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  • Step through assembly language whilst viewing registers and flagsHello, Is there anything available which would let me step through an assembler listing and see how each register (and flag) changes at each instr…

    Hello,

    Is there anything available which would let me step through an assembler listing and see how each register (and flag) changes at each instruction?

    Thanks
    jonesypeter jonesypeter August 2017 Development
  • A Neat Redefine Keys RoutinePreviously, I’ve only shared this routine with a couple of people via PM, but I’ve now decided to make it public. I optimized it for size, so it uses…

    ... ; otherwise, use a 16-bit register
    ;pair, such as HL ...
    Ast_A_Moore Ast_A_Moore October 2017 Development
  • Restoring AY registersAfter doing (not still finished) the sna to tap converter, I'm going to try to do the same for 128k snapshots. I've got threee ideas about what to do…

    ... 7.
    5.- Restore page register $7ffd.[b](*)[/b]
    6 ... delay between selecting an AY register and writing a value?
    Zup Zup April 2018 Development
  • Writing own emulator: Contention questionsHi! (I don't know if this message should be here or in Hardware) I'm trying to write my own emulator just for the sake of it, and I'm having pr…

    ... to understand why the IR register pair is being used there ...
    MrKii MrKii April 2018 Emulators
  • Parallel to serial z80 i/o portI have an Opus Discovery and an Alphacom 32 printer. I want to see if I can make a cable that will use the Opus Parallel printer port. The question i…

    ... reference bits of the A Register byte?)

    Note: I ... state "...the data is in Register A..." this is the ZX ... Spectrum A register and not another pin?
    hedge hedge April 2018 Hardware
  • Fuse 1.5.6 releasedA new release of Fuse, the Free Unix Spectrum Emulator, is now available at the SourceForge project: https://sourceforge.net/projects/fuse-emulato…

    ... :
    [list]
    [*] Z80 flags register is now correct after SCF ...
    Fred Fred August 2018 Emulators
  • Fuse for macOS 1.5.6 ReleasedA new version of Fuse for macOS has been released at the dedicated sourceforge project: https://sourceforge.net/projects/fuse-for-macosx/ Note …

    ... :
    [list]
    [*] Z80 flags register is now correct after SCF ...
    Fred Fred August 2018 Emulators
  • ZEsarUX-7.1 BETAHi I have uploaded a new ZEsarUX 7.1 BETA version here: https://github.com/chernandezba/zesarux/releases/tag/7.1-10082017 Changelog of this …

    ... /> *readdir call was incrementing PC register when there was no more ...
    chernandezba chernandezba August 2018 Emulators
  • ZEsarUX-7.1Hi! There’s a new stable version of ZEsarUX, version 7.1! The next 24th of September it will be 5 years old :) So this is a special anniversary…

    ... br /> Added setting --random-r-register to generate random value for ... R register on every cold start, ... *Now you can use every register, variable, number on any position ... *readdir call was incrementing PC register when there were no more ...
    chernandezba chernandezba September 2018 Emulators
  • [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…

    ... is operating on all 16bit register pairs, but would it be ...
    ST1 ST1 November 2018 Development
  • Todays rant! There must be something archaic about my wiring! Because Heather bought me a nice smartphone oh about two or three years ago and I simply could not…

    ... my skin doesnt seem to register, so making a move across ...
    mik3d3nch mik3d3nch March 2019 Chit chat
  • Drawing LinesHas anyone got any experience of coding a Bresenham line drawing algorithm on the Speccy? I've had a go and I find the algorithm has quite a few s…

    ... the screen byte in a register and adding adjacent pixels to ...
    joefish joefish March 2019 Development
  • converting sna to tapsince i'm struggling to find a simple sna to tap converter that works fine on gnu/linux, i'm about starting to code one on my own (using a scripting …

    ... , and how to set "F" register (perhaps only using push and ...
    nitrofurano nitrofurano April 2019 Development
  • LEGO SEGA Arcade MachinesLEGO is having a run-off between four previously submitted set ideas. All are approved to be made, whichever wins the vote. Naturally I'd love to se…

    ... cabs), so take a look, register and vote!
    [url]https ...
    joefish joefish May 2019 Chit chat
  • Z80onDSK now compatible with +3e with ZXMMC or similarJust updated my utility to work on Spectrums equipped with +3e ROMs and IDE storage. I've tested this with ZXMMC at the moment but don't think there …

    ...
    ║ -s .scr: use an alternate loading screen. Must be a ... mode, snapshot 1 has an alternate loading screen
    ║ snapshot 2 ...
    TomD TomD May 2019 Sinclair Miscellaneous
  • Currah uSpeech ROM Paging and BootyHi, When I emulated the Currah uSpeech for [url="http://www.inkland.org.uk/inkspector"]InkSpector2[/url], I made it page in its own ROM on memory …

    ... bytes of ROM too, as register DE wraps around.

    inky inky October 2019 Hardware
  • Can someone run this test program on a real Spectrum 48K?I've knocked up a small test program just to satisfy my emulation OCD if someone with a real 48K Spectrum can spare a couple of minutes to run it.? …

    ... interrupt response" or "Incorrect R register value". I'm kind of ...
    Woody Woody November 2019 Emulators
  • ZEsarUX 8.1 Beta 2Hi! I have uploaded a new ZEsarUX 8.1 Beta 2 version! You can download it from https://github.com/chernandezba/zesarux/releases/tag/8.1-161220…

    ... setting to disable looking for alternate character sets from sysvar 23606 ...
    chernandezba chernandezba December 2019 Emulators
  • Will be away for at least a week.Just signing in for one hour, and typing this up in advance, hopefully i will be able to get it posted and do anything else I need, because one hour …

    ... option I picked didn't register and the recorded message just ...
    dmsmith dmsmith March 2020 Chit chat
  • New Utility Z80onMDR - Transfer Z80 snapshot to Microdrive CartridgesWith the growing popularity of the excellent vDrive [url]https://vdrivezx.com/vdrivezx/[/url] I've adapted one of my utilities to create Microdrive …

    ... ; snapshot2, snapshot1 has an
    | alternate loading screen and filename, menu ...
    TomD TomD September 2020 Brand new software
  • ZEsarUX 9.1New ZEsarUX stable version 9.1 :) You will find, as always, compiled versions for Linux, FreeBSD, Mac and Windows. The source code is available,…

    ... emulation of tbblue joystick type (register 5)
    -Added sprite zoom ...
    chernandezba chernandezba November 2020 Emulators
  • Problem registeringI've seen this message in ggogle groups: David Sweeney I am trying to register an account on the World of Spectrum forum, but it keeps blocking…

    ... />
    I am trying to register an account on the World ...
    NotFound NotFound March 2021 WoS/Forum Issues
  • The ZX Dev is back - ZX Dev Media - Demakes!After more than 1 and a half years, the ZX Dev compo is back! This edition the topics are Media (TV, Movies, cartoons, radio, books, comics, etc) and…

    ... action, please feel free to register to participate!

    https ...
    Ivanzx Ivanzx April 2021 Announcements
  • The ZX Dev is back! ZX Dev Media & DemakesAfter more than 1 and a half years, the ZX Dev compo is back! This edition the topics are Media (TV, Movies, cartoons, radio, books, comics, etc) and…

    ... action, please feel free to register to participate!

    We ...
    Ivanzx Ivanzx August 2021 Announcements
  • Remainder (Mod) calculationsI've been figuring out how to calculate remainders after integer division by a constant divisor k (A mod k = A % k). I found that for most small di…

    ... br /> The unsigned integer in register A is copied to C ... k) in some bits of register B.
    The size ... C or using one extra register.

    [b]Mod ... the first shift in a register to use in the ... 23 bytes, 89cc[/b]
    Register B = (A//9)*4
    Magne Magne October 2021 Assembler
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