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Colour blocks on displayHi all, I have just acquired another Sinclair product, my first one being a C5, it's a 48K ZX Spectrum. It shows colour blocks on the display when p…
... /> C46=9.6V
Lower memory bank;
IC6 pin 1 ... -
Colour blocks on displayHi all, I have just acquired another Sinclair product, my first one being a C5, it's a 48K ZX Spectrum. It shows colour blocks on the display when p…
... />
[QUOTE=kamilb1998;601859]
Lower memory bank;
IC6 pin 1 ... ULA is /CAS for the lower RAM and attaching a voltmeter ... the power supply from the lower RAM, either by cutting the ... -
Colour blocks on displayHi all, I have just acquired another Sinclair product, my first one being a C5, it's a 48K ZX Spectrum. It shows colour blocks on the display when p…
... for the rest of the lower memory chips.
The resistance ... right in thinking that the lower memory chips appear to be fine ... -
4116 SRAM replacement (and ULA timings).As mentioned in another thread, I have spent quite a lot of time experimenting with different circuits and components for using a static RAM IC to re…
... .php/simm-adapter-for-replacing-lower-memory[/url]
Read it ... -
ZX Spectrum not working... issue 4S?Hi, I've bought a "new" broken ZX Spectrum +. The idea was to put an harlequin board inside, but for the moment I'm trying to put it in working order…
[QUOTE=Zup;604512]
- Lower memory chips doesn't only have + ... /> - Are there any chance that lower memory is still fine or I ... some 4116s?
- Is upper memory more resistant or it will ... -
ZX Spectrum not working... issue 4S?Hi, I've bought a "new" broken ZX Spectrum +. The idea was to put an harlequin board inside, but for the moment I'm trying to put it in working order…
... the caps, chances are some lower memory is also at fault too ... -
New project: CargandoLeches. Ultraloads with ROMHi This project has started months ago, between decicoder, macleod and me. Uses the best modulation of k7zx (throwing shavings). But this ultraloa…
... paging that allows RAM in lower memory (so it works by emulating ... page in external DIVIDE PLUS memory 512kB.
If you need ... -
4116 SRAM replacement (and ULA timings).As mentioned in another thread, I have spent quite a lot of time experimenting with different circuits and components for using a static RAM IC to re…
... trying to use a SIMM memory module to replace 4116 DRAM ... .php/simm-adapter-for-replacing-lower-memory/12-a-direct-wired-prototype ... -
48k Speccy chucks a wobblerI've got a problem with my rubber keyed 48k speccy. When it is first switched on everything is fine but after a couple of minutes the picture on scr…
... as if the contents of lower memory are becoming corrupted. Once the ... /> The problem could be the lower RAM ICs themselves, though usually ... switching transistors and consequently the lower RAM too. If this Spectrum ... -
Difficult to find upper RAM fault.I've recently repaired an issue 3B 48K Spectrum that had a tricky to diagnose upper RAM fault, so I thought I'd post a report of what I found here. …
... , this ROM doesn't use lower memory at all (except for image ... can boot a Spectrum with lower RAM bad chips. System variables ... -
My Issue 2 spectrum"IT'S ALIVE!!!!!" - Dr Frankenstein I got my issue 2 spectrum up and running, colours and all. I borrowed socketed lower ram from my issue 3 that is…
... /> As soon as I get lower memory modules from Bverstee, I will ... -
48k+ CPU SocketThink I've bitten off more than I can chew... After the desoldering my z80 went without incident, no damaged pads, tracks etc. I expected the socket…
... Blow
2. 4116's (lower ram) go bad
2 ... />
Check your voltages on lower memory. -
4116 replaced by 4164 - "Noisy" paper?After I replaced my 4116's with 4164's and hooked them up to +5V, disconnected -5V and +12V, I have what looks like vertical lines in the paper, like…
... output impedance of the 4164 memory compared to the 4116. Similar ... is sufficiently low (or upper memory's output impedance is sufficiently ... will cause CPU writes to lower memory and the ULA fail (and ... said that, proper functioning 4164 memory shouldn't do this, ... -
Replacing Upper RAM in 48KHi Folks Well, my fun continues :) After sorting the display issues with this machine I found I couldn't load software meant for 48K machines. Havin…
... use it to repair the lower memory and then use the upgrade ... -
New Spectrum +2 owner, got problems!Hi everyone, I'm new to the Spectrum scene having grown up a C64 user, I was offered a Spectrum +2a for ?20 with no software. I decided since the div…
... next place to look is memory problems. However, if the Speccy ... no DivIDE connected at all) lower memory is probably working fine (which ... course doesn't rule out memory problems - there are types of ... memory faults that will allow the ... -
Issue 2 problemHeres a video of what happens when I fire up an Issue 2 board ive had hanging around for ages, this is with Paul Farrows RAM test cart in btw If this…
I checked the supply voltages, all within range, now then, which lower memory to start with, sods law if I work from left to right it will be the one furthest to the right and vice vera! lol -
What games benifit from having a faster spectrum?I'm using Spectaulator atm and have been playing around with the mhz slider. Could real Spectrums be added to or altered to act this way? Could the…
ZX Spectrum and Interface 1 microdrive connectorsI think the following is correct: IF1 microdrive connectors are 8pin (slot 3 notched) 2.54mm pitch and Speccy Expansion Bus is 28 pin (position …
... the internal power supply and lower memory on a 48K Spectrum!The "best" Z80?What's the best Z80 for Spectrums? I know there are differences between brands (Nec, Zilog, Thomson) and technologies (CMOS, NMOS), so what Z80 woul…
... Z80 is quite a bit lower (especially for logic 1 signals ... Z80 writes instead of the lower memory it is trying to read ...SAM Coupe - a video problemHi mates. Lately I managed to acquire a SAM Coupe 512K. There are, however, certain problems that - I thought - You might help me with, in a mome…
... one or both of the lower DRAM is faulty. If it ... use any of it's memory for the video display, so ... if the SAM then uses lower memory for video.
Also ...X128 and EMS memoryI installed x128 emulator (latest v0.94 build) on my old notebook Intel P1 266MHz MMX, but I have one problem. It seems that the x128 is very sensiti…
... some aplication that requires ems memory.
After that crashed again ... needs a RAM "window" at lower memory between segments E000-EFFF. In ...48k + Spectrum Issue 4S Display IssueHi all! Brand new user here. Growing up I had a zx spectrum for a little bit, and recently I have bought a working 48k + Spectrum (Issue 4). I was…
... valid data patterns. But the memory cells aren't there and ... things while there is no memory, and is senselessly (and ... address occupation 'passes' the screen memory area about every second.
lower memory data lines. I find it ...48k + Spectrum Issue 4S Display IssueHi all! Brand new user here. Growing up I had a zx spectrum for a little bit, and recently I have bought a working 48k + Spectrum (Issue 4). I was…
... valid data patterns. But the memory cells aren't there and ... things while there is no memory, and is senselessly (and ... address occupation 'passes' the screen memory area about every second.
lower memory data lines. I find it ...Issue 3 board... How to resurrect?Dear Everyone, Now I have a working 48k Issue 3, a sort of working Speccy+ (still having problems with the keyboard, more of that in another post) a…
... TTL, CMOS, EPROM, ROM and memory devices.
The first ... by taking out the upper memory chips and the support chips ... are working.
The lower memory can also be the root ...Which ULA?Just a quick question, more of interest rather than immediate need... I am thinking ahead about the repair of an Issue 2 board, and also an Issue 6A …
... Membrane and z80 with confidence, lower RAM with less. I suspect ... a stack of Zorn's replacement Lower RAM boards in the near ... anywhere. However, none of the lower RAM chips are heating up ...Poorly Issue One 16k spectrum diagnosis?Hello, everyone. :smile: I was lucky enough to buy an Issue One 16k rubber key the other week; I didn't know it was an Issue One till I opened it up…
I'm wondering if it's one of the lower RAM ceramic caps (C1 to C8 ) at fault? That vertical line didn't look to be present when the replacement lower RAM module was in place...
Replacements are 47nf, 25V I believe.
BSpectrum Serial Numbers Wanted!![b]This post updated Sept. 26, 2013[/b] As far as I know, the serial numbering system for the Spectrum has never been fully worked out. For the p…
... 'd put money on a replacement lower half and a redrilled adjustment ...Corrupt paper on zx spectrum 48kHi. When I power up my spectrum (issue 3) I get the light grey border, but the paper is black and it switches between thin red vertical lines and thi…
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But I think the memory is interleaved, so I'm ... put in half to the lower memory bank and see if it ...INTERFACE 2 - light versionSmall interface (adapter) compatible with INTERFACE 2. Contain only slot for IF2 cartridges and reset button (for rubber speccy). Not contain joystic…
... with different functionality (ZX128 rom replacement, external memory upgrade for ZX16, MB02 ... memory, D/A converters, etc... All ...
