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Search Again :: Adv Search 1000 results in 0.032s
<1234567…34>
  • 16-Bit Binary MathsHi, I'm trying to figure a few things out regarding 16-bit maths (SBC HL, ss in particular). regHL is an UInt16 (unsigned 16-bit integer) in my emu…

    ... few things out regarding 16-bit maths (SBC HL, ss in particular).< ... br />
    regHL is an UInt16 (unsigned 16-bit ... them figured out for 8-bit calculations.

    ... how this would work with 16-bit numbers though. Any suggestions ...
    MadDoc MadDoc July 2008 Emulators
  • Spectrum games which are better than 16-bit versionsLet's talk about games which are better on the Speccy than on 16-bit machines. In my opinion Spectrum versions of "Chase HQ" and "Space Gun" are bet…

    Let's talk about games which are better on the Speccy than on 16-bit machines.
    In my opinion Spectrum versions of "Chase HQ" and "Space Gun" are better than Amiga versions.
    PopoCop PopoCop March 2006 Games
  • 16-bit WarsDoing a 8-bit war is a bit of a no-brainer but what's your 16-bit fave, Multiple votes are allowed

    Doing a 8-bit war is a bit of a no-brainer
    but what's your 16-bit fave, Multiple votes are allowed
    chop983 chop983 April 2007 Chit chat
  • 8-bit or 16-bit registers?I'm playing around with writing a Speccy emulator for mobile Java at the moment. I did a quick and dirty port of Qaop, which does run but at less tha…

    ... be done either as 8-bit or 16-bit, with conversions where required ... can obviously be left as 16-bit, but what about the others ... ? Will more 8-bit operations be performed than 16-bit? Any suggestions?
    bigredswitch bigredswitch June 2007 Emulators
  • What 80's games inspired the 8/16-bit sequence in Atlantis SquarePantis (the movie) ?So, I just caught a glimpse of SpongeBob SquarePants (the Atlantis SquarePantis movie with David Bowie, [B][I]NOT[/I] the game based on the movie[/B]…

    ... , it does look very 8/16-bit generic)

    ???

    ZnorXman ZnorXman October 2011 Chit chat
  • What if Sinclair had released a 16 bit Spectrum?Had Sir Clive not wasted his companies money on the white elephant that was the C5 and instead focused on competing with his rival computer manufactu…

    ... , how well would a Sinclair 16-bit Spectrum have fared?

    16-bit version given the ST and ...
    Nick Nick July 2014 Games
  • Ports of 16 bit gamesI was watching a video for the Speccy version of Turbo Outrun where the guy who posted the video said that whilst he didn't think it was as good the …

    ... it was superior to the 16 bit versions, something I disagree with ... few games ported from the 16 bits I feel that the ... pretty good conversions of the 16 bit games.

    So which ... feel fell short? And what 16 bit games would you liked to ...
    RonnieASA RonnieASA August 2014 Games
  • Looking at 16 bit screenshots as a speccy ownerHow did you feel when you looked at screenshots of 16 bit games as a speccy owner? I used to think how good it must be to own such a machine and get…

    How did you feel when you looked at screenshots of 16 bit games as a speccy owner?

    I used to think how good it must be to own such a machine and get those colored sprites etc.
    kinda crazy really
    slenkar slenkar November 2014 Sinclair Miscellaneous
  • What Spectrum games compare favourably with the 16 bit versions?Obviously Out Run is not one of them ;) But I'm interested in the late 80s period again when a lot of Spectrum games were sadly afterthought cash-…

    ... played well compared with their 16-bit equivalents?
    Spector Spector November 2018 Games
  • PLOT and DRAW in machine codeHow do you go about it? If I posted a really simple BASIC instruction could someone do a machine code routine so I could learn from it? I wouldnt k…

    ... but how do you load the registers with 2 ...
    How do you load minus numbers?!
    [/QUOTE]
    16-bit HL register with H the ... in the two 8-bit load equivalents are about getting ... been obvious that the 8-bit load equivalents were 'ld h ...
    Alcoholics Anonymous Alcoholics Anonymous January 2012 Development
  • Bit 3 And Bit 5 Of The Flag RegisterHi, I know that bits 3 and 5 are "undocumented" but does anyone know where I can find data on how they are handled? For instance, it would seem th…

    ... manipulating 16-bit numbers.

    For instance, in the ADD HL, DE ... instruction (using Phil's test suite) bit 3 ... />
    My 'calculate bit 3' routine simply sets bit 3 of the ... use when adding to the 16-bit HL register pair. Do I use ...
    MadDoc MadDoc June 2008 Emulators
  • Bit 3 And Bit 5 Of The Flag RegisterHi, I know that bits 3 and 5 are "undocumented" but does anyone know where I can find data on how they are handled? For instance, it would seem th…

    ... br /> My 'calculate bit 3' routine simply sets bit 3 of the ... to the same value as bit 3 in the last ... 8-bit result calculated (same for bit 5) but I ... use when adding to the 16-bit HL register pair. Do I use ... seeing that a 16-bit op is two 8 bit ops with a ...
    BloodBaz BloodBaz July 2008 Emulators
  • Correct flag response to BIT n,(HL) etc.When running the test program suggested by Arjun (thanks again), all intructions are passing the flag tests except the BIT n,(HL), BIT n,(IX+dis) and…

    ... the flag tests except the BIT n,(HL), BIT n,(IX+dis) and ... BIT n,(IY+dis) ones. I ... output), and it passes all BIT instruction tests (but fails RLD ... doc, which is updated after 16 bit additions, JR and LD r ...
    alien8r33d alien8r33d April 2010 Emulators
  • Tutorial - learn machine code in 30mins[B][I]Message from the moderators[/I] - bigjon has requested that readers' attention be drawn to a better version of this tutorial, one which is easi…

    ... says "No errors in 16 lines. 4 bytes generated ... manual chapter 16.
    Insert line 7, ld (hl),a. ... line'
    Insert line 16, 'add hl,de'
    To fill ... to the a register bit by bit and leaves a 1 ... which stand for LoaD ((hl) to (de)),Decrement (hl and de) and ...
    bigjon bigjon November 2009 Development
  • Assembly - Loops bigger than 255Hi, It looks like it's a bit difficult to make loops with more than 255 cycles on Z80 machine code, since the 16-bit decrements (DEC) do not alter a…

    ... machine code, since the 16-bit decrements (DEC) do not ... FOR example
    LD HL,16384 ; Beginning of the ... /> LD B,E ; Load the lower byte into B ... /> loop:
    LD (HL),62 ; Fill the video memory ... with this number
    INC HL
    DJNZ loop
    Zerg Zerg October 2013 Development
  • Z80: ABS(HL) functionI must be very tired but I cannot get my head around whether this function provides a correct implementation of a ABS function for a signed 16-bit va…

    ... function for a signed 16-bit value in HL. Can somebody check by ... HL contains a signed 16-bit value
    ; Output: HL = ABS(HL)
    ABSFunc:
    BIT ... can perform a SBC HL, DE with HL containing 0 and DE ... PUSH, POP, two EX DE, HL and something (OR A) to ...
    BloodBaz BloodBaz January 2014 Development
  • New version Emulator ZEsarUX-1.0Hi I have uploaded a new version of my Spectrum/ZX80/ZX81 emulator. This is a major stable version, with real timing for all the models and with hi-…

    ... up Z80 core using 16 bit operations for HL, DE, BC
    Added ... emulation
    Added option to load and save binary data
    chernandezba chernandezba May 2014 Emulators
  • Drawing some spritesI figured I want to draw some sprites. My target was to do a 16x16 masked sprite. There's no clearing here, just drawing the sprites. My first ite…

    ... . I massaged the data a bit, interleaving sprite data and mask ... . Code for one span (repeats 16 times):

    [code]

    ld a, (hl) ; load pixel from screen
    and ...
    Sol_HSA Sol_HSA November 2015 Development
  • A Neat Redefine Keys RoutinePreviously, I’ve only shared this routine with a couple of people via PM, but I’ve now decided to make it public. I optimized it for size, so it uses…

    ... use a 16-bit register
    ;pair, such as HL and zeroize ... ld e,(ix+2) ;load E with INK color
    ld (23695),a ;load ATTR_T with the new attributes ... to fetch key code and load it into DE
    ...
    ld a,e ;load A with E to compare ...
    Ast_A_Moore Ast_A_Moore October 2017 Development
  • 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 …

    ... HL,#9000
    LD B,16


    ; Find first reset bit ... DEC HL ; Move HL back 1.

    LD A,(HL) ; Load ... A with first byte with a reset bit.

    PUSH HL ... EXX ; bit in HL' and restore original HL.
    POP HL
    ...
    Fraser Fraser July 2002 Sinclair Miscellaneous
  • 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 …

    ... a reset bit.

    8019 7E 7 LD A,(HL) ; Load A ... .
    8022 2A3C80 16 LD HL,(HL_Store) ; Restore original HL.
    8025 7E ...
    Fraser Fraser July 2002 Sinclair Miscellaneous
  • Help understanding some z80 asmI'm trying to work out how to represent the structure of a "sprite" in the SAM as "Grabbed" by SmallC. I can see the assembler implementation but I …

    ... add hl,sp
    ld c,(hl)
    inc hl
    ld b,(hl)
    [/code]

    would load ... then loaded into HL before leaving the ... 16-bit return values are received in the HL register ... HL is used to step through the stack and load ...
    Alcoholics Anonymous Alcoholics Anonymous January 2007 Development
  • Where to start?Hi all, I wanna start coding something for the speccy. I have good experience at C/C++ and some other languages. I have coded asm on pc too, and ma…

    ... is the opcode for "ld hl,nn" so it may ... as defb rather than "LD HL,xxx" because it's ... distinguish between loading two eight bit values into the individual ... which is to load the HL pair with a single 16-bit value.

    [CODE]LD HL, 256*x+y[/CODE]
    Matt_B Matt_B March 2007 Development
  • Where to start?Hi all, I wanna start coding something for the speccy. I have good experience at C/C++ and some other languages. I have coded asm on pc too, and ma…

    ... />
    [code]
    ld (plx),hl
    [/code]

    was ... distinguish between loading two eight bit values into the individual registers ... which is to load the HL pair with a single 16-bit value.

    [CODE]LD HL, 256*x+y[/CODE][/QUOTE ...
    Alcoholics Anonymous Alcoholics Anonymous March 2007 Development
  • Jetpac questionHi all, I just bought a copy of Jetpac off of Ebay and I'm having problems. To start, I'm trying to play it on an issue 2 Speccy with Interface 1, 2 …

    ... />
    ;Every 16 passes - perform 2 bit FADE tests
    LD ... found" message
    LD D,16
    CALL QUICKPRINTSTR
    ... LD (HL),'-' ;Load dash into string, assuming none-faulty bit
    BIT 7,A ... Hex string at HL
    ;From 16-bit value stored in ...
    Digital Prawn Digital Prawn January 2009 Games
  • Speech reproduction on the Speccy - 2009 style?Thanks to Chapter 33 of [url="http://www.worldofspectrum.org/infoseekid.cgi?id=2000388"]Super Charge Your Spectrum[/url] by David Webb - "Speech Repr…

    ... to load the wave (and assumes it's 44.1kHz 16 bit PCM ... ))
    {
    printf("Unable to load wav: %s\n", SDL_GetError());
    Winston Winston January 2009 Development
  • Simple text compressionI just checked one idea about text compression. Do not take it as recomendation but rather as info which can you save some time when you are solving …

    ... follows: [I](word = 2 bytes/16 bit value)[/I]

    [code ... /> ; Load Number of nodes in Tree
    LD E, (HL)
    INC HL ... />

    ; Load Cursor (HL and C)
    LD HL, (CursorPos)
    LD ...
    BloodBaz BloodBaz May 2009 Development
  • Ultimate! Time WasterThis used to bug me big time 25 years ago.:mad: In the early 16k releases of Ultimate Play the Game , Games Jetpac Cookie Trans am there are three …

    ... code:
    [code]
    LD HL, $6004
    LD DE, $6000 ... ROM).
    [code]
    JP (HL)
    [/code]
    The reason ... ) may be meaningful as the 16-bit number 21313.

    ... being used by the final LOAD "" CODE command.

    ...
    BloodBaz BloodBaz May 2009 Games
  • New BUZZSAW+ Demo, No.2OK everybody, here's the latest demo of [I]Buzzsaw[/I]. This includes the title screen I wrote in Corfu with control selection, some new sprites and…

    ... . My title screen loads two 16-bit register pairs with two pairs ... ones per row). You could load these attributes for one line ... register pairs AF,BC,DE,HL, then your code for that ...
    joefish joefish August 2009 Development
<1234567…34>

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