-
Spectrum Plus display issueHi, does anyone know if this is fixable at all by someone with no experience? From looking on a similar post on World of Spectrum forum they mention…
... example), I can tell RAM is working, but some ... may be faulty. Because RAM is used for CPU ... CPU cannot work correctly if RAM is faulty. There is ... if you short a RAM chip data output line ... />
As for mentioned RAM failure interfering with data bus: you ... -
New user with a dead 48k issue 2Hello all I've found my way here from watching some excellent youtube videos by Joulesper Coulomb in an attempt to fix a issue 2 rubber key 48k I bo…
... caused by lower RAM failure, or by a CPU failure. Less likely (although ... possible) is a ROM failure.
However the low ... -
RobikHello to all, Is anyone experienced on this russian clone? I have one at hand with corrupted screen (but it boots and replies to keyboard inputs so …
... the problem is in the RAM bank or the buffers/shift ... every memory location, as a RAM failure would suggest. -
RobikHello to all, Is anyone experienced on this russian clone? I have one at hand with corrupted screen (but it boots and replies to keyboard inputs so …
... the problem is in the RAM bank or the buffers/shift ... every memory location, as a RAM failure would suggest.[/QUOTE]
RAM memory, i don?t know ... it the voltages of the RAM. -
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 :-) …
... . One of them reports upper ram failure every time with Z84C0008 installed ... -
Sudden death of ZX Spectrum 48KHello A friend gave me a 48K rubber keyed Spectrum. I brought it home, hooked it up to my little TV and powered it up. I was very happy to see t…
... simpler high or low RAM type selector, not near ... was supplied with a RAM upgrade kit, however. ... address connections for OKI RAM when the appropriate link ... remove the socketed upper RAM chips and power ... can rule out upper RAM failure if the Spectrum initializes ... -
can a backup device damage the spectrum ROM?as above. been using a specmate device which seems to have corrupted my speccys ROM.
...
Failure of one or more 4116 "lower" RAM chips is ... (Z80, ULA, ROM, RAM) can potentially be damaged... So ... which has a comprehensive RAM test program, even ... all on their own. RAM failure is far more common ... than ROM failure. Your machine may be ... -
ZX Spectrum +3 repairI have my first +3 here, and it needs repairs. Hoping someone here can help me out. When I power it on I get this screen with black and white line…
... chips (including the ROM and RAM) in the system
[/list ... , control or data bus failure, ROM failure or RAM failure will most likely result ... -
Can I fix it?This PC was stored in a the spare bedroom at a jaunty angle of 30 degrees for several months. I powered it up today and was greeted with a 1..2.3. b…
this http://www.tomshardware.co.uk/forum/96993-30-beeps-pause-repeat says it could be ram failure?
if you have 2 in, try both singularly, or if you have another stick that in see what happens -
The Different Approaches To Upgrading the ZX Spectrum from 16K to 48K This is probably something that has been covered before . I will take a look to see if I can find anything on WOS
... is also interesting that RAM pack wobble and other ... a common cause of lower RAM failure , I got a ... in showing up lower RAM failure though I cannot be ... wobble from the Cheetah RAM pack I got with ... upfront initial RAM upgrade risk 2) ongoing Ram pack wobble ... -
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 …
... this . It said lower RAM was OK . Upper Ram failure at $FFFE .Then ... colour palette test confirms upper RAM error encountered . Suspect IC21. IC ... IC21 and what caused the failure ? Does it need a recap ... -
Not bored with the Boards.Going through some old tapes stored rather badly I came across an unlikely item that that I must have stored away quickly with other low grade items …
... I started , as the lower RAM failure shown with the IC21 chip ... speak with just the upper Ram problem.
This ... was retested it shower upper ram failure at IC15 ,IC16 ,IC17 ,IC19 ... . So something had caused lower RAM failure this time What a useful ... -
doubt about swapping ULA in an issue 2 boardIs it possible to swap a 6C001E-6 ULA type with a 5C112E ? I have this issue 2 board that is not booting, it shows me a black border with horizont…
... but DiagROM gives me lower RAM errors, it says all lower ... RAM is faulty, or bad ... the 7805.
RAM IC's are MM5290N
I replaced just one RAM with a modded 4164 ( ... shows me an entire lower RAM failure.
I'm ... -
128K refurb.... What is the best way?Here's the latest Spectrum I got... Finally got a Toastrack... Not sure if it was good value ( around US$100 ). [img]https://os.blackice.com.au/us…
... seems to be doing the RAM test and hitting the infinite ... . Also I've replaced the ram and have gone from permanent ... to the oscilloscope suggest a RAM failure still, but I'm not ... -
Spectrum +3 not working [HELP]Hi, When i turn on my zx spectrum +3, im presented with a black screen with a solid green border all around it. Anyone here knows whats the meani…
[quote="Your Spec-chum;982380"]Ram failure of IC21[/quote]
There is no IC21...
RAM chips are IC3, 4, 5, and 6... -
Spectrum +3 not working [HELP]Hi, When i turn on my zx spectrum +3, im presented with a black screen with a solid green border all around it. Anyone here knows whats the meani…
... "][quote="Your Spec-chum;982380"]Ram failure of IC21[/quote]
RAM chips are IC3, 4, 5 ... . I still think this is ram fault though, although I haven ... -
Interesting 48K failureI thought I'd recount a failure I've not seen mentioned before that I saw tonight while fixing a 48K issue 6 board. The background: The initial fail…
...
The background: The initial failure was caused when a peripheral ... 1. A fault in upper RAM causing incorrect instructions to get ... from the Z80.
3. Intermittent ULA fault (easily testable - ... hypothesis:
5. Failure of TR6
Now ... -
Broken ram or what?Hi! I own ZX Spectrum 48K. When i run command PRINT PEEK 23732 + 256 * PEEK 23733, I should get answer 65535? But i get 49151. In my machine the upp…
... test program which can test ram. It also says that machine ... has broken ram. And if i remove upper ... is broken, where to find failure?
Thanks
Ippe -
Intermittent reset on 48K (issue 4S)I'be been fighting an intermittent selfreset the whole day. Changed ULA - did not help. Tested TR6 as i could and compared the reading with another…
I'be been fighting an intermittent selfreset the whole day.
< ... a short program. For example RAM test from the archive (which ... is in german). It runs RAM test okay. Nothing bad happens ... -
DIY Issue 1 Internal 32K RAM expansionFollowing on from the information in [URL="http://www.worldofspectrum.org/forums/showthread.php?t=40173"]this[/URL] thread, I finally figured this ou…
... of the Issue 1 internal RAM module.
The ... when the top 32K of RAM is addressed. Here's ... the machine saw 48K of RAM, verified with PRINT PEEK ... machine is seeing 48K of RAM now and that there ... The old girl has an intermittent colour fault, to be ... -
Strange INK behaviourThis weekend I hooked up two Sinclair ZX Spectrum with Interface 1 to try out the networking capabilities, and I ended up using parts of the Net Game…
... behave weird), or an intermittent failure in lower RAM (maybe affecting the system ... -
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 ... -
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…
...
I know that one RAM memory chip is out of ... here to set 16K of RAM so 32K are enough to ... -
RAM Music MachineBoxed RAM Music Machine Sampler (for 48K, Plus, 128K, Plus two) includes the tape, microphone, manual, even original mic stand! I last got this wor…
Boxed RAM Music Machine Sampler (for 48K, ... -
Boxed 32k Ram packPicked one up a few weeks ago at a car boot sale with a boxed 16k Speccy. Is the ram pack worth anything? Not seen any on Ebay. Thanks in advance, G…
Picked one up a few weeks ago at a car boot sale with a boxed 16k Speccy. Is the ram pack worth anything? Not seen any on Ebay.
Thanks in advance, Gnorman -
ZX-81 Ram Pack problemHi! I know this is a ZX Spectrum forum, but I am hoping someone here might be able to help me out... I have posted this to c.s.s. but noone was able…
... which is probably normal since ram
test takes a ... original
Sinclair ZX 16k ram pack issue 3 .
ram pack :
... a posibility of faulty RAM somewhere on the lower ... />
Also when no ram pack is present I can ... -
R Register, Contended RAM and ClonesHi. I've had a quick look at the CSS FAQ but didn't spot quite what I'm looking for (also the CSS FAQ doesn't have much detail of the clones - there …
... is the effect of contended RAM on the R-register? I ... run any code in contended RAM, but I do make several ... , but then without the contended RAM the HALT would take place ... -
RAM Test ROM?Found a link to this: [url]http://www.retroreview.com/iang/TestSpec4.zip[/url] in another thread, and fired it up in SPIN, but I have no clue how to…
... this to determine which physical RAM chip needs replacing, and/or ... -
256K RAM chips in Spectrum 128KSince I have lot of 256K RAM chips, and my 128K has RAM error, I think about replacing all 16 RAM (64K ones) chips with 256K chips. Then it would be …
... have lot of 256K RAM chips, and my 128K ... has RAM error, I think about ... replacing all 16 RAM (64K ones) chips with ... be 'Spectrum 512K' - something like RAM in Pentagon.
... bank switching of that extra RAM - we need 2 bits ...
