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Dead Spectrum diagnosis and desolderingI have two dead Spectrums - one I'm pretty sure is caused by bad memory, and the other - well, perhaps a bad ROM, perhaps a bad CPU (it gets halfway …
... , it depends on some display RAM working. It's very clever ... if you have some bad RAM, it'll show which chips ... is a very nice little replacement RAM also, available on the same ... -
48k Out of memoryIv just had a 48k Speccy arrive today. The keyboard wasnt working right so I changed that. Now when I tried to load Cyclone it started to load ok fo…
... can buy off the shelf replacement RAM but you have to ... work out what type of RAM your Spectrum currently has. ... />
There are 8 RAM banks that make up the ... upper 32K of RAM. Each RAM chip holds one bit ... two of the eight RAM chips require replacing so ... -
Colour blocks on displayHi all, I have just acquired another Sinclair product, my first one being a C5, it's a 48K ZX Spectrum. It shows colour blocks on the display when p…
... ULA fault, but the lower RAM is far more prone to ... failing could take out your replacement RAM. -
Issue 3 board - Free to good homeI have an issue 3 board that someone could scavenge for spares or even repair if they're willing to pay the p&p. I got it off someone on Amibay in a…
I am interested in taking it off your hands. I have a couple of dodgy Spectrums here that need replacement RAM. -
Keyboard Membrane Speccy +Grrrr! I'm having real problems getting the keyboard on my resurrected Spectrum+ to work reliably. I changed the keyboard membrane, and all seems to…
... be needing to source new/replacement RAM, ULA and CPU chips for ... -
another faulty zx spectrum +2 to fix!!!Hello to all, I'm new here... I have got a faulty +2 (gray) and start to try fix it... I have read the treads of xaris_sm and Pluto63 as background…
... choose to remove all ram because in the meantime ... two other ram chip goes to very ... will order this two replacement ram...but how many important ... />
the dead ram chips are mixed, they are ... br /> now on the contended ram I have chips with mixed ... -
Help! +3Just got my +3 working after replacing the drive belt. All was OK until I plugged in my Multiface 3 (known working with a +2a) and the computer went…
... , and I found that the RAM is socketed :)
Removing ... border. When you receive your replacement RAM, this might be a good ... -
Seen any ebay madness?? post it here !!!What with some high prices fetched on speccy games over the past few days , thought it might be an idea to keep a WOS record of some of the higher fi…
... it would be fully recapped, replacement ram, new keyboard membrain and Rich ... 's replacement faceplate. Probably the composite modification ... -
A tally on the number of successful builds of the Harlequin[SIZE=4][COLOR=Green][U][B]A tally on the number of successful builds of the Harlequin.[/B][/U][/COLOR][/SIZE] Please post your successes below :-) …
Mine's built and working :) @ at 16K.
Awaiting a replacement RAM to bring me back up to 48K.
DenisM -
Fixing a poorly Issue 3 - Odd faults.Here's one for you Spectrum fixers, I warn you it's a long one. I've spent a couple hours this evening doing several repairs on a rubber keyed Speccy…
... on between the lower ram and a resistor where ... broken track was, a replacement ram ic had been fitted earlier ... card diagnostics. However after replacement, I still had the ... and removed all the ram ic's which to ... was caused from the previous ram repair. So I've ... -
How can I fix a problematic Retroleum Smart Card. I did not do anything "WRONG " with it but I did but it on a flexible cable and this seems to have "upset" it .Since then It does not perform the …
... reasons:-
1) The replacement RAM chips can be expensive and ... in .
3) Buying RAM chips may be a waste ... the lines of "problem with RAM chips!" .The exclamation mark could ... one good one" using existing RAM chips taken from the others ... -
16K/48K Lower RAM (4116) replacement.You may want to read [URL="http://www.worldofspectrum.org/forums/showthread.php?t=37957"]this thread[/URL] for background information on the quest t…
... found an SRAM based replacement for the lower RAM that works in ... the column address to the RAM and so there isn't ... that appear on the lower RAM address lines. In particular, in ... is the ZX Spectrum Lower RAM Replacement Module, pictured below:
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…
... zx.zigg.net/LRR/"]lower RAM replacement module[/URL], there have ... similar for the upper 32K RAM in a Spectrum.
... zx.zigg.net/LRR/"]lower RAM replacement module page[/URL] and ... circuit as the lower RAM replacement and emulates dynamic RAM.
...Upper RAM replacement module issues with the DivideI got my new upper ram replacement module from Zorn yesterday and seem to be having some issues. When the machine is without the Divide it boots up …
... got my new upper ram replacement module from Zorn yesterday ... manages to boot, the ram passes the memory test ... When I put the upper ram chips back in place, ... />
The upper ram are not on the "OKI ... upper RAM and uses unusual timings that the replacement can ...zx.zigg.net lower RAM replacement module: Still shipping?Hi everyone I'm trying to resuscitate my 48k issue 6a, and I bought the lower RAM replacement module from zx.zigg.net. The paypal payment went thr…
... , and I bought the lower RAM replacement module from zx.zigg.net ...zx81: is there a 16kb ram limit for basic?first of all, sorry to all about posting a question about zx81 in a forum mostly about zx-spectrum - i didn't want to offtopic questions here anyway,…
... time were only predicting 16kb ram extension, and this may the ... kind of zx81 alternative rom replacement supports whole 32kb, 48kb or ...4116 Ram chip replacements?Hello. I am in the work of gathering replacement parts for my speccy 48k. And I would like to know what chips is good replacement for the 4116 ram ch…
... in the work of gathering replacement parts for my speccy 48k ... what chips is good replacement for the 4116 ram chips, and where ...Replacement Spectrum +3 RAM ChipsHi all Bought a +3 last week with a RAM issue, so I have removed the old chips, added sockets and now just need a full set of chips to get her back…
... +3 last week with a RAM issue, so I have removed ...Spectrum +2 (grey) RAM issueHi, I?ve got a ZX Spectrum +2 (grey) with what I think is a RAM issue. I used to be able to load games very reliably by playing converted TAPs and …
... what I think is a RAM issue.
I ... that device is a 128K RAM test firmware.
... url], page 4) means that RAM page 5 has an issue ... think this is a suitable replacement: [url]http://www.mutant- ... the PCB is for which RAM page?
I ...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…
... of RAM. Not surprising, and I've now got some replacement parts ... the voltages on the lower RAM IC's show they are ... still wrong on the lower RAM IC's, so I'm ...MK14 keyboard replacementI'm the proud owner of a Science of Cambridge MK14! It seems fully functional, but the keyboard is a disaster - some keys don't seem to work at all, …
... checked through Google for any replacement keyboard, but it seems there ... to search for...
RAM I/O chip was not ...Replacing lower RAM 4116 ZX Spectrum 48k - desoldering advice please?A long post, but interesting pictures perhaps. :) I'd like some advice: (also apologies I think I picked the wrong 'Hardware' category for this, plea…
... seemed to indicate a lower RAM issue. It hadn't been ... chips, nine 16-dip sockets, replacement keyboard membrane. My plan is ...How do I know the RAM size?Just left my parents after cleaning out my pile of old stuff in their basement. Know what I found? My old ZX Spectrum.... Those were the days! Never …
... ZX81, though.
3K om RAM, my friends!
My question ... I tell what size of RAM I've got in my ...Replacement power suppliesIs it possible to get a replacement power supply for the old speccys? The high Amperage is a problem: 1.4A for the rubber-keyed 48K. Know where you c…
Is it possible to get a replacement power supply for the old speccys? The high Amperage is a problem: 1.4A for the rubber-keyed 48K. Know where you could get one that would handle it? It wouldn't need to be an original.Spectrum spares / repair jobsI recently bought a few faulty Spectrum 48+'s and have built a fully functional unit from the best bits of them, however this has left me with two pa…
... be repaired or dismantled for replacement ULA / RAM chips to repair other ...Replacement chipsAfter much digging around on here, it seems to be the general consensus that the ULA could be causing the problems im having (spectrum is deaf to the…
Clone Project feedbackFinally i now have some time to start again with my clone project. I have decided to drop the 48k project and go directly on a 128k clone. This migh…
... is not to do a replacement board or to emulate other ... /> - CPU: Z80C
- RAM: >= 512k
- Video RAM: 256k (512k)
HELP 4532 or 4864 RAM wanted !Hello My real spectrum fell off yesterday I know that one RAM memory chip is out of order There was 8 X HM4864P-2 but I saw in the Spectrum schemati…
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I know that one RAM memory chip is out of ... here to set 16K of RAM so 32K are enough to ...
