Some of my Zeddies came from a training collage. Unlikely they were only used for games.
Mark
Search found 5160 matches
- Thu May 30, 2024 11:16 pm
- Forum: Hardware
- Topic: uses for the zx80/81 outside of games
- Replies: 4
- Views: 70
- Thu May 30, 2024 3:53 pm
- Forum: Hardware
- Topic: Data 2000 case ...I think!
- Replies: 2
- Views: 2681
Re: Data 2000 case ...I think!
The photo that spinner72 was trying to post is this . Or use the provided BBcode: [url=https://ibb.co/C28XGf4][img]https://i.ibb.co/Sry1CzH/Data2000.jpg[/img][/url] Like this: https://i.ibb.co/Sry1CzH/Data2000.jpg As this is a web page and not just a picture (in a format that the forum software reco...
- Wed May 29, 2024 12:37 pm
- Forum: Welcome Area
- Topic: Greeting from the UK. Coding again for the Zx81
- Replies: 7
- Views: 263
Re: Greeting from the UK. Coding again for the Zx81
Hello and welcome to our forum RS232!
I hope you enjoy this forum
Although I notice you actually joined some time ago
And thank you for contributing
Mark
I hope you enjoy this forum
Although I notice you actually joined some time ago
And thank you for contributing
Mark
- Wed May 29, 2024 2:58 am
- Forum: Development
- Topic: Does a specy membrane work on a zx81?
- Replies: 2
- Views: 163
Re: Does a specy membrane work on a zx81?
No and yes. The keyboard matrix is the same, but the order of the signals on the membrane tails is different. Plus the location on the boards for the connectors for the tails is different. So if you use separate connectors and add your own wiring so you can change the order of the signals, yes. Mark
- Tue May 28, 2024 12:32 pm
- Forum: Hardware
- Topic: Timex Sinclair 2068 - Troubleshooting
- Replies: 2
- Views: 377
Re: Timex Sinclair 2068 - Troubleshooting
U1 (µA78S40), Q1 (D432C1), CR1 (1N5821), the inductor L2 and associated components form a buck converter (step-down DC-to-DC converter) which decreases and regulates the output voltage to a set amount. It has the limitation that often a fault with it will result in nearly the full input voltage bein...
- Tue May 28, 2024 11:44 am
- Forum: Welcome Area
- Topic: Hello everyone!
- Replies: 2
- Views: 258
Re: Hello everyone!
Hello and welcome to our forum Diegorand!
I hope you enjoy this forum
Mark
I hope you enjoy this forum
Mark
- Tue May 21, 2024 11:19 pm
- Forum: Hardware
- Topic: FIXED Spectrum +2 grey 5V and 12V power short
- Replies: 12
- Views: 778
Re: FIXED Spectrum +2 grey 5V and 12V power short
No problem
Good to know that you fixed it. Thank you also for reporting your findings
Mark
Good to know that you fixed it. Thank you also for reporting your findings
Mark
- Fri May 17, 2024 7:09 pm
- Forum: Hardware
- Topic: FIXED Spectrum +2 grey 5V and 12V power short
- Replies: 12
- Views: 778
Re: Spectrum +2 grey dead short
Oh, and the voltage source has to be a constant steady voltage, otherwise you are wasting your time.
Mark
Mark
- Fri May 17, 2024 7:02 pm
- Forum: Hardware
- Topic: FIXED Spectrum +2 grey 5V and 12V power short
- Replies: 12
- Views: 778
Re: Spectrum +2 grey dead short
Well, you could try using the voltage gradient testing to try to narrow down the area where the fault is. Every conductor (outside of superconductors) has a small resistance, including PCB tracks. Hence if there is a short circuit, there will be a gradual voltage loss (drop) between the source of th...
- Fri May 17, 2024 2:26 pm
- Forum: Hardware
- Topic: FIXED Spectrum +2 grey 5V and 12V power short
- Replies: 12
- Views: 778
Re: Spectrum +2 grey dead short
Shorts on the +5V rail are rather tricky to find, because almost everything is connected to it...
How good is your multimeter?
How many digits and what is the maximum count?
What is the lowest DC voltage range?
Mark
How good is your multimeter?
How many digits and what is the maximum count?
What is the lowest DC voltage range?
Mark