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RAM issue for potential 48k buy?Hi guys I've got a 48k in my sight for ?20 but... it has an issue: [QUOTE]"I tested the computer and only displayed a distorted screen. Coloured …
... long time. It has a fault with this:
[IMG ... salvaging... I've got another 48k on it's way... I ... as a donor for my 48k if the lower RAM ever ... -
Spectrum 48k ProblemsHi all Got my 48k today but it's playing up abit... First time i turn it on it was like this: [IMG]http://s26.postimg.org/hlg9d3f3d/IMG_20140830_…
... it's upper RAM at fault there.
Pull all ... doing this to all 16/48k Spectrums, healthy or not, if ... -
Interfaces & ROMsHi everyone, I'm currently looking into the various modern interfaces for the Spectrum to allow me to run all my games from an SD card. I have a few…
... /> *No.* If there is a fault with a Spectrum that prevents ... (other than a simple keyboard fault) prevents it from receiving instructions ... working, 1 48K acting as a 16K (upper memory fault, but it ... -
Sea Dragon on a 48KAnyone had This game working on 48K? The archive says it does, but no joy on emulator or hardware so far. Great game, used to play it on the Apple …
... it on pentagon 128 and 48k rubber key, works.. guess it ... using ?
works in 48k mode from the menu *not ... assume the tape is at fault when it's they need ... -
Sea Dragon on a 48KAnyone had This game working on 48K? The archive says it does, but no joy on emulator or hardware so far. Great game, used to play it on the Apple …
... it on pentagon 128 and 48k rubber key, works.. guess ... ?
works in 48k mode from the menu *not ... assume the tape is at fault when it's they need ... to be loaded in 48k mode[/QUOTE]
... EnJOY on a rubber-key 48K Spectrum.
The ... -
Weird symptom number 2...I got a new keyboard membrane for my Spectrum+ plugged it in and low and behold the weird left to right printing of the copyright message disappeared…
... was not detected as a 48K Spectrum.)
On my ... ://www.livewiredesign.co.uk/TestSpec4-fault.png[/IMG]
Picture ... -
Programmable joystick interface issueHello everybody. I have a programmable joystick interface but I am unsure whether it is working properly or not...:confused: I can assign keys to th…
... thinking it's a hardware fault rather than a design one ... pretty much everything from the 48k to the +3. -
Non-Ferranti ULA 6C001E-7?Hello! I don't like Iss2 boards that much but after revising one Speccy like that for a friend, the results were so positive that I decided to have …
... when it's not at fault, because it runs hot - and ... was used for the last 48K Spectrums, both the Pluses and ... -
+2 DIAGNOSTICSIs there a diagnostics test available for the spectrum 128 (+2) in tzx format? I've just obtained a spectrum +2 Grey and all looks fine with it on f…
... a little better than the 48K test, although it's still ... RAM is tested, if a fault is found then the computer ... colour to indicate where the fault was found, and will then ... -
128k Toastrack Composite Video output confusion!Hi everyone. Ok, so I have a couple of 48k's that I have performed Wombles fantastic composite mod on. They work great here in Canada on my big scre…
... the cable may be at fault. I took it apart last ... already did that with a 48k power supply - it looks the ... -
Speccy Vs Amstrad CPC Vs C64I hope no one minds me posting this here as well as in the announcements section. I'll delete it if there is a problem. It's childish fun but can I …
... DD disk system was loading 48k snapshots in a few seconds ... , that's not really the fault of the 6502 acting as ... -
Double keystrokes on zx spectrumHappy New Year everyone. I have this spectrum 48k issue 3b I?ve been working on now and then. I have replaced upper rams, installed a lower ram repla…
... now have the same / similar fault? (This would confirm that the ... 3B to see if the fault returns.
Why do ... ? Well, because working Spectrum 16k/48k ULA's are rare and ... -
48K Not booting properlyBought another faulty spectrum from Ebay. This one, when you turn it on, it looks like it's going to boot OK, but when it gets to the point where it…
... you would expect for a 48K spectrum.[/QUOTE]
Not if ... strongly suggest an upper RAM fault. If you had forced the ... often reveals which is at fault. Otherwise, you're probably going ... -
48K Not booting properlyBought another faulty spectrum from Ebay. This one, when you turn it on, it looks like it's going to boot OK, but when it gets to the point where it…
... (as I have a faulty 48k of my own to fix ... by the ULA being at fault?
I'm only ... -
48k noise problem..Hi guys, I need some hardware advice with my old 48k. The machine is VERY noisy - I've fixed the video noise by performing the 'composite' mod, but …
... there may be a hardware fault??
I'd hoped ... a common problem with the 48k, but perhaps it's just ... -
Video ZX Spectrum+ 48k<span>Good day ... is a bit of time that I try to fix my zx spectrum ... I replaced the ram 4116, all electrolytic capacitors ... but the monitor loo…
... if the fault moves.
Note that for 16k/48k/plus ... broken, it does hinder the fault finding advice we can give ... it points to a ULA fault.
The program can ... -
ULAAre ULA's (for Spectrum 48k's) interchangeable through the different issues? To give some background, to work out what was wrong with an old speccy I…
... distinct versions of the Spectrum 48K ULA:
- 5C102E: Original ... . Have a I/O contention fault that necessitates the 'dead cockroach ... as a replacement to all 48K PCB issues
- 5C102E/5C112E ... -
Spectrum CapacitorsLooking for some opinions here, if I may? In the 80's and 90's I used to repair Spectrums and other machines for a living so I'm reasonably famili…
... . And the inside of a 48k Spectrum does get rather warm ... the case and trace another fault), and the fact that not ... -
FREL Comcon Programmable Joystick Interface not working on 128k but on 48kAnother day, another problem :-) My FREL Comcon Programmable Joystick Interface [url]http://www.worldofspectrum.org/infoseekid.cgi?id=1000070[/url]…
1) Betadisk 48k Interface is not working on ... /> But I think thats not fault of the Toastrack, the Beta ... Grey).
2) Betadisk 48k compatible Gamma-Disk-Interface is ... /> But I think thats not fault of the Toastrack, the Gamma ... -
ZX Spectrum issue 2 has only blue tintsRecently I've bought a 16k speccy and ran into some issues with it. Faulty keyboard, broken caps, no stable frequency, faulty lower RAM chip, it bein…
... 't suppose you have another 48K Spectrum you can swap the ... be a ULA fault. You should find the fault follows the ULA ... -
Opus Discovery "the big switch on" (after 20 years)I have a few of these Opus Discovery's with different Eproms in that have not been swiched for 15-20 years or so . I am in no rush to switch any on …
... Discovery and stick with the 48k "Goldfinger" . This means the "grill ... so there cannot be a fault with that can there?And ... -
Dead issue 3b with black and white barsHi all, I've been donated an issue 3b which has some nice black and white bars with a few flashing blocks. I've done a few RAM tests and could spo…
... to the job. A single fault on a silicon die resulted ... the "upper" DRAM chips in 48k machines were normally 32k DRAM ... -
DEFFNder: a small library of BASIC functions written in Z80I've published a small library of 15 Sinclair BASIC functions written in Z80. I wrote it last year for a project of mine. Some of them are generic, s…
Whoops. My fault on the demo crashing on ... which is printer buffer on 48K but is extra System Variables ... -
Issue 3b boarddiode ID5 and cap C47 are missing from my board will these have any effect on system powering up. I have checked the voltages on the 7508 and its …
... 1A, but a normal 48k Spectrum typically uses around ... br /> Unspecified 48k+ RAM uses 562mA (keyboard fault, but otherwise works ... br /> Unspecified 48k+ RAM uses 603mA (keyboard fault, but otherwise works ... repair pile)
Issue 6A 48k+ RAM uses 537mA
... -
Bizarre ZX Spectrum faults (also possibly relevant to Spectranet compatibility problems).I'm attempting to repair an issue 4A 48K ZX Spectrum and am encountering some very strange problems. For my own records I've given this computer the …
... different 48K ZX Spectrums (various issues) and the display disruption fault occurs ... />
Therefore it seems the fault only occurs when my hands ... -
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 …
... gave up RGB on the 48k and used direct leads to ... now is "Can any obvious fault be found by opening it ... -
ZX-Uno moddingStarting with ZX-Uno case modding I have not yet received my ZX-Uno yet (it is in the post) but I know that I will have to do at least one mod …
... though to have found the fault .
Too late for ... ) would not tune to a 48k Spectrum at all : it was ... telly that "just misses" its 48k Spectrum setting when you do ... -
Wheels of Fire: Chase HQ = duff masteringAndy Barker mentioned Chase HQ in the Wheels of Fire compilation as being WIP way back in April 2005... http://www.worldofspectrum.org/forums/discus…
... fast.
It worked in 48k and 128k modes. I don ... or other had a duplication fault. In rare occasions I may ... -
Speccy 128k Toastrack capacitorsDoes anyone have a list of all the electrolytic capacitor values in a speccy 128k toastrack they could post...I've looked around and see plenty for …
... banks not used by 48K mode have a fault. If it finds ... -
What to buy +2, +2A, +2B, +3??Hi all I've always wanted to buy a 128k Spectrum and I've seen some lately in eBay going for cheap. The 128K+ is expensive I understand because of…
... , ZX Spectrum 16k, ZX Spectrum 48k, ZX Spectrum 128k, ZX Spectrum ... grey PSU to power a 48k Spectrum, but it's not ... +3 which has a design fault with it's audio circuitry ... ) does indeed have a manufacturing fault. There is a thread about ...
