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Search Again :: Adv Search 1000 results in 0.009s
<1234567…34>
  • problem using FRAMES to generate 'random' numbersI realise the pros use bytes from ROM to get their random numbers, presumably because they want to use FRAMES to synchronise the printing and avoid s…

    ... also look at an LFSR (linear feedback shift register), especially if you're only ... z80 than the ones above (linear-congruential method).

    You ...
    Alcoholics Anonymous Alcoholics Anonymous March 2008 Development
  • Disappearing/appearing effectI remember doing a small routine in BASIC which could be used to cover the attributes section randomly, until all 704 characters were filled with the…

    And here is a method that is much, much better.

    [code]
    #include

    int galLFSR(int state)
    {
    static int lfsr;

    if (state)
    lfsr = state;
    else
    lfsr = (lfsr ^ (-( ...
    Alcoholics Anonymous Alcoholics Anonymous March 2008 Sinclair Basic
  • Routine for clearing screenI was looking for a 'nice' way of clearing a screen of graphics in Z80. After a ridiculous amount of time mucking around, this is the best and most …

    ... ://en.wikipedia.org/wiki/Linear_feedback_shift_register]Linear feedback shift register[/url]).

    ... Input: DE contains 16-bit register to "shift"
    ; Output: DE ... contains shifted register
    LFSR16:
    ...
    BloodBaz BloodBaz March 2012 Development
  • Routine for clearing screenI was looking for a 'nice' way of clearing a screen of graphics in Z80. After a ridiculous amount of time mucking around, this is the best and most …

    ... ://en.wikipedia.org/wiki/Linear_feedback_shift_register]Linear feedback shift register[/url]).
    [/QUOTE]

    Arjun Arjun March 2012 Development
  • Routine for clearing screenI was looking for a 'nice' way of clearing a screen of graphics in Z80. After a ridiculous amount of time mucking around, this is the best and most …

    ... ://en.wikipedia.org/wiki/Linear_feedback_shift_register]Linear feedback shift register[/url]).[/QUOTE]

    Clever ...
    Morkin Morkin March 2012 Development
  • Non-repetitive RNDHi guys) Perhaps, some of you already encountered a situation, when one needed a set of [b]unique [/b](pseudo-)random values, say, from zero to 25…

    ... do this with an lfsr (linear feedback shift register). It will go through the ...
    Alcoholics Anonymous Alcoholics Anonymous November 2018 Sinclair Basic
  • Animated attribute revealA new challenge to solve next. I would like to create an animated attribute reveal in machine code by having my 768 byte attributes held in ram whic…

    ... /lfsr/lfsr_table.pdf]Table of Linear Feedback Shift Registers[/url]. There's an ...
    Battle Bunny Battle Bunny February 2014 Development
  • Rocky Gush Floppy Drive InterfaceI have a Rocky Gush Floppy Drive Interface which I would like to post the details under the Hardware section of the website. What is correct procedur…

    Thanks for all the feedback. I did not design the ... the VCC of the 74LS164 shift register (U11) is connected via a ... dropped with the LED, the shift register switch slower and hence the ...
    Pierre Pierre March 2013 Hardware
  • Rocky Gush Floppy Drive InterfaceI have a Rocky Gush Floppy Drive Interface which I would like to post the details under the Hardware section of the website. What is correct procedur…

    ... ;687851]Thanks for all the feedback. I did not design the ... the VCC of the 74LS164 shift register (U11) is connected via a ... dropped with the LED, the shift register switch slower and hence the ...
    zub zub March 2013 Hardware
  • ZX80 and 81 hardware questionsI'm finding a lot of the documentation that is ostensibly about the hardware of the ZX80 and 81 to be primarily about the software. I was hoping some…

    ... a load of the video shift register, which is loaded from an ...
    Thommy Thommy September 2011 Hardware
  • another c64 vs. Speccy site...[url]http://c64vsspectrum.com/[/url] 25 years and we are still brawling.. ;)

    ... hardware at all except a shift register -- the display being generated by ...
    Alcoholics Anonymous Alcoholics Anonymous December 2007 Games
  • another c64 vs. Speccy site...[url]http://c64vsspectrum.com/[/url] 25 years and we are still brawling.. ;)

    ... hardware at all except a shift register -- the display being generated by ...
    Dwayne Dibley Dwayne Dibley December 2007 Games
  • Disappearing/appearing effectI remember doing a small routine in BASIC which could be used to cover the attributes section randomly, until all 704 characters were filled with the…

    ... 'd need a 16-bit shift register.

    [quote]
    How ... taps for any n-bit shift register. Other taps, of course, will ... maximal taps for variously-sized shift registers.

    I tried ...
    Alcoholics Anonymous Alcoholics Anonymous March 2008 Sinclair Basic
  • So you need to double (or triple, or quadruple) the clock speed...No particular reason for posting this, other than I was looking at an eZ80 evaluation board that does this, and that jogged my memory of a project I'…

    ... the output side of the shift register just see the Z80 I ...
    Winston Winston June 2010 Hardware
  • ZX80 and 81 hardware questionsI'm finding a lot of the documentation that is ostensibly about the hardware of the ZX80 and 81 to be primarily about the software. I was hoping some…

    ... will be loaded to the shift register. Internal RAM provides the contents ...
    Thommy Thommy September 2011 Hardware
  • AY-3-8912 emulationI am trying to improve the emulation of the AY-3-8912 in FBZX wii. I studied the code of some emulators and read some documents. I would like to be…

    ... a 17-bit shift */
    /* register. The input to the shift register is bit0 ... three shifts of the */
    /* register, what now is bit3 will ...
    Arjun Arjun June 2012 Emulators
  • AY-3-8912 emulationI am trying to improve the emulation of the AY-3-8912 in FBZX wii. I studied the code of some emulators and read some documents. I would like to be…

    ... should be a 16 bit shift register with an input (bit 16 ...
    Oibaf Oibaf June 2012 Emulators
  • AY-3-8912 emulationI am trying to improve the emulation of the AY-3-8912 in FBZX wii. I studied the code of some emulators and read some documents. I would like to be…

    ... should be a 16 bit shift register with an input (bit 16 ...
    Patrik Rak Patrik Rak June 2012 Emulators
  • AY-3-8912 emulationI am trying to improve the emulation of the AY-3-8912 in FBZX wii. I studied the code of some emulators and read some documents. I would like to be…

    ... gets shifted out of the register. Disregarding the output delay, saying ... is fed back to the shift register. The MAME guys seem to ...
    Patrik Rak Patrik Rak June 2012 Emulators
  • AY-3-8912 emulationI am trying to improve the emulation of the AY-3-8912 in FBZX wii. I studied the code of some emulators and read some documents. I would like to be…

    ... is fed back to the shift register. The MAME guys seem to ...
    Arjun Arjun June 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...

    ... sequence the usual way is shift register and read CY flag
    shift by one bit left
    Shift and add chapter.

    catmeows catmeows July 2012 Development
  • Odd / interesting things to do with Spectrums, IF1 and Microdrives.Firstly, I did not know where to put this, whether to shoe horn it into one of the more recent microdrive-ish threads, or drag up one of my old ones.…

    ... is essentially an eight bit shift register (with a single ?bit? in ... drive might simply extend the shift register to a ninth ?position? ? but ...
    RST#08 RST#08 July 2012 Hardware
  • Low level microdrive programmingSo I'm on my lunch break trying to find out about low level microdrive programming (without using IF1 ROM). I see one can use port 0xe7 to read and w…

    ... ]

    Basically, exists a shift register and each bit controls a ... on COMMS_DATA and displaces the register using COMMS_CLK. Both signals aren ...
    zx81 zx81 July 2012 Development
  • Add horizontal hardware scroll to ULA+In this case we must read a bit in the ULA+ for test if supported. And the future software that uses it must have to branch: 1. If hardware scroll i…

    ... /Border with a 8 bit shift register and 8 to 1 multiplexor ...
    antoniovillena antoniovillena July 2012 Development
  • 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…

    ... loaded into the display byte shift register and attribute latch on the ... out of the display byte shift register on the next CLK7 cycle ...
    guesser guesser August 2012 Emulators
  • 80x24 mode (Timex required)Hopefully Martijn will be adding this to the archive soon, but until then grab it here: [url]https://dl.dropbox.com/u/15659782/BASIC80.zip[/url] Th…

    ... be routed to the pixel shift register, both minor changes. They toggle ...
    csmith csmith August 2012 Sinclair Basic
  • AY-3-8912 emulationI am trying to improve the emulation of the AY-3-8912 in FBZX wii. I studied the code of some emulators and read some documents. I would like to be…

    ... volume.
    8 ) If the register 13 (envelope shape) is written ... cycle.
    9) Changes to register 6 (noise period) take effect ... is fed back to the shift register: b0^b2, b0^b3, ~(b0 ...
    Oibaf Oibaf August 2012 Emulators
  • Revisiting Spectrum CPU clock regenerationWarning: This post will be a bit nerdy :-) Some time ago, I experimented with phase locked loop circuits as a possible way to regenerate the Spectru…

    ... be possible to have a shift register recording the history of the ... clock signal to feed this shift register contents back into the PLL ... not need a very long shift register as the clock is not ... 1.5 cycles then the shift register output is feed into the ...
    shammster shammster September 2012 Hardware
  • Video generation using a CPUWe know it is possible to generate a video signal using a CPU, and this technique was often used on low-end computers in the early 1980's (for exampl…

    ... with an internal 3 bit register in the ULA which tells ... to 7) and the i register which normally points to the ... by bit via an internal shift register during the next eight cycles ...
    Matt_B Matt_B January 2013 Chit chat
  • maximum addressable RAM for a Z80 using bank switching?What is the maximum addressable RAM for a Z80 using bank switching? The Enterprise64 home computer could address up to 4MB, is this the limit for a …

    ... 8 bit parallel load shift register daisy chained onto an ... n-8 stage shift register, where n is the ... of the address, then shift it all out into ... of the daisy chain of shift registers, then repeat as ... bit that clears the shift register so that you don' ...
    guesser guesser February 2013 Hardware
<1234567…34>

Latest Posts

  • I am currently watching.....
    Paradigm Shifter on 12:49AM
  • New video about S-video modification on Issue two 48K Spectrum.
    Renegade on April 21
  • Fixed Speccy Software. And which games remained unfixed?
    John Elliott on April 21
  • Happy 40th Birthday to the Amstrad CPC464!
    rich_chandler on April 21
  • Another Birthday! The Game Boy Is 35!
    mel the bell on April 21
  • European Software Titles with an English version
    harriusherbartio on April 21
  • Elusive Strategy Games done by the Smaller or less Prolific Software Houses.
    harriusherbartio on April 21
  • 1992 Spectrum Software
    harriusherbartio on April 21
  • +3 Disk drive motor
    AndyC on April 21
  • Celebrity deaths...
    mel the bell on April 20

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feedback 3K 3.8K
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