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Search Again :: Adv Search 1000 results in 0.004s
<1234567…34>
  • Is the IY register used by the spectrum rom?Hi I've been writing a sprite routine and have noticed that the sprite data gets corrupted at some points. I have no idea why and can only guess tha…

    ... the problem. Does the IY register need to hold a certain ...
    dmsmith dmsmith November 2004 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 …

    ... the progress of the R register. At one point I reset ... contended RAM on the R-register? I do not run any ... no effect as the R-register is internal to the Z80 ... (Pentagon, Scorpion, ...) affect the R-register differently? Again I would guess ...
    icabod icabod July 2006 Development
  • which domain to register?I'm about to register a domain under my country's top domain. almost all of the keywords are available to buy and I'm a bit indecisive person. which…

    I'm about to register a domain under my country' ...
    Arda Arda November 2006 Chit chat
  • IY RegisterIve got a really bizarre bug, and I have only just started using the IY register. I seem to remember reading somewhere in a programming book, to neve…

    ... just started using the IY register. I seem to remember reading ... , to never use the IY register. Am I dreaming this?
    register (HL, DE, BC) for zero ...
    carlinski carlinski September 2007 Development
  • The R RegisterI've found some documentation regarding the R register (in that it is updated every M cycle except for a certain number of opcodes in which it is upd…

    ... some documentation regarding the R register (in that it is updated ... maximum value of the R register is +127? If so, do ...
    MadDoc MadDoc June 2008 Emulators
  • The F register unused bitsI'm doing some reading and trying to organize my Spectrum ML apprenticeship and while looking in greater detail at the flag register one question pop…

    ... greater detail at the flag register one question popped.

    Can I manipulate this register directly or make use of ...
    rahtgaz rahtgaz January 2009 Development
  • Rotating Register PairsWhat's the best way to rotate left (or right) a register pair, so that (eg.) FE76 becomes E76F (or 6FE7)? I presume that passing the intermediate bit…

    ... rotate left (or right) a register pair, so that (eg.) FE76 ...
    Battle Bunny Battle Bunny October 2010 Development
  • A clever method of using a single 8-bit register to be used for two things at a timeI don't know if this is the way the SAVE routine in the Spectrum works. Anyway, this is what I've learned today. I've been commented the disassembly…

    ... : I didn't found a register that holds 8, and in ... is: a single 8-bit register (L) holds both the byte ... left to transfer, the L register is not 0.
    So ...
    mcleod_ideafix mcleod_ideafix January 2011 Development
  • Canny use of the 'r' register?Seeing Sokurah's code in the [URL="http://www.worldofspectrum.org/forums/showthread.php?p=583188#post583188"]crunch sound thread[/URL] has made me th…

    ... me think about the r register.

    I've used ... crafty uses for the r register?
    R-Tape R-Tape November 2011 Development
  • SpecBAS article in The Register todayDunny's SpecBAS (for the Raspberry Pi) got a write-up in The Register today: [url]http://www.theregister.co.uk/2012/11/13/sinclair_basic_for_raspber…

    Dunny's SpecBAS (for the Raspberry Pi) got a write-up in The Register today:

    [url]http://www.theregister.co.uk/2012/11/13/sinclair_basic_for_raspberry_pi/[/url]
    Dave_C Dave_C November 2012 Sinclair Miscellaneous
  • Author of The Hobbit featured on The RegisterSpotted another ZX Spectrum-related on The Register today: an article featuring the personal history of Veronika Megler (yes, a woman), one of the pr…

    ... ZX Spectrum-related on The Register today: an article featuring the ...
    RetroTechie RetroTechie November 2012 Games
  • "The Register" logo.What do those walking legs in the "The Register" logo represent? Is there a story behind them and why is it missing the rest of the body? Where is …

    What do those walking legs in the "The Register" logo represent? Is there a story behind them and why is it missing the rest of the body? Where is it walking to?

    [img]http://www.theregister.co.uk/Design/graphics/std/logo_414_80.png[/img]
    ZnorXman ZnorXman April 2013 Chit chat
  • IX register - using/problemsAre there any rules on using the IX register? Are there any restrictions on the memory locations that it can access? Yes, I know it's slower than us…

    ... rules on using the IX register? Are there any restrictions on ...
    MatGubbins MatGubbins December 2013 Development
  • The I register and IM 1Hi al! I've been doing some coding, replacing the BASIC ROM with my own code and upon examination of a few 16Kb cartridges, all the ones I've look…

    ... to say about the I register, apart from its use in ...
    Mysterion Mysterion November 2015 Development
  • R registerI'm cross-posting this as a spin-off of a [url="http://www.worldofspectrum.org/forums/discussion/52748/zx-spectrum-cartridges/p2"]thread in "Hardware…

    ... & correctness of the R register behaviour.

    From ... br /> [quote]Memory Refresh (R) Register.

    The Z80 ... of this 8-bit register are automatically incremented after ... instruction fetch. Hence R register can be considered a simple ...
    RMartins RMartins June 2016 Emulators
  • Print (to screen) avalue held in a register pairHi guys, looking for a routine that will print any value from 0 to 65535 to the current position on the screen. I once heard that there was a PRIN…

    ... a value held in theBC register pair, to the current screen ...
    DEATH DEATH October 2016 Development
  • The HL Register Pair Naming. An Observation.This isn’t really a question or a tip. Just an observation about the naming convention of the registers in the Z80 CPU. It seems that every register …

    ... CPU. It seems that every register other than the HL pair ... [/b]—[b]F[/b]lag register
    [b]I[/b]—[b ... ]Y—[b]I[/b]ndex register [b]X[/b]/[b]Y ... /> Then come the good-old register pairs:

    [b]SP ...
    Ast_A_Moore Ast_A_Moore March 2017 Development
  • The I register pointing to $40–$7f causes ULA snow and a crash. Or does it?I have heard it from numerous sources, including a few members of this forum, that 128K/+2 machines crash if the I register points to a range of $40–…

    ... machines crash if the I register points to a range of ...
    Ast_A_Moore Ast_A_Moore February 2018 Development
  • Currah MicroSourceThis is an interesting one for the experts to mull over. I've got (and love) a MicroSource interface from Currah which consisted of an 8K ROM provid…

    ... gets paged when the PC register passes a particular ROM address ...
    Chris Chris August 2001 Emulators
  • Shadow of the UnicornI've written a program to run Shadow of the Unicorn on a +2A/+3. Is there anywhere it can be put to be available to anyone wanting to play the game?…

    ... instructions to set the flags register to 0. It works but ...
    Anonymous Anonymous December 2001 Games
  • Forever 2002 - crossplattform 8 bit party - the 3rd editionThe new year - a year of anniversaries for all 3 major 8 bit plattforms has started. ZX spectrum & C64 are 20 years old & Atari is celebrating 30 ani…

    ... [/url]. Don't forget to register in
    visitors&contributors ...
    Roman Roman January 2002 Sinclair Miscellaneous
  • Emulators and ROM'sHi - This is my first post here, although I have been visiting WoS for ages.... I have been on quite a few multi-platform sites that offer downloads …

    ... promised b)require you to register then still dont work properly ...
    LeeT LeeT April 2002 Wanted
  • Emulation and Debugging functionality[Cut n Paste from the original CSS post] Hi all, I'm currently working on SPIN's debugger, which is coming along nicely. Mostly, it's been devel…

    ... modifying registers/memory, logging
    register/pc activity etc) to run ...
    Dunny Dunny June 2002 Emulators
  • 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 …

    ... being held in the B register.
    Doesn't really matter ...
    Geoff Geoff July 2002 Sinclair Miscellaneous
  • is Z80 by G.A. Lunter still going?I was thinking of registering Z80 v4 but I'm not sure if it is still being developed? Has anybody suceeded in registering recently? There is a websit…

    ... for Chezron Software in the Register.doc that comes with the ...
    Crabfists Crabfists August 2002 Emulators
  • Forums Registration?Hi, I'd like to register here, but I keep getting a complaint message that I haven't filled in all required fields... I'm used to registering for fo…

    Hi, I'd like to register here, but I keep getting ...
    Anonymous Anonymous September 2002 Sinclair Miscellaneous
  • Help, Space-Time Productions's CNCS32.dll isn't working in w2000Hi, I know this is not a support forum, but as you were talking about remakes I decided to give it a try. However... (gosh! this looks like R Tape L…

    ... diskette.

    Trying to register the DLL with regsvr32 produces ...
    toninho-malvadeza toninho-malvadeza September 2002 Games
  • P'n'P Site NewsPeek 'n' Poke October 2002 Latest site news If you like this site, then why not head over to Peek 'n'Poke? It covers Atari 2600, Spectrum, C64 and …

    ... in the world!
    ? Forum - Register and join in the subjects ...
    LeeT LeeT October 2002 Announcements
  • Solution for overwritten stack in 48k SNA filesIt has been known for quite some time now that the 48k SNA file format has one serious fault, which is described in the file formats section on the W…

    ... a snapshot, so the PC register overwrites 2 bytes of data ...
    Anonymous Anonymous October 2002 Emulators
  • Spectrum vs Vic 20 - cast your vote (please!)As I mentioned earlier this week, the Spectrum goes head to head with the Commodore Vic 20 in this week's round of the Micro Mart 'computer world cup…

    ... top). You
    have to register with the forum to do ...
    woodcock88 woodcock88 January 2003 Sinclair Miscellaneous
<1234567…34>

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Related Threads

  • Index register questionDoes anyone know whether the DD / FD prefix works on the ex de,hl instruction, ie. modifying it to ex de,ix or ex de,iy.<br /> <br /> Derek
  • Index register subtractionHi,<br /> <br /> Just wondering if there a way to perform SBC HL,BC on the IX or IY registers. I can't find an op code for it, and my assembler doesn…
  • Is the IY register used by the spectrum rom?Hi<br /> <br /> I've been writing a sprite routine and have noticed that the sprite data gets corrupted at some points. I have no idea why and can on…
  • Z80 register decoding document error?Hi, <br /> <br /> I've been working on a disassembler using the following document written by Cristian Dinu (aka GOC?). <br /> <br /> [url="http://w…
  • R Register, Contended RAM and ClonesHi.<br /> 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 - …
  • which domain to register?I'm about to register a domain under my country's top domain. almost all of the keywords are available to buy and I'm a bit indecisive person.<br /> …
  • WoS article on The RegisterI dont know if anyones seen this article but I was quite angry at the tone of the piece.<br /> <br /> [url]http://www.theregister.co.uk/2003/03/07/ga…
  • IY RegisterIve got a really bizarre bug, and I have only just started using the IY register. I seem to remember reading somewhere in a programming book, to neve…
  • Easy Compare On 2 Byte Register?e.g. HL, BC, DE<br /> Has anybody got a really easy way of doing this without comparing each byte seperately? Any maths has no effect on the flags as…
  • Bit 3 And Bit 5 Of The Flag RegisterHi,<br /> <br /> I know that bits 3 and 5 are "undocumented" but does anyone know where I can find data on how they are handled? <br /> <br /> For in…

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