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<1…11121314151617…34>
  • Project: M.u.l.e.Wokani came up with a great idea about trying an open-development approach for spectrum games, and I thought why not try with a game I have under dev…

    memop() works like LDIR in that it copies bytes ( ...
    Alcoholics Anonymous Alcoholics Anonymous June 2007 Development
  • New protection systemsAs a follow-up to [URL="http://www.worldofspectrum.org/forums/showthread.php?t=14311&page=2"]this[/URL] thread regarding relatively new protection sy…

    ... can't just remove the LDIR as it would affect the ... /> However I will mention that LDIR (or LDDR) coupled with the ... val or R entering the LDIr then val (2*BC value ...
    Kilby Kilby July 2007 Development
  • Project: M.u.l.e.Wokani came up with a great idea about trying an open-development approach for spectrum games, and I thought why not try with a game I have under dev…

    ... in asm that uses the LDIR instruction for the byte copy ...
    Alcoholics Anonymous Alcoholics Anonymous July 2007 Development
  • How do I clear only a specific area of a screen (quickly) in machine code ?I'm looking for a machine code routine which will clear the first 20 rows of the Spectrum's display (or any number of rows or columns) . I have found…

    ... ,L
    INC E
    LDIR
    RET

    then ...
    Geoff Geoff July 2007 Development
  • How do I clear only a specific area of a screen (quickly) in machine code ?I'm looking for a machine code routine which will clear the first 20 rows of the Spectrum's display (or any number of rows or columns) . I have found…

    ...
    LD (HL),0
    LDIR

    ; Move on to ...
    hldswrth hldswrth July 2007 Development
  • How do I clear only a specific area of a screen (quickly) in machine code ?I'm looking for a machine code routine which will clear the first 20 rows of the Spectrum's display (or any number of rows or columns) . I have found…

    ...
    LD (HL),0
    LDIR

    ; Move on to ...
    hldswrth hldswrth July 2007 Development
  • How do I clear only a specific area of a screen (quickly) in machine code ?I'm looking for a machine code routine which will clear the first 20 rows of the Spectrum's display (or any number of rows or columns) . I have found…

    ... />
    probably overkill when a LDIR is described as 'extremely quick' ...
    Fikee Fikee July 2007 Development
  • How do I clear only a specific area of a screen (quickly) in machine code ?I'm looking for a machine code routine which will clear the first 20 rows of the Spectrum's display (or any number of rows or columns) . I have found…

    ... ;200783]probably overkill when a LDIR is described as 'extremely quick ... stack is way faster than LDIR, which I wouldn't use ...
    bobs bobs July 2007 Development
  • Compressors are available for Speccys ?Hi folks, although I was an wasn't strictly a speccy coder in the glory days (amstrad & amiga for the most part), I have secides to arse about with …

    ... preferred option as I can ldir it to whatever position I ...
    Kilby Kilby July 2007 Development
  • Compressors are available for Speccys ?Hi folks, although I was an wasn't strictly a speccy coder in the glory days (amstrad & amiga for the most part), I have secides to arse about with …

    ...
    LD B,0
    LDIR
    JR MLOOP
    DISPL ...
    LD B,0
    LDIR
    POP HL
    JR ...
    piters piters July 2007 Development
  • 68000 programming.Anyone here know anything about this? My question is: how does the programmer know how long hisinstructions are? Do determine the operands to branch …

    ... .
    jmp INTER
    INTER nop deal with interrupts. fill this ...
    wilsonsamm wilsonsamm July 2007 Chit chat
  • AftermathAm I doing something wrong, or is there a problem with both the TAP and TZX of [url=http://www.worldofspectrum.org/infoseekid.cgi?id=0005934]Aftermat…

    ... replaces the push with a nop. As long as de is ...
    Mr. Anonymous Mr. Anonymous July 2007 Games
  • Harlequin ZX Spectrum Clone now 100% compatible!Hi all! The Harlequin ZX Spectrum clone now shows full timing compatibility with the ZX Spectrum! 8-) Both the ULA IO and memory contentions are fa…

    The LDIR test from [url=http://fuse-emulator.svn.sourceforge.net/viewvc/fuse-emulator/trunk/fusetest/]Fuse's test suite[/url]?
    Philip Kendall Philip Kendall July 2007 Hardware
  • sound effect code causing crash[FONT=Courier New]I have just written this piece of code to produce a lazer sound effect but for some reason it is causing a crash and I can't figure…

    ... /> out (254),a
    Beep0: nop
    djnz Beep0
    jr ... /> ld b,e
    Beep2: nop
    djnz Beep2
    jr ...
    frobush frobush July 2007 Development
  • Harlequin ZX Spectrum Clone now 100% compatible!Hi all! The Harlequin ZX Spectrum clone now shows full timing compatibility with the ZX Spectrum! 8-) Both the ULA IO and memory contentions are fa…

    [QUOTE=Philip Kendall;205632]The LDIR test from [url=http://fuse-emulator.svn.sourceforge.net/viewvc/fuse-emulator/trunk/fusetest/]Fuse's test suite[/url]?[/QUOTE]

    Thanks Phil. I've pulled that and will give it a go tonight.
    csmith csmith July 2007 Hardware
  • Search for an .mp3 Daren style...[url]http://www.worldofspectrum.org/forums/showthread.php?t=16430&highlight=google[/url] This thread made by Daren has a way of searching for an art…

    ... ]:-( :-) :) :( [/noparse][/QUOTE]

    the nop ARSE tag?? :P
    mel the bell mel the bell August 2007 Chit chat
  • Emulation vs SpecApologies if this is an old thread, what does anyone think is the best - playing spectrum games through emulation or on a real speccy? I feel it's b…

    ... . Hacked games using lots of LDIR instructions could occasionally surpass 100 ...
    Digital Prawn Digital Prawn August 2007 Games
  • Problem with CBSpeccyFirst my config: Amiga 1200, OS 3.1, 68030/50Mhz (with MMU), 16MB Fast. I tried to run 2 versions of "CBSpeccy" (0.24b and 0.25b). Emulator works bu…

    ... was able to emulate the ldir instructions used by Matthew Smith ...
    monty.mole monty.mole August 2007 Emulators
  • A few questions about machine codeOh no... another noob. I'm giving my first steps in assembler (finally, after 20 years stuck in BASIC). I read a SU article explaining that if I wan…

    ...
    ld bc,40832
    ldir[/CODE]

    I know ... 's a rule of the LDIR instruction. It means to move ... all again if BC 0. LDIR - LoaD - Increment - Repeat. Imagine the ...
    DEATH DEATH August 2007 Sinclair Miscellaneous
  • A few questions about machine codeOh no... another noob. I'm giving my first steps in assembler (finally, after 20 years stuck in BASIC). I read a SU article explaining that if I wan…

    ...
    ld bc,40832
    ldir[/code]I know that 'hl ... yes. Certain commands (e.g. LDIR LDDR) insist on certain registers ...
    rich_chandler rich_chandler August 2007 Sinclair Miscellaneous
  • A few questions about machine codeOh no... another noob. I'm giving my first steps in assembler (finally, after 20 years stuck in BASIC). I read a SU article explaining that if I wan…

    ... of stuff" instructions (i.e. ldir, cpir, otir et al.) it ... the same way as the ldir instruction. For example, my flash ... the block instructions use BC. LDIR and LDDR do, but OTIR ...
    Winston Winston August 2007 Sinclair Miscellaneous
  • A few questions about machine codeOh no... another noob. I'm giving my first steps in assembler (finally, after 20 years stuck in BASIC). I read a SU article explaining that if I wan…

    [QUOTE=Winston;210048]Not all the block instructions use BC. LDIR and LDDR do, but OTIR, INIR, OTDR, CPIR and friends just use B.[/QUOTE]

    CPIR is like LDIR in that it uses the BC pair and not just the B register.
    jonathan jonathan August 2007 Sinclair Miscellaneous
  • DarkStar.tzx in Spectaculator 6.25Hi all I think I have found a bug in Spectaculator. Darkstar.tzx(OriginalRelease) wiil not not load. DarkStar.tap loads The DarkStar Re-release t…

    ... B,$B0
    FC7F 00 NOP[/code]to avoid messing with ...
    Jon Needle Jon Needle August 2007 Emulators
  • SCR to SCREENS$Hello, is there a way to convert a .scr file back to a screen$ to load it into an emulator? Thanks!

    ...
    LD BC,6912
    LDIR
    RET

    Will ...
    DEATH DEATH August 2007 Sinclair Miscellaneous
  • A few questions about machine codeOh no... another noob. I'm giving my first steps in assembler (finally, after 20 years stuck in BASIC). I read a SU article explaining that if I wan…

    ... the block instructions use BC. LDIR and LDDR do, but OTIR ...
    Marcelo Marcelo August 2007 Sinclair Miscellaneous
  • A few questions about machine codeOh no... another noob. I'm giving my first steps in assembler (finally, after 20 years stuck in BASIC). I read a SU article explaining that if I wan…

    ... as a BYTE COUNT like LDIR and CPIR etc.
    < ... br /> All "repeat instructions" (LDIR, LDDIR, CPIR INIR, OUTR) all ... is specifically defined by the LDIR instruction. The microcode will actually ... two bytes to run the LDIR instruction again and again.
    BloodBaz BloodBaz August 2007 Sinclair Miscellaneous
  • Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…

    ... the BIT test, DDA test, LDIR test and an IN test ...
    csmith csmith September 2007 Emulators
  • Does anyone remember ftp.ijs.si?This is a blast from the past! I was going through some old files the other day and found this file:- [url]http://reptonix.awardspace.co.uk/sinclair…

    ... by real z80s as a NOP but intercepted by emulators to ...
    Alcoholics Anonymous Alcoholics Anonymous September 2007 Sinclair Miscellaneous
  • Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…

    ... fusetest.zip) simply executes a NOP at 0x7fff at a range ...
    Philip Kendall Philip Kendall September 2007 Emulators
  • Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…

    ... fusetest.zip) simply executes a NOP at 0x7fff at a range ...
    csmith csmith September 2007 Emulators
<1…11121314151617…34>

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