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<1…15161718192021…34>
  • Structure of numeric arraysHi all, I have saved from my spectrum a numeric array using 'SAVE "array" DATA a()'. I now have the resulting file on my PC and I am trying to get …

    ... that the first bit of byte 2 is the sign (0 ... =negative) and the remainder of byte 2, and bytes 3 to ... point.

    The first byte is the exponent and the ... /> The exponent is therefore 3 decimal and the number is
    Geoff Geoff September 2011 Development
  • Where to start?..Hello, First off, sorry if this is in the wrong and sorry if the questions I'm about to ask have been asked and answered numerous time! Little back…

    ... up some moolah and just print out that info for my ... ;564533]The 'XX' represents a byte of data. So if the ... -bit number, with the low byte first. The fiddly ones are ... /IY offset instructions, where the byte is treated as a signed ...
    ZnorXman ZnorXman September 2011 Development
  • Keys redefine routine and key check.I have written some asm code which allows me to redefine keys (for a game etc.), and also allows me to be able to check any keypresses for the redefi…

    ... address back
    ;call pm_do_it ; print the message
    ;ret
    byte
    ld (hl),a ; ... save the pattern byte
    dec hl ; go ... back to the key_xxx_port byte
    ld a,(de) ; ...
    polomint polomint September 2011 Development
  • Tile based graphics and scrolling thingy...Here's my best attempt so far at a tile based rendering and scrolling routine. It draws in 22 8*8 graphics tiles along the top of the screen (junk i…

    ... draw_tile_bytes ld a,(de) ; Get byte... (7)
    ld (hl), ... ld (hl),a ; ... draw last byte here


    ... /> ld (position_var),hl ; Reset print position

    ret< ... ; Using LDI, 16 ticks per byte * 22 = 352
    ...
    R-Tape R-Tape September 2011 Development
  • Tile based graphics and scrolling thingy...Here's my best attempt so far at a tile based rendering and scrolling routine. It draws in 22 8*8 graphics tiles along the top of the screen (junk i…

    ... tile_line_loop push de ; Store current print position
    push hl ; ... draw_tile_bytes ld a,(hl) ; Get byte...
    ld (de),a ; ... inc l ; Point to next byte of source tile data
    Einar Saukas Einar Saukas September 2011 Development
  • Tile based graphics and scrolling thingy...Here's my best attempt so far at a tile based rendering and scrolling routine. It draws in 22 8*8 graphics tiles along the top of the screen (junk i…

    ... ld e,1 ; Initial print position
    tile_line_loop ld ... ld a,(hl) ; Get byte...
    ld (de),a ... br /> inc e ; Next byte
    djnz tile_line_loop ; ...
    Metalbrain Metalbrain September 2011 Development
  • saving part of a BASIC programHere's a short routine to save part of a BASIC program. The idea is that it can be merged into a program and then used to save sub-routines, etc. to …

    ... /> IF f$(k1)=" " THEN
    PRINT #k0;"F Invalid file name ...
    Battle Bunny Battle Bunny September 2011 Sinclair Basic
  • MCODE problem...Hi Folks, Trying to write a simple machine code program to hatch the screen. So far I have the following but even this is not working - it does not…

    ... [/I]is doing a 7 byte forward jump, you need to ... do a 6 byte backward jump (ie a minus ... 256-7 i.e. 249 decimal.

    All by hand ...
    Paddy Coleman Paddy Coleman October 2011 Development
  • MCODE problem...Hi Folks, Trying to write a simple machine code program to hatch the screen. So far I have the following but even this is not working - it does not…

    Also....
    Z80 is low byte first, therefore LD HL, 16384 ( ... this
    [code]
    HEX DECIMAL CODE
    21 00 40 ...
    BloodBaz BloodBaz October 2011 Development
  • Need help with tzxingI recently got a copy of this Polish text game: [url]http://www.worldofspectrum.org/infoseekid.cgi?id=0006622[/url] I can't make a tzx of it howeve…

    I see what it's doing now. The hidden 5-byte number behind the RANDOMIZE USR 0 is decimal 23798, hence the jump to the m/code in the first line. Can't get it to load beyond the SCREEN$ though.
    Battle Bunny Battle Bunny October 2011 MIA/STP/SDP
  • Dead Spectrum SocietySo I'm getting back into real Sinclair computers rather than emulators. During the summer months I was lucky enough to buy a working ZX81 and was giv…

    ... ) memory with value 00100010b (34 decimal), and resulted in this:
    byte from the contended memory bank ...
    mcleod_ideafix mcleod_ideafix October 2011 Hardware
  • Auto generated spritesLooking around for some graphics I came across [url]http://blog.disktree.net/?p=19[/url] , one of several such pages. Need the odd 8x8 UDG or two (…

    ... F=1 TO 8: PRINT
    ;; 20 PRINT F;"= ";CHR$(143+F ... ;reducing it to one 8bit byte to save data...
    < ... br /> LD A,D ; Plonk Byte to be reversed in A ... />
    LD A,E ; Plonk Byte to be reversed in A ...
    kgmcneil kgmcneil October 2011 Development
  • SP1 and memoryWhile developing my program, I've run into memory related issues and haven't (yet) run into any advice over how SP1 uses memory. The examples all sb…

    ... addition, malloc has a two byte overhead for each allocated block ... is not needed is to print as tiles at character coordinates ...
    Alcoholics Anonymous Alcoholics Anonymous October 2011 Development
  • Requesting a little help to identify the purpose of this 'add-on' to my Issue 2Hi everyone First of all it's my first post here so please go easy on me! I'm grateful to be accepted into your fine little club :smile: I probabl…

    ... the following results from a PRINT USR 30000

    32768 ... providing 1 bit of the byte requested by the cpu. Is ...
    cmonkey cmonkey October 2011 Hardware
  • Requesting a little help to identify the purpose of this 'add-on' to my Issue 2Hi everyone First of all it's my first post here so please go easy on me! I'm grateful to be accepted into your fine little club :smile: I probabl…

    ... 'd back. For all 256 byte values, chances are you'll ... (say, 0 and 255) and print the PEEKs of same address ...
    RetroTechie RetroTechie October 2011 Hardware
  • probably a stupid question about RST16I'm using the 'hello world' code borrowed from [url=http://equant-retrochallenge.blogspot.com/2008/07/zx-spectrum-assembly-programming-under.html]her…

    ... thought of that scenario with PRINT AT, but it didn't ... . My homegrown replacement pulls the byte pair following a 22 to ...
    sack sack October 2011 Development
  • New WIP underway - 'Dingo'.Hi, Prepare for a long post. Perhaps I can even challenge ewgf here. :razz: Anyway, I've been meaning to get into Z80 programming and making a game…

    ... ; all routines set the keyretval byte as shown in definekeys.asm ... back
    ;call pm_do_it ; print the message
    ;ret
    byte
    ld (hl),a ; ... ; go back to the key_xxx_port byte
    ld a,(de) ; ...
    polomint polomint October 2011 Development
  • which zx-spectrum games uses 1bit sound samples?hi! I'm looking for zx-spectrum games using 1bit sound samples. Compairing with msx, which has far less games available than zx-spectrum, there are f…

    ... how it is coded), each byte containing four 2-bit samples ... been run, so just do PRINT USR 65250 to have it ...
    PrinceGaz PrinceGaz October 2011 Games
  • Krakatoa not workingI can't get any of the Krakatoa files in the archive to load on spin or zxds. Anyone else had this problem?

    ... you'll get those 33-byte long blocks (notice that the ... middle one has one more byte).

    The loader for ... ,5B41 ;Tape Loading error: Beep, print error, wait for key, beep ...
    lfaria lfaria October 2011 Games
  • which zx-spectrum games uses 1bit sound samples?hi! I'm looking for zx-spectrum games using 1bit sound samples. Compairing with msx, which has far less games available than zx-spectrum, there are f…

    ... two 3-bit samples per byte, but as Spectrum memory is ... , meaning some samples overlap a byte-boundary.

    The end ... ]

    As usual, enter PRINT USR 65260
    PrinceGaz PrinceGaz November 2011 Games
  • Newbie says 'Alreet?'Hiya dudes, Just dropping a line to say hello as i've decided at 33 to try and fulfill a long time ambition to write a speccy game in machine code..…

    ... by 'mask bits for high byte' Why does he need to ... pixel, 8 pixels in a byte.

    The 32x24 attribute ... is a colour overlay, one byte per character square and occupies ... doing now. His use of decimal makes it more difficult to ...
    Alcoholics Anonymous Alcoholics Anonymous November 2011 Development
  • how can we convert .z80 to .tap ?is there some way to convert a .z80 file (specially 48k) to .tap, in a similar result as saved from Multiface1? (i'm asking this because i imagine th…

    ... missing leading quote in a PRINT; this causes the "Variable not ... also makes the BASIC one byte shorter than expected, but the ... have not taken the missing byte into account, so the VARS ... pointer is set one byte too high. So typing RANDOMIZE ...
    Battle Bunny Battle Bunny November 2011 Development
  • Up/Down Left/Right scrollCan anybody give a newbie some pointer to simple one char scrolling by pixel? I've looked at a lot of resources, but as you can imagine, it's all a …

    ... and moving to the next byte
    ;along - which ... br /> ;holding one byte MORE than it should since ... Spectrum are...little 8 byte blocks of characters just ... br /> ;I take one byte of sprite data.....
    ... basically one character just like PRINT....or RST 16)
    Turkwel Turkwel November 2011 Development
  • What memory address?If you poke 96 and 236 what would the memory address be? I've forgot how to work it out!!! :-?

    ... is the problem with using decimal numbers for coding :)

    byte and 68 in the other ...
    guesser guesser November 2011 Sinclair Miscellaneous
  • Auto generated spritesLooking around for some graphics I came across [url]http://blog.disktree.net/?p=19[/url] , one of several such pages. Need the odd 8x8 UDG or two (…

    ... , one key press per byte. Pain in the arse?< ... that's 10 udgs made, print & return
    ld ... right hand side of the byte
    push af ; ... pop af
    or c ;byte now symmetrical
    ld (hl ... /> inc hl ;ready for next byte
    ret
    ;
    R-Tape R-Tape December 2011 Development
  • Good games with crappy artworkWhich games do you think were let down by scraggy box art? My example is Heavy On The Magick. Great game but that art is abysmal. Look closely, Its a…

    ... =Arjun;586890]Manic Miner (Bug Byte):
    [URL="ftp://ftp.worldofspectrum ... it would of been a print of the BugByte cover i ...
    jammajup jammajup December 2011 Games
  • Calculating percentage..or even calculating percentage. Maths and asm I find verryyy tricky. Can anyone suggest the easiest/best way to calculate a percentage from two 1…

    ... INT (RND*500)
    40 PRINT o;": ";dividend;" is ";USR ... nc,OPTION3
    OPTION1:;just print the answer
    call $ ... answer as a string and print the string
    call ... add hl,bc ;+6 = 1st byte after 'a'
    call $2b59 ...
    Battle Bunny Battle Bunny December 2011 Development
  • Screen routinesHello. For my games I?m using the sprites routine method of a screen buffer and when I finish to print all the sprites I dump all the buffer in the …

    ... frame to frame. If you print a new background character to ... therefore drawn to an 8-byte block at *fixed* address. This ... spent in copying the 8-byte buffer to screen is small ... only has to write one byte to cause a change to ...
    Alcoholics Anonymous Alcoholics Anonymous January 2012 Development
  • Screen routinesHello. For my games I?m using the sprites routine method of a screen buffer and when I finish to print all the sprites I dump all the buffer in the …

    ... frame to frame. If you print a new background character to ... therefore drawn to an 8-byte block at *fixed* address. This ... spent in copying the 8-byte buffer to screen is small ... only has to write one byte to cause a change to ...
    climacus climacus January 2012 Development
  • Creating a new game - AssemblySo... finally I?m studying Assembly Z80... after 36 years. :) Well... it?s sooooooooooooo hard to make a game using Assembly? I bought a book (Spectr…

    ... I was when after entering PRINT PEEK 25000 I read 56 ... significant and the least significant byte, something which had me puzzled ...
    Alessandro Grussu Alessandro Grussu January 2012 Development
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Latest Posts

  • I am currently watching.....
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