[QUOTE=schombi;801769]I tried a 32 GB Sandisk uSD card. The same jumper setting that works fine on the Harlequin does not work at all on the 48K.[/QUOTE]

Clock signal on Harlequin is much better than on original spectrum.

[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.

... />
The fact that the clock signal available on the edge connector ... Poppi needed to add a clock amplifier to his original ZXMMC ...

... divmmc board to buffer the clock signal, but that did not make ...

Do you have a spare Z80 to test with, sometimes not only the clock signal is borderline.

There was a comment on the German forum that more than likely the issue is caused by the clock signal. On Spectrum 48/128K the level is simply too low for some interfaces. The latest Harlequin revision and the grey +2 offer a much better signal.

... here have stated that the clock signal may be erratic - I hooked ... resistor to buffer input (the CLOCK signal), and it sure made a ... /> Many Spectrums probably have better clock signal and not need the extra ...

... with weak or DC offseted clock signal. This error occurred only in ...

... not to be running (no clock signal from CPUCLK on the ULA ... C52. This removed, the CPU clock looked more sane, but still ... (luminance - the B&W signal) was again shorted to ground ...

Clock signal generator, based on a quartz X1, should generate a signal having a ... frequency 35.4690MHz. This signal controls the ULA (IC1, pin ... and the shape of the signal. The frequency of the video ...

... Z80 does not have a clock signal, it will do nothing and ...

... the ULA has the CPU clock stopped, the CPU cycle is ... screen data fetch, and the clock signal to the CPU is restored ...

... fine (TR3 functions as a clock signal amplifier, and TR6 corrects an ...

... provides the CPU with its clock input, I guess you'd ... fried. Or, perhaps input a clock signal straight in to the Z80 ...

... ULA that provide a clock signal to the CPU would ... problem, as a 7MHz signal already exists). But all ... you could switch the clock signal to the Z80 CPU, ... stopped the clock, or added extra wait ... the CPU clock signal (in fact, ALL the signal timing), it ...

... dead, the CPU has no clock signal from the ULA (via the ... that you have a good clock signal on the CPU (pin 6 ...

... dead, the CPU has no clock signal from the ULA (via the ...

... set.

Remember the clock signal won't be perfectly square ...

I wonder if that was an issue 1 board without the modification to the clock signal?

... is used for generating the clock signal for the FDC, and used ... their digital specs, getting such clock generator starting reliably is a ...

... don't worry about the clock signal. First 5V TTL does not ... signals, and second, the Z80 clock signal is not a TTL spec ... signal.

Good luck:-)
< ...

... different CPUs at the same clock speed, without considering how those ... clock signals are used inside the ... the Z80 divides the external clock signal down to provide a "state ...

What is the CPU clock signal (on pin 5) like?
And also the CPU /WAIT signal? It should be high.

[b][i]Mark[/i][/b]

... speed is the maximum recommended clock frequency. The CPU will actually ... at the speed of the clock signal that feeds it. So for ...

... ASIC takes a 35.4MHz clock signal, and not the 17.7MHz ... (4FSC) clock that the 40056 ULA does ... run from a FSC clock - the same clock that the TEA2000 uses ...

... : Z80 product specification indicates that clock signal [i]should[/i] be like ...

... : Z80 product specification indicates that clock signal [i]should[/i] be like ...

... PCB issue 2 with the clock signal inversion.

Is there ...

... analyzer to monitor the Z80 clock pin (pin 6) and the ... control buses.

The clock should be 3.5 MHz ... the normal functioning of the clock signal to it.

If ... a minimum of three full clock cycles before the reset operation ...

... ie the sync clock. So we have a clock signal.

Audio ...