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<1…14151617181920…34>
  • Strange layout of Spectrum video memoryHello, does anyone have an idea why the Spectrum's video memory has such a strange layout? I understand that a resolution of 256x192 is an easy mean…

    ... /> LD HL,(23606)
    LD DE,512
    ADD HL,DE
    EX DE,HL ; DE ... holds a printable char
    LD HL ... ,8
    LOOP LD (HL),A
    INC DE
    INH H ...
    Dr BEEP Dr BEEP August 2004 Sinclair Miscellaneous
  • Pixel setting / general speccy codingi just started doing some cross-coding with the [url="http://www.bigfatpanda.fsnet.co.uk/z80.html"]Z80 SNA assembler[/url] and an emulator, and this …

    ... written as follows:

    LD A,C
    AND 248 ... /> LD DE,PIXELTAB
    ADD A,E
    LD E,A
    LD A,(DE ... )
    XOR (HL)
    LD (HL ... />
    instead of

    LD DE,PIXELTAB
    ADD A,E ...
    dmsmith dmsmith August 2004 Development
  • need help with speed optimization. this procedure draws a sprite with mask from memory onto the screen with x-coordinate in pixels. it doesn't shift sprites in realtime, it just uses …

    ... preshifted bytes...
    LD DE,(SPRADR) ;taking precalculated screen ... the background
    LD (DE),A ;put it back ... (HL)
    LD (DE),A
    DEC DE ;decrease screen address ... LD (DE),A
    DEC DE
    DEC H
    LD A ...
    dmsmith dmsmith August 2004 Development
  • need help with speed optimization. this procedure draws a sprite with mask from memory onto the screen with x-coordinate in pixels. it doesn't shift sprites in realtime, it just uses …

    ... of preshifted bytes...
    LD DE,(SCRADR) ; taking precalculated screen ... '
    OR C
    LD (DE),A

    INC ... br /> OR (HL)
    LD (DE),A
    DEC E < ...
    GENSCRTAB LD DE,16384
    LD HL,SCRTAB
    LD B,3
    dmsmith dmsmith August 2004 Development
  • Interrupts details questionSuppose I am writing a game and I want to use interrupts to measure time, draw the screen without flicker, maybe to poll keyboard etc. What kinds of …

    ... screen
    ld hl, 16384+6144
    ld de, 16384+6144+1 ...
    ld bc, 767

    ld hl, (label2addr(storePtr))
    ld a, (hl)
    ld hl, 16384+4096
    ld (label2addr(storePtr)), hl ...
    Erlstoned Erlstoned August 2004 Development
  • Collision DetectionHi everyone, This is my first post on WOS. Like most people here I owned a Spectrum when a teenager. At that time I was quite heavily into programmin…

    ... />


    CDETECT LD HL,64010 ;address of first ... br /> ;collision

    LD DE,(64001) ;X,Y coords of ... PUSH BC

    LD BC,10 ;number of data ...
    COLLISION POP BC
    LD A,MAXSPRITES ;MAXSPRITES - B gives ...
    dmsmith dmsmith September 2004 Development
  • Smooth Color Masked Sprites using fast page flip on 48kHere is a quick demo of using char based sprites using the Page flip method: a) Background is copied to buffer b) Sprites drawn on buffer c) Buffer …

    ... />
    LD DE,16
    LD HL,(HL1)
    ADD HL,DE
    LD (HL1 ... />
    LD DE,16
    LD HL,(HL1)
    ADD HL,DE
    LD (HL1 ...
    robpearmain robpearmain September 2004 Development
  • Smooth Color Masked Sprites using fast page flip on 48kHere is a quick demo of using char based sprites using the Page flip method: a) Background is copied to buffer b) Sprites drawn on buffer c) Buffer …

    ... /> PUSH AF
    ld de,16
    add hl,de
    EXX
    DE
    PUSH AF
    ld de,16
    add hl,de

    LD ...
    Alcoholics Anonymous Alcoholics Anonymous September 2004 Development
  • Smooth Color Masked Sprites using fast page flip on 48kHere is a quick demo of using char based sprites using the Page flip method: a) Background is copied to buffer b) Sprites drawn on buffer c) Buffer …

    ... /> [code]
    LD DE,16
    HL3 LD HL,0 ; THIS ... DE
    LD (HL1),HL
    EXX
    LD DE,16
    LD ... HL,(HL2)
    ADD HL,DE
    LD ...
    AndyC AndyC September 2004 Development
  • Smooth Color Masked Sprites using fast page flip on 48kHere is a quick demo of using char based sprites using the Page flip method: a) Background is copied to buffer b) Sprites drawn on buffer c) Buffer …

    ... />
    LD DE,16
    ADD HL,DE
    EXX
    LD DE,16

    LD DE,16
    SBC HL,DE
    EXX
    LD DE,16
    robpearmain robpearmain September 2004 Development
  • Smooth Color Masked Sprites using fast page flip on 48kHere is a quick demo of using char based sprites using the Page flip method: a) Background is copied to buffer b) Sprites drawn on buffer c) Buffer …

    ... :
    LD HL,0
    LD DE,16
    ADD HL,DE
    LD (hl3 ... :
    LD HL,0
    LD DE,16
    ADD HL,DE
    LD (hl3a ...
    robpearmain robpearmain September 2004 Development
  • Fast division in machine codeHi Does anyone know what is the fastest way to divide a 16 bit number by 24 in machine code. Derek [ This Message was edited by: dmsmith on 2004-0…

    ...

    LD DE,div3table
    ADD HL,DE
    LD E,(HL)
    LD D,(HL) ; result is now in DE

    gasman gasman September 2004 Development
  • Zecut0r and ZAFA while ago (about 2 yrs)i took VbSpec and tried to port it to Delphi 6. Althought it was pretty weak, it. Meanwhile DelphiSpec 0.1 appeared and i wa…

    ...
    asm ;"asm code"
    ld a,2
    call 5633 ... ;"asm code"
    ld hl,1646
    ld de,261
    call 949 ... ;
    =zxbcol ;
    asm
    ld a,(zxbcol)
    call 8859 ...
    zecut0r zecut0r October 2004 Emulators
  • How can I scroll a line of text and wrap perfectlyI know this is easy for most of you but for some reason I am messing it up. In Assembly Language I want to do the following: I have 1 line of text …

    ... RLC H, RLC L, POP DE, RLC D, RLC E, POP ... again, POP HL, LD DE,0, ADC HL,DE, PUSH HL and you ...
    cyborg cyborg October 2004 Development
  • Savage 3Very popular game Savage (part 3 ) have some firm bug. You score always zero. I find mistake in the code and fixed it. !!!

    ... patch
    54914 LD A,(58114) ;a=bonus LD HL,(58103)
    (58114),A DEC A
    LD HL,(58103) (58114),A
    54932 LD DE,#XXYY DE,#XXYY
    CALL print ...
    g00db0y g00db0y October 2004 Games
  • Help required to calculate screen addressesDoes anyone have some code that calculates the screen address one pixel below the given address ? Is it best to use a lookup table ? Any examples of …

    ... ld de,16384
    ld hl,scradtab
    ld b,192

    lineloop ld ... Changed to inc hl
    ld (hl),d
    inc ... jr nz,nextline
    ld a,e
    add a ... jr c,nextline
    ld a,d
    sub ... 8
    ld d,a

    ...
    Mr Millside Mr Millside November 2004 Development
  • Help needed to speed up functionCan anyone help me to re-factor this code snippet. The "MAP" section holds information about which tiles go where on the screen (handled by another f…

    ...

    LOOP2 LD A,(IX+0)
    LD DE,COLOUR
    ADD ... A,E
    LD E,A
    LD A,(DE ...
    Mr Millside Mr Millside February 2005 Development
  • Help needed to speed up functionCan anyone help me to re-factor this code snippet. The "MAP" section holds information about which tiles go where on the screen (handled by another f…

    ...

    LOOP2 LD A,(IX+0)
    LD DE,COLOUR
    ADD ... A,E
    LD E,A
    LD A,(DE ...
    Dr BEEP Dr BEEP February 2005 Development
  • Help needed to speed up functionCan anyone help me to re-factor this code snippet. The "MAP" section holds information about which tiles go where on the screen (handled by another f…

    ...

    LOOP2 LD A,(IX+0)
    LD DE,COLOUR
    ADD ... A,E
    LD E,A
    LD A,(DE ...
    Dr BEEP Dr BEEP February 2005 Development
  • Help needed to speed up functionCan anyone help me to re-factor this code snippet. The "MAP" section holds information about which tiles go where on the screen (handled by another f…

    ...
    LOOP2 LD A,(IX+0)
    LD DE,COLOUR
    ... ADD A,E
    LD E,A
    LD A,(DE ... all
    LD DE,32
    ADD HL,DE
    < ...
    cyborg cyborg February 2005 Development
  • Help needed to speed up functionCan anyone help me to re-factor this code snippet. The "MAP" section holds information about which tiles go where on the screen (handled by another f…

    ... /> LD DE,COLOUR
    ADD A,E
    LD E,A
    LD A,(DE ... ,1
    [/code]

    DE holds the value 215 * 256 ... this

    LD D,215
    LD E,(IX)

    Dr BEEP Dr BEEP February 2005 Development
  • Help needed to speed up functionCan anyone help me to re-factor this code snippet. The "MAP" section holds information about which tiles go where on the screen (handled by another f…

    ...

    LD HL,22528
    LD IX,MAP
    ... LOOP2 LD E,(IX+0)
    LD A,(DE)
    NOTDIRTILE LD (HL ... LOOP2

    LD DE,32
    ADD HL,DE

    ...
    Dr BEEP Dr BEEP February 2005 Development
  • Help needed to speed up functionCan anyone help me to re-factor this code snippet. The "MAP" section holds information about which tiles go where on the screen (handled by another f…

    ...

    LD HL,22528
    LD IX,MAP
    ... LOOP2 LD E,(IX+0)
    LD A,(DE)
    NOTDIRTILE LD (HL ... LOOP2

    LD DE,32
    ADD HL,DE

    ...
    Dr BEEP Dr BEEP February 2005 Development
  • Help needed to speed up functionCan anyone help me to re-factor this code snippet. The "MAP" section holds information about which tiles go where on the screen (handled by another f…

    ...

    LD HL,22528
    LD IX,MAP
    ... LOOP2 LD E,(IX+0)
    LD A,(DE)
    NOTDIRTILE LD (HL ... LOOP2

    LD DE,32
    ADD HL,DE

    ...
    Mr Millside Mr Millside February 2005 Development
  • Help needed to speed up functionCan anyone help me to re-factor this code snippet. The "MAP" section holds information about which tiles go where on the screen (handled by another f…

    ... /> LOOP2 LD E,(IX+0)
    LD A,(DE)
    NOTDIRTILE LD (HL),A ... LOOP2

    LD DE,32
    ADD HL,DE

    DEC ...
    Dr BEEP Dr BEEP February 2005 Development
  • Help needed to speed up functionCan anyone help me to re-factor this code snippet. The "MAP" section holds information about which tiles go where on the screen (handled by another f…

    ... org 50000

    ld de,22528
    ld hl,map

    ld a,(bc)
    ld (de),a
    inc e
    ld (de),a ...
    inc de
    AndyC AndyC February 2005 Development
  • Anyone help re-factoring a tile functionI had some excellent feedback for re-factoring my function that displays the colour for my screen tiles. Can anyone offer some help to improve the fu…

    ... br /> LD DE,16384
    LD C,9
    LD IX,MAINMAP< ... JP NZ,NXTROW1
    LD DE,18432
    JP ... E
    LD A,(HL)
    LD (DE),A
    ...
    Dr BEEP Dr BEEP February 2005 Development
  • Anyone help re-factoring a tile functionI had some excellent feedback for re-factoring my function that displays the colour for my screen tiles. Can anyone offer some help to improve the fu…

    ... br /> LD DE,16384
    LD C,9
    LD IX,MAINMAP< ... JP NZ,NXTROW1
    LD DE,18432
    JP ... E
    LD A,(HL)
    LD (DE),A
    ...
    Mr Millside Mr Millside February 2005 Development
  • Anyone help re-factoring a tile functionI had some excellent feedback for re-factoring my function that displays the colour for my screen tiles. Can anyone offer some help to improve the fu…

    ...
    LD DE,16384
    LD C,9
    LD IX,MAINMAP< ... JP NZ,NXTROW1
    LD DE,18432
    JP NXTROW3 ... JP NZ,NXTROW2
    LD DE,20480
    JP NXTROW3 ...
    Mr Millside Mr Millside February 2005 Development
<1…14151617181920…34>

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