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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…
I'd just swap them all out if it was me. Put sockets in and fit nice new ram modules or use Zorn's lower RAM replacement module. -
Spectrum Black & White Image??I've just got my machine to load but now I'm noticing the picture is black and white!? Whats wrong!? Now i think about it I've never loaded a game o…
... 12v line (but then your lower RAM would be toast)
2 ... -
Spectrum Black & White Image??I've just got my machine to load but now I'm noticing the picture is black and white!? Whats wrong!? Now i think about it I've never loaded a game o…
Giving up on SpectrumsHi all... Bit of a downer post here... I'm really close to giving up on Spectrums.. My 48k has given me nothing but head aches since day one... and …
... mins, then died of a lower ram fault. :-(
The later ...Spectrum sometimes boots with graphic issuesA while ago, my Spectrum 48K (issue 3B) broke down after fiddling with a brand new joystick interface in combination with DivIDE. Today I tested the …
... would suspect one of the lower RAM chips.
Looks like ... generate random pixels. The lower 16KB of RAM is after all used ...Spectrum sometimes boots with graphic issuesA while ago, my Spectrum 48K (issue 3B) broke down after fiddling with a brand new joystick interface in combination with DivIDE. Today I tested the …
I agree, lower RAM most definitely, fixed one with ...ZX Spectrum upper RAM module (4532/4164 replacement)Following the [URL="http://zx.zigg.net/LRR/"]lower RAM replacement module[/URL], there have been quite a lot of requests for something similar for th…
... following means:
- Lower/Upper RAM module replacements
- switch mode ... regulator -220mA (400mA)
- with Lower RAM module -105mA (295mA)
- with ... Upper RAM module -35mA (260mA)
- with ...ZX Spectrum upper RAM module (4532/4164 replacement)Following the [URL="http://zx.zigg.net/LRR/"]lower RAM replacement module[/URL], there have been quite a lot of requests for something similar for th…
... in an order for the lower RAM module and send a message ... saying you want the upper RAM module instead.Where's Znor?Where is he? Is he gone for good?:sad: I miss his bread themed saucer pics.
... on a camping stove. After not seeing any posts for a bit ...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…
... and replaced all of the lower ram chips and now the Spectrum ... me 32775
Which ram chip is this pointing to?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…
... and replaced all of the lower ram chips and now the Spectrum ... me 32775
Which ram chip is this pointing to ... test cannot tell you which RAM chip is faulty :-x
RIP Alvin StardustAnother day, another celeb dies.... Was never really a fan but that's another golden oldie passed away RIP [url]http://www.independent.co.uk/news/pe…
[QUOTE=csdaveuk;798556]At least we still have Shakey...[/QUOTE]
I'm not seeing the positive here?...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 -…
... the same on all the lower RAM chips. The Voltage Regulator showed ...48K Issue 6A board only showing B/WI have a 48K Issue 6A board here, which only shows a B/W composite video signal on both, the modified RF-out, but also on the expansion bus (using my…
... line would take out the lower ram.
[URL="http://www ...Smokin... more 48k woesHi, it looks like I've converted another Spectrum 48K+ into a smoke machine. I'd been rebuilding an Opus Discovery unit and everything looked good. …
+12v will be on the lower RAM sockets on IC6 through IC13, along with -5v and +5v.
-5v will be on pin 1, and +12v should be on pin 8.
BSmokin... more 48k woesHi, it looks like I've converted another Spectrum 48K+ into a smoke machine. I'd been rebuilding an Opus Discovery unit and everything looked good. …
... ]+12v will be on the lower RAM sockets on IC6 through IC13 ...Smokin... more 48k woesHi, it looks like I've converted another Spectrum 48K+ into a smoke machine. I'd been rebuilding an Opus Discovery unit and everything looked good. …
... />
B, is that the RAM 12V supply?
According ... 1K resistor, so will be lower than the other 3.
lower RAM IC's. I couldn't ...Issue 2 Spectrum - Black screenHi I have an issue 2 spectrum which I'm having some issues with. I bought it on ebay so have no idea of the history or how it came to be broken. Whe…
I forgot to mention above, that all of my voltages 0, -5, +5 & 12v are all present on the lower ram chips.
Slightly on the low side, but from what i can tell, within tolerance.Issue 2 Spectrum - Black screenHi I have an issue 2 spectrum which I'm having some issues with. I bought it on ebay so have no idea of the history or how it came to be broken. Whe…
... />
This leaves either lower RAM, upper RAM, or a combination of both ... /> You can isolate the upper RAM when powering on the machine ... to rule out further faulty lower RAM as a continuing issue.
My experiment retro graphics, toolI tried to do a little picture converter into retro computer graphics. Supports only BMP format. [I] I programmed in FreeBASIC.[/I] [B]Review:[/B] […
... the video (as I 'm not seeing the imageshare pictures), but you ...Issue 2 Spectrum - Black screenHi I have an issue 2 spectrum which I'm having some issues with. I bought it on ebay so have no idea of the history or how it came to be broken. Whe…
... it still "smells" like a "lower" RAM fault.
Which chips ...Issue 2 Spectrum - Black screenHi I have an issue 2 spectrum which I'm having some issues with. I bought it on ebay so have no idea of the history or how it came to be broken. Whe…
... installed to carry the new lower RAM IC's.
I ...Issue with Issue Two[img]https://dl.dropboxusercontent.com/u/25300140/Spectrum/Edited_ImageEasyImageEditor_20141111_84.jpg[/img] I'm working on an Issue Two that was sh…
... square one. Both upper and lower RAM has been replaced. By the ... I changed the upper RAM. Disabling the upper RAM in bootup doesn ...Issue with Issue Two[img]https://dl.dropboxusercontent.com/u/25300140/Spectrum/Edited_ImageEasyImageEditor_20141111_84.jpg[/img] I'm working on an Issue Two that was sh…
... very strongly suggested the upper RAM. On the other hand, changing ... the upper RAM revealed hints that the lower RAM was bust. Aand ...Issue with Issue Two[img]https://dl.dropboxusercontent.com/u/25300140/Spectrum/Edited_ImageEasyImageEditor_20141111_84.jpg[/img] I'm working on an Issue Two that was sh…
... cases such as this where lower RAM faults are suspected then it ... better to ensure that the lower RAM is checked and voltages are ...Detecting flash mode inversionsIs is possible to detect with certainty when flashing characters change from normal to inverted and vice-versa?
... . When the restart routine wipes RAM during the memory check FRAMES ... only changes the screen display, not the video RAM.Detecting flash mode inversionsIs is possible to detect with certainty when flashing characters change from normal to inverted and vice-versa?
... am I supposed to be seeing when this occurs? Whichever one ... , whatever it is, I'm not seeing it.
Here's ...Detecting flash mode inversionsIs is possible to detect with certainty when flashing characters change from normal to inverted and vice-versa?
... , whatever it is, I'm not seeing it.[/QUOTE]
My ...48K Upper memory issues?Having more issues with the 48K spectrum I just fixed that had the black screen in this thread [URL="http://www.worldofspectrum.org/forums/showthread…
... the fact the spectrum is not seeing enough memory, I occasionally get ...
