Search found 18 matches
- Mon May 24, 2021 1:36 pm
- Forum: Hardware
- Topic: Sometimes Screen lifts up when pressing keys
- Replies: 6
- Views: 2210
- Sun May 23, 2021 9:48 pm
- Forum: Hardware
- Topic: Sometimes Screen lifts up when pressing keys
- Replies: 6
- Views: 2210
Re: Sometimes Screen lifts up when pressing keys
No expansion, same problem on several Zx81, can be the Philips Monitor?
- Sun May 23, 2021 8:12 pm
- Forum: Hardware
- Topic: Sometimes Screen lifts up when pressing keys
- Replies: 6
- Views: 2210
Sometimes Screen lifts up when pressing keys
Hi all. This is a problem I’ve got with several Zx81 of mine. If a press some keys, sometime the screen ‘lifts up’ showing this horizontal black line. If i reposition slightly the video cable the problem temporary goes off and then goes back. This happens either with composite mod, either without. I...
- Tue Nov 17, 2020 12:34 am
- Forum: Hardware
- Topic: Trying to make a 32K mod on Zx81 together with other mods
- Replies: 4
- Views: 2166
Trying to make a 32K mod on Zx81 together with other mods
Hi all! In the past I've already made some mods to Z81s and this time I've tried to make also a 32k internal mod version, but with no luck: I've got a white screen. I've attach the pics hoping you can help me somehow. The composite mod and the Vla81 work very well and I've tried this rom adapter on ...
- Sat Jul 11, 2020 10:51 pm
- Forum: Hardware
- Topic: ZX81 ROM burning
- Replies: 6
- Views: 2848
Re: ZX81 ROM burning
Thanks!
I’ll read the post and I’ll make the wiring. However, because I’ve ordered several adaptors, do you think they’ll work with Zx81 without modifications?
Thanks!
I’ll read the post and I’ll make the wiring. However, because I’ve ordered several adaptors, do you think they’ll work with Zx81 without modifications?
Thanks!
- Sat Jul 11, 2020 10:14 pm
- Forum: Hardware
- Topic: ZX81 ROM burning
- Replies: 6
- Views: 2848
Re: ZX81 ROM burning
Thanks Mark!
And what about a 2364 a 2764 EPROM adapter using 2764 for burning Rom (I have many 2764 ROM).
And what about a 2364 a 2764 EPROM adapter using 2764 for burning Rom (I have many 2764 ROM).
- Sat Jul 11, 2020 9:39 pm
- Forum: Hardware
- Topic: ZX81 ROM burning
- Replies: 6
- Views: 2848
ZX81 ROM burning
Hi all! I've bought a TL866II Plus Eprom programmer (https://it.aliexpress.com/item/32992209964.html?spm=a2g0s.9042311.0.0.4ade4c4d2HKIbP). What kind of Eprom I need to burn Zx81 Rom? Do I need an adapter? And what about a Rom Switcher? There is an open source project? What Eprom I have to buy to ho...
- Sat Jul 28, 2018 10:46 am
- Forum: Hardware
- Topic: Bought untested ZX81 and got a black screen with a working cursor
- Replies: 3
- Views: 2726
Re: Bought untested ZX81 and got a black screen with a working cursor
I don't have it, but I've bought a ULA - I think is the culprit - and when I'll get it I'll update the thread!
- Fri Jul 27, 2018 1:56 am
- Forum: Hardware
- Topic: Bought untested ZX81 and got a black screen with a working cursor
- Replies: 3
- Views: 2726
Bought untested ZX81 and got a black screen with a working cursor
Hi! As from the title, I’ve got an untested ZX81 at an ebay auction and I get this boot up screen? What can be the culprit? In the next days I’ll be able to measure with an oscilloscope the ICs, ma my thanks in advance! http://www.terredainventare.it/img/zx81a.jpeg http://www.terredainventare.it/img...
- Tue Jul 04, 2017 5:59 pm
- Forum: Hardware
- Topic: Zx Spectrum 48k vertical black lines on boot problem
- Replies: 20
- Views: 13904
Re: Zx Spectrum 48k vertical black lines on boot problem
Thanks for your useful explanation! Unfortunately now the Nebulas are out of stock... I haven't been on their site yet. Maybe they speak about emulation because the true schematic is unknown and they Mimik the original behaviour cycle perfect. I wouldn't speak about emulation but about reverse engin...