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16 K Sinclair Spectrums Still Available?Hi. I wanted to know if the 16 K Sinclair Spectrums are still available to buy. I have looked around on the net without any success. Maybe someone kn…
[QUOTE=rustyredline;415383]the lower ram 16k should not be touched ... ...
4116=Lower ram=16K
4164=Upper ram=32K
ram is not working.
Spotted on ebay.Just spotted this possible bargain on ebay, its collection only but no ones bid on it yet still a few days before it ends though. Disclaimer: I am …
... 1 has to have dodgy lower ram.
but now it ...Someone can help me to fix my Zx Spectrum?I did a video about the startup: [url]http://dl.dropbox.com/u/1566495/ZXSPECTRUM03.mp4[/url] I have replaced the ULA with a working one (same proble…
... also a -5V used by lower RAM).
[*]Check clock signals (video ... to check function.
[*]Replace lower RAM (because that's [I]very ...Someone can help me to fix my Zx Spectrum?I did a video about the startup: [url]http://dl.dropbox.com/u/1566495/ZXSPECTRUM03.mp4[/url] I have replaced the ULA with a working one (same proble…
[QUOTE=RetroTechie;430214]
[*]Replace lower RAM (because that's [I]very[/ ... use a hungry horace cart + ram turbo / interface 2... to help ... starts up with that in.. = lower ram issue :)Someone can help me to fix my Zx Spectrum?I did a video about the startup: [url]http://dl.dropbox.com/u/1566495/ZXSPECTRUM03.mp4[/url] I have replaced the ULA with a working one (same proble…
My guess from watching the video: Lower RAM or the ROM is defective.Someone can help me to fix my Zx Spectrum?I did a video about the startup: [url]http://dl.dropbox.com/u/1566495/ZXSPECTRUM03.mp4[/url] I have replaced the ULA with a working one (same proble…
... , the voltage will be somewhat lower, and probably OK.
Lower RAM or the ROM is defective ... /> Check the the 4116 (lower 16K of RAM) have all correct voltage ... -12V are absent or much lower, then check the power circuits ...Someone can help me to fix my Zx Spectrum?I did a video about the startup: [url]http://dl.dropbox.com/u/1566495/ZXSPECTRUM03.mp4[/url] I have replaced the ULA with a working one (same proble…
... =gibs;431155]
If the ram is faulty and if I ... fault is in the upper RAM bank (the 32K bank).
lower RAM bank (the 16K bank).
Lower RAM cannot be ... if any of the RAM chips in the lower bank is hotter ...Broken or upgraded ZX Spectrum 48kHello First i want to say hello to everybody. I have a new ZX Spectrum 48k in my collection. Seller said that it is broken (no picture). I have this…
... sufficient for that (even if lower RAM, ROM or CPU isn't ...IM2 Loading on +3EHi there Speccy Guru's, As some of you know, I've spent a while building the ultimate image for +3e, it's currently at 6000+games and demos and i've…
... up an interrupt table in lower ram. I know that the 128K ... /shorter due to different contended ram banks on newer/older 128 ... sets up DOS without touching RAM pages) but on CF card ... changes loads of stuff in lower ram. In the ROM its a ...Remove +12 Volt itemsWhich items can be removed on a ZX48K issue 4b PCB if I don't need the +12 Volt? Micky
... the PCB? What 32 K RAM have you used?[/QUOTE]No ... 8 4164 rams for the lower ram instead 8 4116 rams.
The 34k ram is a NEC D43256BCZ-70LL ... . It is for the upper ram.
MickyRemove +12 Volt itemsWhich items can be removed on a ZX48K issue 4b PCB if I don't need the +12 Volt? Micky
... 3 ICs which replace the lower RAM?Remove +12 Volt itemsWhich items can be removed on a ZX48K issue 4b PCB if I don't need the +12 Volt? Micky
... 3 ICs which replace the lower RAM?[/QUOTE]
Ehm... no. Not ... replacement for the Speccy's lower RAM too).
Before that ... , maybe they work as Spectrum lower RAM too? And: anyone tried 16K ... old 4116's (and upper RAM?) with modern IC's, you ...Broken speccys on ebayI often see broken speccys on ebay,the usual listings of no display on pic etc,i know could be opening a can of worms when buying one,so can [B]some[…
... 's what I found..
lower ram issues, no biggy to fix ... with a cart.. showed the lower ram was bust in 1... thats ... a cart will bypass the lower ram, well first bit..
Yeeeees finally got one!If anyone wants to make me an offer for the ultimate games pm me. I'm not that bothered by them tbh. [URL="http://www.youtube.com/watch?v=mVgYKMTqL…
... :)
as for the Ram turbo.. the interface 2 clone ... :) ) ya know it's the lower ram that's f'd.. :) if ...Hypothetically....If you were putting together a "Spectrum +4" what presently available hardware would you include. My criteria would be total comparability (or as ne…
... Spectrum not?
RAMCSL switches lower RAM off (16384-32767)
RAMCSH1 ... switches first part of RAM off (32768-49151)
RAMCSH2 ... switches second part of RAM off (49152-65535)
With ...Hypothetically....If you were putting together a "Spectrum +4" what presently available hardware would you include. My criteria would be total comparability (or as ne…
... Spectrum not?
RAMCSL switches lower RAM off (16384-32767)
... RAMCSH1 switches first part of RAM off (32768-49151)
... RAMCSH2 switches second part of RAM off (49152-65535)
... is rare memory. Static ram with battery backup is better ...RGB to VGA convertor for ZX128/+2/+2A/+3David Luftner release source code (VHDL) of SCANDOUBLER for ZX128/ZX128+2/+2A/+3: [url]http://velesoft.speccy.cz/other/scandoubler-for-zx128_fixed_by…
... required, something needs to refresh lower RAM).
The main issue ...I Just Listed some games on eBay[URL="http://shop.ebay.co.uk/shineyflower/m.html?_nkw=&_armrs=1&_from=&_ipg=&_trksid=p4340"]I've just listed some games on eBay, and a couple of Larg…
hairy, did ya try em with an interface 2 and a cart? just a thought.. thats how I knew the lower ram on 1 machine was knackered :)I Just Listed some games on eBay[URL="http://shop.ebay.co.uk/shineyflower/m.html?_nkw=&_armrs=1&_from=&_ipg=&_trksid=p4340"]I've just listed some games on eBay, and a couple of Larg…
... .. thats how I knew the lower ram on 1 machine was knackered ...Speccy repairs?I've finally got round to testing all the various Spectrums that I seem to have accumulated over the years and discovered that "my" two machines (i.e…
... or lower RAM is bad, most of the time it's lower RAM that ... />
Again, most likely bad RAM.
[quote]
[*] ... .
With suspect bad lower RAM you also need to check ... , then it actually kills the lower memory chips, the TMS4116 data ...Spectrum lost upper memoryHi again, I have a Rubber key Spectrum(issue 4S) which lost it's whole upper memory. It's worked okay, but i forgot it on over last night. My son wa…
... />
the heat on the lower ram is how a friend said ...ZX81 composite outAnyone know if the composite out mod for the speccy is the same for the ZX81 before I crack it open and destroy one? Thanks.
I wanna sort out 1 duff zx81 I have.. see if I can get it working again.. I bought another ULA for it. but the internal RAM mods, I do have ram packs.. but well the old wobble isn't good.The Sadness of my Decaying Speccies.I've been avidly collecting ZX Spectrums since the late 90's and whilst at the time of the late 90's and early millennium my Spectrums and associated…
9 times out of 10, RAM problems are with lower RAM (the 4116 chips ... more fragile than the upper RAM. Usually it's just one ... edge connector to test the RAM and tell which chip is ... bad.
4116 RAM was pretty much obsolete in ...The Sadness of my Decaying Speccies.I've been avidly collecting ZX Spectrums since the late 90's and whilst at the time of the late 90's and early millennium my Spectrums and associated…
... times out of 10, RAM problems are with lower RAM (the 4116 chips ... more fragile than the upper RAM. Usually it's just one ... edge connector to test the RAM and tell which chip is ... bad.
4116 RAM was pretty much obsolete in ...The Sadness of my Decaying Speccies.I've been avidly collecting ZX Spectrums since the late 90's and whilst at the time of the late 90's and early millennium my Spectrums and associated…
... saying, to be problems with lower RAM.
To amplify why ... the edge connector, thus killing lower RAM and usually the switch mode ...The Sadness of my Decaying Speccies.I've been avidly collecting ZX Spectrums since the late 90's and whilst at the time of the late 90's and early millennium my Spectrums and associated…
Lower RAM (4116) replacement is [I]technically[/ ... />
Uses ordinary 32Kx8 static RAM + 2 logic IC's - all ... my own Speccy collection, most lower RAM still works, but keyboard foils ...Maybe a bargain ?Hi guys, just won this on Ebay, Fingers crossed it all works ok, I may have got a bargain, what do you think ? [url]http://cgi.ebay.co.uk/ws/eBayISA…
the problem with speccy's is well people don't test em / sold as seen..
main 2 issues that could be a problem is bad membrane or lower ram prob.. hopefully neither and both are fixable.Help with broken SpectrumHi There, Just received a ZX Spectrum computer. It's an issue 3B (48k version). When I power it up (9V centre pin -V) nothing happens. It's complete…
... do that is on the lower RAM chips (lower left corner of board ... left) = -5V
Pin 8 (lower left) = +12V
And ... to remove the upper 32K (RAM chips in middle of board ...zx spectrum +2 troubleshootingHi There I am new here and I need some advise as to where to look for issues on my zx spectrum +2 it was working fine this morning .. then while pl…
... map you have contains a lower RAM region (16K) which belongs to ... contended bank, and an upper RAM region (32K) which belongs to ... />
If the non-contended RAM is damaged, the machine can ... .
If the contended RAM is damaged, the computer hangs ...
