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  • Optimized (in size) Z80 simulatorI am evaluating Z80 simulators to try to create a tool to analyse z80 programs. I'd like to start with a simple register coverage tool and t-state cy…

    Well, coding a Z80-emulator on a Z80 machine made me this ... mainprogram to evaluate any Z80-opcode
    DE=PC< ... to opcode execution

    table at #6000
    defb #61 ...
    memory and expand the table at #6000 with more highbytes.
    Dr BEEP Dr BEEP September 2016 Development
  • Optimized (in size) Z80 simulatorI am evaluating Z80 simulators to try to create a tool to analyse z80 programs. I'd like to start with a simple register coverage tool and t-state cy…

    ... IX to point to a table of variables at the start ... extremely non-orthogonal nature of Z80 will make this of very ... write are all different and Z80 code is generally chock full ...
    AndyC AndyC September 2016 Development
  • Optimized (in size) Z80 simulatorI am evaluating Z80 simulators to try to create a tool to analyse z80 programs. I'd like to start with a simple register coverage tool and t-state cy…

    ... IX to point to a table of variables at the start ... extremely non-orthogonal nature of Z80 will make this of very ... write are all different and Z80 code is generally chock full ...
    tstih tstih September 2016 Development
  • CAPS-SHIFT KeyCodeIs there a standard Keycode for CAPS-SHIFT Key ? Looking at the ROM documentation in the Main key table KEYTABLE_A, there is no Entry for CAPS_SHI…

    ... zx/z80/in_key_translation_table.asm?view=markup"]ascii key translation table[/url ... use the ascii keyboard table above to look up ... code using the ascii translation table:
    [url="http:// ... /libsrc/_DEVELOPMENT/input/zx/z80/asm_in_key_scancode.asm?view=markup ...
    Alcoholics Anonymous Alcoholics Anonymous October 2016 Development
  • I'm writing an Operating SystemOkay this might seem like a bait thread, but I am legitamately interested in figuring out how to write a multi-process system for the ZX Spectrum (no…

    ... a difference to the generated Z80 code.

    [quote="tstih ... binaries to generate the reloc table. Because the same object files ... reasons:
    1. The relocation table space needed (albeit discarded after ...
    u6c87 u6c87 October 2016 Development
  • The state of source level debuggingI was just wondering if we can put on a table everything we collectively know about source level debugging for ZX Spectrum to get an overview of curr…

    ... .[/i]) I need a nice z80 disassembly library that is written ... ="http://www.z80.info/disz80.txt"]this table - http://www.z80.info/disz80 ...
    tstih tstih November 2016 Development
  • The state of source level debuggingI was just wondering if we can put on a table everything we collectively know about source level debugging for ZX Spectrum to get an overview of curr…

    ... it - this C# converts assembler table from disz80.txt file to ... ;

    namespace YX.Buggy.Z80
    {
    public class DisZ80Reader ...
    tstih tstih November 2016 Development
  • The state of source level debuggingI was just wondering if we can put on a table everything we collectively know about source level debugging for ZX Spectrum to get an overview of curr…

    Greetings. First part - the Z80 dissasembler - is finished and [url ... here[/url]. It is a table dissasembler so it is very ... set is written in a table:
    [code]
    instruction_t ... -states into the decoding tables. Table values are:
    { opcode, ...
    tstih tstih November 2016 Development
  • Interrupt routineI have been trying to create an interrupt routine for playing AY music in the background but cant seem to get anything working. I have a music rou…

    ... to do with the vector table or something?

    [code ... /> LD (IX+04h),&C3 ; Z80 opcode for JP
    LD ... /> LD (IX+0Fh),&18 ; Z80 Opcode for JR
    LD ... ; High byte address of vector table 46080
    LD I,A ...
    daveysludge daveysludge November 2016 Development
  • New compression method: Exomizer 2After I finished working on optimizing aPLib's decoder, I was told that pucrunch did compress better, and while looking for info about pucrunch (it t…

    ... binary interface (a fixed jump table at the beginning, for example ... 't really a "standard" for Z80 code, is a tricky thing ...
    AndyC AndyC November 2016 Development
  • how to fix instructions on screenI have a problem with my sequencer. I want the top half of the screen to stay fixed but allow the note values to print without pushing the instructio…

    ... /> The IM instruction sets the Z80 processor to one of three ... Vector Table to exist somewhere convenient, and also requires the Z80 "I ... the start of the Vector Table.
    The_Bert The_Bert November 2016 Sinclair Basic
  • Code optimisation! 16bit number to 5 digit stringJust for interest this one, any thoughts on how to make this as fast as possible? Little optimisations to this routine or a complete reimagining? …

    ... "]has already implemented it for Z80[/url] using look up table.
    tstih tstih December 2016 Development
  • Code optimisation! 16bit number to 5 digit stringJust for interest this one, any thoughts on how to make this as fast as possible? Little optimisations to this routine or a complete reimagining? …

    ... implemented it for Z80[/url] using look up table.[/quote]
    The ... , but for the 8-bit z80 with generalized bit shifts, I ...
    Magne Magne December 2016 Development
  • Emulation with remade HD graphics - possible?Do you think it is technically possible to make new HD graphics for a ZX Spectrum game and use the emulation to drive the graphics as the original ga…

    ... in z80) and when one is triggered, a look-up table is ...
    Dunny Dunny January 2017 Emulators
  • endless runner project..So I'm thinking of writing a small tutorial series on writing games for the speccy in C, and figured that an endless runner would be an easy example …

    ... say, the contents of Z80 registers at some point and ... make space in a jump table for that function.
    ... the context of the z80, is a real disadvantage ... pages, smaller than any z80 book and about the same ... to mention that the z80 c compilers mostly implement ...
    Alcoholics Anonymous Alcoholics Anonymous May 2017 Development
  • Database model ZXDBRecently, I have been trying to figure out how to provide my contribution to whoever takes over WoS archive rework next... So I came up with this: …

    ... /> In my database in game_file table the column md5 is UNIQUE ... into several .TAP or even .Z80 files, while the original file ...
    LadyEklipse LadyEklipse July 2017 Announcements
  • Database model ZXDBRecently, I have been trying to figure out how to provide my contribution to whoever takes over WoS archive rework next... So I came up with this: …

    ... /> In my database in game_file table the column md5 is UNIQUE ... into several .TAP or even .Z80 files, while the original file ...
    Einar Saukas Einar Saukas July 2017 Announcements
  • The point of IX+1 IX+2 ?the numbers that you can add-on to IX and IY seem hardcoded, so I dont see the use of that feature? any examples of the use of IX and IY plus number…

    ... a switch uses a hash table to speed things up. This ... is actually quite useful on z80 machines for more sophisticated programs ...
    Alcoholics Anonymous Alcoholics Anonymous July 2017 Assembler
  • Hacking the ZX Spectrum 48K ROMHi Guys, I have modded my Speccy with a dual boot ROM loading on first bank the original ZX kernel and on the second bank an enhanced version. I h…

    ... [url="http://clrhome.org/table/"]a list of Z80 opcodes[/url], as ... familiarize yourself with how the Z80 fetches and executes instructions, especially ...
    Ast_A_Moore Ast_A_Moore November 2017 Hardware
  • Cubic RevealI just though I'd develop this a little further. Written a while ago on a whim! [img]https://dl.dropbox.com/s/p44y5dda49ucmop/square_reveal_1_1.gi…

    ... each byte of the plasma table by 1 Then it checks ... . Once you have your plasma table, its cyclically updated all relative ... if the table calc could be coded into Z80 simply enough then ... could make a new plasma table, then fade out, which of ...
    Arkannoyed Arkannoyed November 2017 Development
  • What is the best book to start AssemblyI want to start to learn Assembly

    ... 940496"]
    As for the Z80 assembly instructions, grab yourself a ... =User%20Manual&f=YUhSMGNEb3ZMM2QzZHk1NmFXeHZaeTVqYjIwdlpHOWpjeTk2T0RBdlZVMHdNRGd3TG5Ca1pnPT0="]Z80 CPU User Manual[/url] from ... this website http://clrhome.org/table/

    KK
    KrazyKattapilla KrazyKattapilla May 2018 Books
  • What is the best book to start AssemblyI want to start to learn Assembly

    ... "]
    As for the Z80 assembly instructions, grab yourself a ... User%20Manual&f=YUhSMGNEb3ZMM2QzZHk1NmFXeHZaeTVqYjIwdlpHOWpjeTk2T0RBdlZVMHdNRGd3TG5Ca1pnPT0="]Z80 CPU User Manual[/url] ... this website http://clrhome.org/table/

    KK
    < ...
    Ast_A_Moore Ast_A_Moore May 2018 Books
  • Making sound using the BEEPER in AssemblyI had a look at the the documentation but it doesn't make sense to me. To make music just the beeper all I have to do is send ones and zeros to one o…

    ... exact T states 'within' individual Z80 opcodes the R/W actions ... /wiki/Contended_I/O provides a table to describe these patterns. For ...
    Hikaru Hikaru July 2018 Assembler
  • Kempston Mouse DriverHi Folks, Does anyone know the email of Chris Cowley who wrote the Kempston Mouse Driver in the WOS Archive? Many thanks Paddy

    ... />
    Could one of you Z80 experts assist please?

    table
    LD HL,y_lookup
    Paddy Coleman Paddy Coleman September 2018 Hardware
  • [Asm] Is this nested loop faster than LDIR or a bunch of unrolled LDI's?Hi all. I'm learning Z80 asm on Speccy 48K, and to start with I decided to write my own "CLS" routine (without relying on ROM calls or LDIR) as a lea…

    ... where you can paste in Z80 asm code and it tells ... version of this reference table http://clrhome.org/table/, which I modified ...
    Ast_A_Moore Ast_A_Moore November 2018 Development
  • Printing text, part MMXIIXI'm pretty sure there's been a zillion threads about this already, and I don't think it's the first one by myself either, but here goes. Proportiona…

    ... is probably the best optimized z80 assembly routine I've managed ... itself, the sources for the table generator are in my speccy ... into needless shifting (thanks to z80's lack of barrel shifter ... that meant was several nested table lookups, which with a limited ...
    Sol_HSA Sol_HSA December 2018 Development
  • im looking for other games like the muncher that use double height and width graphics with colouri havent come across this type of graphics mode on the spectrum before and would like to know if there are any other games that use it.

    ... still be using a lookup table to actually mirror the requisite ... it seems quite cumbersome in Z80 to manually flip all the ... with just a 256 byte table for the flip and that ...
    AndyC AndyC July 2019 Games
  • Need help from people with a +2A/+3Started a topic [url="https://www.worldofspectrum.org/forums/discussion/55141/need-help-from-people-with-a-2a-3"]here[/url] to get a broader reach, b…

    ... display byte (see the above table) or a byte read from ... to, contended memory by the Z80, but with Bit 0 set ...
    Ast_A_Moore Ast_A_Moore November 2019 Development
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