My 1000 is on its way OHIO

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Gregg Evans
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Joined: Sat Oct 07, 2017 2:04 am

My 1000 is on its way OHIO

Post 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.
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gammaray
Posts: 590
Joined: Sun Apr 17, 2016 2:44 am
Location: Texas

Re: My 1000 is on its way OHIO

Post by gammaray »

Howdy from Texas!
5-TS1000,UK ZX81<-Sheelagh, US ZX81, 2-TS1500/KDLX , 3-TS2040 printer, 2-TS2020 cassette decks, ZXPAND+AY, ZeddyNET, ZXBlast, UDG, ZX8CCB, AERCO, BUILDS/REPAIRS ZX Spectrum, ZX80 Minstrel, ZXMAX48 v1 v2, 2-TS-2068, ROM, 16kRAM
sirmorris
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Re: My 1000 is on its way OHIO

Post by sirmorris »

Welcome aboard!
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mrtinb
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Re: My 1000 is on its way OHIO

Post 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!
Martin
https://zx.rtin.be
ZX81, Lambda 8300, Commodore 64, Mac G4 Cube
Lardo Boffin
Posts: 2160
Joined: Sat Nov 26, 2016 2:42 am

Re: My 1000 is on its way OHIO

Post 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! :D
ZX80
ZX81 iss 1 (bugged ROM, kludge fix, normal, rebuilt)
TS 1000 iss 3, ZXPand AY and +, ZX8-CCB, ZX-KDLX & ChromaSCART
Tatung 81 + Wespi
TS 1500 & 2000
Spectrum 16k (iss 1 s/n 862)
Spectrum 48ks plus a DIVMMC future and SPECTRA
Gregg Evans
Posts: 10
Joined: Sat Oct 07, 2017 2:04 am

Re: My 1000 is on its way OHIO

Post 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.
Gregg Evans
Posts: 10
Joined: Sat Oct 07, 2017 2:04 am

Re: My 1000 is on its way OHIO

Post 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?
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gammaray
Posts: 590
Joined: Sun Apr 17, 2016 2:44 am
Location: Texas

Re: My 1000 is on its way OHIO

Post by gammaray »

Can you make a proper video circuit?

viewtopic.php?f=7&t=2405&p=25270&hilit= ... deo#p25270
5-TS1000,UK ZX81<-Sheelagh, US ZX81, 2-TS1500/KDLX , 3-TS2040 printer, 2-TS2020 cassette decks, ZXPAND+AY, ZeddyNET, ZXBlast, UDG, ZX8CCB, AERCO, BUILDS/REPAIRS ZX Spectrum, ZX80 Minstrel, ZXMAX48 v1 v2, 2-TS-2068, ROM, 16kRAM
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blittled
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Joined: Fri Dec 19, 2008 3:04 am
Location: Northwestern Pennsylvania, USA

Re: My 1000 is on its way OHIO

Post by blittled »

Hi from a neighbor in northwestern Pennsylvania :)
2X Timex Sinclair 1000, ZX81, ZX80Core, 5X 16K Ram Pack, ZXBlast, ZX P file to Ear Input Signal Converter, Elf II
Gregg Evans
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Joined: Sat Oct 07, 2017 2:04 am

Re: My 1000 is on its way OHIO

Post 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
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