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Spectrum 48k won't start any software but passes all RAM testsI have a rubber key 48k which will not start any software - it appears to work perfectly right up until the end of the tape and the program would sta…
... a problem with the upper RAM however on running the soak ... minutes. I also performed the RAM test detailed here http://www ... longer or look for non-RAM related issues? -
Creating a POK from RAM or binary.Don't know if this is the right category or not but here goes. I'm working on a bug fix for a game, it's a few hundred bytes worth of custom code …
... said file from a set RAM location or a binary? I ... -
Spectrum 48+ 4S - Upper RAM issue, and now a self-created problem!I recently picked up a known-flaky spectrum off eBay, to have a bit of fun fixing it and reliving youth. It was labelled as 'keyboard duff, shows…
... tape version of Balford's ram test diagnostics said the whole ... of upper RAM was faulty (check all ICs ... 've removed all the upper RAM ICs, replaced with sockets and ... .
Given the lower RAM used to be okay, and ... -
zx.zigg.net lower RAM replacement module: Still shipping?Hi everyone I'm trying to resuscitate my 48k issue 6a, and I bought the lower RAM replacement module from zx.zigg.net. The paypal payment went thr…
... , and I bought the lower RAM replacement module from zx.zigg ... -
RAM questionI've been meaning to upgrade my desktop pc's ram for ages now as the 4GB it has isn't cutting it anymore but im confused about what ram my motherboar…
... my desktop pc's ram for ages now as ... but im confused about what ram my motherboard will support.< ...
The motherboard has 4 ram slots 1 taken by the ... i dont know what ram is compatible and what ...
in its ram section for the motherboard but ... -
ZX81 Ram pack problemI got recently Sinclair 16k memory expansion for my ZX81, but for some reason it will not work. The computer itself is operating normally without hi…
... years.
Of course, maybe ram pack is faulty, but it ... -
48k Speccy with Ram Turbo, Dust Cover and a couple of games!I'm selling one of my Spectrums on Ebay, and along with it a dust cover, a Ram Turbo Interface for cartridges and joysticks and a couple of Codemaste…
... it a dust cover, a Ram Turbo Interface for cartridges and ... -
ZX Spectrum+ showing 16K of RAMHello again, as the title says my ZX Spectrum+ is showing only 16K of RAM instead of 48K when running a memory check. [url="http://www.1000bit.it/su…
... + is showing only 16K of RAM instead of 48K when running ... how to identify the faulty RAM chip, but I seriously have ... -
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 ... -
Lower & upper ram IC's for an issue 3 please.Would any of you great folks have 1 spare lower ram, and 1 spare upper ram IC's you would be willing to sell. I'm fixing up a poorly Spectrum that is…
... 1 spare lower ram, and 1 spare upper ram IC's you ... -
Replacing lower RAM 4116 ZX Spectrum 48k - desoldering advice please?A long post, but interesting pictures perhaps. :) I'd like some advice: (also apologies I think I picked the wrong 'Hardware' category for this, plea…
... seemed to indicate a lower RAM issue. It hadn't been ... -
Third-party ZX81 RAM packsOne of the things that's previously held me back from fishing for a ZX81 on eBay - other than "will the ULA on this machine sold as 'untested' be com…
... getting hold of a 16K RAM pack. Now, even back in ... of the existence of other RAM packs that weren't the ... (at least try to) eliminate RAM pack wobble, but then there ... time it had a working RAM pack I was [i]five ... -
MGT Sam Coupe BIG JOBLOT!!! 22 Disks, 3 manuals, 1MB Ram Expansion + Midi Cable!Direclty from my personal Sinclair collection that never end... ...MGT Sam Coupe BIG JOBLOT!!! 22 Disks, 3 manuals, 1MB Ram Expansion + Midi Cable…
Direclty from my personal Sinclair collection that never end...
...MGT Sam Coupe BIG JOBLOT!!! 22 Disks, 3 manuals, 1MB Ram Expansion + Midi Cable!
https://www.ebay.co.uk/itm/173022113295
Have a nice bid ;) -
Testing ram memory of DivIDE / DivMMCHere is new utility for testing DivXXX ram memory: [url="http://velesoft.speccy.cz/zx/divide/software/divramka.zip"]velesoft.speccy.cz/zx/divide/sof…
Here is new utility for testing DivXXX ram memory:
[url="http://velesoft.speccy.cz/zx/divide/software/divramka.zip"]velesoft.speccy.cz/zx/divide/software/divramka.zip[/url] -
sam coupe with external 1mb ramvelesofts site has snaper disks: https://velesoft.speccy.cz/sam_zx128.htm when you use masterdos to detect the external 1mb of ram interface th…
... detect the external 1mb of ram interface then the snaper emulator ... lets you select the fast ram and the zx spectrum game ... uses this ram above 32768 this gives you ... -
Sinclair 16k Ram pAck Issue3 schematicsHi guys, I am willing to repair a 16k ram pack for the ZX81 but I cannot find any schematic of the ISSUE 3 ram pack. I could only find a schematic…
... willing to repair a 16k ram pack for the ZX81 but ... schematic of the ISSUE 3 ram pack. I could only find ... and replace them with 8118 ram which requires only +5V. Problem ... desoldering one of the 4116 ram, I lifted the tiny little ... -
48K Issue 2 RAM issuesI have 48K issue 2 board (I've checked, the upper memory is present!). It's not very well. I've not attempted to diagnose one before, so please bear …
... are only in the upper RAM as it will actually boot ... -
The Complete List Of The Causes Of Lower Ram Failure?Well the aim is to get a comprehensive list.I ask this because I know very little about it . I know that failure of "power supply" related capacitors…
Well the aim is to get a comprehensive list.I ask this because I know very little about it . I know that failure of "power supply" related capacitors can do this . But I suspect there are loads of other ways to damage lower RAM ICs? Any ideas? -
upper ram tacks / TR4 socket...[url="https://photos.app.goo.gl/MkqzRCuNCV3EPr9E7"]https://photos.app.goo.gl/MkqzRCuNCV3EPr9E7[/url] you can only replace that pesky TR4 so many t…
... would just fry the lower ram again .. this is one board ... like somebody attacked the upper ram with a black and decker ... sugestions for replacing the upper ram tracks ? -
zx spectrum display corruption .. with lower ram module installed[img]https://photos.app.goo.gl/Gu6rjC5v21sZxwTX9[/img] [img]https://photos.app.goo.gl/FznVw8SkbbhWn5mh7[/img] another specie question : i have …
... video corruption, it has lower ram module fitted.. can get it ... it shows lower ram as good and upper ram not detected although ... start digging at the upper ram, or the 4 logic chips ... that drive the upper ram.. i am presuming that one ... -
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 ... -
Built a ZX Spectrum that works, but can't get the upper RAM to work?Like the title says I finished my Spectrum 3B board, and it boots, but it doesn't see the upper 32k of RAM. When it boots, the lower 16k works f…
... see the upper 32k of RAM.
When it boots ... programs and even run a RAM diagnostic. Basically, tells me that ... all the associated logic, and RAM chips, with no effect. I ... direct connections between the upper RAM and associated logic, and I ... -
Max RAM for ZX Spectrum gamesHow much RAM can be used for single level/whole game? On tape writing.
How much RAM can be used for single level/whole game?
On tape writing. -
The 128 plus 2 wasn't very goodHaving looked at the review in issue 33 of Crash of the Spectrum Plus 2, it strikes me as a bit odd, as if Simon Goodwin had to like it. I remember r…
... arithmetic when accessing the video ram for vertical scroll, with a ... it requires a faster ULA, RAM and CPU. Contention wouldn't ... than eliminate contention by alternating RAM access. For double speed, ... in my 1983 ts2068 were 150ns DRAMs; two years later they ... -
Wanted 10 - 4116 Ram ChipsHi Can any one help I am trying to get hold of 10 4116 RAM chips for a 48K Spectrum. Does any one know who might stock them. I can get a minimum of …
... :
"4116 - Dynamic RAM NMOS 16kx1 150nS 16-pin"
or
"4116 - Dynamic RAM ... /> They also have "4164" (Dynamic RAM NMOS 64kx1) in versions from ... -
Wanted 10 - 4116 Ram ChipsHi Can any one help I am trying to get hold of 10 4116 RAM chips for a 48K Spectrum. Does any one know who might stock them. I can get a minimum of …
... :
"4116 - Dynamic RAM NMOS 16kx1 150nS 16-pin"
or
"4116 - Dynamic RAM ... /> They also have "4164" (Dynamic RAM NMOS 64kx1) in versions from ... -
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…
... in every location in upper RAM - so it's half ...
You mention the RAM was checked in other machines ... reading does not know, RAM access time is usually ... stamped right after the RAM part number, generally after ... a HM4864AP-15 is a 150ns DRAM, but a TMM2016P1- ... -
memory chips spectrum +Hi with regards to memory chips the ones in there are tms4116 in the lower memory.there is some on ebay MCM4116BP20 can i mix these with tms ones or …
... /416-3/MN5290-2 4116 150ns
You put ... ://cgi.ebay.co.uk/VINTAGE-RAM-MK4116N-3GP-MOSTEK-16PIN-DIP ... UPD416-3 chips is a 150ns :-O
bye
