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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…
... reshaping the ugly shaped clock signal available from the rear ... give me a ininterrupted clock signal, filling the gaps where ... clock signal is needed for some devices, such as ZXMMC and DivMMC ...
From this restored clock signal, it's easier to syntesize ... -
ZX Spectrum Clock Signal Restorer Circuit[SIZE=5][U][B]ZX Spectrum Clock Signal Restorer Circuit[/B][/U][/SIZE] The circuit below is an experimental circuit. It has only been "tested" using…
... =5][U][B]ZX Spectrum Clock Signal Restorer Circuit[/B][/U][/SIZE ... -
zx spectrum +2A / +2B no clock signal or video display / gate array dead ?scratching my head with this sick specie .. it is a issue 4 .. i was hunting for R45 that goes between the clock signal of cpu and gate array,, but i…
... R45 that goes between the clock signal of cpu and gate array ... removed from this revision.. the clock also goes to the 74HCU04 ... but no sign of the clock . could this chip be killing ... the clock or is that pesky gate ... -
DivMMC clock bufferI have completed the first DivMMC EnJOY today: [url]http://www.worldofspectrum.org/forums/showthread.php?t=44238[/url] But there is a problem with t…
I have completed the first DivMMC EnJOY today:
[url]http:// ... is a problem with the clock boost circuit.
Mario ... the supply voltage in the DivMMC circuit; I will try lateron ... -
ZX Spectrum clock signals comparedI haven't searched for this on WoS; it might have been posted before. But I think it's important info, and can't do any harm to repeat or show from a…
... DivMMC EnJOY! interface: it has some problems with the ZX Spectrum clock signal ... .
With the original design the clock signal is inverted on the DivMMC ... which processes the clock signal, very likely to improve that clock signal.
But ... -
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…
... only the 3.5MHz clock signal at the edge connector. ... periods of contention, the clock signal we have at the edge ... nicely regenerate the Spectrum's clock signal despite contention. However, if ... the next Spectrum clock cycle, the regenerated signal is already ... -
ZX Spectrum 48k - no CLK signalHello I'm trying to repair ZX Spectrum 48 mainboard issue 3B. When i check signal with oscilloscope on X1 or on ULA pin 39. I get stable 2V no clock…
... 3B.
When i check signal with oscilloscope on X1 or ... be the cause of no clock signal?
regards
Maciek -
Reading Spectrum+ keyboard versus rubber keyI've started trying to learn Spectrum machine code after a 30 year break. I've encountered something that's puzzling me and I'm hoping that someone c…
... that some games loaded on DivMMC don't respond to the ... work with DivMMC due to a possible absence of a clock signal on ... -
zx spectrum +2 no clock signal ??help me ...... looking at a specie +2 (original +2) it is the Z70700 issue 1 (uk one) i seem to have no clock,no display,no sound at all. it is sho…
... ) i seem to have no clock,no display,no sound at ... to the cpu pin 6 (clock) and that pin 13 of ... -
DivMMC clock bufferI have completed the first DivMMC EnJOY today: [url]http://www.worldofspectrum.org/forums/showthread.php?t=44238[/url] But there is a problem with t…
... pass 74LVC14 and connect CLK signal direct to CPLD and it ... on a 48K, but the clock signal quality on a toastrack or ... me he has an improved clock inverter that doesn't need ... can be adopted by the DivMMC.
Hope hearing from him ... -
DivMMC EnJOY!Coming up... [IMG]http://benophetinternet.nl/hobby/vanmezelf/DivMMC_enjoy_first_render.jpg[/IMG]
... not caused by the clock signal at all.
... the DivMMC works great then (with the new clock inverter, ... the problems with the clock signal can only cause the ... even with a bad clock signal, I would suspect it ... ZX Spectrum rom, the DivMMC doesn't boot.
... -
DivMMC EnJOY!Coming up... [IMG]http://benophetinternet.nl/hobby/vanmezelf/DivMMC_enjoy_first_render.jpg[/IMG]
... the problem is the M1 signal from z80, and as the ... with a wrong clock signal you can always see the divmmc boot screen ... -
DivMMC EnJOY!Coming up... [IMG]http://benophetinternet.nl/hobby/vanmezelf/DivMMC_enjoy_first_render.jpg[/IMG]
... did some research on the clock signal difference and posted this in ... add a 74HC04 to the DivMMC (read the topic for more ... -
ZX Spectrum clock signals comparedI haven't searched for this on WoS; it might have been posted before. But I think it's important info, and can't do any harm to repeat or show from a…
... why I am investigating the clock signal[/U]
I'm ... DivMMC EnJOY! interface: it has some problems with the ZX Spectrum clock signal ... do you need the Spectrum clock signal? Wouldn't be a ... a softcore to regenerate the clock signal from the original because he ... -
ZX Spectrum clock signals comparedI haven't searched for this on WoS; it might have been posted before. But I think it's important info, and can't do any harm to repeat or show from a…
... the hardware spi port of divmmc (and zxmmc of course) is ... a softcore to regenerate the clock signal from the original because he ... the CPU clock, but I don't get why a DivMMC / joystick ... interface would need a clock to be ... -
ZX Spectrum clock signals comparedI haven't searched for this on WoS; it might have been posted before. But I think it's important info, and can't do any harm to repeat or show from a…
... the hardware spi port of divmmc (and zxmmc of course ... "][B]I have the DivMMC working on all ZX ... that already pulls up the clock signal from the ULA.
clock signal from the ULA.
clock signal from the ULA.
DivMMC EnJOY!Coming up... [IMG]http://benophetinternet.nl/hobby/vanmezelf/DivMMC_enjoy_first_render.jpg[/IMG]
... fix needed to enhance the clock signal on the toastrack, causes problems ... fix that will enable the DivMMC EnJOY! to work on all ... now:
1. Enhance the clock circuit once again - this will ...DivMMC EnJOY!Coming up... [IMG]http://benophetinternet.nl/hobby/vanmezelf/DivMMC_enjoy_first_render.jpg[/IMG]
... fix needed to enhance the clock signal on the toastrack, causes problems ... fix that will enable the DivMMC EnJOY! to work on all ... now:
1. Enhance the clock circuit once again - this will ...ZX Spectrum and add-on temperaturesImre Jakli from Hungary sent me some interesting pictures which I think are worth to share. These are about temperatures he measured with a modern to…
... us :lol:, because Ben's DivMMC EnJOY! is not working (yet ... to the very-very weak clock signal (1.46V)
[IMG]http ...DivMMC Enjoy! and interface 1 on ZX+Hi there, I recently obtained the DivMMC Enjoy! and I noticed that it hangs if I plug it in the Interface 1 thru-port of my ZX Spectrum Plus. Conne…
... pull-up resistor on the clock signal, needed for most toastracks which ... have a very weak clock signal.
You are the ... 48K models: he measured the clock signals with different ULA's ... into new designs of the DivMMC EnJOY!.
Switch ...DivMMC Enjoy! and interface 1 on ZX+Hi there, I recently obtained the DivMMC Enjoy! and I noticed that it hangs if I plug it in the Interface 1 thru-port of my ZX Spectrum Plus. Conne…
... . The "high level" of the clock signal is 2.88V which is ... -6 or 6C001E-7 the clock signal became "normal". It has a ... make nicer screenshots of the clock signal, so I share you the ... had problems with DivMMC EnJOY! and we suspected the clock signal problem. I ...Dot crawl?Hi, As I'm rather new to the hardware of the spectrum, just to confirm: is this video showing "Dot crawl" ? [url]https://www.youtube.com/watch?v=_U…
... 107[/URL]
SPECTRA and DivMMC EnJOY! worked together. Two of ... bad clock signal with significant DC offset (760-800mV) or the clock signal was ... too weak and DivMMC EnJOY! didn't ... like to use SPECTRA+DivMMC EnJOY! together?ZX Spectrum Clock Signal Restorer Circuit[SIZE=5][U][B]ZX Spectrum Clock Signal Restorer Circuit[/B][/U][/SIZE] The circuit below is an experimental circuit. It has only been "tested" using…
... to make an acceptable clock signal for the DivMMC EnJOY! and the ... idea to use inverters for clock signal "amplification". Originally he ... me possible to use DivMMC EnJOY! and Spectranet connected ... ISSUE2 and an ISSUE4B Spectrum (DivMMC EnJOY! + SPECTRA) and ...divMMC ENJOY wont work with 48+it works with my 48+ ver 6b with my 128+,my 128+2 128+2a 128+2b but not the ver 4 48+:confused:,the green light stays on the blue light never comes o…
... experimented a little with a clock signal amplifier circuit. These tests were ... on something I connected the DivMMC EnJOY! to the Spectrum+ ... of the Spectrum and the DivMMC EnJOY!... :( So I have ... the repair/replacement of the DivMMC EnJOY! to continue testing. ...MISSING M1 LINE ON +48????I was posting questions about my DIVMMC enjoy not working on one of my +48`s and have now got round to testing if its cpu related.Trouble is the one …
... was posting questions about my DIVMMC enjoy not working on one ... want to use which the divmmc works with is a 48 ... , or the quality of the clock signal :DDIVMMC my version512 ram, 8kb Flash ROM, esx dos, 2x thru, micro SD card slot,prototype board: [URL=http://www.fotosik.pl/showFullSize.php?id=18408198292851f7][IMG]h…
[QUOTE=schombi;801775]Aah, now that?s interesting. Is this something that can be fixed? I?m just surprised not to see this problem with a DivIDE.[/QUOTE]
DivIDE doesn't use CLOCK signal.
search Ben's DivMMC about how to fix it.DIVMMC my version512 ram, 8kb Flash ROM, esx dos, 2x thru, micro SD card slot,prototype board: [URL=http://www.fotosik.pl/showFullSize.php?id=18408198292851f7][IMG]h…
...
The fact that the clock signal available on the edge connector ... ? and ?builders? of the DIVMMC have chosen to disregard this ... ( surprise.. surprise..) that the DIVMMC didn?t work with certain ... but the enlightenment of DIVMMC users regarding a possible ...DIVMMC my version512 ram, 8kb Flash ROM, esx dos, 2x thru, micro SD card slot,prototype board: [URL=http://www.fotosik.pl/showFullSize.php?id=18408198292851f7][IMG]h…
... Spectrum and the divmmc board to buffer the clock signal, but that did ... with v 0.8.5 DivMMC, then:
Detecting Devices ...DIVMMC my version512 ram, 8kb Flash ROM, esx dos, 2x thru, micro SD card slot,prototype board: [URL=http://www.fotosik.pl/showFullSize.php?id=18408198292851f7][IMG]h…
Ben's DivMMC/EnJoy works fine ... here have stated that the clock signal may be erratic - ... to buffer input (the CLOCK signal), and it sure made ... a surprise! The Zaxon Divmmc board now works just ... Many Spectrums probably have better clock signal and not need the ...This is how a DivMMC EnJOY! comes to life![url]https://www.youtube.com/watch?v=XFjUFmS1XJE[/url]
... interoperability with other interfaces like DivMMC ENJOY! It's quite large ... with weak or DC offseted clock signal. This error occurred only in ...
