My 1000 is on its way OHIO

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Gregg Evans
Posts: 10
Joined: Sat Oct 07, 2017 1:04 am

My 1000 is on its way OHIO

Post by Gregg Evans » Sat Oct 07, 2017 1:14 am

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: 258
Joined: Sun Apr 17, 2016 1:44 am
Location: Texas

Re: My 1000 is on its way OHIO

Post by gammaray » Sat Oct 07, 2017 4:25 am

Howdy from Texas!
Finish what you start. Truth is over the mountaintop or six feet under.
4 x TS1000, 2 x TS1500 , 2 x timex 2040 printer, 1/2 x timex 2020 cassette deck, ZXPAND, ZeddyNET, ZXBlast..., unfinished Spectrum...Still no life!

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sirmorris
Posts: 2669
Joined: Thu May 08, 2008 4:45 pm
Location: oxon, uk

Re: My 1000 is on its way OHIO

Post by sirmorris » Sat Oct 07, 2017 8:28 am

Welcome aboard!
--=== ZXpand+ ... A more moderner all-in-one upgrade solution for ZX81 ===--
* SD/MMC storage * 32K Hires-capable RAM * AY sound chip * Joystick port * Serial *
* BASIC enhancements - plug & play * Reset button * Auto-boot facility *

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mrtinb
Posts: 508
Joined: Fri Nov 06, 2015 4:44 pm
Location: Denmark
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Re: My 1000 is on its way OHIO

Post by mrtinb » Sat Oct 07, 2017 10:41 am

Gregg Evans wrote:
Sat Oct 07, 2017 1:14 am
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"
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
ZX81, Lambda 8300, Commodore 64, Mac G4 Cube

Lardo Boffin
Posts: 626
Joined: Sat Nov 26, 2016 1:42 am

Re: My 1000 is on its way OHIO

Post by Lardo Boffin » Sat Oct 07, 2017 12:26 pm

mrtinb wrote:
Sat Oct 07, 2017 10:41 am
Gregg Evans wrote:
Sat Oct 07, 2017 1:14 am
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"
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
ZX81 iss 1 (bugged ROM, kludge fix, normal, kit)
Iss 3 with ZXVid, another in nearly perfect box
TS 1000 iss 3, ZXPand AY, ZX8-CCB & ZX-KDLX
TS 1500
TS 2000
Spectrum 16k (iss 1 s/n 1499)
Spectrum 48k
Toastrack + DIVMMC future

Gregg Evans
Posts: 10
Joined: Sat Oct 07, 2017 1:04 am

Re: My 1000 is on its way OHIO

Post by Gregg Evans » Tue Oct 10, 2017 2:28 am

mrtinb wrote:
Sat Oct 07, 2017 10:41 am
Gregg Evans wrote:
Sat Oct 07, 2017 1:14 am
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"
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 1:04 am

Re: My 1000 is on its way OHIO

Post by Gregg Evans » Mon Oct 16, 2017 7:57 pm

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: 258
Joined: Sun Apr 17, 2016 1:44 am
Location: Texas

Re: My 1000 is on its way OHIO

Post by gammaray » Tue Oct 17, 2017 9:27 pm

Can you make a proper video circuit?

viewtopic.php?f=7&t=2405&p=25270&hilit= ... deo#p25270
Finish what you start. Truth is over the mountaintop or six feet under.
4 x TS1000, 2 x TS1500 , 2 x timex 2040 printer, 1/2 x timex 2020 cassette deck, ZXPAND, ZeddyNET, ZXBlast..., unfinished Spectrum...Still no life!

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blittled
Posts: 162
Joined: Fri Dec 19, 2008 2:04 am
Location: Northwestern Pennsylvania, USA

Re: My 1000 is on its way OHIO

Post by blittled » Wed Oct 18, 2017 1:21 pm

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
Posts: 10
Joined: Sat Oct 07, 2017 1:04 am

Re: My 1000 is on its way OHIO

Post by Gregg Evans » Wed Oct 18, 2017 8:32 pm

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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