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<1…17181920212223…34>
  • Documentation for SP1 for Z88DK?(I was going to post in [URL="http://www.worldofspectrum.org/forums/showthread.php?t=11729"]the other thread[/URL], so if a mod thinks this should go…

    ... yourself, change line 8 of [URL="http://z88dk.cvs. ... little bit off the top of my head.

    ... /> ;
    ; enter : hl = unsigned integer
    ; de = char *buffer
    dec h
    jr z, eight_bit

    ld ...
    Alcoholics Anonymous Alcoholics Anonymous December 2013 Development
  • Getting aquainted with the IF1bisToday, fifteen days after dispatch, the IF1bis arrived at my door. In perfect order. No customs, no TVA and no handling fee involved. The arrival of …

    ... of code into SH ROM
    ;------------------------------
    OUT ... sec
    JR Z,x2 ;Z=end count
    roko roko December 2013 Hardware
  • Z80AsmI've been using the Z80 PC Assembler 1.2 by Peter Hanratty and found that the RST 8 instruction assembles to 200. It should be 207. Ret Z is 200 wh…

    ... t handle the IN or OUT instructions or CALL C, ... /> Z80 ASM
    ; Disassembly of the file "C:\Documents and ... /> ZX SPIN
    ; Disassembly of the file "C:\Documents and ... 0000H ; (-0ah)
    000a 28F4 JR Z,0000H ; (-0ch)
    000c ...
    rune rune December 2013 Development
  • Clearing 22 lines of the screenHow do I go about clearing the top 22 lines of the screen and leave the bottom #0 area untouched? I have a routine to reset the attributes, but cant…

    ...
    bit 4,h
    jr z,l1
    ld a,l ...
    bit 3,h
    jr z,l0 ; was l1
    ret ... /> I now got an understanding of how your code works, still ... OK Davey, glad to help out.

    R-Tape... your ...
    MatGubbins MatGubbins January 2014 Development
  • Idiots Guide......To machine code, or assembler language...whatever the appropriate term is Basically at this stage I want to fiddle about and try and get used to…

    ... become much less important with out-of-order execution & CISCs going ... br /> or a
    ret z ; basic might complain if some ... br />
    inc hl
    jr loop

    _result:
    out there than z88dk's inline ...
    Alcoholics Anonymous Alcoholics Anonymous January 2014 Development
  • Tile routinesHi all, Please does anyone have any examples of tile routines in pure asm to set up maptile screens. I would like to try and understand them and ti…

    ... you want a lot of tiles to be flipped ... bits 6 and 7 of the tile number to ...
    jr z, .flipvertical
    bit 6, a
    jr z, .fliphorizontal< ... /> and %11111100 ; mask out the tile number without the ...

    ; rest of your code here..
    ...
    polomint polomint March 2014 Development
  • IF1Bis problems. The Edge of the Spectrum...Advice is sought from the learned on WoS. I just bought an Interface 1Bis from sunny South Africa. It arrived fast, but unfortunately doesn't work.…

    ... JR Z,DIS_WR
    0059 : d3bf NX_SYS OUT (SHD),A
    005b : 18c2 JR ... backed by a comprehensive set of documents, from schematic and manufacturing ... not fully comprehend the contents of relevant documents, and also ...
    Dan Antohi Dan Antohi March 2014 Hardware
  • ZX Alien BreedNot sure if this has been mentioned already (I did trawl the threads but couldn't see anything :smile: ), but I've always hankered after a Speccy Ali…

    ... should allow them to stand out more. It does seem ... and de
    jr splooph ;back to start of loop
    < ... br /> nextrow: ;Next row of sprite
    ld a,(sprheight ...
    dec a
    jr z,sprdone ;If zero, then sprite ...
    LuMan LuMan March 2014 New game ideas
  • Interface 1bis updateSupport for connecting a standard PC keyboard to the interface?s PS/2 socket, in place of a mouse, has been added. The external keyboard?s output is …

    ... I can't think of any reason why it wouldn ... ;006c JP Z80_SN
    ;006f OUT (BAS),A
    0069 : cd4d16 ... External keyboard?
    38b7 : 2807 JR Z,NO_BRK; Inactive!
    38b9 : fea0 ...
    Dan Antohi Dan Antohi April 2014 Hardware
  • Interface 1bis updateSupport for connecting a standard PC keyboard to the interface?s PS/2 socket, in place of a mouse, has been added. The external keyboard?s output is …

    ... considered in the context of the original ZX Spectrum ... ROM
    ;
    ;0092 OUT (BAS),A
    0094 = ... External keyboard?
    38b1 : 2807 JR Z,NO_BRK; Inactive!
    38b3 : ...
    Dan Antohi Dan Antohi April 2014 Hardware
  • Unusual custom turbo loaders - with sourcesI have always been fascinated by turbo loaders; my games all feature a TZX version with one of such schemes implemented, and I have been experimentin…

    ... room left until the top of RAM.

    Here ... br /> AND 032
    JR Z,65338
    LD A,C ...
    OR 008
    OUT (254),A
    SCF
    AND A
    JR Z,65386
    LD A,(65389 ... br /> AND A
    JR Z,65386
    LD A,(65389 ...
    Alessandro Grussu Alessandro Grussu May 2014 Development
  • Unusual custom turbo loaders - with sourcesI have always been fascinated by turbo loaders; my games all feature a TZX version with one of such schemes implemented, and I have been experimentin…

    ... - after SIPE - of the Italian market of hacked games with false ... seconds against the 21 of Biturbo II. The author ... /> LD A,015
    OUT (254),A
    LD ... br /> AND 032
    JR Z,65508
    LD A,C ... br /> OR 008
    OUT (254),A
    POP AF ...
    Alessandro Grussu Alessandro Grussu May 2014 Development
  • Unusual custom turbo loaders - with sourcesI have always been fascinated by turbo loaders; my games all feature a TZX version with one of such schemes implemented, and I have been experimentin…

    ... than 13 different combination of colors. Although I employed ... br /> AND 032
    JR Z,65510
    LD A,C ... br /> OR 008
    OUT (254),A
    SCF
    AND 032
    JR Z,65510
    LD A, ... br /> OR 008
    OUT (254),A
    SCF< ...
    Alessandro Grussu Alessandro Grussu May 2014 Development
  • Unusual custom turbo loaders - with sourcesI have always been fascinated by turbo loaders; my games all feature a TZX version with one of such schemes implemented, and I have been experimentin…

    ... id=0000996"]Erbe re-release of Cobra[/URL]. I don't ... /> LD A,015
    OUT (254),A
    LD HL ...
    CALL 65499
    JR NC,65380
    LD B ... C
    AND 032
    JR Z,65509
    LD A,C ... 007
    OR 008
    OUT (254),A
    SCF
    Alessandro Grussu Alessandro Grussu May 2014 Development
  • Sorting BusinessThis is a little bit different from the usual game-related fare but I know there are a few people here who like this sort of thing. This is about so…

    ... br /> cp d
    jp z, error_znc - 1 ; finished if ...

    rla
    jr nc, insert_exit ; if array[j ... because you can never be out of balance by more than ... /> The issue is I am out of registers, there is already an ...
    Alcoholics Anonymous Alcoholics Anonymous May 2014 Development
  • Block RoutineHi Folks, I want to draw a block on the screen dependent on providing the X,Y,W,H values. I came up with the following: [CODE]100 LET l$=" …

    ... t very pretty. The "out of screen" check is wrong ... /> RET P ;quit if out of screen
    LD (a63092 ... zero into each byte in range
    INC HL< ... LD L,A
    JR NC,a63089
    LD ... br /> dec c
    jr nz,rowloop

    Battle Bunny Battle Bunny July 2014 Sinclair Basic
  • Issue 6 repair with a twist...(Starting with a slight grump - the forum ate my first attempt at this so this'll probably end up being a bit terse :)) I got a Issue 6 48K machine …

    ... writes memory from the top of address space down, as ... and uses the high byte of IX to store a map ... (hl)
    cp 0
    jr z, .marchtest2.next

    ...
    ld a, BORDERRED
    out (ULA_PORT), a

    ...
    balford balford September 2014 Hardware
  • Game of Life.Last year (I think) or maybe the year before, I entered a Game of Life simulator into the CSS CGC compo but for the Sinclair ZX81. I decided to port…

    ... ld de,Gdollar ;DE=address of "g$()"
    call ... br /> INC HL
    JR Z,RND2
    RND3: LD ... %00000111 ;A =value in range 0-7
    ret
    of "g$()"
    call ...
    Battle Bunny Battle Bunny October 2014 Sinclair Basic
  • Detecting flash mode inversionsIs is possible to detect with certainty when flashing characters change from normal to inverted and vice-versa?

    ... byte of frame counter
    AND $F0 ; Mask out low nybble ...
    LD (OLDFRAMESLB),A ; Save Hi nybble of ... low byte of frame counter
    CP B
    JR Z ... XOR @00000001 ; Invert LSB of FLASHFLAG
    LD (FLASHFLAG ...
    dbolli dbolli November 2014 Development
  • Detecting flash mode inversionsIs is possible to detect with certainty when flashing characters change from normal to inverted and vice-versa?

    ... byte of frame counter
    AND $F0 ; Mask out low nybble ...
    LD (OLDFRAMESLB),A ; Save Hi nybble of ... low byte of frame counter
    CP B
    JR Z ... XOR @00000001 ; Invert LSB of FLASHFLAG
    LD (FLASHFLAG ...
    Einar Saukas Einar Saukas November 2014 Development
  • New Game(s): Sir Ababol 2 and Sir Ababol DXHere is our own Christmas Present from Mojonia! We weren't going to release these games (at least, by the moment) but we decided just yesterday to fi…

    ... , is give the option of OPQAM or joysticks, but ... That means that most of the time it simply ... xor 31 gives zero
    jr z,rdlp1
    got_key ;key ... br /> and 248
    out (254),a
    djnz lnlp ... rem to change the number of keys accordingly
    db ...
    R-Tape R-Tape January 2015 Brand new software
  • Hungarian notation for asm - Yes or No ?There is thing called hungarian notation - https://en.wikipedia.org/wiki/Hungarian_notation Basically it is all about using prefixed indetifier to i…

    ... /> cp 128+96
    jr nz, ai_last_loop ; if (opponent ... br /> cp 128-96
    jr z, ai_last_loop ; if (player won' ... I know exactly the valid range of values for each parameter, how ...
    Einar Saukas Einar Saukas July 2015 Development
  • 40 Column Printing RoutineI've written a 40 column printing routine, which I'd like to share... It's my first piece of 'public' code so go easy on me! I don't think it is a…

    ... /> ex de,hl ; de=start of char
    ;; vmem start
    cp #0 ; no shifts?
    jr z,pch_sh_done ; shift is done
    and #0x07 ; mask out 00000111
    or #0x40 ; vmem ... at the end
    ;; of every char as 6x6=36 ...
    tstih tstih August 2015 Development
  • 1-Bit Sound AccuracyI'm hoping someone can give this snapshot a try on a real machine (just press enter to start the music): https://drive.google.com/file/d/0B6XhJJ33xp…

    ... integer multiples of that 32kHz, 48kHz, etc which is both well out of the range of ... human hearing and outside the frequency response of ... sidelobes added to versions of itself every sample rate ... moved from the peak of a sidelobe to something ...
    Alcoholics Anonymous Alcoholics Anonymous September 2015 Development
  • Games not compatible with the 128+ & grey +2Like the +2A & +3 thread, there are a few games that do not work correctly on the original 128+ and the grey +2. Two games that I know of that wil…

    ... at hl a ae?
    jr z,patch ; if so, crack similar ... ),a ; patch the value of a into jr nz
    ld hl ... backwards to keep track of r
    dcrend jr nz,$ ; this is ... out r
    ;
    done equ $
    ld hl,last ; address of ...
    jp jp October 2015 Games
  • Small Machine Code Routines Which Maybe UsefulAs part of creating Flynn's Adventure in Bombland I created a lot of little routines to do all sorts of things. A lot of these I created based on inp…

    ... /> jp segdown ;if Z we have overclocked the low ... /> bit 7,c
    jr z,prighthalf
    plefthalf: ;left ... cpl
    and 31
    jr z,aklp
    ret
    ... br /> and 31
    jr nz,no_key
    ret
    Z
    db 224, 174, ...
    R-Tape R-Tape December 2015 Development
<1…17181920212223…34>

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