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Search Again :: Adv Search 1000 results in 0.019s
<1234567…34>
  • Common pitfalls and solutionsLet's discuss some of the common problems in Speccy programming, and the methods we use to avoid them. For an example, here is a piece of code that …

    ...
    LD BC,4
    LDIR
    RES 4,(IY+01)[/code]

    Hikaru Hikaru August 2010 Development
  • BREAK from GOSUBHere's another one. Just in case you wanted to break out of multiple GOSUB levels with a single command, here's a routine to do it, tested on all mod…

    ... ; 16 233
    INC B ; 4 ;reset Zero flag
    EXX ...
    POP HL ; 225
    RES 4, (IY+1) ; 253 203 1 166 ...
    Battle Bunny Battle Bunny December 2011 Sinclair Basic
  • Switch to 48mode without 'SPECTRUM' commandIs there a poke(s) to switch to 48 mode without SPECTRUM command. I want my tape loaders to switch automatically. I know how to switch ram banks ok…

    ...
    OUT (C),A
    RES 4,(IY+1) ; Reset "128 BASIC" flag ...
    John Elliott John Elliott October 2005 Sinclair Basic
  • Usr 0 ?I'm not sure I've ever seen this explained before, but why do some programs (only demos, as far as I can see, so far) need USR 0 mode when run on a 1…

    ... ,HL
    LD BC,4
    LDIR
    RES 4,(IY+01)

    Shadow Maker Shadow Maker December 2008 Sinclair Miscellaneous
  • Usr 0 ?I'm not sure I've ever seen this explained before, but why do some programs (only demos, as far as I can see, so far) need USR 0 mode when run on a 1…

    ...
    FD CB 01 A6 RES 4,(IY+1)
    C9 RET
    RES 4,(IY+1) to get 48 BASIC ...
    John Elliott John Elliott December 2008 Sinclair Miscellaneous
  • Russian Translations...As i have once again been reminded (by the "Homebrew games" thread), there are some funky looking Russian games that I can't play due to not understa…

    [QUOTE=FrankT;361395]For +2A +3, I don't know.[/QUOTE]

    Try clearing bit 4 of (23611). A simple RES 4,(IY+1) if IY holds its normal value :)

    Edit: Preferably before the interrupts are enabled.
    Bob Stains Bob Stains June 2009 Games
  • Russian Translations...As i have once again been reminded (by the "Homebrew games" thread), there are some funky looking Russian games that I can't play due to not understa…

    ... clearing bit 4 of (23611). A simple RES 4,(IY+1) if IY holds its ...
    FrankT FrankT June 2009 Games
  • 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…

    ... 48 BASIC:
    [code]
    res 4, (iy+1) ; clear 128 mode bit ... hl, 4867 ; address of MAIN-4 in ROM
    push hl ...
    Marko Marko September 2009 Sinclair Miscellaneous
  • Converting games from tap to dskHi to all from Greece, Being an old Speccy user and now owner of most models of Spectrum (48k , 48k+ , 128K, +2 grey and +3) , I desided to salvage m…

    ...
    OUT (C), A
    RES 4, (IY+$01)
    RET[/code]
    FrankT FrankT January 2010 Emulators
  • Real Spectrum screen flicker with SCREEN$I've written a basic loader to simply do a 'load "" screen$' based video from a divide+ however I'm finding the Spectrum can't render a screens and a…

    ... ,HL
    LD BC,4
    LDIR
    RES 4,(IY+01)

    zxbruno zxbruno March 2010 Development
  • +3 assembler questionI was wondering if anyone could give any suggestions as to how to get this bit of code working on the +2A/+3 in 128k mode. It works on the +128k/+2 i…

    ... just needed to put a RES 4,(IY+1) at the start of ... the +3 is using bit 4 of FLAGS for, though. The ...
    Battle Bunny Battle Bunny August 2010 Sinclair Basic
  • Common pitfalls and solutionsLet's discuss some of the common problems in Speccy programming, and the methods we use to avoid them. For an example, here is a piece of code that …

    ...
    LD BC,4
    LDIR
    RES 4,(IY+01)[/code]

    BiNMaN BiNMaN August 2010 Development
  • Common pitfalls and solutionsLet's discuss some of the common problems in Speccy programming, and the methods we use to avoid them. For an example, here is a piece of code that …

    ... ,HL
    LD BC,4
    LDIR
    RES 4,(IY+01)

    zxbruno zxbruno August 2010 Development
  • Supertest 128 - Loader QuestionI wonder if someone could explain (in simple terms please) :) , the purpose of the switch code. I see what is doing (going to 48k mode via spectrum)…

    ... /> ; 8. Load bank 4 at 4:C000: 0x4000 bytes
    ... 4
    ld de,04000h
    ld hl,0C000h
    ld iy ... mode
    ;
    res 4,(iy+1)
    ei
    ... ld a,(BANKM)
    res 4,a ;ROM2
    or ... ret
    ;
    pciy: jp (iy)
    ;
    bank7:
    John Elliott John Elliott January 2011 Games
  • tiny routine to shift RAMTOP & stackCompressing some data areas above RAMTOP and wanting to make the released space available for BASIC arrays, I needed to move RAMTOP without using CLE…

    ... is new.

    The "RES 4,(IY+1)" line is to tell ... /> EX DE, HL ; 235
    RES 4, (IY+1) ; 253 203 1 166 ...
    Battle Bunny Battle Bunny November 2011 Sinclair Basic
  • tiny routine to shift RAMTOP & stackCompressing some data areas above RAMTOP and wanting to make the released space available for BASIC arrays, I needed to move RAMTOP without using CLE…

    ... /> EX DE, HL ; 235
    RES 4, (IY+1) ; 253 203 1 166 ...
    Battle Bunny Battle Bunny November 2011 Sinclair Basic
  • Tr-Dos questionI hope that people who know Tr-Dos also read these forums :) Let's suppose that I have a .trd disk with an executable file. I want to make this fil…

    ... />
    begin dw 0,length-4 ;; line number, line length

    runusr res 4,(iy+#01) ;; Switch to 48 basic ...
    velesoft velesoft November 2011 Development
  • BREAK from GOSUBHere's another one. Just in case you wanted to break out of multiple GOSUB levels with a single command, here's a routine to do it, tested on all mod…

    ... BC ;restore STMT_RET
    NOGSUB: RES 4, (IY+1) ;+2A/+3/+3e fix ...
    Battle Bunny Battle Bunny December 2011 Sinclair Basic
  • Arkanoid - Hit Squad ReleaseInfoseek (and the [URL="ftp://ftp.worldofspectrum.org/pub/sinclair/games/a/Arkanoid(TheHitSquad).tzx.zip"]TZX[/URL] itself) identifies the Hit Squad …

    ... the opcode [B]LD IY,$0000[/B] reveals the ... org $ee44
    ;
    ld iy, $0000 ; ee44 fd 21 00 ... ; e075 ed 79
    res 4, (iy+$01) ; e077 fd cb 01 ... e0fa 0f
    ld sp, iy ; e0fb fd f9
    ... org $e8f9
    ;
    ld iy, $0000 ; e8f9 fd 21 00 ...
    jp jp December 2011 Infoseek database
  • Definitive list of games incompatible with +2A/+3 and of compatible versions (if any)I am trying to compile the definitive list of games which are incompatible with the +2A and the +3 and of their compatible versions, if they are pres…

    ... />
    begin dw 0,length-4 ;; line number, line length

    runusr res 4,(iy+#01) ;; Switch to 48 basic ...
    velesoft velesoft January 2012 Games
  • SUPER INPUTA couple days ago I searched for an "INPUT string" routine that I could use in Assembly programs and supported multiple lines, but I found none. Thus…

    ... often).
    [code]
    MCTRAP: RES 4,(IY+1) ;patch for +3 128k ...
    Battle Bunny Battle Bunny June 2012 Development
  • Switching 48/128 modes within a BASIC programI'm not sure what use this would be; ie. being able to switch between 48k and 128k modes and back again from within a continuously running BASIC prog…

    ...
    dec sp
    bit 4,(iy+$01)
    jr z,MODE48 ... z ;16k/48k
    bit 4,(iy+$01)
    jr nz,TO48 ...
    jr TO_ALL
    TO48: res 4,(iy+$01) ;signal "48K BASIC" mode ...
    Battle Bunny Battle Bunny July 2012 Sinclair Basic
  • USR 0I've heard a lot about loading a program in USR 0 (and yes, I know how to do it - "RANDOMIZE USR 0" in 128 BASIC). What I want to know is: What is th…

    ... ,HL
    LD C,4:LDIR
    RES 4,(IY+1)
    LD DE ...
    g0blinish g0blinish November 2012 Hardware
  • RAM used / corrupted by +3DOSAs I said previously, [url=http://www.worldofspectrum.org/forums/showthread.php?t=41775]I'm trying to put some games in hard disk[/url] so they can b…

    ... and just do :-

    RES 4,(IY+1)
    LD A,71 ...
    nuggetreggae nuggetreggae December 2012 Games
  • Tapper - standard ROM timings loader version?I've had at least two copies of Tapper over the years but the most recent one I acquired seems to be a previously unknown(?) variant that uses a stan…

    ... a stack rebuilder and a RES 4,(IY+1) which is used for ...
    nuggetreggae nuggetreggae December 2012 MIA/STP/SDP
  • Tapper - standard ROM timings loader version?I've had at least two copies of Tapper over the years but the most recent one I acquired seems to be a previously unknown(?) variant that uses a stan…

    ... a stack rebuilder and a RES 4,(IY+1) which is used for ...
    richl richl January 2013 MIA/STP/SDP
  • Yumiko in the haunted MansionSo, here is the promised Halloween preview... Go to the zx section of my homepage to download it. [img]http://members.inode.at/838331/zx/YomikoInTheH…

    ... /> Just tested and doing a res 4, (iy+$01) fixes it.

    FrankT FrankT January 2013 Brand new software
  • Switch 128k to 48k modeNot sure how to go about this using MC, in 128 basic you can type SPECTRUM to revert to 48 mode (I think), but how would I go about switching modes u…

    ...
    OUT (C),A
    RES 4,(IY+1)
    EI
    JP ...
    nuggetreggae nuggetreggae February 2013 Development
  • Varios +3(e)DOS questions?I'm converting tape games to disk, for being used in my +3e. I'm trying to convert them to standard BASIC loaders, so files could be copied using BAS…

    ...
    OUT (C), A
    RES 4,(IY+1) ; Reset '128 BASIC' flag ...
    John Elliott John Elliott May 2013 Development
  • 'Tir Na Nog' loading screenHere's the original: [URL=http://s23.photobucket.com/user/mlucifersam/media/TirNaNogOrigScr_zps3c500784.jpg.html][IMG]http://i23.photobucket.com/albu…

    ... headerless tap loader and added res 4,(iy+$01) which disables paging on ...
    FrankT FrankT June 2013 Games
<1234567…34>

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