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Who has an Issue 1 or Issue 2 Spectrum??Do you have an Issue 1 or 2 Spectrum (ie machines with 5C102E and 5C112E ULA's) ??? You're help is needed! PLEASE SEE THIS THREAD: [url]http://www.…
... meet - with interrupts disabled, the lower RAM will not get refreshed between ... -
Who has an Issue 1 or Issue 2 Spectrum??Do you have an Issue 1 or 2 Spectrum (ie machines with 5C102E and 5C112E ULA's) ??? You're help is needed! PLEASE SEE THIS THREAD: [url]http://www.…
... lines indicates that *none* of lower RAM is working - check the +5 ... GND connections to the 4116 RAM first. It wouldn't be ... -
Free speccyAnyone want a speccy plus with leads and psu for free? I was going to do the comp mod on it so pulled it out to run it up before i started and it's d…
I can pay you postage if you take PayPal (or send you a cheque). It's probably just bad lower RAM, I have plenty of spares. PM me if you don't get an better offers! But nooooooo not the bin! -
Merry Christmas WossersJust thought I'd say it, although it might be alcohol induced, lol
... switch mode power supply and lower RAM... -
Free speccyAnyone want a speccy plus with leads and psu for free? I was going to do the comp mod on it so pulled it out to run it up before i started and it's d…
... to be a problem with lower RAM - but the bizarre thing is ... be an artifact of how lower RAM has failed; the diags board ... the way through (showing a lower RAM problem), and even run the ... -
another c64 vs. Speccy site...[url]http://c64vsspectrum.com/[/url] 25 years and we are still brawling.. ;)
... really be pushing the RAM that was available at ... ULA needing to access RAM eight times more frequently ... be able to access lower RAM while the scanline was ... 3.
Arranging RAM as you suggest would be ... have cheap 10ns static RAM and 7ns CPLDs that ... -
DRAM (:baffled:)Hi, Can someone explain to me the definitive rules on DRAM access times in terms of suitability for a particular speed of processor? Specifically, …
I replaced 8x16K chips (video RAM) with 2x4x16K chips in 48K ... Speccy. Replaced too upper 32K RAM with one 32K SRAM chip ... was piece of cake, but lower RAM (what is DRAM because of ... -
DRAM (:baffled:)Hi, Can someone explain to me the definitive rules on DRAM access times in terms of suitability for a particular speed of processor? Specifically, …
... the maximum refresh time for lower RAM - which is refreshed by the ... be too *fast* for faster RAM though. Perusal of the datasheet ... -
Problem with the video hardware?Hi there. I'm an 8-bits collector and I've just bought a Spectrum 48K. I'm not sure if it's working, I don't get a proper image on channel 36 on tell…
... internal power supply). Quite often lower RAM has gone bad. -
Spectrum 48K input voltageI have a power supply that is rated 9,5 Volts DC. With no load it outputs about 9,86 Volts. Is it safe to use it for ZX Spectrum 48K? (it can do …
... possible to damage the 4116 lower RAM chips by underpowering them on ... -
broken ZX 48K, help neededI have a broken down ZX 48K :cry: The keyboard membrane is almost completely destroyed, and this is what screen shows on power-on: [IMG]http://www.h…
Most likely cause - RAM in the lower 16k has gone bad.
< ... , check the voltages to the lower RAM (4116). Make sure the +5v ... internal power supply or the lower RAM (if the internal power supply ... failed it will kill the lower RAM). -
Can you see the Spectrum......in this auction? [url]http://cgi.ebay.de/ZX-Spectrum_W0QQitemZ160246792691QQcmdZViewItem?hash=item160246792691&_trkparms=72%3A445%7C39%3A1%7C65%3…
... like pinkish resistors) for the lower RAM chips, I'd bet on ... -
Custom SAVE Routine work on emulators?Hi, I'm developing a SAVE routine derived from the one present in ROM 48K, and I'm trying to get it work on several emulators (X128, Spectaculator, …
... takes priority on reading the lower RAM over the CPU. -
Another badly behaved RAM upgradeI have a 48K issue 4A board (yellow it is) that was a 48K machine from new, but only reports 16K working with the Sinclair ZX Test ROM in an Int2. H…
The RAM in a 48k machine is ... if that was the case, lower RAM would fail too. You could ... -
Jetpac questionHi all, I just bought a copy of Jetpac off of Ebay and I'm having problems. To start, I'm trying to play it on an issue 2 Speccy with Interface 1, 2 …
... failure modes of Spectrum RAM with that test. I ... at least for the 4116 lower RAM) the most common failure ... for bit fade, once RAM has passed the inversion ... fill tests, set the RAM for an inversion pattern, ... passes, the lower 16K for the 4116 RAM, and the ... -
R.I.P. spectrum 48kRecently one of my 48k rubber key (issue 4) machine bit the dust the other day when I tried to power it on. When powering it on, it gave a weird 'bee…
... would suggest it's a lower RAM failure, but it could be ... -
R.I.P. spectrum 48kRecently one of my 48k rubber key (issue 4) machine bit the dust the other day when I tried to power it on. When powering it on, it gave a weird 'bee…
... this one...bet it's lower RAM going faulty. This seems to ... -
R.I.P. spectrum 48kRecently one of my 48k rubber key (issue 4) machine bit the dust the other day when I tried to power it on. When powering it on, it gave a weird 'bee…
... this one...bet it's lower RAM going faulty.
.... swap chips ... voltages before (even try) swapping lower RAM!!!
[QUOTE=Winston;334096 ... -
issue 6a faultyHi All I got issue 6a pcb from ebay with status faulty pcb had bad voltages when I power up I changed tr4 ztx650 and all voltages got back on ic6 I h…
... screen data coming from the lower RAM to the ULA. When the ... -
issue 4s for reapirHi All, This time I have issue 4s for repair :) Here is few screen shots and small movie after boot. [url]http://forest.no-ip.org/issue4s/[/url] I kn…
... have sockets for cpu and lower ram :)
result pictures here [url ... -
Trouble with Spectrum 48kI think it is a Rev 3 (Issue 3 on the motherboard). The screen has weird characters, instead of text, and the keyboard is not responding (although it…
... it's a problem with lower RAM. This is the most usual ... -
Two dead SpectrumsHi all, Long time since I posted on here. I'm having a bit of a clear-out, and I've re-discovered two Spectrums I had in the loft : One is an orig…
... almost always means the lower 16K of RAM is dead. 4116 memory ... functioning - this will kill lower RAM too because lower RAM needs -5v supplying before ... -
dead issue 6a boardI've just been back to the uk and found my old 48K + there - and bought it back with me to singapore - it's giving white border and red bars. From wh…
many thanks for the quick reply. The pwr supply is fine so i guess its one of the lower ram chips. -
dead issue 6a boardI've just been back to the uk and found my old 48K + there - and bought it back with me to singapore - it's giving white border and red bars. From wh…
... have tested resistances on the ram chips, and am not convinced ... (pin 2 on all the lower ram chips is showing 7K or ... -
Diagnosing Spectrum 48k (faulty RAM chip?)I have a Spectrum 48k (I believe it may be an upgraded 16k model) that doesn't work, and never has ever since the owner gave it to me. When you turn …
... meter.
Without -5V the lower RAM will 'depart' very soon, getting ... -
using ic/chip holders ?advisable or not to put them in an original spectrum? I mean to save soldering in the future, if I'm gonna be having the machine fixed. I saw them …
... .
I guessed the lower ram would be fine to do ... -
using ic/chip holders ?advisable or not to put them in an original spectrum? I mean to save soldering in the future, if I'm gonna be having the machine fixed. I saw them …
... half of the lower RAM, test, then rest of lower RAM (and test).
faulty zxspectrum +hi all i just bought a speccy 48k+ off ebay it worked for like 15 mins now it is stuck on the reset screen. I fear this is something major maybe fau…
Whenever that's happened to a machine of mine, it's always been one or more lower RAM chips failing.faulty zxspectrum +hi all i just bought a speccy 48k+ off ebay it worked for like 15 mins now it is stuck on the reset screen. I fear this is something major maybe fau…
... find out if its a lower ram chip are there similar threads ...just thinking about ...compo for zx 16k ? anyone ?
... Contention Competition, since all the lower RAM is contended. Don't see ... of ULAplus is that the RAM requirement is no bigger than ...
