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<1…891011121314…34>
  • Assembly - Loops bigger than 255Hi, It looks like it's a bit difficult to make loops with more than 255 cycles on Z80 machine code, since the 16-bit decrements (DEC) do not alter a…

    ... memory with this number
    INC HL
    DJNZ loop
    Zerg Zerg October 2013 Development
  • z88dk and im2I set up a minimal IM2 mode so I can draw sprites for a laff [code] #include <string.h> #include <stdio.h> #include <im2.h> #include <stdlib.h> #in…

    ... /> LD (BC),A
    INC BC
    INC A
    CP 0 ... /> LD (BC),A
    INC BC
    INC A
    CP 0 ...
    slenkar slenkar October 2013 Development
  • Troublesome routine, help needed!Having problems with this routine, it basically fires a rocket up the screen, but refuses to detect collisions. I'm using attribute blocks for detect…

    ...
    ld a,(rx1)
    inc a
    ld (rx2),a ...
    inc a
    ld (rx3),a ...
    inc a
    ld (rx4),a ...
    inc a
    ld (rx5),a ...
    daveysludge daveysludge November 2013 Development
  • Simple memory transfer routineI'm looking for a simple memory transfer routine that shifts 32 bytes of data from the address HL is set to 55143, I have tried using LDIR, but cant …

    ... ;8 x 4
    loopa inc hl ;increase pointer
    djnz ...
    daveysludge daveysludge November 2013 Development
  • Converting an integer arbitrary large binary number into a printable decimal formThis was asked a long ago at the comp.sys.sinclair newsgroup. At that time, I came up with a solution by extrapolating the classic algorithm of suces…

    ... /> ld (hl),a
    NoAddLow inc hl
    ld a,h ... 0fh
    call PrNotLeading0
    inc hl
    ld a,h ...
    mcleod_ideafix mcleod_ideafix November 2013 Development
  • Math Quiz - MultiplicationThe topic is fast multiplication routines, from 8x8 to 32x32 and all points in between. These functions sit underneath floating point libraries, gen…

    ... reduce the multiplication

    inc h
    dec h

    l0_mulu_24_16x8:

    inc l
    dec l

    inc d
    dec d

    inc e
    dec e
    Alcoholics Anonymous Alcoholics Anonymous January 2014 Development
  • Colission detection problems.G'ah...it's always the same (I've asked before too) - I'm always struggling when it comes to doing box colission checks, so I'm basically hoping you …

    ... x coordinate.
    inc a
    ld ... ; Enemy Xcoord
    inc a
    sub b ... ; Enemy Ycoord
    inc a
    sub b ...
    Sokurah Sokurah February 2014 Development
  • Ghosts n' Goblins loaderI'm trying to put Ghosts n' Goblins onto a +3 disk but struggling to understand the mc loader. Basic loader [code] ink 7 : clear 25000 : load "" cod…

    ... 65063

    65095: INC H
    65096: JR NZ ... : RET NZ
    65155: INC IX
    65157: DEC DE ... : POP DE
    65249: INC SP
    65250: POP BC ... NZ
    65400: INC IX
    65402: INC IY
    65404: ... L
    65485: INC A
    65486: INC A
    65487: ...
    Speccy_James Speccy_James February 2014 Development
  • Venturespeak Helplooking at the code from ZX Computing, October, November & December 1986. How do I make the code do more then 3 letters say 5. and could it be made …

    ... (HL),A
    60119 13 INC DE
    60120 CD3EEB CALL ...
    ardentcrest ardentcrest February 2014 Development
  • Scrolling Bi-Colour Engine for 4-Player GamesJust putting this code up for people to have a look at. Far from finished. Should simply compile and run a bit of a demo. Only good for 128K and +…

    ...
    push af
    inc c

    push ... /> ;Bottom of frame
    inc c
    push bc
    inc hl
    inc d
    ENDM
    inc d
    inc l
    ldi< ... ld (de),a
    inc e
    inc l

    ...
    joefish joefish March 2014 Development
  • Few games for sale inc. Gun Fright, DragontorcHi a few Speccy games for sale - all funds go to the 'I seriously need some cash' charity run exclusively by myself... on behalf of 'train tickets …

    Hi a few Speccy games for sale -

    all funds go to the 'I seriously need some cash' charity run exclusively by myself... on behalf of 'train tickets cost a fortune'

    Please PM offers - will sell singularly / combined etc.
    ...
    retromad retromad March 2014 Sales
  • understanding machine codeHi Quick question. Am not really sure if it fits development forum as its not really development per se its more a learners question about developm…

    ... LD A,(HL)
    23 INC HL
    E5 PUSH HL ...
    username username April 2014 Sinclair Miscellaneous
  • DJNZ displacementHi I had a question about DJNZ operation. Just running through this code in MMCOYZXS by Toni Baker page's 87-88 [QUOTE]21A440 LD HL,40A4 11083F …

    ... ),A

    24 INC H 13 INC DE
    10FA DJNZ ...
    fa0a: 24 inc h
    fa0b: 13 inc de
    fa0c ...
    username username April 2014 Sinclair Miscellaneous
  • byte to screen eventI have another question regarding assembly routine in MMCOYZXS by Toni Baker page's 87-88 [QUOTE]21A440 LD HL,40A4 11083F LD DE,3F08 0608 LD B,08…

    ...

    24 INC H
    13 INC DE
    10FA DJNZ ...
    fa0a: 24 inc h
    fa0b: 13 inc de
    fa0c ... to happen at:
    24 INC H

    I thought ...
    username username April 2014 Sinclair Miscellaneous
  • Double-Buffer ScreenFor my Alien Breed Speccy re-write I decided to use a Double Buffer (DB) or 'Back Screen' to draw all the game action onto, before shuffling the whol…

    ... /> jr nz,aloop
    inc d ;Inc d to add 256 to ...
    LuMan LuMan April 2014 Development
  • Unusual custom turbo loaders - with sourcesI have always been fascinated by turbo loaders; my games all feature a TZX version with one of such schemes implemented, and I have been experimentin…

    ... JR NC,65372
    INC H
    JR NZ,65392 ... br /> AND A
    INC B
    RET Z< ... 255
    SCF
    INC D
    EX AF, AF ... JR NC, 65372
    INC H
    JR NZ, 65392 ... LD C, A
    INC DE
    JR 65453
    AND A
    INC B
    RET Z
    Alessandro Grussu Alessandro Grussu May 2014 Development
  • Optimal shifting for set pixel?Hi, I'm optimizing my set pixel code. For speed. But without using partitioned memory (i.e. a table on 256 byte boundary) I have optimal memory addr…

    ... 8 (0->7)
    inc a ; avoid special condition without ...
    tstih tstih May 2014 Development
  • Problem with DivIDEHi There is a problem on ZX-Spectrum +2 (Grey Model) + DivIDE 2k14 here is video with problem [URL="http://www.youtube.com/watch?v=nIQboFo7Epc"]h…

    ...
    ld (hl),e
    inc hl
    djnz i_03
    Jerri Jerri May 2014 Hardware
  • Fuse bug? Strange T state countingI was testing delay routine presented [URL="http://www.worldofspectrum.org/forums/showthread.php?p=214851"]here[/URL]. I'm reproducing its listing: …

    ...
    or 0
    .g0 inc hl
    .g1 rra
    TK90XFan TK90XFan May 2014 Emulators
  • Currah ?Speech channelIt seems to me that it would be nice to be able to send words to the ?Speech with PRINT #5;"Speak English to me, Jimmy" or some such. There really i…

    ... ), $51 ; make it point
    inc hl ; to the top of ...
    chev chev June 2014 Development
  • Hooky - hook ZX ROM and rewire RST and NMI to RAM - rantThis is a rather long rant. Not for short tempered. :) The objective is to hook into RST "vectors" and NMI on a Spectrum without affecting the normal…

    ... ,DE ; restore HL
    0x11E6 INC HL ; HL=HL+1 (H ...
    0x11FC EXX
    0x11FD INC B ; B /prev. 0/ = B ... EX DE, HL
    0x120D INC HL ; hl back to 0xff58 ...
    tstih tstih July 2014 Development
  • Help with Manic Miner tweaksPlease. :) This is the Software Projects version, simply as I had it to hand. [B]Problem 1:[/B] I've learned a bit (actually quite a bit) and manag…

    ... ) ; 37122 58 87 132
    INC A ; 37125 60
    LD ... , L_90F5 ; 37132 40 231
    INC (HL) ; 37134 52
    RET ...
    spider spider July 2014 Games
  • Problem Reading the KeyboardHi Folks, I'm working my way through Toni Baker's rather good book and thought I'd write some code to scan the keyboard and store the results so tha…

    ... the segment
    INC HL ;Where to ... the segment
    INC HL ;Where to ... the segment
    INC HL ;Where to ...
    _storeKeyFinished
    INC HL ;Somewhere to put the ...
    KrazyKattapilla KrazyKattapilla July 2014 Development
  • Sinclair ZX81 16k Ram ExpansionHi , If anyone has a working one of these in the UK for sale, please PM me with the cost inc shipping. Thanks

    Hi ,
    If anyone has a working one of these in the UK for sale, please PM me with the cost inc shipping.

    Thanks
    lesoleil70 lesoleil70 August 2014 Wanted
  • Machine Code in 30 minutes - car gameWotcha folks, 30 years on and I'm still struggling with Machine Code. I'm going through the 30-minute tutorial on the Chuntey blog and it's all made…

    ...
    jr nz, moveright
    inc l
    moveright
    ld ... the 'left' keys, do we INC L on the outcome of ... infuriates me as I understand INC L to shift the car ...
    Tobo Tobo August 2014 Development
  • Switched voltage regulatorIn the past a replacement voor the (hot!) 7805 has popped up a couple of times in various threads. As far as I know, Recom Power Inc. was always ment…

    ... as I know, Recom Power Inc. was always mentioned, a perfect ...
    georgedb georgedb September 2014 Hardware
  • Better arrangement for video memory?While doing some documentation work for the ZX-Uno project, I compared the advantages of the weird layout of the ZX Spectrum against a linear layout.…

    ... you can use a single INC instruction to go from one ... /> ld (de),a
    inc l
    inc d ;move to next ... /> ld (de),a
    inc l
    inc e ;Increment lo byte ...
    mcleod_ideafix mcleod_ideafix September 2014 Development
  • Z80 Microprocessor BooksCouple of books I came across that to be honest - although I do have a reasonably good collection of books - would be of absolutely no use to me. I'…

    ... here wants em, ?8.50 inc. P&P in the ...
    SimonLCFC SimonLCFC September 2014 Sales
  • Simple text scrolling routine...I'm having trouble writing a very simple text scroller, the idea is to use the ROM printer routine to print 32 characters each time the routine is ca…

    ... />
    ld a,(counter)
    inc a ;increase
    ld (counter ... ,r
    and 5
    inc a
    ld (hl),a ...
    inc hl
    djnz loop
    daveysludge daveysludge September 2014 Development
  • Clonezilla backing up to nfs server over wirelessAnyone have any success running Clonezilla and getting wlan0 mounted? Clonezilla forum I cant post to for some strange reason... Ive made a Clonezi…

    ... .0 Network controller: Atheros Communications Inc. AR928X Wireless Network Adapter (PCI ...
    Hercules Hercules October 2014 Chit chat
<1…891011121314…34>

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