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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] -
ZX Spectrum Issue 4S composite video fuzzy (horizontal blur)Dear people of WoS, Thank you very much for taking the time to read. I have an Issue 4S I recently acquired and planned to fix up as a gift for a…
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Test RAM with Brendan Alford's "ZX Spectrum Diagnostics"
Exchange ... -
+2 crashes upon pressing some keysYears ago I purchased off ebay a mint condition, Dixons special offer boxed UK-made issue 1 +2. I did not use it so much until recently however, focu…
... programs for the ULA and RAM, first [url="http://www.users ... ="https://github.com/brendanalford/zx-diagnostics/wiki/Tape-Tests"]this[/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 ... -
Fixing a poorly Issue 3 - Odd faults.Here's one for you Spectrum fixers, I warn you it's a long one. I've spent a couple hours this evening doing several repairs on a rubber keyed Speccy…
... the 2 previously replaced lower ram IC's as suspected faulty ... started working, and the lower ram test reported IC13 as suspected ... problems were still present. The diagnostics reported IC13 still as faulty ... over where the previous lower ram IC's were replaced, ... -
Winston's 25th anniversary Diagnostics BoardBack then, I created the board, but still wanted to build a new one based on a professional PCB, which are more affordable these days. There was some…
... ="https://github.com/brendanalford/zx-diagnostics/tree/master/hardware"]this repository ... -
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 ... -
boot fail .. bad address lines A7,A12,A13anybody have any ideas what could be wrong with this specie issue 3B .. work done : removed rom, upper ram & logic put lower ram multiplexers in sock…
... removed rom, upper ram & logic put lower ram multiplexers in sockets ... & ic4) , put lower ram in sockets, full recap, fitted ... still no boot,tried regular ram...checked all the data & ... different external rom ie zx diagnostics, or ,paul fellow program ... -
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. -
Anybody fancy coding this?blah de blah de blah Please ignore, poting error.
... topic, while making my Spectrum Diagnostics board, I've run into ... -world memory failures with 4116 RAM.
One thing to ... -
BooHoo....Broken Speccy on 25th anniversary!Speccy broke today (today of all days!!) I'm presented with black screen on power up, anybody any ideas what might have gone wrong and any repair ti…
... certainly a bad 4116 lower RAM chip.
Repair means ... 4116 is actually bad. (My diagnostics board is designed to sniff ... -
48K Speccy not workingHey, A few months ago (hope it´s not to late) I was loading a game into my speccy and from one moment to another it stopped working! I unplugge…
... I'd plug in my Diagnostics Board and see what it ... of one of the 4116 RAM chips.
Then test the ... 'd change out the 4116 RAM for known good memory. -
InterfaceHi I'm building a spectrum emulator. I've tried to build it as modular as possible, for example I have a zx class that have input and output devices…
... a Spectrum (both ROM and RAM) has what are known as ... 32K bank (the way the RAM gets selected is slightly different ... -
How about making a diagnostic program for 128k speccys?Hi guys, I was just chatting with DEATH today about a problem i had with my 128 heatsink spectrum and the need for a 128k speccy diagnostic program …
... in test for the entire RAM. If any of it fails ... />
If you need further diagnostics -- there is an Amstrad diagnostic ... -
The direct bus or indirect one... that is the questionThe Ethernet project continues...and I'm in a quandry. So I've managed to implement enough socket library for the W5100 that socket, bind, listen, a…
... in the Spectrum's main RAM. Given the single cored nature ... socket library ROM page and RAM workspace. A15 held high to ... " things).
Also, a diagnostics program that listens on a ... -
Black ScreenHi, Anyone know what would cause a 48k Spectrum to boot to a black screen? you can hear the internals buzzing at power up, but you just get a black…
... black screen as the RAM defaults to zero.[/QUOTE]< ... br />
The RAM defaults to a fairly random ... vomit' on turn on). RAM is cleared down to zero ... br />
If the RAM is faulty, it depends how ... RAM to find out which one's gone (see the diagnostics ... -
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…
... 's diagnostics board would soon tell if the Z80/RAM was ok ... -
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…
... (the 4116 RAM) has failed. If you have my diagnostics board, you ... -
+3 dead(!)Hi, When I turn on my +3 I see only white and black strips (vertical) on screen any idea on how to fix it? Thank you in advance Chris [IMG]http:…
... color indicating which bank of RAM being damaged, but I'm ... . Then touch each RAM chip. A bad RAM chip uses to be ... in it to perform some diagnostics on the board.
Sinclair ZXC3 FLASH ROM CartridgeI recently received mail about the new ZXC3 PCB which provides the unique ability to program it directly from the Spectrum without the need for an EP…
... AND the ram turbo interface. If zaxon made the diagnostics thing or ...Some ROM/EPROM questions...I've got a ZX Spectrum +, a +2A and +3 computers, and I've been using +3e project ROMS for a while in my +3. I was thinking about using an EEPROM or…
... too wrong building winston's diagnostics board. I have hacked one ... . It has 512K of flash ram arranged as 32x16K which can ...Flash based rom replacement board for +2A/+3I'm sure I already started a thread about this, but I can't find it... Anyway, this post's to say that I've just sent off the order for the printed …
... , this will help) both the diagnostics board project and the Spectranet ... .e. anything you write to ram there is also written to ... />
this means that the ram from 0x8000 to 0xBFFF is ... used, as anything in that ram area will get overwritten by ...ZX Spectrum +3 Query...Hi all, As common, I brought down my Spectrum from the attic the other day to have another stab at getting it running. I knew from the past it was a…
... be a CPU/ULA/ROM/RAM fault.
I remember ... WoS something about a small diagnostics adapter that plugs onto the ...
