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ZX Spectrum issue 6a - yellow border problem<p>Hello!</p><p>I have problem with my Sinclair ZX Spectrum issue 6A, 48K. </p><p>I have changed low memory (all 4116 IC's) and coil, all electrolyti…
... .I don't have an oscilloscope, but I will try to ... -
ZX Spectrum issue 6a - yellow border problem<p>Hello!</p><p>I have problem with my Sinclair ZX Spectrum issue 6A, 48K. </p><p>I have changed low memory (all 4116 IC's) and coil, all electrolyti…
... the diode.
With the oscilloscope you should check the quality ... -
ZX Spectrum issue 6a - yellow border problem<p>Hello!</p><p>I have problem with my Sinclair ZX Spectrum issue 6A, 48K. </p><p>I have changed low memory (all 4116 IC's) and coil, all electrolyti…
... OK.
With the oscilloscope check also the quality of ... -
ZX Spectrum issue 6a - yellow border problem<p>Hello!</p><p>I have problem with my Sinclair ZX Spectrum issue 6A, 48K. </p><p>I have changed low memory (all 4116 IC's) and coil, all electrolyti…
... mind that when using an oscilloscope, the logic levels for "TTL ... />
You should use a oscilloscope rated at 20MHz or higher ... -
ZX Spectrum issue 6a - yellow border problem<p>Hello!</p><p>I have problem with my Sinclair ZX Spectrum issue 6A, 48K. </p><p>I have changed low memory (all 4116 IC's) and coil, all electrolyti…
Thanks for your responses, HZJ and Mark!I will try to find an oscilloscope in next week, and when I do, I will post results here. -
ZX Spectrum issue 6a - yellow border problem<p>Hello!</p><p>I have problem with my Sinclair ZX Spectrum issue 6A, 48K. </p><p>I have changed low memory (all 4116 IC's) and coil, all electrolyti…
Hello!Pictures from oscilloscope (Z80):pin 06:
pin 16,17, 18, 20, 23, 24,25 ,26 (around 5V)
pin 19
pin 21
pin 22
pin 27
pin 28Oscilloscope - Hameg HM103Y (5V scale), X (1us scale). -
ZX Spectrum issue 6a - yellow border problem<p>Hello!</p><p>I have problem with my Sinclair ZX Spectrum issue 6A, 48K. </p><p>I have changed low memory (all 4116 IC's) and coil, all electrolyti…
... :
1) With the oscilloscope check also the quality of ... -
ZX Spectrum issue 6a - yellow border problem<p>Hello!</p><p>I have problem with my Sinclair ZX Spectrum issue 6A, 48K. </p><p>I have changed low memory (all 4116 IC's) and coil, all electrolyti…
Hello!I checked voltage on pin8 and it is:
It is around 12V on oscilloscope (10.9V when I check with multimeter) with this little peak. X-scale is 0.1ms.How to synchronise Z80 /MREQ pin (with what I need to synchronise it)? -
TV Pal, odd and even framesI have been researching, but haven't found any real interesting information on this subject, so far. What I mean is, since TV PAL signal is interl…
... to the fact that my oscilloscope didn't trigger line #1 ... -
ZX Spectrum+ adviceHey all, I just got a ZX Spectrum+ from eBay and I'm not sure yet what to do with it. I wanted to first take a peek inside, see what issue board it i…
... composite video signal is an oscilloscope.
A TV / monitor ... -
ZX Spectrum+ adviceHey all, I just got a ZX Spectrum+ from eBay and I'm not sure yet what to do with it. I wanted to first take a peek inside, see what issue board it i…
... composite video signal is an oscilloscope.[/quote]
I'll ... -
Gold Train in PolandWas listening to the radio this morning and the guy was talking about a train that has been found in Poland buried since the end of the war and possi…
... hasn't just put an oscilloscope on demo mode and taken ... -
A tally on the number of successful builds of the Harlequin[SIZE=4][COLOR=Green][U][B]A tally on the number of successful builds of the Harlequin.[/B][/U][/COLOR][/SIZE] Please post your successes below :-) …
... I could check with an oscilloscope and post the output for ... -
48k not startingHi team, I have 2 48k's, one works (Issue 4s), one doesn't (Issue 4a). The non-working one appears to start, but not finish the RAM test. The pape…
... you have access to an oscilloscope? I'm assuming you can ... -
1-Bit Sound AccuracyI'm hoping someone can give this snapshot a try on a real machine (just press enter to start the music): https://drive.google.com/file/d/0B6XhJJ33xp…
I could capture some real sound from a real 48K with a studio mic, and oscilloscope waveforms from the mic port, if it would help? -
1-Bit Sound AccuracyI'm hoping someone can give this snapshot a try on a real machine (just press enter to start the music): https://drive.google.com/file/d/0B6XhJJ33xp…
... with a studio mic, and oscilloscope waveforms from the mic port ... -
I recapped my 128K toastrack, installed stereo kit and detached audio from video, but...Hello fellow forumers! I'm seeking for help: I've finally decided to change all electrolytic capacitors of my 6U (with all Panasonics 105oC)... Af…
... you have access to an oscilloscope, it may help to 'scope ... -
I recapped my 128K toastrack, installed stereo kit and detached audio from video, but...Hello fellow forumers! I'm seeking for help: I've finally decided to change all electrolytic capacitors of my 6U (with all Panasonics 105oC)... Af…
... 't have access to an oscilloscope...
Got it about the ... -
I recapped my 128K toastrack, installed stereo kit and detached audio from video, but...Hello fellow forumers! I'm seeking for help: I've finally decided to change all electrolytic capacitors of my 6U (with all Panasonics 105oC)... Af…
... the synchron signal using an oscilloscope. Maybe a transistor is died ... -
Spectrum +2 (Grey) troubleshooting helpHi guys, first time poster here, tell me if I'm doing something wrong. I bought a ZX Spectrum 128k +2 a week ago, it was sold in working condition a…
In that case I would be inclined to mod the resistor that feeds 12V to the scart RGB blanking pin to see if that has any effect. Unless you have access to an oscilloscope? -
Sudden death of ZX Spectrum 48KHello A friend gave me a 48K rubber keyed Spectrum. I brought it home, hooked it up to my little TV and powered it up. I was very happy to see t…
... can test voltages. Alas no oscilloscope. I took the Spectrum apart ... -
Sudden death of ZX Spectrum 48KHello A friend gave me a 48K rubber keyed Spectrum. I brought it home, hooked it up to my little TV and powered it up. I was very happy to see t…
... I don't own an oscilloscope to perform more in-depth ... -
Harlequin clone...PCB manufactured!Using Chris Smith's detailed schematics and project notes from the Harlequin... a Speccy fan in the United States by the name of Don (Superfo) has de…
... electronic circuits and using an oscilloscope.
Greetings Ingo ... -
Harlequin clone...PCB manufactured!Using Chris Smith's detailed schematics and project notes from the Harlequin... a Speccy fan in the United States by the name of Don (Superfo) has de…
... electronic circuits and using an oscilloscope.
Greetings Ingo.[/quote ... -
Harlequin Rev GI have just got all the bits to build an Harlequin Rev G system and I went for a red solder mask board. I have fitted the 3 surface mount components…
... a logic probe or an oscilloscope I would ask you to ... -
Introduce yourself[SIZE=3][FONT=Comic Sans MS]This is the thread to stop by & introduce yourself.[/FONT][/SIZE]
... RAM chip (IC27) using my oscilloscope :) -
Brightness level of non-bright attributes on classic ZX 48Does anybody know what was a brightness level of non-bright attributes on classic ZX 48? Was it the same on 128, +2 and +3? I can see on wikipedia a…
... the video waveforms (using my oscilloscope) of a issue 1 board ... -
Spectrum +2 (grey): Mod- and operation- related advices needed.Dear Sirs and Ladies, Please welcome a newbie to the “World of Spectrum” (both to the forum and, well, metaphorically). I’ve recently purchased a…
... couple of meters and a oscilloscope.
Highly unlikely the ... -
ZX Spectrum 48k output yellow and jumpyI have a ZX Spectrum that I modded for composite output a few years a go. Lately they output started to be a bit jumpy during the first half hour. Th…
... you have access to an oscilloscope, it's just a matter ... -
ZX Spectrum 48k issuesHi all! A couple of days ago I bought my first 48k Speccy off ebay (I already own a beautiful QL expanded with QubIDE interface and 640k ram). It was…
... by the ULA with the oscilloscope I saw these "stops" periods ...
