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Black Screen Spectrum 48kWas working ok, it came to me in a Fuller FDS keyboard, I had a nose inside and found a floating power lead connected to the keyboard, I removed that…
... (all test ok) as per Zorn's video and am currently replacing ... another working ULA and it's not that...
Update ... -
ZX81 internal RAM board?Just a quick question to Zorn (amongst others). What would the issues be with fitting one of Zorn's RAM boards into an unexpanded ZX81? Seems to me…
Just a quick question to Zorn (amongst others).
What ... be with fitting one of Zorn's RAM boards into an unexpanded ... of the official RAM pack's internal circuitry is to generate ... 4116 chips.
Since Zorn's board only needs 5 volts ... -
Memory testersHi, Just wondering which software people are using to test the memory in their spectrum. I have been using Zorn's memory tester as described here:…
... spectrum. I have been using Zorn's memory tester as described here ... -a-48k#latest
(Zorn's hosting has since disappeared, but ... -
Grey +2 SRAM module - any interest ?In the same vein as Zorn's RAM replacement modules, I designed a board that replaces a bank of 8x4164 RAM IC's as used in the Grey +2 with a modern S…
In the same vein as Zorn's RAM replacement modules, I designed ... bank of 8x4164 RAM IC's as used in the Grey ... />
I realise that 4164's are still fairly easy to ... load of seperate IC's.
Here's a picture of ... -
How the DC-DC converter worksI've not seen this before. The DCC-DC converter inside the Speccy has always been quite a mistery for me: [url]http://www.tablix.org/~avian/blog/arch…
Thanks Ingo, I must bow for the master. Your explanation makes Zorn's observations about different wavepatterns most likely. -
Diagnosing a strange software fault in a 48kHi, A friend gave me a 48k, which I am very keen to restore. The spectrum 48k was my first computer over 20 years ago and I owe my ability to code t…
Ah ha! Zorn you legend!
[ ... work like that? I mean, Zorn's program was not poking 85 ... -
Diagnosing a strange software fault in a 48kHi, A friend gave me a 48k, which I am very keen to restore. The spectrum 48k was my first computer over 20 years ago and I owe my ability to code t…
... . With the new ram chip, Zorn's memory checker gives no errors ... -
Tape loading from PCSo, I found that I had been using the wrong audio jack socket on my 48k for tape loading (my spectrum is in a third party case, so there are not labe…
Thanks for everyone's advice so far.
... have built the cable to Zorn's specifications, but that alone is ... -
Which ULA?Just a quick question, more of interest rather than immediate need... I am thinking ahead about the repair of an Issue 2 board, and also an Issue 6A …
... investing in a stack of Zorn's replacement Lower RAM boards in ... -
16K/48K Lower RAM (4116) replacement.You may want to read [URL="http://www.worldofspectrum.org/forums/showthread.php?t=37957"]this thread[/URL] for background information on the quest t…
Bought one of these from Zorn's eBay shop; it arrived this weekend. Nice piece of kit! :) Will be using it to help diagnose my poorly 16k Speccy later this week! -
Poorly Issue One 16k spectrum diagnosis?Hello, everyone. :smile: I was lucky enough to buy an Issue One 16k rubber key the other week; I didn't know it was an Issue One till I opened it up…
... for the late update - it's been crazy at work this ... of the 4116 chips for Zorn's excellent lower ram replacement module ... -cosmetically-matching one, but that's not so much of an ... -
Poorly Issue One 16k spectrum diagnosis?Hello, everyone. :smile: I was lucky enough to buy an Issue One 16k rubber key the other week; I didn't know it was an Issue One till I opened it up…
... />
So... I have replaced Zorn's module with some 4116s and ... -
ZX Spectrum 48K working as 16K from factoryGood morning I Have a Zx Spectrum 48k working as 16K , it came like this from factory. What can i do to solve this , and put it to work as 48K? Wha…
Maybe it's just my perception, but IC19 ( ... the rest - suggesting that it's been replaced in the past ... .
The tests that Zorn's provided will hopefully be able ... -
Poorly Issue One 16k spectrum diagnosis?Hello, everyone. :smile: I was lucky enough to buy an Issue One 16k rubber key the other week; I didn't know it was an Issue One till I opened it up…
... point I'd be putting Zorn's replacement 4116 module back in ... properly.
If it's stable with the lower RAM ... 'd find some new 4116's to pop in as replacements ... -
Poorly Issue One 16k spectrum diagnosis?Hello, everyone. :smile: I was lucky enough to buy an Issue One 16k rubber key the other week; I didn't know it was an Issue One till I opened it up…
... wasn't a stripe with Zorn's module in place. I have ... -
First time capacitor replacementHi, I have an Issue 2 board, that i wish to start with recapping as advised on here, as they look to be all original. (Same with V3 board, but going…
... one or more DRAM chip(s). But only change on failure ... I am fitting one of Zorn's SRAM modules).
Good ... -
One more grey +2 with video problemsI guess I need your help again to hopefully be able to do some proper troubleshooting myself one day. Here I have a grey +2, which could be a bottom…
... the coil as shown in Zorn?s 48K video. The outer positions ... .php5?title=Replacement_Components[/URL]), there?s only the 48K and the ... -
My first composite mod.Thought it was about time I gave the composite mod a go. I used a youtube video, the bloke in the video took 10 mins, I took about 2 hours :) but it…
... a number of modifications, including Zorn's lower and upper RAM module ... -
My first composite mod.Thought it was about time I gave the composite mod a go. I used a youtube video, the bloke in the video took 10 mins, I took about 2 hours :) but it…
... a number of modifications, including Zorn's lower and upper RAM module ... was issue 5, but it's just a little bit of ... -
Born again Speccy user with problemsHello all, Firstly I'd like to say a big hello - this is my first post! When I was 8 or 9 or so my dad bought a ZX Spectrum 48K and a whole bunch o…
... the speccy!
Here's a shot of me loading ... composite mod while waiting for Zorn's new memory modules to arrive ... -
48k Missing D15Got a 48k here that is missing D15 (just below right molex connector), someone removed it in the past, only just noticed it was gone after replacing …
Yes - it's missing the power converter mod ... all resistances in accordance with Zorn's video on the subject. If ... -
48k Missing D15Got a 48k here that is missing D15 (just below right molex connector), someone removed it in the past, only just noticed it was gone after replacing …
Ok, so here's what I'd do at ...
- replace TR4
- Do Zorn's resistance check, if this fails ... coil
- Start removing 4116's until the resistance checks pass ... -
Cooler padI have this cooler pad that prevents an old laptop from getting overheated like hell. It is powered by plugging it to the usb port. I don't have a sp…
... lower and upper RAM with Zorn's memory modules
- Replaced all ... -
Grey +2 DiedHi all, Thrashing my +2 playing Mugsy last night and it did this... [URL="https://m.flickr.com/photos/83515822@N05/13012551693/lightbox/"]https://m…
... .youtube.com/watch?v=IzgCmldm2H4"]Zorn's resistance checks[/URL] first, then ... / layout and replace RAM IC's as needed;
[*]If no ... results are obvious, then it's out with the oscilloscope. At ... is a basic list, and Zorn / 1024MAK / DEATH are by far ... -
Another "untested" dead spectrum...Hi, I'm looking for some suggestions on a faulty Spectrum I have picked up. I'll need to wait until tomorrow before posting pics, but the screen is …
... lower.
Go with Zorn's advice, lower RAM is suspect ... -
Poorly Issue One 16k spectrum diagnosis?Hello, everyone. :smile: I was lucky enough to buy an Issue One 16k rubber key the other week; I didn't know it was an Issue One till I opened it up…
... a crack at fixing - it's currently sitting on the tinkering ... . Notes: replacing the 4116 with Zorn's awesome RAM replacement module works ... regulator gets hot, but that's normal I think. Coils buzz ... -
Poorly Issue One 16k spectrum diagnosis?Hello, everyone. :smile: I was lucky enough to buy an Issue One 16k rubber key the other week; I didn't know it was an Issue One till I opened it up…
... using Zorn's RAM replacement module works, but using different 4116's still ... fault with the socket that Zorn's RAM replacement module also uses ... -
Poorly Issue One 16k spectrum diagnosis?Hello, everyone. :smile: I was lucky enough to buy an Issue One 16k rubber key the other week; I didn't know it was an Issue One till I opened it up…
... the modern CMOS chips on Zorn's memory module, but is unable ... -
Poorly Issue One 16k spectrum diagnosis?Hello, everyone. :smile: I was lucky enough to buy an Issue One 16k rubber key the other week; I didn't know it was an Issue One till I opened it up…
... problem seems to be resolved. Zorn's RAM module still doesn't ... .
Now, though.... IT'S HARLEQUIN ASSEMBLING TIME! YEAH! :D -
Poorly Issue One 16k spectrum diagnosis?Hello, everyone. :smile: I was lucky enough to buy an Issue One 16k rubber key the other week; I didn't know it was an Issue One till I opened it up…
... beep to the speaker. It's almost a constant noise, but ... keypresses.
2. (With Zorn's module installed): Speccy works fine ... .
So... I think Zorn mentioned that symptom (2.) appears ... 32k yet.
It's almost as though this Issue ...