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Issue 3B problemHi! I have an issue 3B board that is having a strange problem: when I got it it didn't had the -5V and +12v, as usual. After replacing TR4 and TR5 t…
... capacitors and transistors and change TR1,TR2, C65 and C25. According ... -
issue 4s for reapirHi All, This time I have issue 4s for repair :) Here is few screen shots and small movie after boot. [url]http://forest.no-ip.org/issue4s/[/url] I kn…
... more critical ( I change old ZTX650 with news ZTX651 but, in ... -
issue 4s for reapirHi All, This time I have issue 4s for repair :) Here is few screen shots and small movie after boot. [url]http://forest.no-ip.org/issue4s/[/url] I kn…
... /> tr7 = d471a (y-3d6)
tr1 = C945 (y-3d5)
tr2 ... -
ZXPROJECT update: a replacement for TEA2000Just go to [url]http://www.zxprojects.com[/url]
... have to bypass TR2 and TR1 and connect directly from the ... -
Spectrum dead: 8 vertical bars in alternating colorsI have been soldering on this basterd for a long time now. All IC's now have sockets (except the LM1889). I swapped all 4116's by types that are 100%…
... far I have not replaced TR1, TR2, TR8 and TR9 (but ... -
Trouble with Spectrum 48kI think it is a Rev 3 (Issue 3 on the motherboard). The screen has weird characters, instead of text, and the keyboard is not responding (although it…
Ok, I changed the ZTX650 for a ZTX651, restoring the - ... -
I bought my first ZX Spectrum 48k, now what ?Hi guys ! I recently go to Brussel in Belgium and found a ZX Spectrum at a "flea market" (sorry, I don't the correct word for that, let's call it a …
... 's composite output is via TR1/2 which form an [URL ... -
OptimisationI've participated in several thread hijacks about this, so perhaps I should open a new thread. Et VIOLA! Here it is! Knuth, who was earlier reporte…
... a hash_map.[/quote]
TR1 is available on all the ... -
Spectrum 128+ (No TV picture)I got a Spectrum 128+ which is not generating any picture. I checked the TEA2000, and it gets not 12 Volt, but only 1.4, so this is the problem, I gu…
... .base 2.colletor 3.emitter. ZTX650/651 is 1.Collector 2 ... -
Someone can help me to fix my Zx Spectrum?I did a video about the startup: [url]http://dl.dropbox.com/u/1566495/ZXSPECTRUM03.mp4[/url] I have replaced the ULA with a working one (same proble…
... . A common fault is TR4 (ZTX650) - this poor thing has to ... you can't find a ZTX650; ZTX651's are widely available ... -
Broken or upgraded ZX Spectrum 48kHello First i want to say hello to everybody. I have a new ZX Spectrum 48k in my collection. Seller said that it is broken (no picture). I have this…
... is wrong with video circuit? TR1 or TR2?
Can you ... -
Broken or upgraded ZX Spectrum 48kHello First i want to say hello to everybody. I have a new ZX Spectrum 48k in my collection. Seller said that it is broken (no picture). I have this…
... is wrong with video circuit? TR1 or TR2?[/QUOTE]
Possibly ... -
Broken or upgraded ZX Spectrum 48kHello First i want to say hello to everybody. I have a new ZX Spectrum 48k in my collection. Seller said that it is broken (no picture). I have this…
... I plan to replace LM1889N, TR1 and TR2 (I will get ... -
Challenging the orthodoxy - Composite modWell, what's brought this on is two things: firstly I composite-modded an Issue 4S board this weekend in preparation for the Vintage Computing Festiv…
... 's composite output is via TR1/2 which form an [URL ... -
I am currently playing......Don't know if there's been a thread like this, but I can't find one.... Having seen all the different threads asking people if they've played such a…
... . The story ties in with TR1 (also anniversary) and TR:L ... -
How to make a comp video cable for +2 greySorry to bog, maybe the clue is just laiden on another thread but.... I have just obtained a 128 +2 grey, fully working BUT the aerial signal is bad…
... it instead to emitter of TR1 (BC239 - that transistor direct before ... -
Broken ZX Spectrum? :(Hi! I bought a 2nd hand ZX Spectrum half a year ago. It worked perfectly fine when I first tried it. I put it back in its box which it was sent in, …
Yes i have, but when i asked them about transistors ztx650 (or 651) and ztx213, they didn't have them. I know there is some other transistors which are exactly same as mention above, but i decided to buy them Ebay. -
ZX Spectrum + Issue 6A Repair attemptHello everybody! I got ZX Spectrum + which doesnt work properly. On power up I can see color mosaic, then paper goes black and i can see thin red ba…
... used BD136 as replacement for ZTX650, didn't notice it gets ... -
Worst gaming decisions ever?In a different thread, I mention what, to me, is probably the single greatest mistake in the history of computer/console games design ever. Here are …
... and I hated it. In TR1 there were strategically positioned crystals ... -
Worst gaming decisions ever?In a different thread, I mention what, to me, is probably the single greatest mistake in the history of computer/console games design ever. Here are …
... and I hated it. In TR1 there were strategically positioned crystals ... -
Worst gaming decisions ever?In a different thread, I mention what, to me, is probably the single greatest mistake in the history of computer/console games design ever. Here are …
... and I hated it. In TR1 there were strategically positioned crystals ... -
48k Rubber Keys + Bits and BobsNow my pristine 128k has gone, I'm selling all the other bits and bobs left over. As this is a dedicated Speccy site, you lot get first dibs, anyth…
... , it was clearly a faulty ZTX650. Put a working one and ... -
Strange device, TR1?Browsing through ebay I came across someone selling a [URL="http://cgi.ebay.co.uk/1982-ZX-spectrum-tape-machine-docking-station-games-/280599485408?p…
There's a photo of the TR1 over at [URL="http://home.freeuk.com/joro/zx80/zx80.html"]another ZX80 archive[/URL] -
Strange device, TR1?Browsing through ebay I came across someone selling a [URL="http://cgi.ebay.co.uk/1982-ZX-spectrum-tape-machine-docking-station-games-/280599485408?p…
... could be a simple transformer (TR1) transforming the low output impedance ... -
Rubber Key ZX Spectrum - White ScreenA customer has just telephoned me about a rubber key 48K ZX Spectrum which he has purchased second hand. It produces just a white screen on the tele…
... part near there being shorted. (TR1 and TR2 on the issue ... -
Picture interference on red areas.I recently got a 48K Speccy off eBay, did a composite mode and it seemed to work OK, but then my TV had to go off for repair so I didn't use it for a…
... in place of the old ZTX650 is a 3W (not 2W ... different leg order to the ZTX650. I found it easiest to ... -
Fuzzy Screen On 48k Spectrum.Hi there. I bought a Spectrum off eBay last week (another for my collection lol), and it suffers with a fuzzy screen e.g. it looks like interference …
... wish I could be replacing ZTX650 in every speccy board too ... -
Opus composite video and joystick portIve had it apart and had a good look around and cant for the life of me see whats wrong, if the joystick is selected in a game(kempston) the characte…
... first. This is done with TR1 and TR2 in the video ... -
Amperage drastic reduction in a rubber 48KWell, I am now with the approach of a drastic reduction ZXSpectrum amperage. As a first step would change the Z80 processor for other (Z80C). Unfortu…
... even changing the transistor TR4 ztx650 by ztx651 (2A) we have ... -
Amperage drastic reduction in a rubber 48KWell, I am now with the approach of a drastic reduction ZXSpectrum amperage. As a first step would change the Z80 processor for other (Z80C). Unfortu…
... even changing the transistor TR4 ztx650 by ztx651 (2A) we have ...
