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Troubleshooting RAM IC's on Spectrum +2 Grey?Got myself a grey +2 but at startup it shows something very similar to this: [img]https://preview.ibb.co/mmai5F/2_Ram_Fault.png[/img] I also su…
... also suspect there is a RAM fault but how can I ... but this time that is not happening.
What would be ... -
zx spectrum 48k issue 6A boot fail- black paperohh whats wrong with this poor specie .. boot fail,, border white & paper black .. when reset it shows the red lines to indicate that the CPU is cycl…
... card in all the ram passes.. but the contention ... about high frequency . the ram refresh tests reports a ... using a arduino which detected the 3.4 mhz ... CPU (interrupt request) it detected noting.. tried a known ... is data bus problem not addressing so unlightly to ... -
ZEsarUX 10.0ZEsarUX 10.0 is out! Download it from : https://github.com/chernandezba/zesarux/releases/tag/10.0 Changes: Version 10.0 - Clive Sinclair edi…
... machine" features: Automatic Snapshots to RAM + Rewind feature, backwards debugging, backwards ... customize charset
-Allow customize upper buttons to actions
-Real ... --help and --experthelp settings: do not parse configuration file when showing ... -
Paging for 64Kb of Video Ram??? What is the best way to page this?Hi all, I'm just putting together a concept card for a "Loki" style of video card, which supports shadow ( so it fits a normal Speccy ) and also t…
... single 48K video page with RAM relocated to the ROM space ... of memory and leave the upper 16K for a "Normal" video ... -
Spectrum Abuse...Just got some new Spectrums in to repair ( I find it a great way to relieve stress, excepting when I do something daft while fixing them... ) One …
... had a faulty lower-16 ram chip... Replaced and it was ... have no idea. It's not likely to break after all ... top of the board. Both upper board tracks were completely missing ... , no through plating left, no upper pad, no tracks. And what ... -
PAW questionThis may not be the right place but anyways there it goes: I've been trying to figure out how to import graphic files in .SCR format in the PAW parse…
... text.
Now, I'm not going to tell you how ... with PAW because I've not used it much. What I ... ; point to start of 16k RAM
LD B,A ; we ... /3 screens contained in the upper block of memory and then ... -
WANTED: tape replacement for +2?Any tape replacement possible for a +2? My +2 works wonderfully but the incorporated datacorder is simply worn out and won't load ANYTHING. Dirty sig…
... read from this port is not trivial, as can be seen ... /> For a correct test do not press any key while running ... 16K of RAM, and the processor with the upper 32K RAM and 16K ... -
TAP files for the TS 2068Hi, just recently bought a TS 2068 and found "Taper" on the web. Downloaded it and began to use it only to discover that it would not open TS 2068 fi…
... upper memory, or assumes BASIC starts at a specific address will NOT ... and the "OS RAM Routines" in lower RAM below the BASIC program ... program started much later in RAM, and why the maximum of ... free RAM was 38652 bytes, much less ... -
Great Fire Of London doesn't work!I've tried to load the TZX file of [I]Great Fire Of London[/I] into several emulators but so far I haven't had any success. The game starts loading, …
... "Flash loading" enabled does not yield an accurate result, because ... data straight into the virtual RAM of the emulated machine ( ... itself and/or some incorrectly detected encrypted block. I've come ... particular loading schemes that do not load, or even crash, ... -
Sparky eZX-BASIC Project in need of FPGA ExpertYou probably are not familiar with this project, but it is a computer system based on Zilog's new eZ80 chip and the OS is a superset of ZX BASIC. Ju…
... to the display. The display RAM could be shared on the ... the display chip.
Not much is mentioned about the ... , or to actually ignore the upper bits of the address bus ... even built in buffered display RAM interfaces for easy CPU implementation ... -
New Compo IdeaI've had this idea and would like to know what do you think about it. I think that most of us here know how to code in BASIC. The problem with Specc…
... VAL "n" or things like NOT PI for 0 or SGN ... POKE 23610,3. This would not work as any program line ... Basic system and generally should not be POKEd. However, some of ... -
Want a Speccy Repaired?Maybe it's time to put my 'skills' to use.... Now that I've sourced some of the nastier transistors, I've fixed about 6 rubber keyed Speccys in the …
... Z80 or dead lower 16K RAM.
If you mean just ... on the keyboard plate, and not necessarily the actual key, then ... 's basically working, though the upper 32K may still be duff. -
48k spectrum, video problems help neededHi All, I have been browsing this site for a long time and today i have finally registered and am after some help!! I have a 48k speccy and the vid…
... certainly.... It _might_ be your upper 32K RAM, but it's probably ... b) will be more costly (not massively) but at least you ... -
is my ZX Spectrum + finished :(When i turn it on the screen i get the usual gray border all around but in the screen area i get yellow and some orange lines with a black background…
... are the upper 32K which - even if they're not working - won ... .
It may well not [I]be[/I] IC7 at ... see if any of the RAM chips at all get warm ... -
broken ZX SpectrumHi there I was given a dead ZX Spectrum years ago, and being bored today thought I'd try it again. Its a Sinclair ZX Spectrum with lovely rubbery key…
... Spectrum's death: The upper 32K RAM bank had the D7 chip ... /> A meter will simply be not good. Lotsa realtime changes and ... there.
My dead RAM chip drained so much power ... -
What happens during a reset?I always used to wonder about this, but only thought a bit more about it last night when noticing after all these years what actually happens. Obvio…
... ARE 16BITS ,but the 'upper' part is not good.
SO they ... 8bits....
[/quote]
Not quite.
The faulty ... them make up the upper 32k of RAM in a 48k speccy ... you want to use the upper or lower 32k of the ... -
Why so many disk systems?Why did the Speccy have so many floppy disk systems like wafadrive, tr-dos, +3disk, and many more? As far as I can see, this did nothing but create …
... board was fully populated with RAM or not.[/QUOTE]
Ermmmm ... the motherboard. The extra 32K upper block was added as an ... -
Faulty 128KI digged out my Spectrum 128, and it wakes not up. I don't have experience, only with 48K. Maybe someone can give me some hint, clue. It looks like m…
... ago something similar, ROM for RAM testing. At this moment I ... in some RAM error cases?
I'm not in mood ... to desolder 16 RAM chip without beeing ... ) is from one of the upper 128K memory banks. It'll ... black if there's no upper bank. -
Game: the GEM machineHi all, I'm moving this game discussion from the Wanted: Game Ideas! thread to here, so we can concentrate on just the game. Any comments/suggestio…
... , only the bottom line is detected, the line is erased and ... bottom line without doing the upper line. IMO all lines should ... before its released.
Its not tricky to detect but it ... 3rd column.
Tricky, but not too difficult. ;-)
Thanks ... -
ZX Spectrum 16k by IskraHi everyone. I have posted the pics in some other thread... but it is HW related. Anyway, I have got a ZX 16k manufactured by ISKRA. It is in a box …
... Iskra on it (atleast not on the upper side - I haven't ... empty sockets for the 32k ram and control chips.
Election of the new maintainer of the TZX formatHi folks, the topic says all, let the discussion begin :) Luca
... lot of games that are not working with ZX Interface ... +2B because it used RAM disk up to such an ... that even the +3 RAM disk was slightly smaller and ... block, I still do not fully understand where's the ... to determine if the edge detected though the $FE port is ...Election of the new maintainer of the TZX formatHi folks, the topic says all, let the discussion begin :) Luca
... ]
SPIN does not support the hardware block, because ... />
No, it will not.
[quote]
RAM disk up to such ... that even the +3 RAM disk was slightly smaller ... determine if the edge detected though the $FE port ...48k one dead, one dodgyhello everyone. I have 2 48k spectrum +'s (the one with the QL case). Both boards have issue 3B on them near the speaker. The first will power up …
... a row. These are 4116 RAM chips. What numbers etc are ... chips and make up your upper 32K block. They probaby won ... sockets, bought brand new or not, I would say it's ... in the day. That's not to say there's anything ...Spectrum Issue two problemI managed to bring back to life a issue two spectrum (at least the power supply cirquit). The screen is now crystal clear (after replacing all the el…
... have anything that is NOT red-on-black dots ... Spectrum that had a fried upper-bank chip drawing so much ... a thing. I replaced the upper-bank chip (was a ... since the CPU would not even test RAM) or even the EPROM ... the lower eight 16Kx1 RAM chips with a single ...problem with sinclair zx 48 issue 6aHi all, I have the following problem when I turn on my sinclair without rom inserted. [url]http://217.79.64.145/sinclair/5.jpg[/url] when I turn o…
... a dead 32Kbit OKI Ram Chip in the upper bank. I replaced ... , sorry.
I'm NOT telling you to replace the ... /> If you're lucky (or not?) you will find a line ...problem with sinclair zx 48 issue 6aHi all, I have the following problem when I turn on my sinclair without rom inserted. [url]http://217.79.64.145/sinclair/5.jpg[/url] when I turn o…
... not have access to a scope
I removed all upper chips ... too and place sockets for ram and try use new ramchips ...TV Modulator. Can it be repaired?Is it possible, to repair tha TV modulator (after removing it) if it gives wavy picture? I replaced both transistors (tr1/2) and both electrolytic ca…
Won't initialize above 16K RAM - well, either A15 on ... the chip select for the upper 32K is fried. It' ... certainly a problem with A15 not getting to the parts ... between the lower 32K and upper 32K based on the state ... logic analyzer but I've not found one that's ...
