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<1234567…34>
  • Investronica Inves Spectrum +Hi, Has anyone here ever heard of the Investronica Inves Spectrum +? This site [url="http://www.silicium.org/uk/sinclair/inves.htm"]http://www.sili…

    ... useful cooler. The quartz crystal system clock gives 17.345 Mhz which ...
    na_th_an na_th_an June 2005 Sinclair Miscellaneous
  • Its all crap!I don't know what, or why. I just wanted to say something controversial. And make a pointless post to pass the time away while I'm supposed to be wo…

    ... a 24 hour period my system clock loses 10mins. I have to ... every day to reset the clock.

    If I left ...
    Lee Fogarty Lee Fogarty June 2005 Chit chat
  • The Sing-clair ProjectFollowing on in a way from [url=http://www.worldofspectrum.org/forums/showthread.php?t=11800]this[/url] thread, I have had an idea. How about if we …

    ... 's something wrong with my system clock I think (pathetic reference to ...
    Where's that AY chip gone... Where's that AY chip gone... May 2006 Chit chat
  • You know how the 128K was faster than the 48K Spectrum?Regarding how the Spectrum 128K ran at 3.54 MHz rather than the 48K's 3.5MHz, was this difference enough to be an advantage? If not, then surely Sinc…

    ... CoCo 3 implemented a higher clock speed but could still run ... .

    Some other MHz clock could be used such as ... but a multiple of the system clock works best.
    JamesD JamesD September 2006 Hardware
  • You know how the 128K was faster than the 48K Spectrum?Regarding how the Spectrum 128K ran at 3.54 MHz rather than the 48K's 3.5MHz, was this difference enough to be an advantage? If not, then surely Sinc…

    ... CoCo 3 implemented a higher clock speed but could still run ... software.
    Some other MHz clock could be used such as ... but a multiple of the system clock works best.[/quote]

    clock![/B]... Especially the [B]CIRCLE ...
    Marcelo Marcelo September 2006 Hardware
  • Unconventional way of diagnosing a faultHi everyone Some time ago I got a 48k Spectrum (issue 3B board) in a pretty bad condition. I believe the power supply transistor TR4 failed, causing…

    ... that.

    check the clock signal is making it to ... , if you can disconnect the system clock off your Z80 computer, and ... use the clock signal supplied by the ULA ... ULA will stop the CPU clock when contention occurs). That will ...
    Winston Winston May 2007 Hardware
  • Unconventional way of diagnosing a faultHi everyone Some time ago I got a 48k Spectrum (issue 3B board) in a pretty bad condition. I believe the power supply transistor TR4 failed, causing…

    ... />
    [QUOTE]
    check the clock signal is making it to ... , if you can disconnect the system clock off your Z80 computer, and ... use the clock signal supplied by the ULA ... ULA will stop the CPU clock when contention occurs). That will ...
    Avian Avian May 2007 Hardware
  • It's a trap!So I got a CPLD (not the eventual one I want to use for the ethernet project - rather, one I actually have here and now, an XC9536 in a PLCC44). And…

    ... flop instead operates as a clock enable. This causes the ... of the 3.5 MHz system clock (the Z80 deasserts RD ... the falling edge of the system clock (on memory reads, RD ... 3rd T-state's clock cycle). This means the ... stays valid for 1 clock cycle, which means when ...
    Winston Winston December 2007 Hardware
  • More on Randomize commandI always used to use randomize xxxxx then peek 23670 and 23671 to turn a 16 bit number into 2 8 bit numbers but only noticed yesterday that randomize…

    It's the same as RANDOMIZE without an argument i.e. sets the random seed based on the system clock, I believe. Therefore you should get a random value from the sysvars.

    You need to make zero a special case.
    Paradigm Shifter Paradigm Shifter December 2009 Sinclair Basic
  • Is there any video input on expansion bus?Imagine you want to build a custom display hardware, for instance, to add hardware sprites to display. Is it possible to design such a device so that…

    ... should have the original 14MHz clock available, which we haven't ... to generate our own pixel clock, and this is bad, because ... of PLL.

    The system clock (3.5MHz) is the best ... twice the frequency of the system clock. It's available at the ...
    mcleod_ideafix mcleod_ideafix March 2010 Hardware
  • Curious "Pud-Pud" screenshotYou may notice of a curious screenshot made for this article appeared at Microhobby magazine (the one at the bottom left) from Jonathan "Joffa" Smith…

    ... on about. For any given system, if you can describe ... every single rule governing that system, then the state of ... numbers - base them off a system clock of sufficient resolution (say, milliseconds ... been recorded, and the system time is determined at startup ...
    Willy Willy July 2010 Games
  • 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…

    ... half the frequency of the clock, but that varies by machine ... own clock or just halves the system clock. The Fuller derives its clock and ...
    chev chev June 2012 Emulators
  • Spectrum 128 toaster and divide incompatibility problems with some demos and games.Okay so I got this thing now. It?s my first Spectrum ever. [img]http://img836.imageshack.us/img836/2016/speccyl.jpg[/img] [url]http://img824.image…

    ... output level of the inverted system clock. But only a few interfaces ... like MB02+ may use this clock and do work with both ... and wait states instead of clock control and are not compatible ...
    ingo ingo August 2012 Sinclair Miscellaneous
  • Pentagon RAM memoryDoes anybody know or have reference to technical docs, how no contention on RAM access is achieved in Pentagon 128K clone ? Looking at schematics it …

    ... contended banks, reserving one 14MHz clock period to the ULA and ... the board a fast enough system clock... only 14MHz and 16MHz, and ... "... (i.e. to double the system clock frequency). We'll see :-)
    adorigatti adorigatti October 2012 Hardware
  • Double-Buffer ScreenFor my Alien Breed Speccy re-write I decided to use a Double Buffer (DB) or 'Back Screen' to draw all the game action onto, before shuffling the whol…

    ... every 8 ticks of the system clock whilst the main part of ...
    joefish joefish April 2014 Development
  • Grand Theft Auto dramaTheres a drama about the development of Grand Theft Auto called [url="http://www.bbc.co.uk/programmes/b06ccjn9"]The Game Changers[/url] tomorrow on B…

    ... this afternoon - cut the dev system clock wire.. cut it.. cut it ...
    Zoep Zoep September 2015 Chit chat
  • Z80, and 6502, in comparisonI was wondering about how each of these compared in terms of performance. The Commodore 64 had a 6502 @ 1MHz, and graphics processor VIC which took …

    ... VERY important point: the clock speed of the microprocessor is ... not the same as the system clock speed),
    [*]How useful ... , especially the actual video system and sound systems. So ... down to programmers skill and system knowledge ;)

    [ ...
    1024MAK 1024MAK December 2018 Hardware
  • Bit of fun - one change onlyI also posted this on another marque's forum (for their products) to see. Its just a bit of fun really. OK, if you could of made one change to a S…

    ... interleaving![/quote]
    The bus system used by 6502 microprocessors means ... interleave a memory mapped video system, as the 6502 does not ... bus for half of the system clock time. The Z80’s use ... like on a 6502 based system.

    I/O on ...
    1024MAK 1024MAK February 2019 Hardware
  • Z80, and 6502, in comparisonI was wondering about how each of these compared in terms of performance. The Commodore 64 had a 6502 @ 1MHz, and graphics processor VIC which took …

    ... is just how fast the system clock ticks. Some instructions take more ... />
    So given the same clock speed, the 6502 is going ... />
    So given the actual clock speeds, the Speccy has the ...
    joefish joefish February 2019 Hardware
  • random number generator without using rnd in basicwhat is the simplest way to generate random numbers in basic (0-255), without using the rnd statement? i also want it to always generate the same…

    ... , it will use the Spectrum system clock as the seed - that is ... is not robotic. And the system clock counts up to about 17 ...
    colonel32 colonel32 June 2019 Development
  • Spectrum +D Disk SystemHi I recently got a second hand Spectrum with a disk drive and the +D interface. The System disk worked alright for a while but now it has become cor…

    ... and the +D interface. The System disk worked alright for a ... a backup copy of the system disk as my whole games ...
    Chris Chris January 2002 Sales
  • printer port redirect to (Windows) system printerIs there any emulator (+2A/+3 compatible) that can be configured to output the, say, parallel printer port to the Windows system port ? The default o…

    ... printer port to the Windows system port ?
    The default one ...
    secarica secarica November 2002 Emulators
  • Anybody got a working Datel +d drive system?I am after a +d system.Does any one have one to offer? i can swap items or buy.Whichever takes your fancy>

    I am after a +d system.Does any one have one to offer? i can swap items or buy.Whichever takes your fancy>
    The Master The Master March 2003 Wanted
  • Sinclair Spectrum System Test Rom CartridgeSinclair Spectrum System Test Rom Cartridge. [url="http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&category=50224&item=8106735040&rd=1&ssPageName=W…

    Sinclair Spectrum System Test Rom Cartridge.

    [ ...
    wadsterboy wadsterboy May 2004 Sales
  • My collection for sale. Full list here!Here's the list of what I am selling. Please contact me at cheggersplayspop*@boltblue.com (remove the *) and make me an offer! TITLE PUBLISHER YEAR …

    ... worn
    Gregory Loses His Clock Mastertronic 1989 inlay seam split ... -issue
    Death Star Interceptor System 3 Software 1984
    Arc ...
    Steve B Steve B May 2004 Sales
  • XK SystemIn Your Spectrum issue 8 it mentions a hardware paging system called the XK system, this paged the top 32KB of memory. It allowed 4MB to be used and…

    ... mentions a hardware paging system called the XK system, this paged the ... be missing in action. The system seem to be inspired by ...
    speccyverse speccyverse July 2004 MIA/STP/SDP
  • Best games voting system -The "Best Games" right now shows Spectrum CP/M to be the "best game", when in fact it is not a game. Also isn't there something inherently wrong if…

    ... correct (terms entirely made up) system, which can do this. Is ... .

    IAC, perhaps the system needs to be updated? I ...
    Arjun Arjun August 2004 Sinclair Miscellaneous
  • Machine Code Sprites Example Code Using Char Based SystemBelow is my WIP code to do smooth screen wrapping sprites using char positions and offsets, as opposed to writing direct to a line (0-191) and shifti…

    ... as opposed to pixel based system

    ; ********************************************

    #define ...
    robpearmain robpearmain August 2004 Development
  • IM2 Machine Code Sprites Example Code Using Char Based SystemFurther to my earlier post, here are sprites running using char method with IM2 driving it Note, for 48k spectrum using TASM [code] ; ***********…

    ... as opposed to pixel based system

    ; ********************************************

    #define ...
    robpearmain robpearmain August 2004 Development
<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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