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<1…18192021222324…34>
  • Text scroller and custom fontYesterday I was testing this text scroll routine taken from Jonathan Cauldwell's Intro Maker (labels have been inserted to allow partial code relocab…

    ... to put this vertical line of pixels
    RLCA < ... B ; now lets figure out the low byte
    ... ,(PUNTO_A) ; this block of code will copy the line ... br /> AND C
    JR Z,L_35464
    INC (HL ... ; HL now address of the character in the ...
    seedy1812 seedy1812 January 2016 Development
  • Help needed with MIA software with custom (?) loaderHi, I've got into my hands recently a bunch of Polish educational software which are unknown MIA on WOS. I believe they are protected with some…

    ... 4t; Decrement higher part of pilot pulse counter
    ... all bytes saved
    0xEA9A JR Z,EAA8 ; If yes, jump ahead ... ; Timing loop
    0xEAB6 OUT (FE),A ; Set MIC/ ... white (ROM)
    0xEAE4 OUT (FE),A ; Set MIC/ ...
    lfaria lfaria August 2016 MIA/STP/SDP
  • Help needed with MIA software with custom (?) loaderHi, I've got into my hands recently a bunch of Polish educational software which are unknown MIA on WOS. I believe they are protected with some…

    ... ':' ? (ROM)
    0x5B14 JR Z,5B00 ; Go aroud the loop ... by +CE; giving the range +00 to +31 for ... of program'.(ROM)
    0x5B7B LD A,B ; (ROM)
    0x5B7C JR Z ... ENTER (ROM)
    0x5BC8 JR Z,5B84 ; (ROM)
    0x5BCA ...
    lfaria lfaria August 2016 MIA/STP/SDP
  • Must be missing the point - machine code... Hi Folks, Trying my hand at machine code again but falling at the first hurdle. I hand crafted the following to run at address 62000 and the co…

    ... . You can eliminate the use of C as a counter by ... />
    [code]DEC C
    JR NZ,Loop[/code]

    JR Z,Loop[/code]

    Which means you can get rid of ... 'LD C,$18'.

    Bonus points for figuring out ...
    SkoolKid SkoolKid September 2016 Development
  • Must be missing the point - machine code... Hi Folks, Trying my hand at machine code again but falling at the first hurdle. I hand crafted the following to run at address 62000 and the co…

    ... . You can eliminate the use of C as a counter by ... />
    [code]DEC C
    JR NZ,Loop[/code]

    JR Z,Loop[/code]

    Which means you can get rid of ... 'LD C,$18'.

    Bonus points for figuring out ...
    Paddy Coleman Paddy Coleman September 2016 Development
  • Must be missing the point - machine code... Hi Folks, Trying my hand at machine code again but falling at the first hurdle. I hand crafted the following to run at address 62000 and the co…

    ... can eliminate the use of C as a counter ... br /> [code]DEC C
    JR NZ,Loop[/code]

    JR Z,Loop[/code]

    Which means you can get rid of ... 'LD C,$18'.

    Bonus points for figuring out ... What will the value of HL be when you ...
    JamesD JamesD September 2016 Development
  • Must be missing the point - machine code... Hi Folks, Trying my hand at machine code again but falling at the first hurdle. I hand crafted the following to run at address 62000 and the co…

    ... can eliminate the use of C as a counter ... br /> [code]DEC C
    JR NZ,Loop[/code]

    JR Z,Loop[/code]

    Which means you can get rid of ... 'LD C,$18'.

    Bonus points for figuring out ... What will the value of HL be when you ...
    Paddy Coleman Paddy Coleman September 2016 Development
  • Must be missing the point - machine code... Hi Folks, Trying my hand at machine code again but falling at the first hurdle. I hand crafted the following to run at address 62000 and the co…

    ... ]utz[/b] pointed out, using 'BIT 3,H; JR Z,Loop' terminates the ... point only the top third of the screen is done. Bit ... of a flaw, that. :)

    ... test bits 3 and 4 of H, but then you're ...
    SkoolKid SkoolKid September 2016 Development
  • c64 .sid player coming soon to specy 128!!!c64 .sid player coming soon to specy 128!!! the first old version uses only square waves, 4 years ago: https://www.youtube.com/watch?v=6CKt9noxA7s…

    ... AY
    .AY_found
    out (c),l ;select "AY ... FF in this case
    jr z,.AY_type2149F
    .AY_type8910 ;while ... (ignores the upper nibble of the argument) but would ... />
    A couple of other things I've noticed ...
    Hikaru Hikaru March 2017 Announcements
  • 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…

    ... djnz l04d8

    out (#fe),a
    xor #0f ... br /> rl a
    jr z,sv_next_byte

    ld ... l ; take a copy of L before rotating
    Woody Woody April 2017 Development
  • ZXSCLZF - Yet another Screen CompressorQuick disclaimer before I continue, this compressor does not shrink screens as small as some of the others posted here, in particular the very good z…

    ... br /> inc hl ; 7t
    jr _ulzfa020 ; 12t
    ;;
    ;; ... then end marker?
    ret z ; 11/5t - if control ... zxlayout(buffer,&buffer_ss) break out out of inner loop
    if ... max size reached -> break out of loop
    } while( ...
    TomD TomD April 2017 Development
  • Can Arkanoid be played using a Kempston joystick?It says so in the instructions but annoyingly without saying how. I load it up and no matter what button I start the game with, it won't work with a …

    ... 1F
    CP $1F
    JR Z,L800A
    XOR A
    out of the picture

    ... Speaking of the first Arkanoid, is there ... Perhaps there's some sort of point and/or logic to ...
    Hikaru Hikaru June 2017 Games
  • Flood Fill IssueHi Folks, Came across the following Flood Fill routine by John Metcalf: [code]; scanline fill by John Metcalf ; call with d=x-coord, e=y-coo…

    ... me. You are one byte out. Have a look under seekleft ...

    ; calculate bit position of pixel

    EA67: nextrun ... ;60033 14
    EA82: 2812 jr z,rightedge ;60034 28 12
    dbolli dbolli August 2017 Development
  • How can I make a UDG rotate?I designed a set of UDG's that can be used for making shapes or letters. Trouble is that my circle - for example - consists of 4 pieces and it would…

    ... be able to break out of it. Why can't ... offset with zero
    JR Z,mask_sprite_skip_1 ; If offset is ... CP B
    JR Z,mouse_y
    JR NC,right_edge
    ...
    colonel32 colonel32 November 2017 Sinclair Basic
  • Proportional-width fontsFor reasons that are still not quite clear to me (because I’ve always loved typography and design,) I never bothered to write a proportional-font rou…

    ... (esthetic choice, safe to leave out)


    ... position (number of shifts) into A
    jr z,char_no_shift ;is ... it zero (Z flag check only ... with cell boundary)?
    jr z,printer ;don't apply attributes ...
    Ast_A_Moore Ast_A_Moore March 2018 Development
  • INC not working as expected in LoopHi, i have been working on this for around 2 weeks now and Ive read myself into a hole. I am trying to increment HL. HL is referencing a display …

    ... , its just a series of linear instructions to me? ... code with a series of instructions with the opcode ... />
    The snipped of code I suggested earlier:
    cp $5b
    jr z,end
    [/code]
    ... You simply need to figure out what it is [i] ...
    Ast_A_Moore Ast_A_Moore April 2018 Assembler
  • Summary : Fifty Pascal Programs by SybexI got around getting [url="http://www.worldofspectrum.org/infoseekid.cgi?id=2001037"]this book[/url] and have had a look through it which consists of…

    ... a certain range.

    Once I had those out of the way ... x, target,
    80 inumber : integer;
    90 number,
    100 ... VAR
    480 j, idx : integer;
    490 {*}
    500 PROCEDURE ...
    CP/M User CP/M User July 2018 Sinclair Miscellaneous
  • Kempston Mouse DriverHi Folks, Does anyone know the email of Chris Cowley who wrote the Kempston Mouse Driver in the WOS Archive? Many thanks Paddy

    ... ; Notes: PointerXY - start position of pointer
    ; IX = points ... with zero
    JR Z,mask_sprite_skip_1 ; If offset ... B
    JR Z,mouse_y
    JR NC,right_edge
    JR mouse_btn

    set_vert_edge
    ; work out ...
    Paddy Coleman Paddy Coleman September 2018 Hardware
  • Printing text, part MMXIIXI'm pretty sure there's been a zillion threads about this already, and I don't think it's the first one by myself either, but here goes. Proportiona…

    ... 'm starting to run out of ideas on how to make ... br /> or a, a
    jr Z,fast_emptydata

    ; ... br /> bit 3, b
    jr Z, withinbyte

    exx ... moved to next byte
    jr Z, withinbyte
    ld a ...
    Sol_HSA Sol_HSA December 2018 Development
  • Proportional-width fontsFor reasons that are still not quite clear to me (because I’ve always loved typography and design,) I never bothered to write a proportional-font rou…

    ... comment out to leave at least one pixel
    ;of right ... ;restore low byte of bitmap addr
    jr nc,no_split1 ;does ... pixel position (number of shifts) into A
    jr z,char_no_shift ;is ... it zero (Z flag check only ...
    Ast_A_Moore Ast_A_Moore December 2018 Development
  • A Yankee in IraqI'm testing the game on the zx next and it currently hangs right after the game starts no matter what timing regimen and contention pattern is chosen…

    ... . Use the latest version of SpecEmu. Mark worked closely ...
    cp 126
    jr z,its_a_plus

    ld ... of port addr (must be in the $40–$7f range ... its_a_plus

    ;———————————END OF DETECT MACHINE MODEL——————————————
    [/code ...
    Ast_A_Moore Ast_A_Moore February 2019 Development
  • Randomised data samplingHere is something that could be written in BASIC, if anyone is interested. Lets say we want to sample a subset of a larger population, we can do t…

    ... /> * A(E) = copy of populated element array
    * E ... = number of elements in total; P = number ... * R = random +ve integer in the range 1 to P
    of remaining un-selected elements. ... Pick a random element out of the 512 and then - ...
    dmsmith dmsmith April 2020 Sinclair Basic
  • Dynamite Dan II - Island 6 - HELP!Hi all, can someone possibly create a snapshot of Island 6 (car park island) on Dynamite Dan II for me please? I'm trying to work out why half the…

    ... CODE
    xor a
    out ($fe),a ; BORDER 0
    cp $ff ; check end of data?
    jr z,poker ; jump to poker ... ; Check for key 1
    jr z,rungame

    dec c ... ; Check for key 2
    jr z,rungame

    dec c ...
    FrankT FrankT December 2020 Games
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