I'm in the same situation with my ZX81 at the moment: white screen with no cursor.
Which finally was the damaged part in your case, the ULA or the Z80 ? I think that do you replaced one of them, tested the ZX81 and replaced the other one later it isn't?
Search found 38 matches
- Mon May 06, 2019 3:00 pm
- Forum: Hardware
- Topic: Faulty ZX81 logic probe results
- Replies: 11
- Views: 5727
- Sat May 04, 2019 8:54 pm
- Forum: Welcome Area
- Topic: Newbie from Barcelona
- Replies: 4
- Views: 3995
- Thu May 02, 2019 8:33 am
- Forum: Hardware
- Topic: White screen and no cursor at all
- Replies: 38
- Views: 14538
Re: White screen and no cursor at all
You have eliminated the RAM ??? No, both straps are open (LK1/2)… and we had to put a 16k ram pack to test the ram >>> rom boot. I soldered a jumper to connect LK2 but as it is under the green circuit in the picture is not possible to see it, but it is. I'll try to find a logic probe until the tran...
- Wed May 01, 2019 7:52 pm
- Forum: Hardware
- Topic: White screen and no cursor at all
- Replies: 38
- Views: 14538
Re: White screen and no cursor at all
Thank you for the information, it looks great!mrtinb wrote: ↑Wed May 01, 2019 7:28 pm A digital probe will help you find the problem if you don’t have an oscilloscope. Or even a voltmeter can help.
Andy from this forum has created a cheap ULA replacement.
https://www.sellmyretro.com/offer/details/32319
Hope he makes more soon.
- Wed May 01, 2019 7:17 pm
- Forum: Hardware
- Topic: White screen and no cursor at all
- Replies: 38
- Views: 14538
White screen and no cursor at all
Hello, Recently I purchased a damaged ZX81 and now I'm trying to repair it. The main problem (and the only one I hope) is that when the ZX81 is turned on I get a white screen but without cursor. The basic checks that I have done at the moment are: 1) PSU: Voltage is correct, around 14 volts without ...
- Wed May 01, 2019 6:32 pm
- Forum: Hardware
- Topic: ZX81 - White Screen No Cursor
- Replies: 22
- Views: 8654
Re: ZX81 - White Screen No Cursor
Hi Papalapa I hope some of the information in this thread is useful to you. The members here are happy to help you if they can. I do suggest though that if you want advice and help with your machine, that you start a new thread. This saves any confusion with members getting confused between the pro...
- Wed May 01, 2019 5:53 pm
- Forum: Hardware
- Topic: ZX81 - White Screen No Cursor
- Replies: 22
- Views: 8654
Re: ZX81 - White Screen No Cursor
I have the same problem than you on my ZX81: white screen with no cursor.
Did you finally solved the problem with your ZX81?
Did you finally solved the problem with your ZX81?
- Wed May 01, 2019 5:19 pm
- Forum: Welcome Area
- Topic: Newbie from Barcelona
- Replies: 4
- Views: 3995
Newbie from Barcelona
Hi there,
I'm glad to join this forum, I recently purchased an ZX81 that was my first home computer when I was young. Actually I'm doing some hardware modifications and that's why I come here to read and learn about.
Greetings from Catalonia!
I'm glad to join this forum, I recently purchased an ZX81 that was my first home computer when I was young. Actually I'm doing some hardware modifications and that's why I come here to read and learn about.
Greetings from Catalonia!