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<1234567…34>
  • Textured Scanline Flood Fill for ZX Spectrum 48KPity that it's quite hard to contribute code to WoS in a straightforward manner. Recently, I have created a textured/hatched fill M/C routine for the…

    ... [/url] that I pimped a bit to support textures and color ...
    Volker Volker February 2021 Software
  • Proportional Print Routine...Hi Folks, Does anyone know of a good proportional printing routine for the ZX Spectrum? Ideally I am looking for something that prints with charact…

    ... proportional printing function is to calculate the length of a string ... , the "width" seems to be bit mask rather than the value.
    bit that I am trying to ...
    Paddy Coleman Paddy Coleman May 2011 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…

    ... hl 60006 E5

    ; calculate bit position of pixel

    ret 60059 C9

    ; calculate the pixel address and whether ... /> inc c 60096 0C
    bit 2,c 60097 CB 51 ...
    Paddy Coleman Paddy Coleman August 2017 Development
  • line routineWondered if anyone can help me out. I have been programming a 3d graphics library for the spectrum, in Machine code. The line routine that I have i…

    ... can work directly with the bit mask in the line routine instead ... 's faster to rotate a bit mask or to fetch it from ... be better to build full mask of say 3 bits before ...
    Mikie Mikie October 2001 Sinclair Miscellaneous
  • Anyone familiar with ZEXALLZEXALL is a Z80 exerciser, and there's a build for the Spectrum. But oddly, it doesn't actually work on any of the emulators that I've tried. Exactly…

    ... the source mention of a bit mask for the flags - so it ...
    Dunny Dunny April 2003 Emulators
  • z88dk+splib2 sprites question.I'm creating a game and I have several "states" for my main sprite, such as jump, facing left, facing right, etcetera. All those states require a dif…

    ... /> ; a = next bit in de to write to (bit mask)
    ; exit ... /> ; c = next bit in hl to write to (bit mask)
    ; uses ... de's byte to interpret (bit mask)
    ; exit : a = ... srl c ; move mask right one bit
    jp nc, ...
    Alcoholics Anonymous Alcoholics Anonymous October 2005 Development
  • Sprite DesignerDoes anybody know of a good sprite-designer package? The game I'm currently working on is requireing a lot of sprites, and coding them all as binary…

    ... mask into the bitmap data (so a line would be 8-bit ... graphic, 8-bit mask, 8-bit graphic, 8-bit mask and so ...
    bobs bobs January 2006 Development
  • Sprite DesignerDoes anybody know of a good sprite-designer package? The game I'm currently working on is requireing a lot of sprites, and coding them all as binary…

    ... mask into the bitmap data (so a line would be 8-bit ... graphic, 8-bit mask, 8-bit graphic, 8-bit mask and so ... be able to interleave the mask into the bitmap data using ... SevenuP, just move mask to the top of the ...
    jonathan jonathan January 2006 Development
  • Sprite DesignerDoes anybody know of a good sprite-designer package? The game I'm currently working on is requireing a lot of sprites, and coding them all as binary…

    ... mask into the bitmap data (so a line would be 8-bit ... graphic, 8-bit mask, 8-bit graphic, 8-bit mask and ... able to interleave the mask into the bitmap data ... SevenuP, just move mask to the top of ... graphic data before mask data, untick the "Mask Before Graph" ...
    Metalbrain Metalbrain January 2006 Development
  • Sprite DesignerDoes anybody know of a good sprite-designer package? The game I'm currently working on is requireing a lot of sprites, and coding them all as binary…

    ... format was
    8 bit gfx, 8 bit mask, ..., then attributes.
    In ...
    Kiwi Kiwi January 2006 Development
  • 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…

    ... . These take a 16-bit scancode or an array of ... five 16-bit scancodes respectively and check ... scancode is just the 8-bit keyboard row in the ... the keyboard and a 5-bit mask for a specific key in ... input and returns a 16-bit scancode indicating how to ...
    Alcoholics Anonymous Alcoholics Anonymous April 2007 Development
  • How does interrupts work?I am a little confused regarding the interrupts on the Spectrum. If I have some hundred bytes of machine code started with, say, [B]RANDOMIZE USR 300…

    ... 5 (keyboard row, return value bit mask) values and execute something like ...
    Alcoholics Anonymous Alcoholics Anonymous May 2007 Development
  • Bit 3 And Bit 5 Of The Flag RegisterHi, I know that bits 3 and 5 are "undocumented" but does anyone know where I can find data on how they are handled? For instance, it would seem th…

    ... for instructions that manipulate 8-bit numbers but I'm not ... implement them when manipulating 16-bit numbers.

    For instance ... .

    My 'calculate bit 3' routine simply sets bit 3 of the ... the last 8-bit result calculated (same for bit 5) but I ...
    MadDoc MadDoc June 2008 Emulators
  • Bit 3 And Bit 5 Of The Flag RegisterHi, I know that bits 3 and 5 are "undocumented" but does anyone know where I can find data on how they are handled? For instance, it would seem th…

    ... 281989]
    My 'calculate bit 3' routine simply sets bit 3 of the ... to the same value as bit 3 in the last ... 8-bit result calculated (same for bit 5) but I ... t figure out which 8-bit value to use when ... adding to the 16-bit HL register pair. Do ...
    BloodBaz BloodBaz July 2008 Emulators
  • Skool Daze disassemblyWhile developing [url="http://pyskool.wordpress.com/"]Pyskool[/url], I've also been putting together a disassembly of Skool Daze and Back to Skool, m…

    [QUOTE=Jmk;318064]Does it calculate the AND mask or store it?[/QUOTE ... masks. (Is it possible to calculate a mask?)

    Back to ... tiles (362 regular tiles + 362 mask tiles)
    1536 bytes for ...
    SkoolKid SkoolKid November 2008 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 …

    ... : [I](word = 2 bytes/16 bit value)[/I]

    [code ... :
    ; Branch Node: read next bit (into A) to determine next ... />

    ; Move to next bit
    RR C
    JR ... /> CursorMsk: .byte 0 ; Bit mask position (a single 1 bit moves to right ...
    BloodBaz BloodBaz May 2009 Development
  • Vote for your favourite loading border colourSo it is time for one more important voting! :razz: What is your favourite loading [B]border[/B] design? Since I guess most of us spent many many ho…

    ... colour, or even a priority bit (selectable by some I/O ... is, 1 bit plane graphic data and 1 bit mask. It would be ...
    Madonna Mk 2 Madonna Mk 2 August 2009 Games
  • Vote for your favourite loading border colourSo it is time for one more important voting! :razz: What is your favourite loading [B]border[/B] design? Since I guess most of us spent many many ho…

    ... is, 1 bit plane graphic data and 1 bit mask. It would be ...
    chev chev August 2009 Games
  • Z80 compressorIs there one available? Is it any good? Peeps have been suggesting we should look into this, so here's a new thread! I'd do the compressor on the …

    ... de's byte to interpret (bit mask)
    ; exit : a = ... srl c ; move mask right one bit
    jp nc, ... /> ; a = next bit in de to write to (bit mask)
    ; exit ... /> ; c = next bit in hl to write to (bit mask)
    ; uses ...
    Alcoholics Anonymous Alcoholics Anonymous February 2010 Development
  • 'Hello World' in ASM ?Can someone show how to make the classic 'Hello World' print with ASM code ? I cant figure at this moment how to insert and handle strings with the s…

    ... rrca

    and 224 ; Bit-mask 11100000 in binary
    ; Throw ... d
    and 24 ; Bit-mask 00011000
    add a, 64 ... the data to a 16-bit register
    ld h ... it to make it a bit quicker, for example:
    bit register
    ld h ...
    ajmoss ajmoss June 2010 Sinclair Basic
  • A question about M1 cyclesI'm writing an interrupt routine that, after the usual register pushes, will jump to a location of my choice with a [b]JP (IY)[/b] instruction. If I…

    ... , I'll need to pre-calculate bit-shifts of my graphics. I ... 'll put the bit-shifts for the bank 5 ... ) in bank 0, and the bit-shifts for the bank 7 ...
    ajmoss ajmoss July 2010 Development
  • Z80 Machine Code Question...Hi Folks, I know not strictly a BASIC question but I have started to learn Z80 machine code - 25 years too late! :smile: I have been reading a book…

    ... 210040
    LD A,85d ; Bit mask 3E55
    LD B,8d ... /> LOOP LD (HL),A ; POKE bit to screen 77
    INC ...
    Paddy Coleman Paddy Coleman August 2010 Sinclair Basic
  • Z80 Machine Code Question...Hi Folks, I know not strictly a BASIC question but I have started to learn Z80 machine code - 25 years too late! :smile: I have been reading a book…

    ... 210040
    LD A,85d ; Bit mask 3E55
    LD B,8d ... /> LOOP LD (HL),A ; POKE bit to screen 77
    INC ... ... as bobs says, it is bit overcomplicated, but don't mind ...
    Fikee Fikee August 2010 Sinclair Basic
  • Z80 Machine Code Question...Hi Folks, I know not strictly a BASIC question but I have started to learn Z80 machine code - 25 years too late! :smile: I have been reading a book…

    ... 210040
    LD A,85d ; Bit mask 3E55
    LD B,8d ... /> FORA LD (HL),A ; POKE bit to screen 77
    INC ...
    Paddy Coleman Paddy Coleman August 2010 Sinclair Basic
  • Z80 Machine Code Question...Hi Folks, I know not strictly a BASIC question but I have started to learn Z80 machine code - 25 years too late! :smile: I have been reading a book…

    ... 210040
    LD A,85d ; Bit mask 3E55
    LD B,8d ... /> FORA LD (HL),A ; POKE bit to screen 77
    INC ...
    Fikee Fikee August 2010 Sinclair Basic
  • Z80 Machine Code Question...Hi Folks, I know not strictly a BASIC question but I have started to learn Z80 machine code - 25 years too late! :smile: I have been reading a book…

    ...
    120 LD A,85d ; Bit mask 3E55
    130 LD B ... /> 160 LD (HL),A ; POKE bit to screen 77
    170 ...
    Paddy Coleman Paddy Coleman August 2010 Sinclair Basic
  • 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…

    ... />
    I'm doing a bit tweaking of the code; the ... uses byte-rotates, bit-mask and OUT, instead of bit-tests and conditional ...
    PrinceGaz PrinceGaz November 2011 Games
  • BIT/RES/SET b,r where b is variableWhat's the best way to use the bit flag group of commands if it's not known in advance which bit should be referenced; ie. where it's dependent upon …

    Maybe you should be thinking of carrying a bit mask around rather than bit position.
    Alcoholics Anonymous Alcoholics Anonymous March 2012 Development
  • Routine for clearing screenI was looking for a 'nice' way of clearing a screen of graphics in Z80. After a ridiculous amount of time mucking around, this is the best and most …

    ... ; Fill equivilent of "0" (bit 0 of 4000h)
    LD ... a mask of 8 bytes, each holding a bit ... IX to get the "bit mask")
    XOR A
    bit register to "shift"
    ; ... />
    IX_TABLE:
    ; Bit positions within screen byte to ...
    BloodBaz BloodBaz March 2012 Development
  • Any ideas on speeding up this assembler segment?It copies a pixel column of a rectangle which may be anywhere in the display file to a pixel column in d$. The source column may start at any bit pos…

    ... register which will hold the bit mask you are testing the input ... register which will contain the bit mask which you use for the ...
    Patrik Rak Patrik Rak September 2012 Development
<1234567…34>

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