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<1…14151617181920…34>
  • Manic Miner - Different Tape InlaysSo why did bug byte have two different inlays for MM? [ This Message was edited by: mlasham on 2003-07-28 12:38 ]

    ... /> I'm really enjoying getting back into all this stuff.
    back good memories too. At the ... great - as did the Bug-Byte and Ultimate ones - but I ...
    mlasham mlasham July 2003 Games
  • Who want to remake Double Dragon?Seeing as the Speccy version was crap (see my review: [url="http://www.gamestyle.net/retro.php?article=31"]http://www.gamestyle.net/retro.php?article…

    ... . they get a mask byte and gfx byte then switch to screen ... screen then switch back and going to the next byte... switching is ...
    Fikee Fikee August 2003 Games
  • Anyone for a hacking challenge ?I have to get the DSK version of Tomahawk to work. It uses the well-known Digital Integration "SECURITY CODE" lock just like in Bobsled, ATF, etc. Th…

    ... ) let's have a trace back to see where it is ... our own.

    Scroll back a tad again and you ... A,D ; Take the high-byte
    E904 AND 03 ; The ...

    So trailing these back will show you how the ...
    BadBeard BadBeard August 2003 Sinclair Miscellaneous
  • Anyone for a hacking challenge ?I have to get the DSK version of Tomahawk to work. It uses the well-known Digital Integration "SECURITY CODE" lock just like in Bobsled, ATF, etc. Th…

    ... .

    Just back from the park with the ... my tea and then back 2 lenslok write up ... (40000),A ; Put it back! ie. Memory location 40000 now ... remember we enter the lo-byte first!). Keep pressing ENTER ... ; Put the number of lives back

    Return ...
    BadBeard BadBeard August 2003 Sinclair Miscellaneous
  • Anyone for a hacking challenge ?I have to get the DSK version of Tomahawk to work. It uses the well-known Digital Integration "SECURITY CODE" lock just like in Bobsled, ATF, etc. Th…

    ... 03 AND 03 ;the high-byte will now
    ;contain 0 ... ),HL ;and put the code back
    EA40 E1 POP HL ...
    BadBeard BadBeard August 2003 Sinclair Miscellaneous
  • 128 Memory PagingI'm having a problem getting my brain around paging. Well, actually the bit I don't understand is how reading I/O ports works! I hope the collective …

    Port 32765 is a write-only port.
    Normally the byte at 23388 holds the last value written to the port. Read that, alter your page bits and then write that back to 23388 and to the port.
    Woody Woody August 2003 Sinclair Basic
  • Sync-buzzer, interrupts and general confusionBeen wittering on about this in the Misc group, but thought it was best discussed here. Basically been trying to recreate the Sid-Sound effect from A…

    ... probably won't hear back until next year. Looks ... this is a single-byte RST instruction that performs ... points at a 256 byte table containing interrupt service ... not provide an identifier byte when it is supposed ... to 0xf100 inclusive. Every byte in this table is ...
    Alcoholics Anonymous Alcoholics Anonymous September 2003 Development
  • Jet Set Willy Problems...I THINK I've completed the "Lord of the Rings version of Jet Set Willy...I've reached the "Grey Haven" (or whatever it's called) but when I jumped ov…

    ... , it just looped
    > back to a yellow room 5 ... screens back. What
    > are you ... /> > game?

    Go back right from "The Field of ... file is a raw 6912-byte binary file), if the emulator ...
    andrewbroad andrewbroad September 2003 Games
  • ZX81 and ZX80 emulator on Spectrum 128KA couple of weeks ago we were talking about a new ZX81 emulator for the 128K. Someone beat me. More details at [url="http://www.fruitcake.plus.com/S…

    ... ;
    JR C,L0388 ; loop back with carry to TRAILER

    RET ; return with full byte.
    Tom-Cat Tom-Cat September 2003 Emulators
  • help in byte mirroring.I need some help. What is the best way to mirror the byte? (for ex. 10010011 -> 11001001) I mean, if there is a simple way to do it (may be with OR, …

    Java method to mirror a byte (from SPECSAISIE 1.3 - class ... />
    public static byte reverseByte (byte in) {
    byte out= 0;
    for ...
    andrewbroad andrewbroad October 2003 Development
  • Z80 coders compoIf you're interested in Z80 coders compo, visit my page [url="http://mbr.nm.ru/compo.html"]http://mbr.nm.ru/compo.html[/url]

    ...

    ORG #6D11 ;First byte may be different

    back to 0
    JR INC2 ... />
    gaining one very evident byte :D

    (Edits: This ...
    Metalbrain Metalbrain November 2003 Development
  • Z80 coders compoIf you're interested in Z80 coders compo, visit my page [url="http://mbr.nm.ru/compo.html"]http://mbr.nm.ru/compo.html[/url]

    ... the mail he sent me back:

    [I]
    > ... the entry must take a byte (0x00 - 0xFF) in any register ...
    Metalbrain Metalbrain November 2003 Development
  • Another Free Ebay Day ;- Link to 300+ ?1.50 all in[url="http://cgi6.ebay.co.uk/ws/eBayISAPI.dll?ViewListedItems&userid=cornishdavey&include=0&since=-1&sort=2&rows=200&rdir=0"]http://cgi6.ebay.co.uk/w…

    ... 2

    Bug Byte
    Glider Rider
    Invaders ... Black Lamp
    Booty
    Byte Bitten
    Chicken Chase
    G-Force
    Euro Byte

    Game Busters

    Microsphere
    Back to School

    Mikro ...
    Cornishdavey:)) Cornishdavey:)) January 2004 Sales
  • 42 column text, Sinclair Print Utilities, etcI'm currently developing the next of the ZXIF text adventures - "43 Minutes" and, as a side issue, I'm really interested in 42 column text for this g…

    ... a whole load of 0 byte data blocks. Taper reports also ... you an answer. a while back i found a heapload of ...
    Sadako Sadako March 2004 Development
  • whats your second favourite retro computerOk i'm going to assume that for most of us here the speccy is our favourite number 1 retro computer,its the best home computer in the world etc etc :…

    ... /2048 = 9.77 cycles per byte?[/quote]

    About 8 ... [/I] unrolled (two commands per byte) and there's no other ... change the index and branch back.

    As i said ... 1.253MHz z80 for the byte copy task, or the spec ...
    TMR TMR March 2004 Games
  • 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…

    ... was mulling over a while back, and I don't think ... tables, I think translating a byte to the appropriate AY output ...
    gasman gasman March 2004 Sinclair Miscellaneous
  • EmuZWin supports 256 color gamesI am sorry starting new topic, but you see this info is important a bit: new version 2.4 of the EmuZWin is available to download, and it supports 25…

    ... and repaint the whole game byte by byte !!!
    However I am ... copy the output on screen back into memory ) or is it ...
    Arm73 Arm73 April 2004 Emulators
  • 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
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