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My 1000 is on its way OHIO
Posted: Sat Oct 07, 2017 2:14 am
by Gregg Evans
Hi. Ive always wanted to understand the real 1s and 0 of electrons can be moved around to look smart and I finally found a book that made sense to me. "Programing the Z-80" So one thing led to another and I ordered a 20 dollar 1000 on Ebay to mess around with. One of the classes I assist in is an electrical engineering class so I will have some support. Particularly interested in adding some inputs and out puts and burning a ROM. Perhaps create a breadboard that automatically displays the voltage on the screen for each row using a lot of multiplexers.
Re: My 1000 is on its way OHIO
Posted: Sat Oct 07, 2017 5:25 am
by gammaray
Howdy from Texas!
Re: My 1000 is on its way OHIO
Posted: Sat Oct 07, 2017 9:28 am
by sirmorris
Welcome aboard!
Re: My 1000 is on its way OHIO
Posted: Sat Oct 07, 2017 11:41 am
by mrtinb
Gregg Evans wrote: ↑Sat Oct 07, 2017 2:14 amHi. Ive always wanted to understand the real 1s and 0 of electrons can be moved around to look smart and I finally found a book that made sense to me. "Programing the Z-80"
If you want a really great book about how a cpu, ram and rom is working down to every 1 and 0 you can get the book
But How Do It Know?. This book gave me the great Aha!
Re: My 1000 is on its way OHIO
Posted: Sat Oct 07, 2017 1:26 pm
by Lardo Boffin
mrtinb wrote: ↑Sat Oct 07, 2017 11:41 am
Gregg Evans wrote: ↑Sat Oct 07, 2017 2:14 amHi. Ive always wanted to understand the real 1s and 0 of electrons can be moved around to look smart and I finally found a book that made sense to me. "Programing the Z-80"
If you want a really great book about how a cpu, ram and rom is working down to every 1 and 0 you can get the book
But How Do It Know?. This book gave me the great Aha!
I have just ordered a copy of that book!
Re: My 1000 is on its way OHIO
Posted: Tue Oct 10, 2017 3:28 am
by Gregg Evans
mrtinb wrote: ↑Sat Oct 07, 2017 11:41 am
Gregg Evans wrote: ↑Sat Oct 07, 2017 2:14 amHi. Ive always wanted to understand the real 1s and 0 of electrons can be moved around to look smart and I finally found a book that made sense to me. "Programing the Z-80"
If you want a really great book about how a cpu, ram and rom is working down to every 1 and 0 you can get the book
But How Do It Know?. This book gave me the great Aha!
Thanks for the lead. Google play has a decent size sample of this book so I am going to really check it out.
Re: My 1000 is on its way OHIO
Posted: Mon Oct 16, 2017 8:57 pm
by Gregg Evans
So Bummer, my 1000 arrived and it is not putting out a video signal ( at least I think.) I didn't have a TV so I bypassed the modulator by soldering to the USA line into the modulator and to the ground. then connected it to a tested composite B&W monitor. I tested the power supply and the little doodad that converts it to 5V. they both work (I know the keyboard is completely disconnected but that should be easy.)
I'm sure this comes up all the time but could some one please direct me to a thread about systematic testing of the computer?
Re: My 1000 is on its way OHIO
Posted: Tue Oct 17, 2017 10:27 pm
by gammaray
Re: My 1000 is on its way OHIO
Posted: Wed Oct 18, 2017 2:21 pm
by blittled
Hi from a neighbor in northwestern Pennsylvania
Re: My 1000 is on its way OHIO
Posted: Wed Oct 18, 2017 9:32 pm
by Gregg Evans
Yes I can make that. I made a little progress today. There seems to be 2 labels on the board that say USA before it goes to the modulator One was kind of hiding. So I tried that line out (the one farthest to the left) because the oscilloscope showed a more convincing pattern. When I went from that line I got no text but I did get very thin black and white vertical lines. I will try this video circuit you linked to if there is a chance it will fix it. Thanks