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<1…28293031323334>
  • Commodore 1702 NTSC to PAL modIs it possible to mod a Commodore 1702 monitor to accept PAL colors? I can get it to sync with the 50hz signal in black & white by adjusting V-Hold. …

    ... be cable length, shielding, or timing, but frequently they are not ... out eight year old Dell screen for that purpose, because it ...
    pmsr pmsr July 2013 Hardware
  • Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…

    ... code is used for loading screen$ in the normal ROM so ... also possible the JP is timing related, having a different number ...
    chev chev July 2013 Development
  • Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…

    ... code is used for loading screen$ in the normal ROM so ... also possible the JP is timing related, having a different number ... the short-distance JP was timing-related, but changing it to ...
    stephenw32768 stephenw32768 July 2013 Development
  • Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…

    ... 'm guessing that the timing constants are proportionally different to ... />
    ;; load attributes into screen RAM, forwards, without
    ;; an ... to, say, load the screen attributes into high memory ... for an "instant" loading screen, then resume loading the ...
    stephenw32768 stephenw32768 July 2013 Development
  • Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…

    ... keep the code around for SCREEN$ loading.

    [quote]I ... the short-distance JP was timing-related, but changing it to ...
    chev chev July 2013 Development
  • 20-column multicolour: a half-baked ideaI was writing an email reply to one Mr Jowett about multicolour routines, and in that way that explaining something to someone else makes you think "…

    ... at the top of the screen. ZXODUS does this. I don ... out all the kinks in timing coming from a delayed interrupt ...
    joefish joefish August 2013 Development
  • 20-column multicolour: a half-baked ideaI was writing an email reply to one Mr Jowett about multicolour routines, and in that way that explaining something to someone else makes you think "…

    ... at the top of the screen. ZXODUS does this. I don ... out all the kinks in timing coming from a delayed interrupt ...
    Einar Saukas Einar Saukas August 2013 Development
  • Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…

    ... /sync, holds one of the timing constants.
    ;; During data loading ... the bottom third of the screen is loading.

    In ... test program to load a screen
    ld ix,16384
    screen. If I don't have ...
    stephenw32768 stephenw32768 August 2013 Development
  • ULAs interchangeable across issuesHi all, Now that I'm retired, I'm looking again at 8 bit computing :) I'm attempting to revive a spectrum 48K. I'm going to swap chips in/out from…

    ... ULA. This is due to timing changes introduced on that board ... machine can result in visible screen artifacts (no crash though).
    balford balford August 2013 Hardware
  • What (Speccy) game are you currently playing ?(Quite a few threads on what youre listening to, watching etc) What Speccy game are you currently playing ? After playing a LOT of Invasion of the …

    ... was good at that game, timing shots off the edge of ... end up shouting at the screen and screaming, "Cheat!"

    szeliga szeliga August 2013 Games
  • Clashbasher a new interface to reduce colour clashI've been working on this for a while now. [IMG]http://markamy.uwclub.net/cauldron.JPG[/IMG] Basicly its an add on for a 48k spectrum, which reinte…

    ... both produce the full screen horizon effects correctly however ... side so my video timing is out slightly. lots ... did is due to timing constraints, the propeller is ... tomahawk must update the screen by popping bytes to ... the z80's writes to screen.

    However ...
    Basher Basher August 2013 Hardware
  • Clashbasher a new interface to reduce colour clashI've been working on this for a while now. [IMG]http://markamy.uwclub.net/cauldron.JPG[/IMG] Basicly its an add on for a 48k spectrum, which reinte…

    ... I did is due to timing constraints, the propeller is a ... . and I wonder if the screen write algorithms are where you ...
    Gedlion Gedlion August 2013 Hardware
  • Hardware description - MB-02+ interfaceOn this thread will soon released info about MB-02+ idisk interface ( memory paging mechanism, list of ports, addressing, MB IDE, schematics, etc... …

    ... signal as main Z80CPU. But timing of reading/writing bytes is ... ZX games using internal shadow screen(fast copy of data blocks ...
    velesoft velesoft August 2013 Hardware
  • Didaktik Gama and M manualsI?m looking for manuals for the Czech Spectrum clones Didaktik Gama and M. Thought this would be an easy task, but I couldn?t find any user or servic…

    ... as ZX48kB, only CPU and screen timing is different (need different routines ...
    velesoft velesoft August 2013 Hardware
  • Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…

    ... ]
    Well that proves ROM timing works okay.

    [QUOTE ... the wrong part of the screen - what was loaded as ... the lower third of the screen - afterwards the destination seemed to ... misread as '0x5000' (lower 3rd screen RAM), which means a longer ...
    GoingDigital GoingDigital August 2013 Development
  • Can a guy that traveled on the short bus learn machine code...Hmmm So after some soul searching I figured it was time to finaly nail spectrum machine code. Its so frustrating to sit infront of a basic listing w…

    ... do with a NOP besides timing control, branch execution managment... hmmm ... linux, now can get full screen.

    Just wish I ...
    wibble wibble August 2013 Development
  • Bug in Super Wonder Boy in Monsterland?Hello!:smile: This game seems to have a bug that prevents finalize. The dragon that is in the last level, it is impossible to kill.Remains static.No…

    ... graphical corruption (falling off screen)
    ;=============================================================================
    ... br /> ; pause 48k timing alteration (by Metalbrain)
    ...
    Ralf Ralf August 2013 Games
  • Border art viewerRecently, we were working with diver/4d on border art. The idea was to push the techniques of drawing on the border to the limit and to see, how much…

    ... the screen.[/QUOTE]

    SpecEmu does not provide accurate Timex timing ...
    chev chev September 2013 Development
  • Machine code optimisationI'm geting back into z80 coding and wonder what the best way of showing how efficient the code is. I've got Rodney Zaks book and see there are timin…

    ... book and see there are timing figures associates with each instruction ... get graphics data onto the screen (and don't bother using ...
    chev chev September 2013 Sinclair Miscellaneous
  • Machine code optimisationI'm geting back into z80 coding and wonder what the best way of showing how efficient the code is. I've got Rodney Zaks book and see there are timin…

    ... /> To invert the bits on screen to give a negative image ... attributes rather than the actual screen data but the object of ... /> Reason I was asking about timing is that I probably haven ...
    rune rune September 2013 Sinclair Miscellaneous
  • Machine code optimisationI'm geting back into z80 coding and wonder what the best way of showing how efficient the code is. I've got Rodney Zaks book and see there are timin…

    ... , both branches must have identical timing. Anything you do optimally in ... after each statement with its timing, then note the total after ... can see the results on-screen and the effect of each ...
    joefish joefish September 2013 Sinclair Miscellaneous
  • Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…

    ... pilot, it then adjusts its timing constants to fit standard speed ... /> [*]lims_hybrid.tzx has the loading screen as a standard-speed block ... gets a credit. The loading screen and game have not been ... 't even do the first screen! :-)

    Would anyone ...
    stephenw32768 stephenw32768 September 2013 Development
  • Clashbasher a new interface to reduce colour clashI've been working on this for a while now. [IMG]http://markamy.uwclub.net/cauldron.JPG[/IMG] Basicly its an add on for a 48k spectrum, which reinte…

    ... is possible but might have timing issues with how long the ... I write to the entire screen with clashbasher on and make ... the bottom half of the screen with 0x0f bytes after turning ... />
    The top half of screen remains fully detailed and the ...
    David Jones David Jones September 2013 Hardware
  • Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…

    ... time using conservative 583/1166T timing) by loading all the turboloader ... 24000 (or equivalent)
    [*]Load screen and game data (without corrupting ... users can see the loading screen, but after a turboloader it ...
    GoingDigital GoingDigital September 2013 Development
  • display file addressing; screen slicingWhile working on this Compendium I'm updating or rewriting a lot of stuff. One thing I eventually came to appreciate was the simple & clever way in w…

    ... 2/3 of the screen in height, your table ... read a two-byte screen address out of the ... every pixel line of the screen, consider having the high ... you want to keep the timing precise). Then you don ... your sprites - anything off-screen is simply diverted away from ...
    joefish joefish September 2013 Sinclair Basic
  • I have done a Spectrum Screen Design Template As PDFI use this for my games, to work out attribute and screen addresses. It is A4, to be printed landscape [url="http://www.peargames.co.uk/downloads/s…

    ... you've run out of screen and are into the attributes ... or bottom of the screen. The off-screen data just gets written ... contended RAM to preserve the timing... Hmm...
    joefish joefish September 2013 Development
  • display file addressing; screen slicingWhile working on this Compendium I'm updating or rewriting a lot of stuff. One thing I eventually came to appreciate was the simple & clever way in w…

    ... right time to avoid the screen refresh.

    The ... draw everything on a hidden screen, then copy that as fast ... as possible to the main screen.

    Later Spectrum programmers ... flicker as they reproduced the screen update timing all wrong.
    joefish joefish October 2013 Sinclair Basic
<1…28293031323334>

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