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<1…16171819202122…34>
  • Break into programIs there any way of stopping people using the break option in my software productions so they can list the code.

    ... /> MCTRAP: di
    dec sp
    dec sp
    ei
    MODE48 ... ;LINE-NEW
    bit 4,(iy+$01)
    jr z,MCCONT ...
    Battle Bunny Battle Bunny October 2013 Sinclair Basic
  • SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…

    ... ) ; final character?
    ex de, hl ; token character address ... statement number
    ld (iy + _subppc), d ; store ... evaluate expression
    bit 6, (iy + _flags) ; numeric result
    bit 6, (iy + _flags) ; string result
    chev chev October 2013 Development
  • SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…

    ... get variable
    set 7, (iy + _flags2) ; switch on
    ... get variable
    set 3, (iy + _flags) ; 8-bit mode
    c_udg_1:
    res 3, (iy + _flags) ; set 7-bit ... /> cpir ; match found?
    ex de, hl ; next character address ...
    chev chev October 2013 Development
  • SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…

    ... ; return if zero
    ex af, af' ;'store count
    bit 0, (iy + _vdu_flag) ; lower screen
    ...
    chev chev November 2013 Development
  • SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…

    ... ; set it
    ld sp, (attr_t) ; restore stack pointer ... clear carry flag
    ex de, hl ; switch destination ...
    chev chev November 2013 Development
  • SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…

    ... ' ' ; insert
    bit 0, (iy + _flags) ; leading space
    call ...
    ld (err_sp), sp ; set err-sp to stack pointer
    chev chev November 2013 Development
  • bit manipulation conundrumWhat's a neat way to change this bit pattern in registers BCDE: [code]Loop0: ;change B:00000000 C:abcdefgh D:ijklmnop E:qrstuvwx[/code] to this bit …

    ... /> ld ix,bufferSource
    ld iy,bufferTarget

    ; store in ... /> xor a
    Loop0:
    ex af,af'
    ld a ... /> ld (SelfMod + 3),a
    ex af,af'
    SelfMod: ; BIT ... next byte
    SameByte:
    ex af,af'
    ld a ...
    David Jones David Jones November 2013 Development
  • Multicolor chess?I thought multicolor chess pieces would be a good idea, since it's easy to fit a 8x8 chessboard within the 9x9 tile area of BIFROST*. However this tu…

    ... for each row, just an EX AF,AF' and an EXX ... of PUSH AF, DEC SP, PUSH DE, DEC SP etc. on each ...
    joefish joefish December 2013 Development
  • Z80AsmI've been using the Z80 PC Assembler 1.2 by Peter Hanratty and found that the RST 8 instruction assembles to 200. It should be 207. Ret Z is 200 wh…

    ...
    ;
    0000 31362C LD SP,2C36H
    0003 2032 JR ... )
    0010 FD8E00 ADC A,(IY+00H)
    0013 CE00 ADC ...
    rune rune December 2013 Development
  • A new full-screen bicolor engine called NIRVANA[I]OK, there's something I need to clarify first: Nowadays if you write [B]"multicolor"[/B] everyone assumes it refers to "multicolor 8x1" (an attri…

    ... dup 4
    ld sp, 22562+ROWREPT*32+5 ; ... and 2(*)
    ld iy, 256*N+N ; ... and 2
    push iy ; columns 5 and ... and 4
    ld sp, 22562+ROWREPT*32+19 ...
    DenisGrachev DenisGrachev January 2014 Brand new software
  • Help with File Compressor by Mladen PopovicHi, I'm trying to compress BombJack (MCM) and transfer it to a +3 disk (Yes I own the original game :) ). I'm unsure about the addresses to enter in…

    ... ,(23730) ;(RAMTOP) = old RAMTOP
    ex de,hl
    and a ... /> ld de,(23613) ;(ERR_SP)
    ex de,hl
    and a ... hl,de
    ld sp,hl ;move SP
    ei
    ret ...
    Speccy_James Speccy_James January 2014 Development
  • Using the stack to blit bufferI was using a ldir to blit my back buffer to the screen RAM, and it was working pretty well if not rather slow. After reading about using the stack …

    ... . It is done by [B]EX AF,AF'[/B].

    EX AF,AF'
    EXX
    IY can't be swapped as ...
    joefish joefish February 2014 Development
  • Using the stack to blit bufferI was using a ldir to blit my back buffer to the screen RAM, and it was working pretty well if not rather slow. After reading about using the stack …

    halt
    di
    ld sp, buffer
    pop af
    ... hl
    pop ix
    ex af,af'
    exx
    pop hl

    ld sp, screen+18
    push hl ...
    m1k3yboi m1k3yboi February 2014 Development
  • Questions about Vortex Tracker II exported songsHi, I have been experimenting with Vortex Tracker II lately and have a couple of questions. By exporting the song to TAP format, a file is generated…

    ... ,bc,af
    exx
    ex,af'
    push af,hl ... ,bc,af
    push ix,iy
    call 27810+5 ;play ... music
    pop iy,ix
    pop af,bc ... ,de,hl
    ex af,af'
    exx
    Jerri Jerri March 2014 Development
  • JP (HL) confusionokay.... JP nn will jump to memory address nn. JP (HL) ,I assumed would read the contents of memory address HL and jump to the location and be a gre…

    ... clearly intended to cater for SP-relative memory accesses efficiently. ... do SP-relative operations using the Z80's IX and IY ... IX or IY before doing 'ADD IX,SP' or 'ADD IY,SP', which seems ... unfortunate, as 'LD IX,SP' or 'LD IY,SP ...
    zub zub March 2014 Development
  • JP (HL) confusionokay.... JP nn will jump to memory address nn. JP (HL) ,I assumed would read the contents of memory address HL and jump to the location and be a gre…

    ... accesses to HL to IX/IY, and then just continues executing ... . It's the same as EX DE,HL doesn't move ... ! The extra ADC/SBC IX/IY,BC/DE instructions that we ...
    zub zub March 2014 Development
  • FUSE serial communication sample anyone?Hi, in [URL="http://manpages.ubuntu.com/manpages/precise/man1/fuse.1.html"]FUSE man pages[/URL] one finds switches for serial comms. By using --inte…

    ... call the routine with IY set to SP, but you're only ... you load something else into IY first?

    Without knowing ...
    zub zub April 2014 Development
  • FUSE serial communication sample anyone?Hi, in [URL="http://manpages.ubuntu.com/manpages/precise/man1/fuse.1.html"]FUSE man pages[/URL] one finds switches for serial comms. By using --inte…

    ... call the routine with IY set to SP, but you're only ... you load something else into IY first?
    [/QUOTE]

    Yeah using IY might be troublesome. Try without ...
    Alcoholics Anonymous Alcoholics Anonymous April 2014 Development
  • Is there an SNA halt bug?Hello all, I noticed that some SNAs don't work on my emulator but they do work in almost everyone else's, SPUD fails with them too which is a tad sp…

    ...
    0D BC
    0F IY
    11 IX
    13 ...
    15 AF
    17 SP
    19 Interrupt mode, 1 ...
    John Elliott John Elliott April 2014 Emulators
  • Fuller AY only gamesThe definitive list: 1) Demonstration Tape 2) Bodysnatchas 3) Star Bike

    ... stack and cls
    ld sp,$8100
    call $0d6b
    inc hl
    ex de,hl
    xor a ...
    ld (hl),a
    ex de,hl
    djnz tloop ...
    Jimmy Jimmy May 2014 Games
  • 30-column 8x2 multicolor (even in 48K)I don't recall any 8x2 multicolor routine for 30 columns that would work on all Spectrum models (including the Spectrum 48K), so I decided to write i…

    ...
    ld ix
    ld iy
    ld bc:ld de ... /> ld hl ;122
    push iy ;137 (put 23,22)
    ld sp ;232
    ld bc:ld ... /> ;-104

    Note that sp holds for the next line ...
    Alone Coder Alone Coder May 2014 Development
  • 30-column 8x2 multicolor (even in 48K)I don't recall any 8x2 multicolor routine for 30 columns that would work on all Spectrum models (including the Spectrum 48K), so I decided to write i…

    ... ]LD IX,nn
    LD IY,nn
    LD BC,nn ... /> LD HL,nn
    PUSH IY ; columns 22 and 23
    LD SP,nn ; reference columns 28 and ...
    Einar Saukas Einar Saukas May 2014 Development
  • 30-column 8x2 multicolor (even in 48K)I don't recall any 8x2 multicolor routine for 30 columns that would work on all Spectrum models (including the Spectrum 48K), so I decided to write i…

    ... /> ; 15820T
    LD IY,nn
    ; 15834T
    LD SP,nn ; reference columns 28 ... ; 16181T
    LD SP,nn ; reference columns 28 ... ; 16184T
    LD SP,nn ; reference columns 28 ...
    Einar Saukas Einar Saukas May 2014 Development
  • 30-column 8x2 multicolor (even in 48K)I don't recall any 8x2 multicolor routine for 30 columns that would work on all Spectrum models (including the Spectrum 48K), so I decided to write i…

    ... 14 and 15
    LD IY,nn ; attributes for columns 22 ... (NEW ATTRIBUTE ROW)
    LD SP,nn ; reference columns 24 and ... 20 and 21
    PUSH IY ; update columns 22 and 23 ... 7 on screen
    LD SP,nn ; reference columns 28 and ...
    Einar Saukas Einar Saukas May 2014 Development
  • 30-column 8x2 multicolor (even in 48K)I don't recall any 8x2 multicolor routine for 30 columns that would work on all Spectrum models (including the Spectrum 48K), so I decided to write i…

    ... ; 15814T
    LD IY,nn ; attributes for columns ... ; 16127T
    LD SP,nn ; reference columns 28 ... ; 16181T
    LD SP,nn ; reference columns 28 ... ; 16184T
    LD SP,nn ; reference columns 28 ...
    Einar Saukas Einar Saukas May 2014 Development
  • FUSE serial communication sample anyone?Hi, in [URL="http://manpages.ubuntu.com/manpages/precise/man1/fuse.1.html"]FUSE man pages[/URL] one finds switches for serial comms. By using --inte…

    ...
    ld iy,#0x0000
    add iy,sp
    ld ... l,2(iy)
    ld h,3(iy)< ... /> ;; intialize SP
    ld (#_rs232_sp),sp ; store SP
    ld sp,#retm_table ; 20 ... states

    ld sp,(#_rs232_sp) ; restore stack
    ...
    tstih tstih June 2014 Development
  • llvm-z80 statusFew months ago I read about efforts to produce llvm back-end for the Z80 (even perhaps as part of new z88dk). Any update on that? I found [URL="htt…

    ... , 0
    add ix, sp
    ld sp, ix
    ld hl ... pointer to ix and using iy for things. There's a ...
    Alcoholics Anonymous Alcoholics Anonymous September 2014 Development
  • Help needed with a bit of code...My minds gone blank again I'm afraid, I'm having trouble with this routine that loads variables into memory then calls the corresponding routine. Th…

    ... you want to preserve, then EX HL,DE to swap the ... , you can use IX and IY in most places where you ... HL for different tasks. And EX DE,HL can come in ...
    joefish joefish October 2014 Development
  • Banked memory running slower?I've just compiled a TAP which includes bank6, it loads ok, but the routines that are paged in run slightly slower. The Z80 snapshot has no such pro…

    ... routine #4000 to #be00
    ;sp must be same
    ; on ...
    mem_128
    ld (retsp),sp

    ;testing speed
    add hl,de
    ex de,hl
    mem1283
    djnz mem1282
    ld sp,$
    retsp equ $-2
    Jerri Jerri November 2014 Development
<1…16171819202122…34>

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