learned how to stop a game from starting after loading (in Fuse and Specemu), I have a few more que…

    ... import them to any address greater than 24999 if I wanted to ...
    zxbruno zxbruno May 2009 Sinclair Miscellaneous
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Related Threads

  • z80 less than and greater thanI am writing a keyboard routine where the pressed key code number is held in A. I only want to action the number key presses 1 to 9 (codes 49-57) so …
  • Games that are more fun than they should beI've just been playing Gnasher, my fave pacman clone on the speccy. And it occurred to me, that i could easily play the arcade original pac-man on ma…
  • Better late than never: the answers and results of the Quiz to end all Quizzes!First of all I would ask to excuse myself with those who have been waiting for the answers. But, besides work, study, etc., I had problems in verifyi…
  • Sequels that were better than the firstFOllowing on from disapointing sequels, how about sequels that were better than the first..<br /> <br /> I nominate:<br /> Teenage Mutant Hero Turtle…
  • Conversions better than the originalRenegade was way better than the arcade version. Better sound, better graphics and better playability. Just load up Renegade in Mame. Any other conve…
  • Best games to play on a real speccy rather than emulator?What would be the best games to play on a real 128k speccy rather than on emulation?<br /> <br /> I have just been playing R-TYPE on my +2 which was …
  • Rarer game than bubbler?I had, many moons ago, a version of spitfire 40 that didn't clock up hours of flying time, only minutes.<br /> <br /> I now have a version that disp…
  • Emulator is better than a real thing?I transffered DigiSID TAPe from [url="http://www.speccy.cz/"]http://www.speccy.cz/[/url] to my really ZX Spectrum 128K +2 (in 128 mode) and the demo …
  • which games in +3 disk version have more data than equivalent tape version ?I know only two differences:<br /> - Shadow of the Beast +3 disk version has a few static graphics on main menu and between levels<br /> - Thunder Bl…
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