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  • Fastest way to clear a screen.We haven't had an optimizing fun for some time, so let's have some: What's the fastest way to clear a screen (i.e., filling the 6912 bytes at 16384 w…

    ... 3 byte CALL of ROM routine.

    To fill whole ... without using ROM routines - 8 bytes (but it also erases part ... you say it's 8 bytes? I think you need additional ...
    baze baze February 2009 Development
  • MultichromeIt turns out that multichrome, and other screen modes, are emulated in Fuse and Eightyone via ZX Spectrum SE emulation (which is similar to the TC214…

    ... only need to set 32 bytes of attr data per line ... . We use our cleverly timed routine to set the attrs to ... and we use our clever routine again to set the odd ... using a raster bar style routine to change the attributes on ...
    evilpaul evilpaul February 2009 Development
  • 1K Minigame : 3D RacerLast year I started to code a 3D Racer in 1K. The print of the road was however quite flickery so I put it away to pick it up this week again. I deve…

    ... a routine that can play a tune in just 74 bytes, already ...
    Dr BEEP Dr BEEP February 2009 Games
  • 1K Minigame : 3D RacerLast year I started to code a 3D Racer in 1K. The print of the road was however quite flickery so I put it away to pick it up this week again. I deve…

    ... /> The size is now 1012 bytes.

    I needed some ... bytes to solve the bugs.
    ... so I added
    a routine to copy the code into ... .

    So with 12 bytes left I don't know ...
    Dr BEEP Dr BEEP February 2009 Games
  • Playing 128k music with z88dk ?Hi, I'm amazed how easy seems to make things with z88dk to build spectrum asm programs. After my first approach I miss some way to play 128k music, s…

    ... registers (if the music routine doesn't do it itself ... necessary if the music routine label is not in this ... vector table with all 0xd4 bytes
    bpoke(0xd4d4, 195); ... at address 0xd4d4 (interrupt service routine entry)
    wpoke(0xd4d5, ...
    Alcoholics Anonymous Alcoholics Anonymous February 2009 Development
  • Interrupts - been a while !Not sure if this is the right place for this (1st post on WOS, but been a speccy user since Dec'84 :-o (yes I am that old ! :p) ), But I can't for …

    ... : equ 0xfdfd ; jp interrupts 3 bytes at this addrs

    ; hl = interrupt routine address
    ; ints enabled on ...
    frobush frobush March 2009 Sinclair Miscellaneous
  • AY tracker routineHi. Yesterday i played with some ay tracks and was surprised how big are tracker routines and music data (over 1.5KB for Pro Tracker routine and 4-6 …

    ... make a sweet sounding tracker routine in the first place.. but ... only a couple of hundred bytes long when compressed, and the ...
    evilpaul evilpaul March 2009 Development
  • 2 commands in 1 lineHi all, this is my first post although I have visited the web site many times, and I find it great. English is not my mother tongue, so I will try to…

    ... position 16384 and takes 30766 bytes. As far as I understand ... jumps to the LOAD system routine, which loads the screen, the ... jumps to the SAVE system routine but it seems that before ...
    rinconete rinconete March 2009 Sinclair Basic
  • 2 commands in 1 lineHi all, this is my first post although I have visited the web site many times, and I find it great. English is not my mother tongue, so I will try to…

    ... /> The data block takes 30766 bytes, therefore the first available position ... listing by calling the system routine LIST ($17F9) just after CALL ...
    rinconete rinconete March 2009 Sinclair Basic
  • Detecting Spectrum modelsIs there any sure-fire way a program can detect the model of machine it's running on (48K, +, 128, +2, +2A, +3, clones) even when running in the 48K …

    ... stack just few tens of bytes above screen.

    another ... keyboard was disabled, the menu routine was reading both of keyboard ...
    Fikee Fikee March 2009 Development
  • Data bus at interrupt timeIt is "well known" that some peripherals can put values other than 0xff on the data bus at interrupt time, thus meaning that IM2 is slightly more fid…

    ... 257 bytes of the im2 vector table. The interrupt service routine called ...
    Jimmy Jimmy March 2009 Hardware
  • TZX SuitabilityHi All, Firstly thanks for a wealth of info been a long time since Ive seen those set of rubber keys and symbol-shift and now it back around and we d…

    ... bytes from the blocks you need to essentially run the loading routine ...
    Fred Fred March 2009 MIA/STP/SDP
  • TZX SuitabilityHi All, Firstly thanks for a wealth of info been a long time since Ive seen those set of rubber keys and symbol-shift and now it back around and we d…

    ... in line run length compressing routine![/QUOTE]

    You are ... game). The analysed bits and bytes will of course be the ...
    Fred Fred March 2009 MIA/STP/SDP
  • 1K Minigame : 3D RacerLast year I started to code a 3D Racer in 1K. The print of the road was however quite flickery so I put it away to pick it up this week again. I deve…

    ... />
    I altered the drawing routine where the road is now ... effect.
    (costet me 14 bytes and I only had room ... change some code in lesser bytes)

    Tell me what ...
    Dr BEEP Dr BEEP March 2009 Games
  • TZX SuitabilityHi All, Firstly thanks for a wealth of info been a long time since Ive seen those set of rubber keys and symbol-shift and now it back around and we d…

    ... byte data (the bytes seen by the spectrum loader routine) the TAP ... which file type, if these bytes exist in this order at ... as long as the orginal bytes are there.. which they have ... " are having trouble extracing the bytes then it will be the ...
    Richard_Butler Richard_Butler March 2009 MIA/STP/SDP
  • How old is retro?In the thread: [URL]http://www.worldofspectrum.org/forums/showthread.php?t=24327[/URL] the age old question of "[I]How old does a computer/console …

    ... to write a LDIR routine in two bytes (Phil K., Dunny, and ...
    ewgf ewgf April 2009 Chit chat
  • New game: Nanako Descends to HellJust a bit over two weeks after their first game, The Mojon Twins strikes again with a new game for Spectrum 128k and Amstrad CPC: [url]http://www.m…

    ... be sizeof(code) + #bytes needed for the function address ... vector table with all 0xf1 bytes
    bpoke(0xf1f1, 195); ... at address 0xf1f1 (interrupt service routine entry)
    wpoke(0xf1f2, ... vector table with all 0xf1 bytes
    bpoke(0xf1f1, 195); ...
    Alcoholics Anonymous Alcoholics Anonymous April 2009 Games
  • RLE source codeI'm considering tweaking my Des Des loader to cope with on the fly decompression (yeah I'm bored) I was wondering if anybody out there had a very ba…

    ... with the regular speccy save routine, and pull it back onboard ... run length values for repeated bytes.

    After that works ... ) I would consider a save routine that has longer pulses to ... to the number of repeated bytes which are currently being written ...
    Kilby Kilby April 2009 Development
  • Give me your Minigame ideas...I am working on a new MiniGame as I write this. It is a combined version of Snake and Bingo. On a full screen at the start the numbers 1 to 30 are …

    ... is constant untill the depacking routine changes the first letter with ... letter.

    The depacking routine starts at A then the ... A and the next two bytes complete the word.
    Same ... I only need 2 * 100 bytes to store the next 100 ...
    Dr BEEP Dr BEEP April 2009 Development
  • Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …

    ... left the default system interrupt routine running, so every 1/50 ... forward or back by 127 bytes. It also means you can ...
    joefish joefish April 2009 Development
  • Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …

    ... again, it moves down 2 bytes and stores that.
    When ... HL to DE. In this routine, it's used to save ... stack too. Whenever an interrupt routine is called, or someone uses ... stuff within your own interrupt routine anyway.
    joefish joefish April 2009 Development
  • Simple text compressionI just checked one idea about text compression. Do not take it as recomendation but rather as info which can you save some time when you are solving …

    ... character.

    Routine is just 128 bytes long (inc. internal vars ... call to the Decoders "Initialize" routine allows you to point to ...
    BloodBaz BloodBaz May 2009 Development
  • Tape and Disk breakpointsIs it possible to set a breakpoint on a .TAP, .TZX or .DSK file so that the debugger pops up when loading finishes? I'm talking about a breakpoint wi…

    ... loaders, code blocks with 49152 bytes and auto-run, anti-merge ... sometimes a small m.c. routine will be needed to load ...
    zxbruno zxbruno May 2009 Emulators
  • Tape and Disk breakpointsIs it possible to set a breakpoint on a .TAP, .TZX or .DSK file so that the debugger pops up when loading finishes? I'm talking about a breakpoint wi…

    ... loaders, code blocks with 49152 bytes and auto-run, anti-merge ... sometimes a small m.c. routine will be needed to load ... just create a small LDIR routine to copy from one memory ...
    LCD LCD May 2009 Emulators
  • 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…

    ... (e.g. "10" = 2 bytes, ASCII style), followed by a ... number which consumes another 5 bytes.

    This ... 10, 20, 30 consumes 27 bytes instead of (say) 3. ... bytes per number). Yes, you will need to write a routine ... pixel graphic with 3 bytes per pixel (R/G ...
    BloodBaz BloodBaz May 2009 Sinclair Basic
  • Brand new River Raid remake?one of my friend is trying to make a riverraid remake on flash just to have fun, I checked zx spectrum port of river raid. it is bad, really bad, jer…

    ... around 5K for the interrupt routine to do everything in one ... wil end with simple moving bytes from table. also remebere that ... never seen the multicolor draw routine, perhaps you could check it ...
    Fikee Fikee May 2009 New game ideas
  • Rainbow Generator for 48K Spectrum using PUSHThis is what I came up with from [B]gasman[/B]'s suggestions. It's stable in ZXSpin and ZX32 simulating a 48K Speccy. Anyone like to try it on the …

    ... equ 0x0adc ; position store routine
    report_j equ 0x15c4 ... ; null input routine
    make_room equ 0x1655 ... ; create buffer routine
    strms equ 0x5c10 ... 5 bytes
    call make_room ; call the MAKE_ROOM routine
    chev chev May 2009 Development
  • River Raid Tech DemoJust a little something to look at. Enjoy. [URL="http://www.joefish.co.uk/speccy/Joefish_River_Raid_Tech_Demo_01.tap"]Joefish_River_Raid_Tech_Demo_…

    ... to see is the display routine.

    We could make ... buffer where you set the bytes how to display on the ... ) and then call a default routine which would make the display ...
    Dr BEEP Dr BEEP May 2009 Development
  • River Raid Tech DemoJust a little something to look at. Enjoy. [URL="http://www.joefish.co.uk/speccy/Joefish_River_Raid_Tech_Demo_01.tap"]Joefish_River_Raid_Tech_Demo_…

    ... routine.
    We could make a buffer where you set the bytes ... ) and then call a default routine which would make the display ... 's not quite the same routine. The one I listed there ...
    joefish joefish May 2009 Development
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Latest Posts

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