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<1234567…34>
  • My attempt to restore the CPU clock signalI know Winston has already got this, but I can't see any thread with details about it. Only wanted to share my (still early) results. I'm not taking…

    ... /> Having a CPU in-phase clock signal is needed ... is the restored CPU signal clock, with the ... same phase as seen by the CPU ... itsef, i.e, it's inverted with respect to the clock ... , // 28MHz input master clock
    input wire cpuclk_in_n ...
    mcleod_ideafix mcleod_ideafix September 2014 Hardware
  • Harlequin turbo mode ( 7 MHz )Hi, All. Sorry for my bad english. I make Harlequin mod - turbo mode ( CPU clock 7MHz ) for Harlequin. Could you be so kind to write your opin…

    ... /> I make Harlequin mod - turbo mode ( CPU clock 7MHz ) for Harlequin.
    Could you ... schematic.
    I tested on Harlequin 128K.

    [img]http ... connector ) is inverting CPUCLK , but Harlequin has different schematic : CLKB is ...
    tetroid tetroid May 2016 Hardware
  • 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…

    ... regenerate the Spectrum's clock signal despite contention. However ... produce the regenerated Spectrum clock, a stable and ... - one counting Spectrum clock cycles since contention started, ... and one counting regenerated clock cycles since contention started ...
    Winston Winston September 2012 Hardware
  • Harlequin clone...PCB manufactured!Using Chris Smith's detailed schematics and project notes from the Harlequin... a Speccy fan in the United States by the name of Don (Superfo) has de…

    ... is a revision F of harlequin ready for making new PCBs ... 7805 (cooler design)
    - inverted clock at edge connector for interfaces ... (rev. E had true CPU clock which is the false phase ... for a new lot of harlequin. If anybody is interested to ...
    ingo ingo August 2013 Hardware
  • Harlequin clone...PCB manufactured!Using Chris Smith's detailed schematics and project notes from the Harlequin... a Speccy fan in the United States by the name of Don (Superfo) has de…

    [U][B]Harlequin rev. F is ready - ... a revision F of harlequin ready for making new ... (cooler design)
    - inverted clock at edge connector for interfaces ... (rev. E had true CPU clock which is the false phase ... for a new lot of harlequin. If anybody is interested ...
    1024MAK 1024MAK August 2013 Hardware
  • Harlequin clone...PCB manufactured!Using Chris Smith's detailed schematics and project notes from the Harlequin... a Speccy fan in the United States by the name of Don (Superfo) has de…

    ... is a revision F of harlequin ready for making new PCBs ... 7805 (cooler design)
    - inverted clock at edge connector for interfaces ... (rev. E had true CPU clock which is the false phase ... for a new lot of harlequin. If anybody is interested to ...
    flopping flopping August 2013 Hardware
  • Harlequin clone...PCB manufactured!Using Chris Smith's detailed schematics and project notes from the Harlequin... a Speccy fan in the United States by the name of Don (Superfo) has de…

    ... changed one signal at the harlequin after a dialog with Chris ... of some signals. Now the harlequin also works with my RGB ... found no further issue. The Harlequin obviously works with MB02+ as ... as with divIDE (Residos). The cpu clock at the edge connector is ...
    ingo ingo November 2013 Hardware
  • ULA snow effectIt's wintertime, you know. [quote="http://ramsoft.bbk.org.omegahg.com/floatingbus.html"]when the I register falls in the range 0x40-0x7F then the UL…

    ... first byte fetch (equivalent to Harlequin's AL1) and then the ... for the second byte fetch (Harlequin's AL2). The RAS is ... the rising edge of the CPU clock while MREQ is low - indicating ... next rising edge of the CPU clock when MREQ is high, which ...
    antoniovillena antoniovillena January 2014 Development
  • important Harlequin modWhile searching for a better solution for avoiding undesired spikes that corrupt the screen RAM at Harlequin I found a final solution. No additional …

    ... hardware (discrete chips at harlequin), while the CPU clock ist stopped. The second ... can be used by the CPU without conflict with other hardware ...
    ingo ingo March 2015 Hardware
  • Nokia N810 internet tabletI saw some discussion of Nokia internet tablets on here a while ago, so I know at least some WOSers have one or have an interest in them. I've just …

    ... it, the N800 has its CPU clock speed increased from 330 to ...
    neoncherry neoncherry January 2008 Chit chat
  • ZX Spectrum Woes...In my endeavours to get my second Spectrum (Issue 3) working I have replaced the CPU, memory and lower ram. I have fitted sockets for the CPU and me…

    ... working I have replaced the CPU, memory and lower ram. ... fitted sockets for the CPU and memory to minimise ... in thinking that the CPU clock signal provided by the ... ULA is the 14MHz ULA clock signal divided by four? ... have expected if the clock is more or less ...
    weathereye weathereye March 2011 Hardware
  • Brief report about RetroEncounterAnother April... another retro event! (Firstly sorry for the quality of the photos, owing to not being able to find my camera battery before leaving …

    ... allows you to turn the CPU clock frequency up and down, all ...
    Winston Winston April 2011 Sinclair Miscellaneous
  • WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…

    ... track that carries the configuration clock from the FPGA to the ... of this, I've routed clock tracks first (to get them ... is fully configured and the CPU clock is working, the machine won ...
    mcleod_ideafix mcleod_ideafix August 2012 Hardware
  • Standard for upgrading the original ZX Spectrum[B][U]1. Easily connect external ULA and video RAM.[/U][/B] [url]http://zx.clan.su/forum/8-102-576-16-1352476666[/url] The method consists in blocki…

    ... method consists in blocking the CPU clock of the ULA, and connect ... the external clock frequency. To connect an external ... clock to the processor, it is ... the conductor to pin clock CPU. To lock the clock on the ULA ...
    Black_Cat Black_Cat November 2012 Hardware
  • AY 8912 QuestionI got some problem... Does anyone have a formula to convert from Hz / kHz to the Pitch value of AY Sounchip of Spectrum? Please help...

    Thanx, I got it! The formula is; pitch=1760000/(hz*16). The Oscilator frequency of AY in Spectrum is 1.76 Mhz (half of CPU clock)... So the Pitch for a 50 Hz tone is 2200
    LCD LCD July 2002 Sinclair Miscellaneous
  • ZX Spin 0.4 available for Download.Standard Cut-n-Paste from the CSS post: If all goes well, I'll upload it to WOS on monday. ----------------------------------------- Okay, it's th…

    ... field rate, by increasing the CPU clock speed, the result is comparable ...
    secarica secarica December 2002 Emulators
  • TimingHey All, Is their away of obtaining timing information on ZX128k other than addresses 23672->23674. Basically I would like to identify every 100th …

    ... , but your own timing routine (CPU clock tact).
    Vertical blank... I ...
    LCD LCD January 2004 Development
  • ZX in FPGA...Hmm..seems nobody is interested in a replacement PCB with FPGA...well..heading towards next FPGA projects then...C64 and others (o; [ This Messag…

    ... interface. CF slot etc. Switchable CPU clock 3.5/7/14/28 ...
    klingler klingler July 2004 Sinclair Miscellaneous
  • Clone Project feedbackFinally i now have some time to start again with my clone project. I have decided to drop the 48k project and go directly on a 128k clone. This migh…

    ... This will also enable the CPU to always run at full ... speed. The CPU and Video part will also ... the VGA timing from the CPU clock but i will implement ... it's. Since the CPU always runs at full speed ... one-function-per-pcb approach (CPU, video, CF, other io, ...
    pern pern September 2004 Sinclair Miscellaneous
  • Sparky eZX-BASIC Project in need of FPGA ExpertYou probably are not familiar with this project, but it is a computer system based on Zilog's new eZ80 chip and the OS is a superset of ZX BASIC. Ju…

    ... predicted and interlaced with the clock for easy video interfacing. ... any wait states programmed in) clock cycles to complete, the ... just can't invert the CPU clock to run the display ... databus multiplexer between display RAM, CPU and VGA logic...
    ...
    Sparky Sparky October 2004 Sinclair Miscellaneous
  • Will Spectrum run @ 60Hz?Sorry to overlap w/ my other recent post, but want to know, if I grab a Spectrum and use it in America with a voltage converter or a different power …

    ... that has the master 14Mhz clock split once to provide 7MHz ... TV picture from its own clock surely.
    [/quote]

    cpu clock and 50/60Hz vertical blanking ...
    Alcoholics Anonymous Alcoholics Anonymous November 2004 Sinclair Miscellaneous
  • Has this been done before?Are there any emulators whose speed can be adjusted by the Spectrum program that the emulator itself is running? So that, say the Spectrum program ca…

    ... about, if you raise the cpu clock speed (not just speed up ... order to multiply the Z80 CPU speed, in MHz.
    By ...
    Arm73 Arm73 April 2006 Emulators
  • A hyperthetical Speccy FutureDo you think if the Speccy had've continued through the 90's or maybe up until present day, that maybe they would've made multi-button joysticks/pads…

    ... anything will ever have a clock of 2400Ghz is unlikely to ... today is powerful graphic card. CPU sends there not so much ... that we are near to CPU clock limits with silicon, but power ...
    piters piters April 2006 Sinclair Miscellaneous
  • Dead Spectrum diagnosis and desolderingI have two dead Spectrums - one I'm pretty sure is caused by bad memory, and the other - well, perhaps a bad ROM, perhaps a bad CPU (it gets halfway …

    ... doing something, and that the CPU clock is running. I tried the ...
    Winston Winston December 2006 Hardware
  • Dead Spectrum diagnosis and desolderingI have two dead Spectrums - one I'm pretty sure is caused by bad memory, and the other - well, perhaps a bad ROM, perhaps a bad CPU (it gets halfway …

    ... doing something, and that the CPU clock is running. I tried the ...
    DEATH DEATH December 2006 Hardware
  • 48k one dead, one dodgyhello everyone. I have 2 48k spectrum +'s (the one with the QL case). Both boards have issue 3B on them near the speaker. The first will power up …

    ... useful for discovering whether the CPU clock is running OK, and seeing ... if lines off the CPU were doing anything useful (checking ...
    Winston Winston December 2006 Hardware
  • ZXSP Emulator running too fastHi All, I was wondering if any of you have had a problem whereby the zxsp emulator runs too fast so won't load games etc? For example, when loading…

    ... />
    Have you checked the CPU Clock Predivider is set to ULA ... Clock divided by 4 and the ...
    Pengwin Pengwin January 2007 Emulators
  • Running code from the display memory?Is it possible to run machine code from the memory area used by the display file? If you were really out of memory and some part of screen is not u…

    ... a bit faster due to CPU clock (3.5 vs 3.54MHz ...
    omega omega May 2007 Development
  • 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…

    ... the clock signal is making it to the CPU with ... scope, also check various CPU signals are doing something ... can disconnect the system clock off your Z80 computer ... , and use the clock signal supplied by the ... ULA will stop the CPU clock when contention occurs). That ...
    Winston Winston May 2007 Hardware
<1234567…34>

Latest Posts

  • I am currently watching.....
    Paradigm Shifter on 12:49AM
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    Renegade on April 21
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    John Elliott on April 21
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    rich_chandler on April 21
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    mel the bell on April 21
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    harriusherbartio on April 21
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    harriusherbartio on April 21
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  • +3 Disk drive motor
    AndyC on April 21
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