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spectrum PSU'sI've read contradictory info on which psu(ie amp rating) is for which spectrum. :confused: The models and amp ratings are 1.2A, 1.4, 1.85 and 48k, …
... and convert it into a lower, extremely stable voltage, at any ... go off to power the lower RAM block etc.
So ... -
Alternative chips for upper RAM blockDoes anybody know of a way to use 4464 chips instead of 4164 for the upper RAM block in a 48K machine? If not 4464 then something a little more avai…
... Eprom 27C128
and uper RAM with 62256 SRAM without any ... ROM socket. I also changed lower RAM with
2 x 4464 ... -
Alternative chips for upper RAM blockDoes anybody know of a way to use 4464 chips instead of 4164 for the upper RAM block in a 48K machine? If not 4464 then something a little more avai…
... Eprom 27C128
and uper RAM with 62256 SRAM without any ... ROM socket. I also changed lower RAM with
2 x 4464 ... -
Alternative chips for upper RAM blockDoes anybody know of a way to use 4464 chips instead of 4164 for the upper RAM block in a 48K machine? If not 4464 then something a little more avai…
... of 4164 for the upper RAM block in a 48K machine ... 4464s for both upper and lower RAM. The 4464 is a 4 ... 15) and have quadruple redundancy RAM...
If replacing a ... -
Alternative chips for upper RAM blockDoes anybody know of a way to use 4464 chips instead of 4164 for the upper RAM block in a 48K machine? If not 4464 then something a little more avai…
... for both upper and lower RAM. The 4464 is a ... 15) and have quadruple redundancy RAM...
If ... planning a daughterboard for RAM replacement and so as ... /> Old Amiga motherboards and RAM expansion cards could be a ... use the extra RAM as a RAM disk of sorts ... -
I want to build a new, super spectrum ;-)only kidding Andrew :-) my brain's going at a mile a minute at the moment, so I thought I should put some of the ideas down in case one of them is w…
... supply, which in turn kills lower RAM, which in turn can ... destroy other things if the lower RAM fails in an awkward ... . (Which in turn kills lower RAM. The TMS4116 datasheet says that ... daughterboards - one for lower RAM, one for upper RAM, which use a modern ... -
Speccy just snuffed it while playing 3D Pinball :(I have two speccys but the one I use most has just given up the gost! :-( game froze up and now all I get is flashing patterns and lines:-( Everyt…
... 've got a duff 4116 lower memory chip. If you have ... if it's dead upper RAM the Spectrum will still boot ... power supply can also kill lower RAM, and it's a really ... -
Speccy just snuffed it while playing 3D Pinball :(I have two speccys but the one I use most has just given up the gost! :-( game froze up and now all I get is flashing patterns and lines:-( Everyt…
... power supply can also kill lower RAM, and it's a really ... -
PC power source and Spectrums.I'm planning to use a basic PC ATX power source (300W) for all my sinclair equipment, but I have two questions: - I've read about some nasty things …
... because as you say, a lower RAM chip can go short and ... -
Broken SpectrumsChaps ( & Mrs Death ), I was looking at getting some dynamic ram chips for the next phase of the Harlequin stuff, and I started thinking...... I've…
... /> Getting hold of some dynamic ram for my harlequin/ULA replacement ... on a daughter board for lower RAM that uses easier to get ... -
Interface rom - Need help to dump itHi, I have temporarily an interface that is similar to a multiface. It has an NMI button and displays a menu where states can be saved and pokes ent…
... 'll be one or more lower RAM chips, the Z80 could be ... way, I'd be suspecting lower RAM (there are 8 of those ... . Then I'd start testing RAM. -
Interface rom - Need help to dump itHi, I have temporarily an interface that is similar to a multiface. It has an NMI button and displays a menu where states can be saved and pokes ent…
... 'll be one or more lower RAM chips, the Z80 could be ... way, I'd be suspecting lower RAM (there are 8 of those ... . Then I'd start testing RAM.[/QUOTE]
I am ... than you guys.
Lower ram appeared fine with Mr. W ... -
At the Carboot sale today.Today at the carboot sale I picked up An Acorn Electron -I see these all the time, An Official Branded BBC Micro Datacassete Recorder - I'v…
... died shortly after too (bad lower RAM). Before I repaired it, I ... -
At the Carboot sale today.Today at the carboot sale I picked up An Acorn Electron -I see these all the time, An Official Branded BBC Micro Datacassete Recorder - I'v…
... died shortly after too (bad lower RAM). Before I repaired it, I ... -
A question about HTML.Why did the W3C depreciate the align attribute of the <DIV> tag. What replaces it? Is alighnment purely at CSS level now. Scottie_UK.
... CSS to me. But my lower ram is faulty. :D ) -
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 ... -
4116 DRAM for 48KSomeone told me I got faulty RAM in my broken 48K. They should be 150ns, right? What would be a good place to buy them from?
I had the same problem (lower 16K memory bad) and tried ... has multiplexed address bus for lower RAM, so I connected an 8 ... ULA reads / writes to the lower RAM. Snow gone, normal operation 100 ... EPROM (if average current is lower)
* Replace +5 regulator ...
