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<1…17181920212223…34>
  • Fake screenshots? No - now it's REAL screenshotsOk then. A few weeks ago I said I will show You the new gfx-mode of Speccy and - here it is: [url="http://republika.pl/hooy_prg/hprg.zip"]http://rep…

    ... a english version with english instruction. But I can help you ... though :) at least you undertand Z80 and how spectrum functions as ... /> I understand a lot of Z80, but I?m not a ...
    LCD LCD March 2003 Sinclair Miscellaneous
  • How do I avoid BASIC becoming corrupted on returning from a M/C routine?I'm having trouble with my BASIC program becoming corrupted on returning from a m/c routine which sets all the registers (including the shadow regist…

    ... have to disable the normal interrupt routine if you alter IY ... a minute chance that the interrupt could kick in after the ... and before the next system instruction LD IY,$5C3A.
    About ...
    Geoff Geoff May 2003 Sinclair Basic
  • Who want to remake Double Dragon?Seeing as the Speccy version was crap (see my review: [url="http://www.gamestyle.net/retro.php?article=31"]http://www.gamestyle.net/retro.php?article…

    ... /> [url="http://www.worldofspectrum.org/Z80.html"]http://www.worldofspectrum.org ... /Z80.html[/url]
    [/quote]
    < ... complete catalogue of spectrum assembly instruction with examples?
    moroz1999 moroz1999 June 2003 Games
  • Fire Ruby - More HelpI cant pass the spikes in the fire ruby by lawrence creighton, can someone please help? [ This Message was edited by: welsh_brawler on 2003-08-08 21…

    ... />
    Quill Database : treasusm.z80

    Extracted by UNPAWS32 ... not compressed
    Snapshot type Z80 48K Basic48

    ... name and a one-word instruction.{6}{6}{6}{16}{6 ...
    BadBeard BadBeard August 2003 Games
  • Anyone for a hacking challenge ?I have to get the DSK version of Tomahawk to work. It uses the well-known Digital Integration "SECURITY CODE" lock just like in Bobsled, ATF, etc. Th…

    ... that again)


    Z80 Hacker's Guide circa 1988 ... at memory location 40000. In z80, this would look thus...
    instruction by poking a zero (NOP ...
    BadBeard BadBeard August 2003 Sinclair Miscellaneous
  • 128 Memory PagingI'm having a problem getting my brain around paging. Well, actually the bit I don't understand is how reading I/O ports works! I hope the collective …

    ... shows the IN A,(C) instruction, but the c is in ... .e. can the very next instruction make reference to the new ... that happens is that the Z80 address bus is redirected to ...
    cyborg cyborg August 2003 Sinclair Basic
  • Unknown Games For ZX-Spectrum For Spectrum in period from 1980 to 1993 was made more 15000! games ...Where other 9000?(Don't check info) Also i find Names of very good games fo…

    ... if I have a TAP/Z80/TZX file of them, I ... terms of supplying inlay and instruction scans, whereas in my db ...
    Derek Glen Derek Glen September 2003 Games
  • Basic Compilers and My Compressor CodeAs I mentioned in another thread I'm currently writing a set of compression routines for saving +3 disk space. I've done the first stage (write the …

    ... by letting you step through Z80 instructions as well as the ... "step into" command on an instruction and letting you see the ...
    BuzzinRich BuzzinRich September 2003 Sinclair Basic
  • Basic Compilers and My Compressor CodeAs I mentioned in another thread I'm currently writing a set of compression routines for saving +3 disk space. I've done the first stage (write the …

    Where do you draw the line for a BASIC development program (referring to the z80 instruction stepping) ?


    [ This Message was edited by: Woody on 2003-09-05 21:25 ]
    Woody Woody September 2003 Sinclair Basic
  • Sync-buzzer, interrupts and general confusionBeen wittering on about this in the Misc group, but thought it was best discussed here. Basically been trying to recreate the Sid-Sound effect from A…

    ... ei instruction should be removed. Interrupts are disabled while a maskable interrupt ...
    Metalbrain Metalbrain September 2003 Development
  • HighSPEC (brand new RADICAL High resolution emulator) Hi there, This is an announcement to all spectrum lovers of a brand new (and radical) spectrum emulator called HighSPEC! It is the work of Tom Walk…

    ... time each instruction takes). This was because the original Z80 core was ... in the emulation of the z80. The problem is I don ...
    happymonster happymonster November 2003 Emulators
  • Vic-20s ARE CRAP! (And a few other ramblings from 1984)There was a great rivalry between myself and some of my computer owning chums in the early/mid eighties. The thread title was a phrase I made good us…

    ... as well as line numbers, interrupt driven sprites and keyboard handling ... , and a 256x192 display, and Z80 CPU - it seems to have ...
    chaosmongers chaosmongers November 2003 Games
  • Yet another TR-DOS questionI have yet another TR-DOS problem. I am using "LD C, command; CALL #3D13" to call the system functions. The problem is that TR-DOS automatically enab…

    ... is paged in during an instruction fetch when PC is in ... /> If you use IM2, the interrupt will result in the ROM ...
    Jon Needle Jon Needle November 2003 Development
  • Z80 coders compoIf you're interested in Z80 coders compo, visit my page [url="http://mbr.nm.ru/compo.html"]http://mbr.nm.ru/compo.html[/url]

    ... undocumented behaviour of the DAA instruction -- ie what happens if ... an annoying "add a,0" instruction or similar. Then an ~35 ... Z80 has an effective single bit to indicate whether the last instruction ... even matter if the last instruction was ADD/SUB -- the ...
    Alcoholics Anonymous Alcoholics Anonymous November 2003 Development
  • Z80 coders compoIf you're interested in Z80 coders compo, visit my page [url="http://mbr.nm.ru/compo.html"]http://mbr.nm.ru/compo.html[/url]

    ... Z80 has an effective single bit to indicate whether the last instruction ... Thomas Scherrer's [url="http://z80.info/z80_faq.htm#Q-11 ...
    Philip Kendall Philip Kendall November 2003 Development
  • Z80 coders compoIf you're interested in Z80 coders compo, visit my page [url="http://mbr.nm.ru/compo.html"]http://mbr.nm.ru/compo.html[/url]

    ... to eliminate bugs in our z80 cores - and by not specify ... as if after an ADD instruction, set = act as if after ... a SUB instruction). I hadn't noticed this ...
    Alcoholics Anonymous Alcoholics Anonymous November 2003 Development
  • AssemblageCan any of you marvellous programmers out there recommend a Speccy assembler that even a complete dunce could use? At the risk of sounding thick, as…

    ... one byte. The ld bc, instruction expects two. Hence it requires ... [url="http://www.worldofspectrum.org/Z80.html"]http://www.worldofspectrum.org ... /Z80.html[/url] contains my introductory ...
    cyborg cyborg November 2003 Sinclair Miscellaneous
  • i want to start writing my own gamesi want to start writing my own games but have no idea how. is there any downloadable dummys guides or some software that teaches u how. the only expe…

    ... [/url]

    Some Z80 tutorials published in the '80s ...
    The Z80 User Manual from Zilog. The instruction set description is ... />
    [url="http://www.z80.info/zip/z80cpu_um.pdf"]http ... />
    [url="http://www.z80.info/z80flag.htm"]http://www ...
    Alcoholics Anonymous Alcoholics Anonymous February 2004 Development
  • An MC question (sorry, there's no MC forum to post to!)Ok, still struggling with learning MC - but am getting there. I just can't find anywhere on the web / in books that explains how to do arrays in MC.…

    ... .
    [/quote]

    The z80's index registers are suited ... an array.

    The z80 index registers work in the ... registers IX or IY). Typical instruction:

    ld c,(ix ... index is coded into the instruction and is not variable. For ...
    Alcoholics Anonymous Alcoholics Anonymous April 2004 Sinclair Basic
  • VSYNC FunctionI have written a VSYNC function, so that I can clear the screen before redraw without flicker on the screen, I do this by peeking at the address 2367…

    ... /> [/quote]

    Basic's interrupt service routine takes more than ... the vsync interrupt occurs and the beginning of the first instruction after ... if you wrote your own interrupt routine.
    Alcoholics Anonymous Alcoholics Anonymous May 2004 Development
  • +D/Disciple games archive?Hi all, Having finally got my disciple to work, I'm starting to have a look at hacking multiload games. Is there any archive on the web with games t…

    ... that used special do-nothing z80 op codes to signal the ... a special opcode -- the "NOPD" instruction $ed $?? inserted where the next ...
    Alcoholics Anonymous Alcoholics Anonymous May 2004 Sinclair Miscellaneous
  • +D/Disciple games archive?Hi all, Having finally got my disciple to work, I'm starting to have a look at hacking multiload games. Is there any archive on the web with games t…

    ... -7. Then the special "nopd" instruction is executed (the two bytes ... is a do-nothing NOP instruction. On an emulator that supports ... game snapshot in "r-type.z80" and the level data in ... above, searching for the NOPD instruction in the code, replacing with ...
    Alcoholics Anonymous Alcoholics Anonymous May 2004 Sinclair Miscellaneous
  • Finishing my Ragnar game...Hi all, Way back then, in my youth, I worked on a game for the Speccy called "Ragnar", which was a 3d isometric style mcoded game written from scrat…

    ... course - Ragnar is 100 pure Z80 and was developed in Assembler ... game loop taking the frame interrupt in consideration. For a Coupe ... /> [quote](and 4) perhaps also interrupt handling in general?)[/quote]
    ekoman ekoman July 2004 Development
  • ZX in FPGA...Hmm..seems nobody is interested in a replacement PCB with FPGA...well..heading towards next FPGA projects then...C64 and others (o; [ This Messag…

    ... />
    There's a faster Z80 IP core but uses a ... and pipelined architecture for 1 instruction/clock cycle...


    klingler klingler July 2004 Sinclair Miscellaneous
  • Z80 processor question...Suppose we fill the entire $0000-$ffff memory range with $ed. What will the processor do ? I suppose it will get locked, but will it still respond to…

    The Z80 will examine the EDh string ... is retrieved in a second instruction fetch and processed according to ... is not treated as an instruction prefix. Interrupts would be handled ... IX,[BC|DE|IX|SP] instruction

    [ This Message was ...
    JHutcheson JHutcheson July 2004 Development
  • Another Z80 processor questionOK, this time this isn't clearly covered in the FAQ, as far as I can see.... Suppose we have the CB instruction "SET b,r" (b=bit, r=register (differ…

    ... a BIT n,(IX+d) instruction, bits 3 and 5 ... bit storage register in the Z80, used in 16-bit ... that in any (IX+d) instruction or conditional JR, the final ... list at [url="http://www.z80.info/z80ins.txt"]http://www ... .z80.info/z80ins.txt[/url] ...
    GOC GOC July 2004 Development
  • InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…

    ... by Zilog available. The interrupt request/acknowledge cycle description ... peripheral time to place an instruction / vector on the ... actually part of the interrupt acknowledge cycle when the ... attached peripherals that an interrupt acknowledge cycle is underway ...
    Alcoholics Anonymous Alcoholics Anonymous July 2004 Development
  • InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…

    ... the end of the next instruction, the NMI will still be ... a clock because of internal z80 circuitry).

    With /NMI ... internal flip flop inside the z80 that sets whenever there is ... even occur asynchronously with the z80 clock. The flip-flop retains ...
    Alcoholics Anonymous Alcoholics Anonymous July 2004 Development
  • InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…

    In the instruction set tables by Zilog from 1977 in the book 'Z80 Assembly language programming for students' by Roger Hutty DI and EI are described as setting IFF1 only.

    [ This Message was edited by: Fraser on 2004-07-31 20:46 ]
    Fraser Fraser July 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 …

    IIRC, you have approximately 70000T (some are used by the Z80 to respond to the interrupt) at your disposal, but 16000T seems way too much for a small sprite... are you sure it wasn't a typo ?
    GOC GOC August 2004 Development
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