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  • Amiga MOD on ZX SpectrumWell, there were several question about music matters on WOS lats times, so I decided to describe some of my 'adventures', heheh, with MOD playing on…

    ... need a 2*296=592 byte period table, assuming 2 bytes ... thing we've been tossing back and forth.

    Here ... /> You'd construct a 592-byte table using this formula, and ...
    Alcoholics Anonymous Alcoholics Anonymous April 2004 Sinclair Miscellaneous
  • InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…

    ... tstates: write the modified value back to (HL).

    ... /> * M4: 3 tstates: read low byte from the interrupt vector.
    * M5: 3 tstates: read high byte and jump to interrupt routine ... /> * M2: 3 tstates: write high byte and decrement SP.
    * M3 ...
    Fraser Fraser July 2004 Development
  • 2 questions regarding partial port decoding1) What happens if the Spectrum reads from a port whose number matches the criteria for more than one device ? Does only one of the devices get to r…

    ... get to receive/send the byte or do all do so ... resistors. Peripherals hanging off the back are connected on the Z80 ...
    Alcoholics Anonymous Alcoholics Anonymous August 2004 Development
  • Pixel setting / general speccy codingi just started doing some cross-coding with the [url="http://www.bigfatpanda.fsnet.co.uk/z80.html"]Z80 SNA assembler[/url] and an emulator, and this …

    ...
    LD (HL),A ; put back on screen
    RET
    byte table.
    Dr BEEP Dr BEEP August 2004 Development
  • New vault updateWell, it's interesting to see how totally underwhelmed most people are about the new update! Or are they still busy downloading everything ;) The on…

    ... I recall correctly; by one byte. And left it up to ... my own old collection from back in the day I haven ...
    Sadako Sadako August 2004 MIA/STP/SDP
  • need help with speed optimization. this procedure draws a sprite with mask from memory onto the screen with x-coordinate in pixels. it doesn't shift sprites in realtime, it just uses …

    ... form:
    ;mask byte, sprite byte, mask byte, sprite byte... and so on.)
    LD (DE),A ;put it back on the screen
    INC ... mask
    DEC H ;move back to left side

    back to beginning to
    LD ...
    dmsmith dmsmith August 2004 Development
  • Interrupts details questionSuppose I am writing a game and I want to use interrupts to measure time, draw the screen without flicker, maybe to poll keyboard etc. What kinds of …

    ... br /> ;***************************************************************************
    .org 0
    .byte ;I register, points to rom ... call label2addr(unscrambleHL) ; return back to normal format
    ld ... )
    ; put it back into the variable
    ...
    Erlstoned Erlstoned August 2004 Development
  • Anyone know the address mappings...of the hardware resources on the speccy; From the screen display address range to all the hardware control registers. etc. Where can I get access t…

    ... - 64029 etc.

    First Byte is used as a flag ... BC
    DJNZ CDLOOP ;Loop back and check again

    dmsmith dmsmith September 2004 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…

    ... - 64029 etc.

    First Byte is used as a flag ... BC
    DJNZ CDLOOP ;Loop back and check again

    dmsmith dmsmith September 2004 Development
  • I would like to write emulatorHi guys, I'm new to this forum but I realise that you must get loads of posts from people asking "how do I write an emulator" so I'll try and be spe…

    ... , loop:

    Get the byte at the memory location pointed ... to keep incrementing for every byte you grab in the previous ... right address, otherwise just loop back round.

    You need ...
    Dunny Dunny September 2004 Development
  • I would like to write emulatorHi guys, I'm new to this forum but I realise that you must get loads of posts from people asking "how do I write an emulator" so I'll try and be spe…

    ... />
    Start:
    |
    Fetch byte at PC
    |
    Call ... /> | | Call Update_Display
    |--------------
    |
    Back to start


    Dunny Dunny September 2004 Development
  • 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…

    ... , I basically want to copy back to front screen with no ... a 12.5 T per byte copy, albeit 14 bytes per ... . This order crosses the raster back and forth and you see ... ula drawing borders before the byte at 16384 gets drawn on ...
    Alcoholics Anonymous Alcoholics Anonymous September 2004 Development
  • Smooth Screen ScrollingHi Everyone, Any suggestions on what is the best way to do horizontal scrolling ie. in Zynaps fashion. I am working on a routine at the moment, whi…

    ... say we have a back screen of 256x128 pixels ... or c ; merge with low byte.
    jp nz,scrol0 ; ... zero yet, then jump back to the start of ... br /> scrol0 rl (hl) ; scroll byte left.
    dec hl ; next ...
    jonathan jonathan September 2004 Development
  • Programming Sound EffectsHi guys, Have decided, probably due in some way to my midlife crisis, to tart up and re-release (or even just re-lease) the old 48K Speccy games I w…

    ... that. or does it drop back?
    [/quote]

    The ... you use 90 bits=10 byte+2bit for 6.5?
    Alcoholics Anonymous Alcoholics Anonymous October 2004 Development
  • How to transfer Tapes to Microcartridges??Hello All, I have a ton of Microcartridges, also about 10 totally unused, was wondering how I can transfer any games I have on tape to Microcartridg…

    ... with any particular game ask back here.

    Some Games ... Variables let alone a 512 byte buffer.

    Good Luck ...
    Geoff Geoff October 2004 Sinclair Miscellaneous
  • Announce: EmuZWin 2.5 Release 2.2 Post-FinalEmuZWin Version 2.5 Release 2.2 post-FINAL (16-Oct-2004): [-] A small pause added between TAP blocks while loading tape from .TAP image (otherwise s…

    ... no way to bring it back to normal. All the bytes ... sense anymore.Aother time every byte disappeared and the screen got ...
    Arm73 Arm73 November 2004 Emulators
  • Announce: EmuZWin 2.5 Release 2.2 Post-FinalEmuZWin Version 2.5 Release 2.2 post-FINAL (16-Oct-2004): [-] A small pause added between TAP blocks while loading tape from .TAP image (otherwise s…

    ... used to paint every single byte in the GFX Editor of ... I always want to go back and give it a final ...
    Arm73 Arm73 November 2004 Emulators
  • Compressed Loading ScreensHi everybody From my speccy memories I could swear I could remember games with loading screens that took less than normal time to load. But up until…

    ... repeated sequences of the same byte.

    For example, if ...
    Philip Kendall Philip Kendall November 2004 Sinclair Miscellaneous
  • There's a bug in my Speccy, Dear Liza, Dear Liza...Hi guys, Just me being annoying again - Can anyone out there in 'Internetland' help me with ideas about what could be causing a bug in my Speccy em…

    ... some BASin stuff a while back but ran away from it ... if I get my enthusiasm back.

    Also have just ... it is falling over at byte 'displacement' type instructions, but it ... lame, take it out the back garden and put it out ...
    Speculator Speculator December 2004 Development
  • Phantom ClubHello. Well, finishing my little concerns about some games on my first day on the forum, I have to ask about this one. I really liked it and spent ma…

    ... quite a number for Bug-Byte and Imagine (Ocean). I never ... bit too bizzare for me back in the days) but Movie ...
    Tom-Cat Tom-Cat January 2005 Games
  • new release of winTZXHi all I released winTZX 0.4drc1 (04/02/2005) + Added CSW file support + Added block selection (replay and save) + Added reverse output + Added direc…

    The encoding application length byte is too big by 2 ... . Can you make the flags byte 1 so that the first ... signal doesn't quite go back to the zero line.
    Fraser Fraser January 2005 Emulators
  • So what was the first ever Spectrum game?..does anybody know? Equally interesting is what the second, third and so on was, would be nice with a timeline of the first few releases for histori…

    ... that Spectral Invaders from Bug Byte was the first commercially released ... two companies were home-grown back then since Spectral Invaders is ...
    Frankie Frankie January 2005 Games
  • Who the fcuk is Paul McKenna??Disappointing development: [url="http://www.worldofspectrum.org/showwrap.cgi?permit=houses/McKennaPaul.pmt"]http://www.worldofspectrum.org/showwrap.…

    ... were based in refurbished Bug-Byte offices (with a nice river ... colourful game specs through. Thinking back ten years, I'm surprised ...
    rich_chandler rich_chandler February 2005 Games
  • Games that cannot be completed due to bugs - the definitive listIt would be nice if the community of WoS compiled a list of all the games that are known to be impossible to complete due to bugs. Perhaps one day, a…

    ... ,14,20
    21 Bog Byte! 20,53,21,29
    back at 'The Hoard'
    otherwise ...
    Mr. Anonymous Mr. Anonymous March 2005 Games
  • 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…

    ... the same again to get back to normal L/C mode ...
    na_th_an na_th_an April 2005 Development
  • Cool BASIC tricks and tips!Following on from Dunny's excellent suggestion of a compendium of BASIC tips + tricks, I believe it would be better to have a topic dedicated to it. …

    ... converts it to the two-byte control codes we all know ... 't code in z80 assembly back then.

    When I ...
    Dunny Dunny April 2005 Sinclair Basic
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