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The Spectrum Resuscitation ThreadKicking off this thread as a place where people who are fixing/restoring Spectrums (or indeed any other piece of related hardware) can show off their…
... thing for it, solder in lower RAM and ROM sockets, and go ... molex sockets
- Install upper RAM sockets and IC's
The Spectrum Resuscitation ThreadKicking off this thread as a place where people who are fixing/restoring Spectrums (or indeed any other piece of related hardware) can show off their…
... , we have 48K of working RAM:
[IMG]https://farm8.staticflickr ... of my diagnostics, which assumes lower RAM is good and just tests ...Zx spectrum 48+ help pleaseI have just had a look at my spectrum 48+ and I get this [IMG]http://fbcdn-sphotos-h-a.akamaihd.net/hphotos-ak-xfa1/v/t34.0-12/10965632_101526175830…
... power supply voltages at the lower RAM. If all 3 are present ... suspect one or more faulty lower RAM ICs. There are ways to ... due to a faulty upper RAM IC interfering on the data ... unusual, I'd suspect the lower RAM first.Spectrum 48K Ferranti ULAIs there anywhere to get hold of the ICs in the subject? Martin
... is with one of the lower RAM IC's or with the ... voltages on one of the lower RAM IC's, pin 1 should ... is missing, remove all the lower RAM IC's (replacements are readily ...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…
... this without removing all the lower RAM IC's (they're not ...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…
... Ben V to replace the lower RAM ICs. All of the currently ...You get what you pay for-You live and learnDecided to try for a cheap spectrum + on ebay described as not being able to tune it and some keys did not work - haha Duly received and opened up a…
... , could this point to the lower ram ?, voltages seem to be showing ... voltages on the regulator and lower ram.
Not even looking ...You get what you pay for-You live and learnDecided to try for a cheap spectrum + on ebay described as not being able to tune it and some keys did not work - haha Duly received and opened up a…
Is the border colour white? What are the exact voltages measured on the +12v, -5v and +5v rails?
It is most likely a lower RAM fault, but if the border colour is non-white then it could be a faulty CPU also.
BYou get what you pay for-You live and learnDecided to try for a cheap spectrum + on ebay described as not being able to tune it and some keys did not work - haha Duly received and opened up a…
... /> It is most likely a lower RAM fault, but if the border ... .04 V
[B]LOWER RAM[/B]
O V - 0 ...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…
... almost certainly due to a lower RAM addressing error and could be ... caused by faulty lower RAM or more likely, a problem ...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…
... due to either a "lower" RAM fault, an RAM address or data bus ...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…
... does, then that confirms the lower RAM works when accessed by the ... retrieves picture data from the RAM.ZX Spectrum issue 6a - yellow border problem<p>Hello!</p><p>I have problem with my Sinclair ZX Spectrum issue 6A, 48K. </p><p>I have changed low memory (all 4116 IC's) and coil, all electrolyti…
Hi,
it looks like a lower RAM fault. Check the voltages +12V, -5V at the pins 8 and 1 resp., of IC13 (4116) .ZX Spectrum issue 6a - yellow border problem<p>Hello!</p><p>I have problem with my Sinclair ZX Spectrum issue 6A, 48K. </p><p>I have changed low memory (all 4116 IC's) and coil, all electrolyti…
... , 9.9v with ICs.Without lower RAM, picture is http://solair.eunet ... /error01.JPG
and with lower RAM, picture is http://solair.eunet ... 't react on reset, when lower RAM is present. When I press ... reset when lower RAM is not present, border is ...ZX Spectrum issue 6a - yellow border problem<p>Hello!</p><p>I have problem with my Sinclair ZX Spectrum issue 6A, 48K. </p><p>I have changed low memory (all 4116 IC's) and coil, all electrolyti…
... of the sockets of the lower RAM (IC16-IC22)? Check the sockets ...not working issue 3Hi all, I received this mobo from ebay, after start i have this on screen [img]http://forest.no-ip.org/wos/issue3_01/20150728_135908.jpg[/img] …
... completely failed or missing lower RAM and that's not ... surprising given the RAM's power supplies are ... supply voltages presented to the lower RAM ICs, it's quite ... quite possible a failed lower RAM IC or a dead ... remove all of the lower RAM ICs as it's ...not working issue 3Hi all, I received this mobo from ebay, after start i have this on screen [img]http://forest.no-ip.org/wos/issue3_01/20150728_135908.jpg[/img] …
... immediately :)
I remove all lower ram chips, put sockets put new ...not working issue 3Hi all, I received this mobo from ebay, after start i have this on screen [img]http://forest.no-ip.org/wos/issue3_01/20150728_135908.jpg[/img] …
... what mess i do with lower ram :)
[img]http://forest.no ...not working issue 3Hi all, I received this mobo from ebay, after start i have this on screen [img]http://forest.no-ip.org/wos/issue3_01/20150728_135908.jpg[/img] …
... to give up :( for me lower ram is fine.
I think ... etc. digiboard don't pass lower ram on this machine ....
[img ... different working with no result, lower ram chips come from working speccy ...not working issue 3Hi all, I received this mobo from ebay, after start i have this on screen [img]http://forest.no-ip.org/wos/issue3_01/20150728_135908.jpg[/img] …
... to the middle of the lower RAM testing code. Since the IX ... bits in lower RAM), the code then thinks that some lower RAM IC's ...not working issue 3Hi all, I received this mobo from ebay, after start i have this on screen [img]http://forest.no-ip.org/wos/issue3_01/20150728_135908.jpg[/img] …
... :) all 3 devices say bad lower ram, smart card after reset go ... first start is always bad ram ... :) with digi board i have ... time 2 green lines for lower ram... and this speccy runs my ...Dead SpectrumHello guys, I've just bought a dead Speccy 48k (Rubber Keyboard Issue 3 board). Basically, when powered on it initially appears to boot up ok, but in…
... power converter circuit and the lower RAM - but that diagnosis covers pretty ...Dead SpectrumHello guys, I've just bought a dead Speccy 48k (Rubber Keyboard Issue 3 board). Basically, when powered on it initially appears to boot up ok, but in…
... of these tests. All the lower RAM chips gave the correct values ...Dead SpectrumHello guys, I've just bought a dead Speccy 48k (Rubber Keyboard Issue 3 board). Basically, when powered on it initially appears to boot up ok, but in…
... reset that would indicate a lower RAM problem.
It's ... guess then that some upper RAM is faulty, and is then ... 's possible to isolate upper RAM during startup so that the ...Dead SpectrumHello guys, I've just bought a dead Speccy 48k (Rubber Keyboard Issue 3 board). Basically, when powered on it initially appears to boot up ok, but in…
... problem is one of the lower RAM (4116) chips, or another problem ...Dead SpectrumHello guys, I've just bought a dead Speccy 48k (Rubber Keyboard Issue 3 board). Basically, when powered on it initially appears to boot up ok, but in…
I would buy a lower RAM module first. The 4116 DRAM ... chips used for the upper RAM.
To really discover ... need [i]any[/i] working RAM) running from ROM helps. For ...Dead SpectrumHello guys, I've just bought a dead Speccy 48k (Rubber Keyboard Issue 3 board). Basically, when powered on it initially appears to boot up ok, but in…
Cheers Mark.. Think I'll try the lower ram module first then..Dead SpectrumHello guys, I've just bought a dead Speccy 48k (Rubber Keyboard Issue 3 board). Basically, when powered on it initially appears to boot up ok, but in…
... ://zx.zigg.net/URR/) and lower ram module (well, I'd only ...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…
... further as damage to the lower RAM could result...
B
