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<1…21222324252627…34>
  • Between interrupts and handlersSee there's this short period of time immediately after an interrupt comes but [i]before[/i] the control is transferred to an interrupt handler, abou…

    ... can be delayed by several Tstates, so is the interrupt handler ... , making the INT pulse 32 Tstates in width (does any non ... exactly a certain number of Tstates from the moment the ULA ...
    mcleod_ideafix mcleod_ideafix June 2012 Development
  • Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …

    ... saving of 37,888 tstates and that is before ... would save another 92 tstates per char a further ... 47,104 tstates over 512 chars, so ... in total saving 84,992 tstates over 512 chars ;)
    ... PRMTX defb 17 ; saving 10 tstates
    ATTCC defw $5800; ...
    Baggers Baggers June 2012 Development
  • Newbie willing to try doing some gfx...I've tried my wings in creating some hires graphics on C64 and I'd like to try making some also with speccy just out of curiosity, but my knowledge a…

    ... DOES NOT MEAN 625 lines 50hz video.

    [QUOTE=Romppainen ...
    guesser guesser June 2012 Sinclair Miscellaneous
  • Spectrum Emulator that supports low resolutions and runs smoothlyHello to All, I have been trying to find a spectrum emulator that will work well through my CRT TV (using RGB to Scart) Most emulators seem to supp…

    ... released in Europe = 320x240 PAL 50Hz
    = Black borders top and ... released in Europe 320x240 PAL 50Hz
    = Black borders top and ... on CRT

    320x240 50hz does not

    320x240 ... is designed for a PAL 50Hz display

    don't ...
    filevans filevans July 2012 Emulators
  • Spectrum Emulator that supports low resolutions and runs smoothlyHello to All, I have been trying to find a spectrum emulator that will work well through my CRT TV (using RGB to Scart) Most emulators seem to supp…

    ... has borders when run in 50hz, spectrum never ran in 320x240 ...
    filevans filevans July 2012 Emulators
  • Spectrum Emulator that supports low resolutions and runs smoothlyHello to All, I have been trying to find a spectrum emulator that will work well through my CRT TV (using RGB to Scart) Most emulators seem to supp…

    ... has borders when run in 50hz, spectrum never ran in 320x240 ...
    MrCheese MrCheese July 2012 Emulators
  • Spectrum Emulator that supports low resolutions and runs smoothlyHello to All, I have been trying to find a spectrum emulator that will work well through my CRT TV (using RGB to Scart) Most emulators seem to supp…

    ... american NTSC DVD in PAL 50hz on a CRT TV you ...
    filevans filevans July 2012 Emulators
  • Spectrum Emulator that supports low resolutions and runs smoothlyHello to All, I have been trying to find a spectrum emulator that will work well through my CRT TV (using RGB to Scart) Most emulators seem to supp…

    ... card in the Wii does 50Hz PAL composite video out. Not ...
    chev chev July 2012 Emulators
  • Multiply the value of 'a' by 5Is there a way of multiplying the value of 'a' by 5? I've tried 'add a,a' etc. but only get multiples of 2...

    You could use RLA, which only takes 4-tstates, instead of SLA A if you're sure that it won't carry.

    If it does carry, you'd have to do something other than just ADD A,A in any case.
    Matt_B Matt_B July 2012 Development
  • Zymosis -- WTFPL'ed Z80 Emulation Corebreaking news! i'm back with another useless project: new Z80 emulation core written in pure C! i hear you screaming: "oh, no! WHY?!" let me tell yo…

    ... SideWize working without strange '+6 tstates' i added to make it ...
    Ketmar Ketmar July 2012 Emulators
  • Zymosis -- WTFPL'ed Z80 Emulation Corebreaking news! i'm back with another useless project: new Z80 emulation core written in pure C! i hear you screaming: "oh, no! WHY?!" let me tell yo…

    ... SideWize working without strange '+6 tstates' i added to make it ...
    chev chev July 2012 Emulators
  • T-States?Can anyone point me to any good reading (or summarise) that will explain exactly what a tstate is? At the moment for me, tstates are a useful gauge …

    ... -Tape;641343]
    So, why tstates and what are they please ...
    Alcoholics Anonymous Alcoholics Anonymous July 2012 Development
  • 64x48 full colour graphicsHow feasible is this? Could an interrupt-driven routine be used to, for example, fill the top two thirds with a 64x32 blocky picture and leave the bo…

    ... ;11

    takes 21 tstates = 10,5 tstate for one ... =32 bytes would need 336 tstates.

    One line is ... drawn by ULA in 224 tstates. But me may start coping ... it give us about 400 tstates to do the job?
    Ralf Ralf July 2012 Development
  • 64x48 full colour graphicsHow feasible is this? Could an interrupt-driven routine be used to, for example, fill the top two thirds with a 64x32 blocky picture and leave the bo…

    I wonder if we could ignore the stack and do:

    LD (HL),N
    INC L

    It's 14 tstates, slower than PUSH but faster than LDI and goes in the same direction as raster
    Ralf Ralf July 2012 Development
  • 64x48 full colour graphicsHow feasible is this? Could an interrupt-driven routine be used to, for example, fill the top two thirds with a 64x32 blocky picture and leave the bo…

    ... desperately to get some more tstates.

    I'll work ...
    Ralf Ralf July 2012 Development
  • 64x48 full colour graphicsHow feasible is this? Could an interrupt-driven routine be used to, for example, fill the top two thirds with a 64x32 blocky picture and leave the bo…

    ... -10+7+10+7 =34 tstates. At the beginning I was ... is just 10+16=26 tstates. Much better.

    I ...
    Ralf Ralf July 2012 Development
  • 64x48 full colour graphicsHow feasible is this? Could an interrupt-driven routine be used to, for example, fill the top two thirds with a 64x32 blocky picture and leave the bo…

    ...

    ;; Top border ~ 14366 tstates
    ;; Is there a cleaner ...
    na_th_an na_th_an July 2012 Development
  • T-States?Can anyone point me to any good reading (or summarise) that will explain exactly what a tstate is? At the moment for me, tstates are a useful gauge …

    tstates are root of all evil!
    Arda Arda July 2012 Development
  • [NEW] Speccy for Android ReleasedHello, All! A while ago, I have released the Android version of [i]Speccy[/i], my ZX Spectrum emulator. It emulates Spectrum 16k, 48k, 128k, +2, +2A…

    ... rate is fully synchronized with 50Hz spectrum screen and result is ...
    Pegaz Pegaz July 2012 Emulators
  • Zymosis -- WTFPL'ed Z80 Emulation Corebreaking news! i'm back with another useless project: new Z80 emulation core written in pure C! i hear you screaming: "oh, no! WHY?!" let me tell yo…

    ... code somehow to use the tstates and next_event_tstate fields of the ...
    Shiru Shiru July 2012 Emulators
  • Zymosis -- WTFPL'ed Z80 Emulation Corebreaking news! i'm back with another useless project: new Z80 emulation core written in pure C! i hear you screaming: "oh, no! WHY?!" let me tell yo…

    [i]>[C++ Warning] zymosis.c(195): W8081 void functions may not return a value[/i]
    yes, it's a typo. just delete 'return', it's really 'void'.

    [i]>[C++ Warning] zymosis.c(968): W8008 Condition is always true[/i]
    no, that ...
    Ketmar Ketmar July 2012 Emulators
  • Zymosis -- WTFPL'ed Z80 Emulation Corebreaking news! i'm back with another useless project: new Z80 emulation core written in pure C! i hear you screaming: "oh, no! WHY?!" let me tell yo…

    ... you must correct z80->tstates in portIn and portOut callbacks ...
    Ketmar Ketmar July 2012 Emulators
  • Zymosis -- WTFPL'ed Z80 Emulation Corebreaking news! i'm back with another useless project: new Z80 emulation core written in pure C! i hear you screaming: "oh, no! WHY?!" let me tell yo…

    ... ' callback and should not modify 'tstates' in port i/o callbacks ...
    Ketmar Ketmar July 2012 Emulators
  • Spectrum Emulator that supports low resolutions and runs smoothlyHello to All, I have been trying to find a spectrum emulator that will work well through my CRT TV (using RGB to Scart) Most emulators seem to supp…

    ... 312 line video signal at 50Hz and that 8 lines are ...
    guesser guesser July 2012 Emulators
  • The need of having a 257-byte table for IM2 routinesThis came from a discussion at the speccy.org forum. I have understood that the reason behind the 257-table for IM 2 routines is due to certain joys…

    ... to be run on the 50Hz interrupt (additional interrupts may make ...
    Winston Winston August 2012 Development
  • Performance Analyser?Disclaimer: Im asking this question as a "non-programmer" so please forgive my ignorance if this turns out to be a daft question. During the life-sp…

    ... as I could on a 50Hz counter to the original pacman ...
    Gedlion Gedlion August 2012 Development
  • Work out attribute location in MCHow do I go about writing a MC routine which calculates the attribute address from a set of PRINT co-ordinates. I know you in basic you multiply the…

    ... />
    It could be 4 tstates faster if you have room ...
    Shiru Shiru August 2012 Development
  • SPECTRA New from Paul FarrowLooks good! Read about it [URL="http://www.fruitcake.plus.com/Sinclair/Spectrum/Spectra/SpectraInterface.htm"]here[/URL]

    ... using that clock and the 50Hz INT signal would be enought ...
    mcleod_ideafix mcleod_ideafix August 2012 Sinclair Miscellaneous
  • SPECTRA New from Paul FarrowLooks good! Read about it [URL="http://www.fruitcake.plus.com/Sinclair/Spectrum/Spectra/SpectraInterface.htm"]here[/URL]

    ... a visual distinction between the 50Hz (PAL) rendering of the two ...
    BloodBaz BloodBaz August 2012 Sinclair Miscellaneous
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