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<1…17181920212223…34>
  • Spectrum AssemblyHi All, Thanks for letting me in... lol Over the last couple of days I started playing my spectrum emu again and then I started thinking about lear…

    ... , I mean only the method. LDI again with corrections for the ...
    omega omega October 2008 Sinclair Miscellaneous
  • Spectrum AssemblyHi All, Thanks for letting me in... lol Over the last couple of days I started playing my spectrum emu again and then I started thinking about lear…

    Already posted, but there is no point in it... It can't be improved, only with replacing LDIR with number of LDI, but this is not "improvement". Just wanted to have other codes of the same procedure, but as I realized now, no one is interested in it.
    Shadow Maker Shadow Maker October 2008 Sinclair Miscellaneous
  • Spectrum AssemblyHi All, Thanks for letting me in... lol Over the last couple of days I started playing my spectrum emu again and then I started thinking about lear…

    ... )
    ld de, (lines)
    ldi x32
    ld hl, (lines ... /> ld de, (lines+2)
    ldi x32
    ...
    repeat for ... /> ld de, (lines+380)
    ldi x32

    ... rest of ...
    Matt_B Matt_B October 2008 Sinclair Miscellaneous
  • Spectrum AssemblyHi All, Thanks for letting me in... lol Over the last couple of days I started playing my spectrum emu again and then I started thinking about lear…

    ... )
    ld de, (lines)
    ldi x32
    ld hl, (lines ... /> ld de, (lines+2)
    ldi x32
    ...
    repeat for ... /> ld de, (lines+380)
    ldi x32

    ... rest of ...
    Shadow Maker Shadow Maker October 2008 Sinclair Miscellaneous
  • Spectrum AssemblyHi All, Thanks for letting me in... lol Over the last couple of days I started playing my spectrum emu again and then I started thinking about lear…

    ...
    ld de, #4000
    ldi x 32
    hl, #4200 ...
    ld de, #4100
    ldi x 32
    ...
    [/code ...
    Shadow Maker Shadow Maker October 2008 Sinclair Miscellaneous
  • Fast screen writesI wondered what the faster than LDIR methods of writing to the screen were.

    ... to use a amount of LDI commands (for example 32 of ...
    LCD LCD October 2008 Development
  • Spectrum AssemblyHi All, Thanks for letting me in... lol Over the last couple of days I started playing my spectrum emu again and then I started thinking about lear…

    ... )
    ld de, #4000
    ldi x 32
    ld hl ... )
    ld de, #4100
    ldi x 32
    ...
    [/code ...
    ld de, #4000
    ldi x 32
    pop hl ...
    ld de, #4100
    ldi x 32
    ...
    [/code ...
    omega omega October 2008 Sinclair Miscellaneous
  • Fast screen writesI wondered what the faster than LDIR methods of writing to the screen were.

    ... times
    INC E ;
    LDI ;
    LD E, B ;
    INC E ;
    LDI ;
    LD E, B ;
    FrankT FrankT October 2008 Development
  • Fast screen writesI wondered what the faster than LDIR methods of writing to the screen were.

    ... /> LDIR 21 T/byte
    LDI 16.xx T/byte
    Fikee Fikee October 2008 Development
  • Fast screen writesI wondered what the faster than LDIR methods of writing to the screen were.

    ... get clobbered by the memory contention in the screen ram which ... 16K will be clobbered by contention repeatedly, if it's repeatedly ...
    Winston Winston October 2008 Development
  • Fast screen writesI wondered what the faster than LDIR methods of writing to the screen were.

    ... ;308952]I can solve the contention issue by paging in shadow ... /> I wouldn't worry about contention too much though, so long ...
    Matt_B Matt_B October 2008 Development
  • Fast screen writesI wondered what the faster than LDIR methods of writing to the screen were.

    ... ;308952]I can solve the contention issue by paging in shadow ... /> I wouldn't worry about contention too much though, so long ...
    BloodBaz BloodBaz October 2008 Development
  • Fast screen writesI wondered what the faster than LDIR methods of writing to the screen were.

    ... . For a full description of contention, I'd recommend that people ...
    Matt_B Matt_B October 2008 Development
  • Fast screen writesI wondered what the faster than LDIR methods of writing to the screen were.

    ... . For a full description of contention, I'd recommend that people ...
    Philip Kendall Philip Kendall October 2008 Development
  • Question about digitized sound and videoI searched the forums and couldn't find the answer, so here it goes. Regarding digitized sound: I remember reading an article long ago about a vid…

    ... delta player without LDIR as LDI cannot be controled in such ...
    LCD LCD November 2008 Development
  • Question about digitized sound and videoI searched the forums and couldn't find the answer, so here it goes. Regarding digitized sound: I remember reading an article long ago about a vid…

    ... in some comments about "the LDI jump table trick", so it ... a table of (say) 128 LDI instructions (or actually INI instructions ...
    gasman gasman November 2008 Development
  • Which computer is most similar to Zx Spectrum?I have wondered recently wihch other 8-bit computer is most of all similar to Zx Spectrum. I mean similar graphics, similar gameplay, similar program…

    ... the CPU; this avoids memory contention but stops you from directly ...
    Matt_B Matt_B November 2008 Sinclair Miscellaneous
  • what were the things the Speccy architecture was good for?I don't know a hell of a lot about all the different computers hardware and I wanted to know if the way the Spectrum was built lent itself to certain…

    ... this is exacerbated by memory contention between it and the video ...
    Matt_B Matt_B November 2008 Sinclair Miscellaneous
  • Question about digitized sound and videoI searched the forums and couldn't find the answer, so here it goes. Regarding digitized sound: I remember reading an article long ago about a vid…

    ... two frames ago.
    The LDI Table is a nice idea ... it needs more than 255 LDI commands, as BC Byte count ... reduce the number of needed LDI (or INI for reading from ...
    LCD LCD November 2008 Development
  • what were the things the Speccy architecture was good for?I don't know a hell of a lot about all the different computers hardware and I wanted to know if the way the Spectrum was built lent itself to certain…

    ... , it loses more to memory contention so that tends to even ...
    Matt_B Matt_B November 2008 Sinclair Miscellaneous
  • what were the things the Speccy architecture was good for?I don't know a hell of a lot about all the different computers hardware and I wanted to know if the way the Spectrum was built lent itself to certain…

    ... faster, having no screen memory contention combined with the 6502's ...
    Jimmy Jimmy November 2008 Sinclair Miscellaneous
  • RGB on speccy ?hi, just a question : are you aware of scene demo trying emulate rgb ? i was a bit ill last few days so laying in bad i come with a (stupid ?) idea.…

    ... it wasn't for memory contention.
    gasman gasman November 2008 Development
  • RGB on speccy ?hi, just a question : are you aware of scene demo trying emulate rgb ? i was a bit ill last few days so laying in bad i come with a (stupid ?) idea.…

    ... it wasn't for memory contention.[/quote]
    Don't you ...
    omega omega November 2008 Development
  • RGB on speccy ?hi, just a question : are you aware of scene demo trying emulate rgb ? i was a bit ill last few days so laying in bad i come with a (stupid ?) idea.…

    ... on a real Spectrum, memory contention eats up too much time ...
    gasman gasman November 2008 Development
  • Fuse for Mac OS X beta releasesA beta version of Fuse for Mac OS X has been released at the dedicated sourceforge project: [url]http://sourceforge.net/projects/fuse-for-macosx/[/u…

    ... (but probably not perfect) TS2068 contention (Philip Kendall).
    [*] Various other ...
    Fred Fred November 2008 Emulators
  • ZX Spectrum (16K) sound/beepHi all, I think I'm in right place now, I've tried to find an answer how to generate two channel sound using ZX Spectrum 16K. Only think I've found …

    ... will get hit by memory contention which will tend to distort ...
    Matt_B Matt_B November 2008 Sinclair Basic
  • ZX Spectrum (16K) sound/beepHi all, I think I'm in right place now, I've tried to find an answer how to generate two channel sound using ZX Spectrum 16K. Only think I've found …

    ... an example of how bad contention is, try using the Magical ... sounds awful in Spin with contention turned on though; music for ... timing loops to take memory contention into account. That's probably ...
    Matt_B Matt_B November 2008 Sinclair Basic
  • ZX Spectrum (16K) sound/beepHi all, I think I'm in right place now, I've tried to find an answer how to generate two channel sound using ZX Spectrum 16K. Only think I've found …

    ... sounds awful in Spin with contention turned on though; music for ... timing loops to take memory contention into account. That's probably ...
    jp44 jp44 November 2008 Sinclair Basic
  • Machine code help pls: LDI example[deleted]

    ... =15, BC=24

    LDI copies the contents of address ...
    SkoolKid SkoolKid November 2008 Development
  • Machine code help pls: LDI example[deleted]

    SkoolKid is correct, except for his first sentence :-)

    Yes, it is a typo. The end result of an LDI will indeed be DE=10, HL=16 - [b]not[/b] HL=10, DE=16 - as per the reasoning you've both given.
    gasman gasman November 2008 Development
<1…17181920212223…34>

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