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<1234567…34>
  • SPIN's breakpoints - an overviewAs quite a few people have been asking how to set breakpoints on memory write etc. in SPIN, here's a description of the way the breakpoints work. Get…

    ... how to set breakpoints on memory write etc. in SPIN ... where PC is in memory:
    [code]
    UNTIL A ... reads memory, this can be done like so:
    [code]< ... specify a read from memory. The address needn't ... on its own without checking memory / IO status but ...
    Marko Marko November 2007 Development
  • New Game: Bouncing Bomb - ReduxHi all, I've just finished making a(nother) new Spectrum game "Bouncing Bomb: Redux" It's a remake of my first ever attempt at a machine code game, …

    ...
    attempt at a machine code game, originally made back
    much memory so for fun I filled ... Laker's Airline Capers no memory/code hacking
    is required this ...
    Retroleum Retroleum June 2012 Brand new software
  • Vote for the Timesplitters (if you like great games!)Since it's looking less and less likely that we're going to see a new Timesplitters game ([URL="http://www.edge-online.com/news/free-radical-execs-sl…

    ... , so they wrote for the lowest memory pool (the PS2). With a ...
    ewgf ewgf November 2012 Chit chat
  • 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…

    ... up 5 bytes of memory.


    [code]

    1 ... /> 120 NEXT n

    [/code]


    To come ...
    dmsmith dmsmith April 2020 Sinclair Basic
  • Graphics in Basic??What is the fastest way to draw high rez graphics in Basic. Andrew.

    ... loading UDG's into memory

    [code]
    100 FOR F ... lines ..... e.t.c
    [/code]

    If is send ... and execute the code. If I send to another memory location and ...
    Scottie_uk Scottie_uk October 2006 Development
  • Groundbreaking gamesWhich games really broke new ground? I mean the ones that actually got around the hardware limitations of the Spectrum. For example: Aquaplane - f…

    ... to the slower screen memory.

    Code bitches, feel free to ... correct me if my memory is ...
    Bad Horsey Bad Horsey February 2007 Games
  • Currah MicroSource emulationIt appears to be impossible to emualte the MicroSource in software on the ZX Spectrum SE as hardware polling is required. The following patch is not …

    ... /> This is the complete source code for the paging!
    The ... successive 8K blocks of memory.

    [code]
    .if (bx == 11182 ...
    .endif
    .endif
    [/code]
    Woody Woody March 2007 Emulators
  • Currah MicroSource emulationIt appears to be impossible to emualte the MicroSource in software on the ZX Spectrum SE as hardware polling is required. The following patch is not …

    ... successive 8K blocks of memory.

    [code]
    .if (bx == ... br /> .endif
    .endif
    [/code][/QUOTE]

    This suggests ... use IN/OUT to page memory (in order to perform BASIC ...
    BloodBaz BloodBaz March 2007 Emulators
  • Game Programming Source Code & Startup HelpHi there, I'm planning on porting an existing commercial title to the speccy. I'm in the process of disassembling the original code and commenting i…

    ... storage of sprite data into memory. In order to speed ... instruction to fetch graphics from memory:
    [code]
    ; in HL ... INC L
    ... etc
    [/code]

    - for backgrounds you ... TI calculator developers has great code resource as well.
    ...
    omega omega May 2007 Development
  • DATA BIN - How to read the contentOkay I hit a snag with my Image to ZX Spec program that the plot/draw command eats too much memory. So I want to use DATA BIN to insert converted jp…

    ... hit a few limits - the code above was very early.
    memory!)

    [CODE]FOR C=1TO26:READ ... ,95,100,104:NEXT C[/CODE]

    I'm switching ... bit manipulation libraries and the code already works in stages (scale ...
    brownb2 brownb2 May 2009 Sinclair Basic
  • Fastest Block Drawing Code?Following on from my scrolling thread [URL="http://www.worldofspectrum.org/forums/showthread.php?p=351304#post351304"](http://www.worldofspectrum.org…

    ... at the cost of memory.

    [code][FONT=Courier New] ... byte from previous word.
    [code]
    [FONT=Courier New] ... in the beginning.
    [/FONT][code]
    [FONT=Courier New] ... push de
    ... etc
    [/code]
    [/FONT]Of course, you ...
    omega omega May 2009 Development
  • z80 format: ED ED xx yyI've just been studying the documentation for the z80 file format: [url]http://www.worldofspectrum.org/faq/reference/z80format.htm[/url] I have a d…

    ... br /> sys.stderr.write("ERROR: Memory size is %i\n" % ... />
    [code]import zxlib

    header, memory = zxlib.get_snapshot('some ... :34] = [0, 128]
    # memory[30464] = 201

    zxlib ... ('some-other.z80', header, memory)
    [/code]
    SkoolKid SkoolKid July 2009 Development
  • some debugger in emulators that is able to brakpoint when a mem address is accessed ?Is there a debugger (disassembler) available in some emulator that is able to stop (breakpoint) when a particular memory address is accessed ? For e…

    ... how to set breakpoints on memory write etc. in SPIN ... where PC is in memory:
    Code:
    UNTIL A= ... reads memory, this can be done like so:
    Code:< ... specify a read from memory. The address needn't ... on its own without checking memory / IO status but ...
    Ralf Ralf November 2009 Emulators
  • Z80 assemblerIf I do this [code] LD BC, 0002h [/code] is B=0 and C=2, or the other way around? does it disassemble to 01 00 02 does it disassemble to 01 02 00

    ... order, but in the core memory it's saved the other ... -byte quantities are stored in memory. There are two ways to ... $02 is stored in the lowest memory location and the most siginificant ... stored at the next higher memory location. So LD BC,$0002 ...
    Alcoholics Anonymous Alcoholics Anonymous December 2009 Chit chat
  • Spectrum 128K RS232 to PC serial cableIf you have read some of my recent posts then you will know that I am eager to link my Spectrum +3 to a PC. This will be done by wiring a standard PC…

    ... exactly 512 BYTES of memory:

    [code]
    ; --------------------------------------------------------------------------


    ASM ASM November 2010 Hardware
  • BASIC Listing for loading screens then gameCould someone explain the code required to load a screen image followed by the game file please? I've lost my notes on loading the game (which I thin…

    From memory

    [code]
    [COLOR="Navy"]1 REM ... need to be changed to [code]LOAD "" CODE[/code]

    once ... the following argument [code]SAVE "whatevername" LINE 1[/code]

    wow....now thats a trip down memory ...
    Zetr0 Zetr0 March 2011 Development
  • 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…

    ... br />
    [CODE]
    ; =================================================================================================
    ... MEM_KEYS is a memory slot with enough ... key in memory
    [/CODE]
    ... CODE]
    ld hl,MEM_KEYS ; 10t - this is the memory ...
    TomD TomD April 2011 Development
  • What paging scheme is the "standard" for 128K models?Sinclair implemented an arrangement so that even numbered pages are non-contended, and odd numbered pages are contended (quoting from memory, haven't…

    ... the opcodes I know from memory)
    [code]10 DATA 118,175 ... ,211,254,195,0,128[/code]

    Which translates ... to:
    [code] org 32768
    loop: halt ... (254),a
    jp loop[/code]

    Gives me ...
    mcleod_ideafix mcleod_ideafix November 2011 Hardware
  • ZX7: an "optimal" LZ77 packerAbout 20 years ago, I started a M.Sc. in Computing, planning to work on data compression. Although I quickly changed to another subject for a number …

    ... br />
    [code]
    TOP OF MEMORY
    [ZX7 decompressor] ... ; 10K
    BEGINNING OF MEMORY
    [/code]

    When ... ; 10K
    BEGINNING OF MEMORY
    [/code]

    After ... ; 40K
    BEGINNING OF MEMORY
    [/code]

    This ...
    Einar Saukas Einar Saukas January 2013 Brand new software
  • ZX7: an "optimal" LZ77 packerAbout 20 years ago, I started a M.Sc. in Computing, planning to work on data compression. Although I quickly changed to another subject for a number …

    ... what I mean:
    [CODE]TOP OF MEMORY

    +-end of ... data -+

    BEGINNING OF MEMORY[/CODE]

    Unfortunately the current ...
    Einar Saukas Einar Saukas March 2013 Brand new software
  • 30-column 8x2 multicolor (even in 48K)I don't recall any 8x2 multicolor routine for 30 columns that would work on all Spectrum models (including the Spectrum 48K), so I decided to write i…

    ... multicolor 8x1 from contended memory:

    [CODE] ; 15905T
    LD SP ... /> ; 16125T
    NOP
    ; 16129T[/CODE]

    I also tried ...
    Einar Saukas Einar Saukas August 2013 Development
  • Converting Basic code into machine codeIm just interested to know if I can converter a game I've written in basic into Machine code, Is their a program that can do this??

    ... optimise speed of copying memory:
    [CODE]ink 0:paper 7:cls ... /> ldir
    end asm
    [/CODE]
    You can not only ...
    LCD LCD September 2013 Development
  • Read Data from memoryHi there. Not been on this scene for a long time. Does anyone know how to do a routine to read data from memory(peek..etc) rather than using lines of…

    ... fastcalled instruction to copy memory.
    if you ... can try this to copy memory:
    [CODE]
    DI
    RET
    [/CODE]
    in Sinclair BASIC use ... this:
    [CODE]
    For a=0 ... /> Next a
    [/CODE]
    Note the parenthysis, ...
    LCD LCD May 2014 Sinclair Basic
  • Read Data from memoryHi there. Not been on this scene for a long time. Does anyone know how to do a routine to read data from memory(peek..etc) rather than using lines of…

    ... fastcalled instruction to copy memory.
    if you ... can try this to copy memory:
    [CODE]
    DI
    RET
    [/CODE]
    in Sinclair BASIC use ... this:
    [CODE]
    For a=0 ... /> Next a
    [/CODE]
    Note the parenthysis, ...
    davepierce07 davepierce07 May 2014 Sinclair Basic
  • UDG tricks?I always enjoyed using [URL="http://www.worldofspectrum.org/ZXBasicManual/zxmanchap14.html"]UDGs [/URL]for the 'sprites' in my games, when I coded th…

    ... can point to anywhere in memory. The high byte of this ... do:
    [CODE]
    CLEAR 65111
    [/CODE]
    This is ... interpreter to leave the upper memory alone. This value is 65367 ... bytes lower in memory:
    [CODE]POKE 23676,254[/CODE]

    ...
    joefish joefish June 2014 Sinclair Basic
<1234567…34>

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