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<1…19202122232425…34>
  • Pentagon floating bus timingI wanted to take a little break from working on the ZXDS UI yesterday, so I added support for Pentagon timing instead, so I can finally enjoy the lik…

    ... ]

    OK, so this hardware mod basically returns the attribute ... or the content of the register might be the previous attribute ...
    Patrik Rak Patrik Rak March 2014 Emulators
  • SCF/CCF flags - new discoveryI can't believe that no one is interested in discussing the additional, previously undocumented internal state of the Z80 CPU I have discovered recen…

    ... 758844]Thanks, zub. The Q register was just a broader concept ... the Q register seems very unlikely to exist in hardware, even if ... instruction that updates the flags register, but that's an implementation ... to do with how the hardware works internally. In actual ...
    zub zub March 2014 Emulators
  • Address bus contents (i.e. PC) during execution of HALTI'm wondering if anyone can tell me what's placed on the address bus during execution of HALT, beyond the initial M1 cycle. The Z80 user manual state…

    ... some of this on real hardware. When an interrupt occurs when ... the fact that the Refresh register increments while the HALT is ... *is* incremented. Either way the hardware and software effect is the ...
    Jonathan Harston Jonathan Harston March 2014 Hardware
  • Joystick Interfaces on +2AJust found out that my DK'Tronics joystick interface doesn't want to play with my +2A (black). The Kempston port works OK, but not the Sinclair port…

    ... to cut costs on the hardware. I guess you could leave ... 's not a problem for hardware that will never be connected ... :

    [CODE]
    KEYBOARD register (254 dec)

    This ... read only register is mainly used for inputting ...
    zub zub April 2014 Hardware
  • Spectrum screen layoutSeeing the thread on displacement I was wondering why the spectrum had the stupid screen split into three sections and the addresses for each section…

    ... make it this way in hardware (maybe it was the simplest ... it seems. You have a register pair dedicated to the value ...
    Alcoholics Anonymous Alcoholics Anonymous May 2014 Sinclair Miscellaneous
  • AMX mouse emulationI'm trying to add AMX mouse emulation to Spud but not getting very far. I can get a reaction to button presses but nothing to moving the mouse. …

    ... no need any next extra hardware. A-MOUSE driver need more ... (which registers button hits) does register.
    I've ignored the ...
    rich_chandler rich_chandler May 2014 Emulators
  • AMX mouse emulationI'm trying to add AMX mouse emulation to Spud but not getting very far. I can get a reaction to button presses but nothing to moving the mouse. …

    ... 'micky'
    the AMX mouse hardware generates an interrupt and puts ... way by using the I register as the high byte.
    seems possible that the hardware may occasionally return a button ... that
    the AMX mouse hardware only puts the button bits ...
    Jon Needle Jon Needle May 2014 Emulators
  • AMX mouse emulationI'm trying to add AMX mouse emulation to Spud but not getting very far. I can get a reaction to button presses but nothing to moving the mouse. …

    ... 'micky'
    the AMX mouse hardware generates an interrupt and puts ... way by using the I register as the high byte.
    seems possible that the hardware may occasionally return a button ... that
    the AMX mouse hardware only puts the button bits ...
    rich_chandler rich_chandler May 2014 Emulators
  • Definitive list of games incompatible with +2A/+3 and of compatible versions (if any)I am trying to compile the definitive list of games which are incompatible with the +2A and the +3 and of their compatible versions, if they are pres…

    ... grey +2 model because use register I set to #5B value ... track on CD) in real hardware and have the same symptoms ...
    Neil Parsons Neil Parsons June 2014 Games
  • Definitive list of games incompatible with +2A/+3 and of compatible versions (if any)I am trying to compile the definitive list of games which are incompatible with the +2A and the +3 and of their compatible versions, if they are pres…

    ... track on CD) in real hardware and have the same symptoms ... IM2 and bad value of register I. Now I use IM1 ... mode and correct register I value but AY music ...
    velesoft velesoft June 2014 Games
  • Show some love for the Magnum Light GunI remember the reviews were mixed, but in hindsight I suspect the negativity was a result of the quality of some of those initial six games. I recal…

    ... of the t-state count register when the trigger is pressed ... could be processed by either hardware or software to determine the ...
    balford balford June 2014 Hardware
  • Why are rotozoomers on C=64 so fast ?Hi, I noticed rotozoomers on C64 are really fast. I'm not the best coder on Speccy but I know my pet I never succeed to do rotozoomer (or rotating ch…

    ... 's partly how the screen hardware is. hence why 3d stuff ... auto refresh... so you can scroll the chars internally as well ...
    fog fog June 2014 Development
  • Games that crash because of contended memory.I find these are really annoying. You load up a game like Astro Marine Corps, Fantasy World Dizzy, Dizzy: Prince Of The Yolkfolk and so on (the init…

    ... +2 hardware that causes a crash when the I register points into ...
    zx81 zx81 July 2014 Games
  • Face-Off: ZX Spectrum vs. Commodore 64I found an old oldish, but very informed and interesting article on the ole Spectrum vs. Commodore 64 argument. The article explains the technical d…

    ... marvel, but there are severe hardware limits to what can be ... not necessary for a smooth scroll and when the spectrum attains ...
    Alcoholics Anonymous Alcoholics Anonymous August 2014 Sinclair Miscellaneous
  • Face-Off: ZX Spectrum vs. Commodore 64I found an old oldish, but very informed and interesting article on the ole Spectrum vs. Commodore 64 argument. The article explains the technical d…

    ... horizontal or vertical movement, the hardware scrolling certainly can't deliver ... other; never mind making it scroll in a different direction. I ...
    joefish joefish August 2014 Sinclair Miscellaneous
  • Better arrangement for video memory?While doing some documentation work for the ZX-Uno project, I compared the advantages of the weird layout of the ZX Spectrum against a linear layout.…

    ... screen, and you wanted to scroll it horizontally, you could just ... overflow bits in the A register, then move on to the ...
    joefish joefish September 2014 Development
  • Buffer to screen - how much?[FONT=Calibri][SIZE=3]I am starting to build a new game and am researching different ways to accomplish what I need to do. My question is, is it poss…

    ... does same thing in horizontal scroll level.[/QUOTE]

    Interesting ... behind the scenery.

    Scroll size is a matter of ... scenery blocks into 16-bit register pairs and then using different ...
    joefish joefish September 2014 Development
  • πBacteria, Bare Metal emulador for Raspberry PiSorry, Google traslated text below ---- What is an emulator Bare Metal? It is an emulator that runs directly on the machine, no operating system beh…

    ... small PCB with a shift register. I'll do later, when ... I was just prodding the hardware from a hacked fuse binary ...
    guesser guesser October 2014 Emulators
  • Retronaut 1 - My Rubbish Mobile GameFor those of you with an Android tablet or phone, you might want to play my rubbish new Retro-themed game, wot is free:- [url=https://play.google.co…

    Thanks Sokurah. Yeah, the scroll speed is deliberate -- trying to ... Android is you can basically scroll as fast as you want ... 8 bit and 16 bit hardware... might work quite well... chuck ...
    ccowley ccowley November 2014 Chit chat
  • 64x48 monochrome big pixels display ideaHi. I was playing with this idea of having a simple 64x48 bytes buffer, 1 byte per pixel, then a renderer which would take that buffer and render it…

    ... , another for OR. The extra register operations would probably exceed the ... horizontally. But how can we scroll an odd number of steps ... for odd numbers. To repeatedly scroll single steps sideways, you alternate ...
    Einar Saukas Einar Saukas December 2014 Development
  • Speccy Vs Amstrad CPC Vs C64I hope no one minds me posting this here as well as in the announcements section. I'll delete it if there is a problem. It's childish fun but can I …

    ... .
    Spectrum can display better scroll shown in O.T. for ... , gameplay and sound (within the hardware capabilities), as for example: Dynamite ...
    Pegaz Pegaz December 2014 Games
  • Speccy Vs Amstrad CPC Vs C64I hope no one minds me posting this here as well as in the announcements section. I'll delete it if there is a problem. It's childish fun but can I …

    ... both software and hardware sprites in play, the hardware sprites don' ... around 50fps, because the hardware somewhat dictates it.[/quote]
    Not at all, the hardware no more dictates it than ... get a full screen scroll and eight hardware sprites at 50FPS ...
    TMR TMR January 2015 Games
  • HALT: Why always 4ts?Instruction breakdown of halt is like that: PC 4ts. That means it fetches instruction byte from ram which tooks 4 ts and then does nothing and read…

    ... [I]could[/I] construct external hardware that changes the opcode read ... ]
    Sounds logical. So R register keeps being updated, too. And ...
    RetroTechie RetroTechie February 2015 Development
  • Scrolling in BASICI remember a few BASIC typeins for other machines that claimed to be scrolling the screen. Obviously vertically its not too difficult - once you dis…

    ... in asm.. even c64 with hardware you can poke directly, basic ... .. so it's faster to scroll, but the downside is you ...
    fog fog March 2015 Sinclair Miscellaneous
  • Serial comms - duzzit work?Has anyone ever successfully got two 128K Speccies (of any variant) to communicate with each other over the SERIAL / RS232 / MIDI / AUX ports? I can'…

    ... , it's the AY.
    Register 7, B6 is !input
    Register 16 is the I/O ... register is wired (assuming my schematics have no errors...) to the hardware ...
    guesser guesser March 2015 Development
  • Divide by 16 problem...I think.I *think* I have a problem with division. Now, this is not for the Spectrum but it [i]is [/i]for another Z80 platform. I'm converting [b]Speccies …

    ... it works on the real hardware.

    It's not ... . It has to be a hardware design (for some reason) as ... 't have indirect and indexed register addressing instructions either (like [b ... WILL fail when run on hardware (but WON'T fail in ...
    Sokurah Sokurah July 2015 Development
  • ZERO Emulator - BugsI have been using Zero emulator to experiment a few routines in assembly, since it has a somewhat usable debugger. However I believe I found a few b…

    ... and all other double register INCs/DECs don't ... " is a 16 bit register, like BC for example.
    register, its two seperate 8-bit ... an individual breakpoint for each register or a conditional one ... try it on the real hardware, just to be 100% ...
    RMartins RMartins July 2015 Emulators
  • ZERO Emulator - BugsI have been using Zero emulator to experiment a few routines in assembly, since it has a somewhat usable debugger. However I believe I found a few b…

    ... BC and all other double register INCs/DECs don't affect ... weekend, I checked on real hardware (48k issue 2), and confirmed ...
    RMartins RMartins July 2015 Emulators
  • Game development guidesHello all, I want to get into game development for the ZX Spectrum and would like to know where I can find some helpful guides. I've looked around t…

    ... the asm entry point with register API from the c entry ... the libraries are built. Just scroll down to the z80asm invocations ...
    Alcoholics Anonymous Alcoholics Anonymous August 2015 Development
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