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zx spectrum 48k interference during first two minutes of warm upi have a issue 3B 48k that i am looking at during the first two minutes (approx.) of warm up there is interference on the screen (tried to take a pic…
... issue 3B 48k that i am looking at during the first two ... -
Portugese SpectrumI've just acquired a Speccy 48K which states "made in Portugal" on the back. I thought Portugese "Spectrums" were actually some illegal copy of a Tim…
... />
[quote=piters]You mean Issue 6 of 48K Speccy? Can ... home today. And they were issue [B]6A[/B], IIRC, ... the coil... In my two models, the DC-DC converter oscillator is replaced ... 3 Outputs[/B] (two RCA connectors) and [B]Two Sinclair Joystick connectors ... -
Audio input on a +2would it be possible to connect an external tape recorder to the socket at the back,or would something bad happen?
... be there to block any DC component (essentially, attenuate any ... resistor). This would block any DC component and attenuate any transients ... port - the difference between the two is really just the filter ... resistor.
On the issue of +2 fried ULAs, the ... -
Interface 1 electrolytic capacitorsInterface 1 has three 47μF electrolytic capacitors. Is it necesary to replace them with fresh ones? I always do this with old speccys but is it…
... ...:D).
Not only the DC-DC converter capacitors, i replace all ... br /> Other times, changing the two transistors (tr1, tr2 i think ... , those two just below the modulator) made ... because of quality issues. The issue 4S board, made in Korea ... -
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 …
... capacitor is added (to remove DC component from the signal), but ... 48K Speccy.
The two red wires soldered to the ... seem illogical, since all Spectrums issue 2 and above already support ... -
Where is the other side from the ZX 48 PCB?Has anyone the other side from the PCB? [url]ftp://ftp.worldofspectrum.org/pub/sinclair/technical-docs/ZXSpectrumIssue3-PCB_Bottom.gif[/url] Micky
... new one because mine from issue 3b is faulty.[/QUOTE]
issue 3B PCB from eBay and ... composite video. These two things would render the DC-DC converter useless and ... -
Powering up a Speccy after long-term storage.Staying at my folks for Christmas. Feels good to be back in God's country again, even if it is -12C outside at the moment. :-o Anyway, I was plannin…
... (12V rail) (this is for issue 3B board)
Unless ... wire and short circuit the two terminals of the 9V jack ... power failure in the internal DC generator (likely TR4), and could ... -
The N64 megathread[Skip this if you want, the short version is "The N64 was deeply flawed, but still has some of the best games ever", so now you can claim you've read…
[QUOTE=WhizzBang;524023]The blur issue was mentioned in EWGFs initial ... are crystal clear on the DC.
[/QUOTE]
I ... />
I'd say that two out of the three games ... -
Second Hand SpectrumHi just joined the Forum. I have picked up a Spectrum at a s/h shop and would like some advice please. I have had two ZX81's packed away for severa…
... advice please. I have had two ZX81's packed away for ... that the output is ? 9v DC however the open circuit (no ... bit more careful with an issue 2 as they run hotter ... -
Three faulty machines - help!I have three Spectrums and all of them have suddenly collapsed and I can?t figure out what?s wrong. New here.... I own three Speccies but all of a …
... all the machines and now two of them work; one of ... a problem. I soldered the DC power contact but there is ... machines, you post here the issue boards used, and supply voltage ... see prompt / can type anything. DC connector problems are usually obvious ... -
Issue 3 power problemHi all, I have an issue 3 board with an odd power problem, I have no -5V in fact, measuring the voltage on this line leads to a surprising result : …
... the two 12v lines as well.
I suspect the issue ... it down somewhere around the DC-DC stage rather than any dodgy ... -
Comcon programmable interfaceRemember this beast, back in 83/84? You used plugs to determine what key each direction on your joystick responded to. It apparently had two fire but…
... remember the COMCON wires up two of the spare pins in ... . fire button, 7. +5 V DC, 8. ground,9. pot x ... open it up, find the two spare pins that are wired ... see that would be an issue.
[QUOTE=joefish;680143 ... -
48k + Spectrum Issue 4S Display IssueHi all! Brand new user here. Growing up I had a zx spectrum for a little bit, and recently I have bought a working 48k + Spectrum (Issue 4). I was…
... be correct for my 48k+ Issue 4S?[/QUOTE]Most of it ... to slip and short between two pins).
Use a good ... is still worthwhile testing each dc supply with the meter on ... -
ZX Spectrum Microvision - REAL retro setup!Some fun pictures. In reality the picture looks some better and more readible, but the camera doesn't pick it up well. [IMG]http://benophetinternet.…
... also reversed three (one issue 4s and two issue 2 boards) over the ... to get rid of the DC offset, but I always keep ... -
Issue 4A repair attemptI think I need some help. I have a nice Issue 4A main board here, which does not give out any video signal. I checked some voltages (the ones that se…
... ?t understand, why does my Issue 4A have 22uF/16V capacitors ... , the voltage is the maximum dc working voltage. In general, as ... 20% margin. This is for two reasons, first, if the voltage ... -
IF1bis StabilityI just thought I would start a different thread relating to the IF1bis, and leave the copyrighters to it elsewhere...:-P I've had mine for a few mon…
... hard-to-track-down other issue at play. My own experience ... the way, for the first two weeks or so, couldn?t ... a maximum of 2 (two), yes TWO output lines simultaneously?
DC-DC converter, until users started complaining ... -
Dot crawl?Hi, As I'm rather new to the hardware of the spectrum, just to confirm: is this video showing "Dot crawl" ? [url]https://www.youtube.com/watch?v=_U…
... got no problems with my ISSUE 6A board. That's why ... ) for the Spectrum and the two interfaces together. It can't ... most of my Spectrums to DC-DC switching regulators to reduce the ... -
Modern PSUHello everyone, I'm looking for a modern PSU for my Spectrums and my dual set of 3.5'' floppy drive+HxC floppy emulator. The one for Spectrum should …
... 14v), but the 12v DC-DC conversion section is notoriously sensitive ... takes a ram chip or two.
Keep ... internal DC-DC converter / inverter was improved in later issue boards (some issue ... 4 variants and issue 5 and ... -
TR4/TR5 replacementHi guys, I've got another Spectrum I'm working on now - an Issue 4S this time. When I originally got it, I powered it up and did the basic tests a…
The issue 4S circuit board caters for two different transistors for TR4, having ... feed to Spectrum 9 V DC with a current limit of ... -
TR4/TR5 replacementHi guys, I've got another Spectrum I'm working on now - an Issue 4S this time. When I originally got it, I powered it up and did the basic tests a…
... ;819524]The issue 4S circuit board caters for two different transistors for ... feed to Spectrum 9 V DC with a current limit of ... repair project - I've got two other working ones to play ... -
Purchasing Advice for an ignorant AmericanHello, I am a retro computer enthusiast who lives in the United States. I am currently looking into importing a model from the UK, and would like whi…
... Early machines shipped with the issue 1 PCB.
[*] ... -12V supplies. There are two versions! The originals used ... 3, all machines used 9V DC (nominal) power supply units ... using more powerful 9V DC PSUs. All these can ... the polarity on the DC mini power plug is ... -
Harlequin 128K minor problems.....Hi All, I've just assembled my Harlequin 128K kit, I had initial problems with it that I traced to not having soldered all of the pins on a couple…
... happens if you swap the two different SRAMs you use? The ... the 5V output of the DC-DC converter. The inductor has to ... the reason of you colour issue it would be good first ... -
Not bored with the Boards.Going through some old tapes stored rather badly I came across an unlikely item that that I must have stored away quickly with other low grade items …
... br /> [list][*]Be an issue 2 or later PCB, but ... not an issue 6A (we want the ... 27C256 32k byte EPROM and two manual switches: one to select ... issue PCB so has the last Sinclair version of the DC/DC ... ), or if an earlier issue PCB, modify the circuit ... -
ZX Spectrum Test PCB I recently read about one of these (I think it may have been the Retroleum site but I am not sure) and I thought "What a great idea" . As pictured …
... br /> [list][*]Be an issue 2 or later PCB, but ... not an issue 6A (we want the ... 27C256 32k byte EPROM and two manual switches: one to select ... issue PCB so has the last Sinclair version of the DC/DC ... ), or if an earlier issue PCB, modify the circuit ... -
48k Issue 6a Very sick indeed.Hi Guys. I have a 48k Issue 6a board that shows a white screen with grey border. The white screen has three black squares spaced equally on the le…
... ok, whats the next potential issue that would give me these ... components involved in generating these two supplies are the "coil" (actually ... />
Once you have the DC supply rails sorted, plug the ... -
Troubleshooting my +2To put this in context: a while back (i.e. late last year and earlier this year) I was looking to put together a compilation of modern Spectrum games…
... many moons ago :) The only two expansions I had was the ... "Beethoven" listing in an early issue of Sinclair User, that allowed ... slightly annoying as I have two +2Bs and I'd prefer ... Tarnpoint adapter, then - it says "DC 300 mA" on it! I ... -
ZEsarUX 6.1 BETAHi I have uploaded a new ZEsarUX BETA version 6.1. You can download it from the usual beta url: https://sourceforge.net/projects/zesarux/files/…
... ZX Spectrum Issue 3 uses the average of the two 0V reference ... 18
C8 DC 2C
2D 28 DC
DE 36 ... -
Timex Sinclair palette in FUSE?Does FUSE support the Timex Sinclair colour palette? I've tried running appropriate software and rom but the palette stays the same as the Ferranti U…
... V signal.
The Issue 3 circuit samples the U ... applies the average of these two values to the LM1889 colour ... note there are in fact two everso slightly different reference voltages ... 18
C8 DC 2C
2D 28 DC
DE 36 ... -
ZX Spectrum colour palette - Equivalent 8-bit RGB values?I'm wishing to do some ZX Spectrum games screenshots on my Mac, but cannot find any information on the net which states what the equivalent 8-bit RGB…
... V signal.
The Issue 3 circuit samples the U ... applies the average of these two values to the LM1889 colour ... note there are in fact two everso slightly different reference voltages ... 18
C8 DC 2C
2D 28 DC
DE 36 ... -
What's the correct Spectrum colour palette?Prompted by the recent SCR-to-GIF conversion thread, I was pondering writing one in Z80 assembler. As I did a LZW compression routine a while ago tha…
... V signal.
The Issue 3 circuit samples the U ... applies the average of these two values to the LM1889 colour ... note there are in fact two everso slightly different reference voltages ... 18
C8 DC 2C
2D 28 DC
DE 36 ...
