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<1…19202122232425…34>
  • 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…

    ...
    ei ; 4 T
    nop ; 4 T

    ; TOTAL ...
    ajmoss ajmoss July 2010 Development
  • Curious "Pud-Pud" screenshotYou may notice of a curious screenshot made for this article appeared at Microhobby magazine (the one at the bottom left) from Jonathan "Joffa" Smith…

    [QUOTE]did ya find all 10 puddings?[/QUOTE]

    Nop. I'll have to do a try in minutes, or maybe before.
    Neil Parsons Neil Parsons July 2010 Games
  • Problem with PRINT #stream on +128kWorking on a +128k, I want to choose whether all report output goes to screen or printer, so I use PRINT #stream where stream = 2 or 3 for screen or …

    ... could do the equivalent of LDIR/LDDR from BASIC, plus I ...
    Battle Bunny Battle Bunny July 2010 Sinclair Basic
  • Common pitfalls and solutionsLet's discuss some of the common problems in Speccy programming, and the methods we use to avoid them. For an example, here is a piece of code that …

    ...
    LD BC,4
    LDIR
    RES 4,(IY+01 ...
    BiNMaN BiNMaN August 2010 Development
  • Common pitfalls and solutionsLet's discuss some of the common problems in Speccy programming, and the methods we use to avoid them. For an example, here is a piece of code that …

    ...
    LD BC,4
    LDIR
    RES 4,(IY+01 ...
    zxbruno zxbruno August 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…

    ... the first byte, and use LDIR to copy that byte and ...
    joefish joefish 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…

    ... to 'ab'use the LDIR instruction. Have a look ... br /> LD BC,1
    LDIR
    [/CODE]
    You ... location (HL), then you use LDIR to copy (HL) to ( ...
    LD BC,6143
    LDIR
    [/CODE]
    6143 = ... (outside 4000-7FFFh area), LDIR copies data at ~170 KB ...
    RetroTechie RetroTechie August 2010 Sinclair Basic
  • 48K Speccy Repair Log.Some people may know my love for writing up my repairs of arcade PCBs on various forums so thought I would do the same for this little fella. Had th…

    ... very simple test, which involves LDIR'ing a block of 6912 ...
    mcleod_ideafix mcleod_ideafix August 2010 Hardware
  • 48K Speccy Repair Log.Some people may know my love for writing up my repairs of arcade PCBs on various forums so thought I would do the same for this little fella. Had th…

    ... very simple test, which involves LDIR'ing a block of 6912 ...
    ingo ingo August 2010 Hardware
  • updated Fatware - keyboard patchHi! I work with Fatware code and already prepare keyboard patch for original version 0.12. Now it's possible to operate disk browser with keys: 1) c…

    ... also screen version of DEVASTACE (LDIR from divide ram page 1 ...
    velesoft velesoft September 2010 Development
  • Another machine code problem, sorry[CODE] OPCODE HEX ADD LD A,00 3E00 F000 PUSH AF F5 F002 LD B,05 0605 F003 LD C,06 0E06 LOOP F005 POP AF F1 ADD A,C 80 DEC B 05 …

    ... the first command was 0 (NOP). You could then call your ...
    joefish joefish September 2010 Sinclair Basic
  • compressing basicI thought I'd ask here instead of the basic forum.. in the sense of giving me 1 command line, and NOT the whole listing joined up etc. and it uncom…

    ... of machine code with an LDIR to copy the chunk, as ...
    Battle Bunny Battle Bunny September 2010 Development
  • designing a computerHi everyone! I am designing a 4 bit computer and i need some advice, is this a good instruction set? [CODE] BINARY OPCODE DESCRIPTION 00000 nop…

    ... /> You might wish to add NOP and HALT instructions, which are ...
    Matt_B Matt_B September 2010 Chit chat
  • designing a computerHi everyone! I am designing a 4 bit computer and i need some advice, is this a good instruction set? [CODE] BINARY OPCODE DESCRIPTION 00000 nop…

    ... in the high nibble - a NOP in the low nibble (0000b ...
    BloodBaz BloodBaz September 2010 Chit chat
  • logical operators and the calculator stackI was wondering if there was a utility which would provide the list of commands needed for the ROM calculator to evaluate a logical expression. For e…

    ... ;And copy my expression...
    ldir ;...into the workspace
    res ...
    mcleod_ideafix mcleod_ideafix September 2010 Development
  • DMA interface for ZX Spectrum[url]http://velesoft.speccy.cz/data-gear.htm[/url] This is internal DATA-GEAR interface for any 8-bit computer with Z80CPU. Use Direct Memory Access…

    ... . DMA work only as fat LDIR and need long time for ...
    velesoft velesoft September 2010 Hardware
  • designing a computerHi everyone! I am designing a 4 bit computer and i need some advice, is this a good instruction set? [CODE] BINARY OPCODE DESCRIPTION 00000 nop…

    ... /> opcode set opcode set
    nop I made no comment
    Jonathan Harston Jonathan Harston September 2010 Chit chat
  • logical operators and the calculator stackI was wondering if there was a utility which would provide the list of commands needed for the ROM calculator to evaluate a logical expression. For e…

    ... of block in workspace
    ldir ;And copy the param block ...
    mcleod_ideafix mcleod_ideafix October 2010 Development
  • Help! Reverse engineering a Spectrum game[deleted]

    ... memory store routines
    [B]LDIR for your 1st game is ... stack if possible
    [B]LDIR for your 1st game is ...
    Ralf Ralf October 2010 Development
  • Loading BASIC programs stored as "bytes:"Hi all, I have a question regarding loading BASIC programs, that I managed to save as machine code (I suppose) when I was a child, as a result of e…

    ... code, more is allowed
    ldir
    ld a,2
    Dr BEEP Dr BEEP October 2010 Development
  • The Programmers Development System (PDS)Hi everybody, I recall this system has been mentioned several times on WoS forums. Last time was, I think, when those sources from Maz Spork (Buggy …

    ... so it doesn't have LDIR, IX, IY etc. support.
    Turkwel Turkwel October 2010 Sinclair Miscellaneous
  • SJS joystickjust curious if others have seen this [url]http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=130442363333[/url] I mean I have a few but with the…

    Nop - not seen an SJS joystick like that before. Why would you need to unplug the lead? Perhaps one of the early models?
    Whatever the reason the joystic is still going to be total pants!
    itsallgood itsallgood October 2010 Hardware
  • Spectrum 128K RS232 to PC serial cableIf you have read some of my recent posts then you will know that I am eager to link my Spectrum +3 to a PC. This will be done by wiring a standard PC…

    ... ,a ; 28

    nop
    nop
    nop
    ld a,0 ...
    ASM ASM October 2010 Hardware
  • Spectrum 128K RS232 to PC serial cableIf you have read some of my recent posts then you will know that I am eager to link my Spectrum +3 to a PC. This will be done by wiring a standard PC…

    ... ,a ; 28

    nop
    nop
    nop
    ld b,255 ...
    ASM ASM October 2010 Hardware
  • Spectrum 128K RS232 to PC serial cableIf you have read some of my recent posts then you will know that I am eager to link my Spectrum +3 to a PC. This will be done by wiring a standard PC…

    ... ,256
    db 0EDh,176 ; ldir

    reg_i db 62 ...
    ASM ASM October 2010 Hardware
  • The Programmers Development System (PDS)Hi everybody, I recall this system has been mentioned several times on WoS forums. Last time was, I think, when those sources from Maz Spork (Buggy …

    ... so it doesn't have LDIR, IX, IY etc. support.
    ASM ASM October 2010 Sinclair Miscellaneous
  • The Programmers Development System (PDS)Hi everybody, I recall this system has been mentioned several times on WoS forums. Last time was, I think, when those sources from Maz Spork (Buggy …

    ... manual or wikipedia.org? The 'NOP' and other simple instructions take ... .b #64,$A10003
    nop
    nop
    move.b $A10003,d0 ... .b #00,$A10003
    nop
    nop
    move.b $A10003,d1 ...
    ASM ASM October 2010 Sinclair Miscellaneous
  • Spectrum 128K RS232 to PC serial cableIf you have read some of my recent posts then you will know that I am eager to link my Spectrum +3 to a PC. This will be done by wiring a standard PC…

    ... a,d ; 31
    nop
    nop
    nop
    nop ; 16
    dec ...
    ASM ASM October 2010 Hardware
  • Sinclairean A3[B]Sinclairean[/B], a new ZX Spectrum emulator written in machine code for x86-compatible, OpenGL-capable computers. Features: [LIST] [*]Fast machin…

    ... e-mail to madonnamkii [B]LDIR[/B] gmail [B]HALT[/B ... ] com (substitute LDIR by @ and HALT by a ...
    Madonna Mk 2 Madonna Mk 2 October 2010 Emulators
  • Assembly Programming for IDIOTSOk are there any websites guides for what opcodes do in a z80 or books... but for really really thick people like me :-) Something along the lines …

    ... .. things mess up.

    NOP is a c64 code also ...
    fog fog October 2010 Sinclair Miscellaneous
<1…19202122232425…34>

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