Sinclair ZX80 / ZX81 / Z88 Forums

Hello, and thanks for the response! That helped me to understand how the Speccy's jack works. I found a cable like what you sent (that 1 stereo to 2 mono converter). But other than that, I made a DIY mono AUX cable(sorry, but I don't have picture from) by connecting the Right line(middle part of th...

Hello everyone! I need some help fixing the recording on my Spectrum+. So, when I tried to record my program onto the voice recorder on my phone(with a stereo jack to microphone adapter) there is only noise. I tried to listen closely to these recordings but I didn't heard anything "usable"(the mach...

Hello! So, i have made a lot of things. First up, I measured the legs of the Z80 with my multimeter. Everything has worked, EXCEPT FOR THE PIN "M1". I was sure, the CPU is bad. So, the new challenge: find a working Z80. Well, after a little search I have found a Z84C0008PEG. I desoldered the old CPU...

Hello!

https://www.ebay.com/itm/164801016320?h ... SwSddgbVrT

So, here is another z80. I will continue looking for a good cpu. I am in Hungary. Unfortunately, i didn't find a NEC D780C-1 cpu. i will tell you the result of testing the z80.

So, I found another z80(which is a cpu, I think...)

https://www.ebay.com/itm/162783576670?h ... SwzppaHRzF

R.I.P. Mr. Clive.

Hello! I found a z80 from China on eBay.

https://www.ebay.com/itm/311081981813?h ... Sw7K1ep1kr

Its a DIP40 z80a. So, what did you think? Should I buy it? I don't want to cut the legs of my z80a before I didn't get another. This is good for the Spectrum?

Thanks,

Gábor

Sorry for no anwser... I have a lot of school work. So I have a friend who can has an oscilloscope or maybe he can have a logic probe. If he have one I will let you know about! The Z80 what I previously found is not available anymore... :( I will search for an other one and I will buy a socket for t...

One interesting thing:

When I power up the Spectrum, the black bars appears but I need to wait about 2 seconds till the colors appears.
Is it normal?

I found a 20mhz logic probe on a webshop. I need to buy it, or can I have another way to find the problem?

"Do you have any of those test connection clips that can be clipped on to component legs/leads/pins?" Do you think for this? (last picture) "And can you solder?" Yes, I can(actually nicely ;) ) "Do you have, or have access to a logic probe?" No, unfortunately I don't. It is the same problem, after I...