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<1…19202122232425…34>
  • Variable sized tiles /tile routineHow would you do a variable sized tile routine where the tiles have position variables too? Thanks would be interested to learn :)

    ... hl)
    cp 255
    jr z, locationdone

    ... br /> inc hl
    jp buildlocation

    ... br /> cp 255
    jp nc, controlcharacter

    inc e
    jp coloursncoords

    ...
    alienbanana alienbanana January 2016 Development
  • Variable sized tiles /tile routineHow would you do a variable sized tile routine where the tiles have position variables too? Thanks would be interested to learn :)

    ... hl)
    cp 255
    jr z, locationdone

    ... br /> cp 255
    jp nc, controlcharacter

    inc e
    jp coloursncoords

    controlcharacter ... br /> inc e
    jp coloursncoords

    ...
    alienbanana alienbanana 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…

    ... 00 ; Initialize parity
    0xEA95 JP EA9C ; Jump ahead to S2 ... ; ...all bytes saved
    0xEA9A JR Z,EAA8 ; If yes, jump ahead ... /> 0xEAD1 INC A ;
    0xEAD2 JP NZ,EA98 ; Go back to ...
    lfaria lfaria August 2016 MIA/STP/SDP
  • Remove colour clash from Everyones a WallyWonder what the game would be like if the main sprite attributes were 8 hence avoiding the awful colour clash. Surely a handful of pokes would remed…

    ... /> ld a,(hl)
    jp 0xba4f

    0xb925 ... br /> dec a
    jr nz,0xba28
    pop ... /> 0xba4f cp 0x06
    jr nz,0xba54
    ld (hl ... /> or a
    jr z,0xba60
    ld a,( ... 0xba60 add hl,de
    jp 0xb18f[/code]

    ...
    Myrck Myrck September 2016 Games
  • Change JPs by JRsIs there any (easy) way to replace all long jumps with relative ones in assembler code? Of course, I can replace all in text editor, and then place …

    [quote="Sol_HSA;880511"]it's possible to replace all JPs with JRs by adding jump islands[/quote]

    Not all JPs can be replaced directly.
    JR NZ, Z, NC, C
    but
    JP NZ, Z, NC, C, PO, PE, P, M
    Bedazzle Bedazzle September 2016 Development
  • Optimized (in size) Z80 simulatorI am evaluating Z80 simulators to try to create a tool to analyse z80 programs. I'd like to start with a simple register coverage tool and t-state cy…

    ... file. Same goes with regular jp or jr instructions. Dealing with computed ... br /> or a, a
    jr Z,l_replace_00103$
    ld c, e ... /> or a,c
    jr NZ,l_replace_00114$
    [/code]
    or a,a
    jr Z,l_replace_00103
    ld c, e ...
    Alcoholics Anonymous Alcoholics Anonymous September 2016 Development
  • The state of source level debuggingI was just wondering if we can put on a table everything we collectively know about source level debugging for ZX Spectrum to get an overview of curr…

    ... STACK-BC ROM routine
    jp rndusrchk ; jump to debugger[/code ... /> or c ; for zero
    jr z,buggy ; if it is zero ...
    tstih tstih November 2016 Development
  • Look whats possible in 924 bytesSo, finally after over a year of development and nearly 25 years since I first designed the graphics, I've actually made it to the point where this i…

    ... ;current_square
    and 09h
    jp pe,main_call ;if white square ... />
    add a,a
    jr z,add_line_in
    dec a
    Arkannoyed Arkannoyed February 2017 Development
  • So where is the random number in the Speccy ?So I am messing around with ZX Spectrum Assembler and I want a random number. I looked up previous posts and one of the links said that random number…

    ... /> defb $38 ; end-calc
    JP FPTOA
    ;
    ; . . . . . . . . . . .
    ;
    AND A
    JR Z,GRNDEND
    SUB $10
    dbolli dbolli February 2017 Assembler
  • Look whats possible in 924 bytesSo, finally after over a year of development and nearly 25 years since I first designed the graphics, I've actually made it to the point where this i…

    ... current square
    jp pe,main_call ;if ... inc l
    jp nz,main_loop
    < ... or a ;
    jr z,next_right ;test if we ...
    Arkannoyed Arkannoyed March 2017 Development
  • Look whats possible in 924 bytesSo, finally after over a year of development and nearly 25 years since I first designed the graphics, I've actually made it to the point where this i…

    ... current square
    jp pe,main_call ;if ... inc l
    jp nz,main_loop
    < ... or a ;
    jr z,next_right ;test if we ...
    Arkannoyed Arkannoyed March 2017 Development
  • Speeding up PRINT code in ROMHi Folks, I seem to recall that someone stated the PRINT command is rather slow because it has to handle screen and printer printing - is this cor…

    ... = printer):
    [code]
    ... JR NZ (5) (always false) saves ... 7T (+20T for BIT)
    ... JP NZ (1) (always false) saves ... (always false) saves 5T "
    ... JR Z (2) (always true) and plain ... for time saved, and the "JP NZ" and "RET NZ" ...
    Battle Bunny Battle Bunny July 2017 Sinclair Basic
  • 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…

    ... 60020 B7
    EA75: 280D jr z,goright ;60021 28 0D
    EA82: 2812 jr z,rightedge ;60034 28 12
    EA87: 280D jr z,rightedge ;60039 28 0D
    EAC6: E9 jp (hl) ;60102 E9
    ...
    dbolli dbolli August 2017 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…

    ... adopted for [i]Seto Taisho Vs Yokai.[/i] It's been ... ,E
    INC A
    JR Z,MAIN
    LD B,5 ...
    CHECK: CP (HL)
    JR Z, MAIN
    INC HL
    RET Z
    RST 16
    JR PRINT
    RET ...
    Alessandro Grussu Alessandro Grussu October 2017 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…

    ... (no key pressed)
    jr z,key_check ;try again
    ... ld bc,5
    jp 8252 ;upon RETurn from ... /> ld bc,5
    jp 8252

    ... /> ld bc,7
    jp 8252

    ... /> ld bc,7
    jp 8252

    as_is_key ...
    Ast_A_Moore Ast_A_Moore October 2017 Development
  • 1k Chess (was the 924 bytes thing!)Hi, I've decided to do a major rewrite of large parts of the code for the isometric Chess thing that I've been messing with. It got to the point, …

    ... ,c ;
    jr nc,ovr_e ;
    jr z,skp1 ;
    ... inc c ;next
    jp nz,main_loop ;repeat if ...
    Arkannoyed Arkannoyed October 2017 Development
  • 1k Chess (was the 924 bytes thing!)Hi, I've decided to do a major rewrite of large parts of the code for the isometric Chess thing that I've been messing with. It got to the point, …

    ... d ;
    jr nc,ovr_e ;
    jr z,skp1 ;
    ... ;next square
    jp nz,main_loop ;repeat if ...
    Arkannoyed Arkannoyed November 2017 Development
  • BREAK key on 128k SpectrumWhat happens when BREAK is pressed on a 128k Spectrum? Why is it different from what happens on a 48k Spectrum. Is there a way to disable it or to …

    ... /> ld d,a
    JP $1e73 ;GO-TO-2
    jr z,MCCONT
    ld a,(19 ... $1f54 ;BREAK-KEY
    JP C,$1e73 ;GO-TO-2 ... "dec sp : dec sp : jp $5b3a" (normal +2A/+3 ...
    Battle Bunny Battle Bunny February 2018 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…

    ... source code. I only used JP where it had the most ... ) into A
    jr z,char_no_shift ;is it zero (Z flag check only ... bitmap
    dec ixh
    jp nz,char_pr

    pop ... flush with cell boundary)?
    jr z,printer ;don't apply attributes ...
    Ast_A_Moore Ast_A_Moore March 2018 Development
  • Rainbow Python (with code length less than 150 bytes).[url="http://zx-pk.ru/attachment.php?attachmentid=64971&d=1523562006"]Original with 93 bytes of main code.[/url] ([url="http://zx-pk.ru/threads/290…

    Sweet! A tiny adjustment, if I may.

    Replace

    [code]
    and $21
    cp $21
    jr z,begin[/code]
    with
    [code]
    and $21
    jp pe,begin[/code]
    One byte smaller and a tad faster.
    Ast_A_Moore Ast_A_Moore April 2018 Games
  • Rainbow Python (with code length less than 150 bytes).[url="http://zx-pk.ru/attachment.php?attachmentid=64971&d=1523562006"]Original with 93 bytes of main code.[/url] ([url="http://zx-pk.ru/threads/290…

    ... $21
    cp $21
    jr z,begin[/code]
    with
    [code]
    and $21
    jp pe,begin[/code]
    One ...
    weiv weiv April 2018 Games
  • Rainbow Python (with code length less than 150 bytes).[url="http://zx-pk.ru/attachment.php?attachmentid=64971&d=1523562006"]Original with 93 bytes of main code.[/url] ([url="http://zx-pk.ru/threads/290…

    ... $21
    cp $21
    jr z,begin[/code]
    with
    [code]
    and $21
    jp pe,begin[/code]
    One ... /> cpl
    and $21
    jr z,begin
    :)
    weiv weiv April 2018 Games
  • Rainbow Python (with code length less than 150 bytes).[url="http://zx-pk.ru/attachment.php?attachmentid=64971&d=1523562006"]Original with 93 bytes of main code.[/url] ([url="http://zx-pk.ru/threads/290…

    ... $21
    cp $21
    jr z,begin[/code]
    with
    [code]
    and $21
    jp pe,begin[/code]
    One ... /> cpl
    and $21
    jr z,begin
    :)[/quote]

    Ast_A_Moore Ast_A_Moore April 2018 Games
  • 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…

    ... the port addr and the JP NZ,** addr

    ld ... 126
    cp 126
    jr z,its_a_plus

    ld hl ... (v_sync_sw+1),hl ;redirect the JP NZ,** to DEC HL
    v_sync_sw jp nz,v_sync ;[10]
    [/code ...
    Ast_A_Moore Ast_A_Moore February 2019 Development
<1…19202122232425…34>

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