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<1…15161718192021…34>
  • Sprite adviceHello. So, I'm slowly getting to grips with Z80 assembly - currently equal parts frustration and enjoyment. Now looking for some advice to help shift…

    ... AND248 and look for NON-ZERO result.

    However, negative ... an AND 248 will give ZERO.

    But if the ... wrong way!? :}[/QUOTE]

    [code]
    ld a, first number ... :

    and 248
    [/code]

    there is no ...
    Fikee Fikee August 2006 Development
  • In Machine Code, what is the quickest way to sort bytes?I am playing around with some ordering of sprites, where I want to order them by vertical position. I used some Rodnay Zaks code to order some bytes…

    ... data set.

    This code hasn't been tested at ... , I haven't written Z80 code in a long time and ...
    JamesD JamesD September 2006 Development
  • The Only Reason Sinclair Succeeded (Provoking Controversy)Although I love my Sinclairs dearly, I think that the only reason they succeeded was because at the time most people did not know any better (factori…

    ... other day, there is source code to a C64 3D graphics ... tough to pick through the code due to the lack of ... nz,Finish ; If E became zero after DEC, we have to ... clock cycles by using page zero for the flag on the ...
    JamesD JamesD September 2006 Sinclair Miscellaneous
  • The Only Reason Sinclair Succeeded (Provoking Controversy)Although I love my Sinclairs dearly, I think that the only reason they succeeded was because at the time most people did not know any better (factori…

    ... write *good* z80 code than *good* 6502 code. The reason is ... lot of zero-page registers. The best way to code on the ... 6502 involves using those zero-page registers ... one accumulator and 256 interchangeable zero-page registers.

    [ ...
    Alcoholics Anonymous Alcoholics Anonymous September 2006 Sinclair Miscellaneous
  • The Only Reason Sinclair Succeeded (Provoking Controversy)Although I love my Sinclairs dearly, I think that the only reason they succeeded was because at the time most people did not know any better (factori…

    ... hudreds of thousands of lines code for stuff like this... ... other one):

    [CODE]sort: ld hl, numbers ; point ... zero, swap occurred so, repeat sort
    ret ; sort complete[/CODE]< ... index registers in speed critical code.

    Even that ...
    Matt_B Matt_B September 2006 Sinclair Miscellaneous
  • The Only Reason Sinclair Succeeded (Provoking Controversy)Although I love my Sinclairs dearly, I think that the only reason they succeeded was because at the time most people did not know any better (factori…

    ... modified version:

    [code]
    10 sort: ld hl ... jp nz,sort ; if not zero we did a swap
    [/code]

    And here's ... with cycle annotations:

    [code]
    ;THIS SUBROUTINE ARRANGES THE ...
    Alcoholics Anonymous Alcoholics Anonymous September 2006 Sinclair Miscellaneous
  • The Only Reason Sinclair Succeeded (Provoking Controversy)Although I love my Sinclairs dearly, I think that the only reason they succeeded was because at the time most people did not know any better (factori…

    ... 6502 version using self modifying code. You could swap out all ... the necessary addresses into your code at the beginning of the ... adds another assumption to the code: all 256 bytes (or less ... do a lot in the zero-page.
    Alcoholics Anonymous Alcoholics Anonymous September 2006 Sinclair Miscellaneous
  • Pixel Explosion CodeJust a little snippet to cause explosive effects. It uses table lookups for the screen address, and can handle up to 32 pixel particles. A particle…

    ... your counters work:

    [code]
    inc (ix+4) ; increase ... nz, madp_nx2 ; counter not yet zero so check on y
    zero yet. But it would ... the dx, is exactly zero to know if the particle ...
    Alcoholics Anonymous Alcoholics Anonymous September 2006 Development
  • fdrawcmd.sysI have found the famous "fdrawcmd.sys" Real Disk driver for Real Spectrum for Windows 32. Will it affect my PC in a bad way?

    ... using it. The source code builds with zero PREfast warnings, and also ...
    obo obo October 2006 Sinclair Miscellaneous
  • Star Heritage::TranslationHi all! I am almost finished with a translation of a Russian adventure game Star Heritage (demo) to poor English. I need a volunteer(s) with a good …

    ... the game manual:

    [code]We're glad to present ... "life energy" of the hero. Zero value
    corresponds to death ... 51, "STEP" Creative Group.
    [/code]
    ant222 ant222 November 2006 Games
  • SjASMPlus cross compiler of Z80 assembly languageHi! I want to present you cross-compiler of Z80 assembly language: [B]SjASMPlus[/B]. [SIZE="4"]Features:[/SIZE] [LIST] [*]Z80/R800 documented and un…

    Just writing a little code for my CSSCGC entry (I ... as I had expected.
    [CODE] ORG $8000
    L1: ... LD HL,$
    [/CODE]
    While that code won't actually do ... space in the file with Zero's as I had expected ... to set the ORG of code that is to be moved ...
    icabod icabod November 2006 Development
  • SjASMPlus cross compiler of Z80 assembly languageHi! I want to present you cross-compiler of Z80 assembly language: [B]SjASMPlus[/B]. [SIZE="4"]Features:[/SIZE] [LIST] [*]Z80/R800 documented and un…

    ... space in the file with Zero's as I had ... set the ORG of code that is to be ... of sjasmplus is raw code and can be controlled ... 2. or add before your code pseudo-op "DEVICE ZXSPECTRUM48" (or ... enabled by DEVICE ...) will assemble code to virtual memory (as native ...
    aprisobal aprisobal November 2006 Development
  • Scrolling Loader CounterPlease can someone help me with writing a scrolling counter for a loading system. I like the Hewson counter so i`ve taken the font from zynaps loade…

    ... to make it alive.
    [code]
    endless_loop:
    call ... do_something_useful
    call show_char ;the code above

    ld ... next char after zero is nine again
    [code]
    ;continuing ...
    Fikee Fikee November 2006 Development
  • The New SPIN releases ThreadOk, as I'm now working on SPIN again full-time, and as a very wise man once said, "Release Early, Release Often"[1]... I'm going to release new SPIN…

    ... like the Spectrum was. Machine code routines would be used the ... on a Speccy, LOADed as CODE and the executed with a ... the OS to virtual address zero.

    We shall see ...
    Dunny Dunny November 2006 Emulators
  • Rst #38This, as far as I know, is the ROM procedure that does the keyboard check. (and, at the same time, is what's being executed by interrupt in IM 1 mode…

    ... ; Test if the result was zero.
    OR L ;
    JR ... to put text in a code box....
    DEATH DEATH November 2006 Development
  • tips on optimizing assemblyI wrote a small routine to rotate right a whole screen character line complete with attributes. This is my third ever assembly routine, so I guess i…

    ... reaches zero so the djnz is not necessary :razz:

    [code ... (hl),c
    ret
    [/code]
    Alcoholics Anonymous Alcoholics Anonymous November 2006 Development
  • tips on optimizing assemblyI wrote a small routine to rotate right a whole screen character line complete with attributes. This is my third ever assembly routine, so I guess i…

    ... any given point in your code. For example, this is ... seen:

    [CODE]ld hl,source
    ld ... t been altered since reaching zero after the first ldir. ... how often you see code loading values that aren' ... that specific point in the code.

    Also, ...
    Chris P Chris P December 2006 Development
  • tips on optimizing assemblyI wrote a small routine to rotate right a whole screen character line complete with attributes. This is my third ever assembly routine, so I guess i…

    ... any given point in your code. For example, this is ... seen:

    [CODE]ld hl,source
    ld ... t been altered since reaching zero after the first ldir. ... how often you see code loading values that aren' ... that specific point in the code.

    Also, ...
    na_th_an na_th_an December 2006 Development
  • Cool BASIC tricks and tips!Following on from Dunny's excellent suggestion of a compendium of BASIC tips + tricks, I believe it would be better to have a topic dedicated to it. …

    Erm... what was the code to poke the first line number in your program to zero?
    Arjun Arjun December 2006 Sinclair Basic
  • in quest for a z80 :DI am trying to find a Z80A in some retail shops here in Greece. I have only located the following CPUs branded as either Z80 without anything else o…

    [QUOTE=Pyjamarama]Hi
    I managed to find a Z80 but I do not know if it is the right one
    Z84C0008PEC
    Z80 CPU
    0124 74

    I hope it is the one (...anxious...)[/QUOTE]

    Z84C 0008 PEC
    Quazar Quazar January 2007 Hardware
  • TZX revision 1.20 finalSince everybody seems to agree with the last propositions, the specification for the TZX file format revision 1.20 now becomes final and you can find…

    ... to about two lines of code.
    I repeat: the data ... is absolutely right: "Length of ZERO bit pulse" represents the length ...
    Mikie Mikie January 2007 Emulators
  • problem with sinclair zx 48 issue 6aHi all, I have the following problem when I turn on my sinclair without rom inserted. [url]http://217.79.64.145/sinclair/5.jpg[/url] when I turn o…

    ... seemed data 7 as a zero-bit).
    I cut lotsa ... in the Z80:

    [code] D0 - Pin 14
    D1 ...
    D7 - Pin 13
    [/code]
    If you're lucky ...
    Marcelo Marcelo January 2007 Hardware
  • Cybernoid editorSo, my long tern goal is to make my own Cybernoid or Rex like game (see an ancient thread about Sprite advice)...but my skills are somewhat lacking..…

    ... , I add 48 (ASCII for zero). This yields the most significant ... 48. This is the ASCII code of the least significant digit ... :

    [code] 10 LET Byte=201
    code]I know this is slow ...
    Marcelo Marcelo February 2007 Development
  • PAW tests - help and discussion :)Hello my friends :) I have started to make some tests with PAW and I must say I'm very pleased and surprised at the great program. I will be posting…

    ... ):

    AT 10
    ZERO 69
    MESSAGE 5 ;where ... />
    [code]

    OPEN DOOR AT 10
    ZERO 69
    zero
    DONE
    [/CODE]

    As ...
    woodcock88 woodcock88 February 2007 Development
  • Features that emulators don't haveI believe most of us use more than one emulator, mainly because there isn't one emulator that has all the features we need or want to use. We also kn…

    ... just for debugging bits of code. But I have a lot ... handy - I suppose breaking on zero t-states would do the ...
    icabod icabod March 2007 Emulators
  • Anybody fancy coding this?blah de blah de blah Please ignore, poting error.

    ... do it.
    [code]
    org 16384
    ent< ...
    EI
    ret
    [/code]
    Use PRINT USR 16384 ... invoke.
    If it prints zero all is OK
    If ...
    Geoff Geoff March 2007 Development
  • TommyGun 0.9.x updates** Should be available via the utilities page soon! Please be patient :-) ** I'll be posting all future updates in this thread, instead of creating …

    ... makes sense:

    [code]
    [ ] OUTPUT PIXEL DATA ... \ bright
    \ flash
    [/code]

    You choose whether ... />
    ABCDEF
    [/code]

    If attribute masking ... are set to zero should zero out corresponding bits ...
    Alcoholics Anonymous Alcoholics Anonymous 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…

    [QUOTE=Winston;179326]My coping mechanism for dealing with so few registers on the 6502 was to liberally use self modifying code. It was pretty awful, not to mention hard to debug![/QUOTE]

    Did you ever find the zero page :D ?
    Alcoholics Anonymous Alcoholics Anonymous March 2007 Development
  • Zombies!!!Anyone around here pay Zombies!!! by twilight creations? I've gone and got myself addicted to it :D

    ... evil
    Resident evil zero
    Resident evil code veronica
    for ...
    mel the bell mel the bell March 2007 Chit chat
  • Bubble Bobble EditI thought I might have a go at editing Bubble Bobble myself after reading this... [url]http://www.worldofspectrum.org/forums/showthread.php?t=15452[…

    [code] COLUMN
    001 002 003 ... 385 386 387 370 371[/code]


    Key
    zero. Column 01 and column 28 ... set those segments.

    [code]
    Levels
    ======
    01 ... 70 6FE1 80 71FF
    [/code]
    Mr. Anonymous Mr. Anonymous April 2007 Development
<1…15161718192021…34>

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