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ZX Spectrum 48K AV IssueOK so I dugout my old 48K Speccy today and decided to AV mod it. I did the mod (pretty easy) but the picture I am getting is this. [url=http://posti…
What hadn't been connected properly previously?
The display now is about how I'd expect it to be. Has this Spectrum now been tested with a known to be good set of lower RAM? -
ZX Spectrum 48K AV IssueOK so I dugout my old 48K Speccy today and decided to AV mod it. I did the mod (pretty easy) but the picture I am getting is this. [url=http://posti…
The top left chip, 16 pin, just above and to the right of the ULA. I will order some good lower RAM soon -
Youtube vids of US guy converting speccy into handheldDidn't see it posted here but thought it was a pretty interesting project. Part 1 and 2 here, more to follow. [youtube]6GcwcyL9LgM[/youtube] [you…
... conversion circuitry to run the lower RAM.
Will be fun ... -
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 …
... /> I now see where the lower RAM is located (and soldered into ... trying to swap out the RAM chips. I've done abit ... -
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 …
... />
If you determine the lower RAM is faulty, fit standard IC ... 4116s or one of the RAM modules that I sell.
Next step for fixing my speccy?Hi guys, I've picked up my faulty Spectrum aiming to fix it. So I followed the excellent JouledperCoulomb videos on Youtube for the basics and I am …
... got one or more faulty lower RAM ICs. It might be possible ... set of 4116s or the lower RAM module that I sell.Next step for fixing my speccy?Hi guys, I've picked up my faulty Spectrum aiming to fix it. So I followed the excellent JouledperCoulomb videos on Youtube for the basics and I am …
... got one or more faulty lower RAM ICs. It might be possible ... set of 4116s or the lower RAM module that I sell.[/QUOTE ... />
Thanks Zorn, replacing the lower memory would be my next ...Next step for fixing my speccy?Hi guys, I've picked up my faulty Spectrum aiming to fix it. So I followed the excellent JouledperCoulomb videos on Youtube for the basics and I am …
I didn't know you could fit sockets to the lower ram, interesting. Can anyone link me to where to buy them from? I'd like to do this if/when my 48k ram goes wrong. :DNext step for fixing my speccy?Hi guys, I've picked up my faulty Spectrum aiming to fix it. So I followed the excellent JouledperCoulomb videos on Youtube for the basics and I am …
... could fit sockets to the lower ram, interesting. Can anyone link me ... this if/when my 48k ram goes wrong. :D[/QUOTE]
Next step for fixing my speccy?Hi guys, I've picked up my faulty Spectrum aiming to fix it. So I followed the excellent JouledperCoulomb videos on Youtube for the basics and I am …
Ok, I removed the lower RAM by cutting the legs and ...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…
... assume that if replacing the lower RAM sockets and swapping the ROM ...Short Circuit Damage?Hey Spectrum fans, Currently trying to diagnose what is wrong with my 48K Issue 4B ZX Spectrum. The initial problem was the fact it would not boot -…
... it that it was a lower RAM 4116 IC that you reversed ...Short Circuit Damage?Hey Spectrum fans, Currently trying to diagnose what is wrong with my 48K Issue 4B ZX Spectrum. The initial problem was the fact it would not boot -…
... usually due to faulty upper RAM (a lower RAM fault can also do ... look like now with all lower RAM removed? Are all three power ... supply voltages present at the lower RAM sockets?The REAL cost of modern Video GamesAccording to Yahoo... [img]https://s2.yimg.com/bt/api/res/1.2/y34aqfDLaHi6.dOQKd_yMA--/YXBwaWQ9eW5ld3M7cT04NQ--/http://l.yimg.com/os/publish-images/f…
... who?
It's not how much a typical videogame ... paid per copy, with many not seeing any sort of return until ...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_…
... 9 at one of the lower RAM IC's with the ground ... one or more of the lower RAM IC's have gone bad ... , although upper RAM faults could also cause this ...'Interesting' Issue 2 modSo I've been lurking on this forum for a while and I've got to the point where I want to see if I can repair a speccy.. so I bought me a 'broken' one…
Yeah that connector likes like a "P4" ATX PSU connector... interesting.
One thing i must say, I LOVE those sockets for the lower RAM... If my soldering was abit more solid I would so do that to my 48k!48k - Why Won't it Buzzzz?Hi WOS ;) I bought a load of Spectrum games off eBay and thrown in for good measure was a 48k 1984 Issue 6a circuit board that I was told was for sp…
Remove all lower RAM, check for shorts/broken traces. ... bare board (as far as lower RAM goes), power up and test ... buy one of Zorn's lower RAM boards. That should solve your ...Faulty 48+ Help NeededHi, This is what I get when I plug in the spectrum, this is tuned in. Vid shows a reset. Any ideas, or pointers on the first thing to check. Keyboa…
... power supply voltages at the lower RAM ICs and report back on ...Faulty 48+ Help NeededHi, This is what I get when I plug in the spectrum, this is tuned in. Vid shows a reset. Any ideas, or pointers on the first thing to check. Keyboa…
... the lower ram IC's tomorrow evening, I'm assuming by lower ram IC ...'Interesting' Issue 2 modSo I've been lurking on this forum for a while and I've got to the point where I want to see if I can repair a speccy.. so I bought me a 'broken' one…
Faulty 48+ Help NeededHi, This is what I get when I plug in the spectrum, this is tuned in. Vid shows a reset. Any ideas, or pointers on the first thing to check. Keyboa…
... if there's a faulty lower RAM IC shorting the 12v line ...Hot plugable edge connector?Could the spectrum's edge connector have been made hot plugable without adding much to the manifacturing costs? I was thinking along the lines of a…
... joystick interfaces etc kills speccy RAM" but never got around to ... before.
If not shorting the RAM voltages it must be ...Hot plugable edge connector?Could the spectrum's edge connector have been made hot plugable without adding much to the manifacturing costs? I was thinking along the lines of a…
... circuit (and so destroys the lower RAM) or power is applied to ... it; for example, an upper RAM IC when power is applied ...48K Ram Check Command not workingI am trying to repair my Spectrum 48k. It is having issues loading games, sometimes they load all the way to launch and then the speccy resets. Oth…
Can you post a picture of the display? It could be a lower RAM IC also..
B'Interesting' Issue 2 modSo I've been lurking on this forum for a while and I've got to the point where I want to see if I can repair a speccy.. so I bought me a 'broken' one…
... gives the following on the lower ram ics..
Upper ... ) 0
Lower left (12v) 0
Lower right (5v) 0 ... be because the duff ram is still sat in ... my board to wreck more ram later on! :(
ram' chips is getting hot too ...'Interesting' Issue 2 modSo I've been lurking on this forum for a while and I've got to the point where I want to see if I can repair a speccy.. so I bought me a 'broken' one…
... />
Can you pull all lower RAM IC's, set your meter ... 'd lean towards junking the lower RAM you have and either buying ...48K Ram Check Command not workingI am trying to repair my Spectrum 48k. It is having issues loading games, sometimes they load all the way to launch and then the speccy resets. Oth…
... that picture one or more lower RAM IC's are also now ... voltages on one of the lower RAM IC's using the information ...48K Ram Check Command not workingI am trying to repair my Spectrum 48k. It is having issues loading games, sometimes they load all the way to launch and then the speccy resets. Oth…
Ok, voltages on the lower ram all seem to check out fine.
Are the lower ram chips that flakey that I have killed one in the process of changing an upper ram chip?'Interesting' Issue 2 modSo I've been lurking on this forum for a while and I've got to the point where I want to see if I can repair a speccy.. so I bought me a 'broken' one…
Yes, board needs to be on for this test.
Do pull the lower RAM IC's though before testing, as the resistance measurements shown indicated that the 5v and 12v rails were shorted to ground with the IC's in place....
B48K Ram Check Command not workingI am trying to repair my Spectrum 48k. It is having issues loading games, sometimes they load all the way to launch and then the speccy resets. Oth…
What do you guys think, should I replace all of the lower ram chips?
Or is there a way to single out any faulty ones?
