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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. -
ObituaryYesterday my spectrum died :( Over 7 years of faithful service its finally gone to Silicon heaven. Rest in peace spectrum 48k+ Born sometime in 198…
Still, it *might* be that there's a power failure someplace... who knows, perhaps CPU, ULA, ROM and RAM are ok.
I suggest you don't dispose of it in ANY case, since it might come in handy for spares! -
Spectrum problemHi I've just been trying to resurrect my 48k spectrum. I'm having some problems loading some of my games, but if it does completely load, it crashe…
... NEXT i
100 PRINT "Ram checked OK"
110 GOTO ... keep testing out the upper RAM once every 10-15 mins ... it will repeat - when a failure is found, it'll print ... -
Fire Ruby - More HelpI cant pass the spikes in the fire ruby by lawrence creighton, can someone please help? [ This Message was edited by: welsh_brawler on 2003-08-08 21…
... 51
HAMM 52
RAM 53
EMPT 54
RAM SAVE RL...RAM LOAD{6}{6}{6 ... }{5}your search a dismal failure.{6}{6}{6}
OopsToday is a sad day :confused: Poor old rubber keys has gone t**s up. :( All i get is a black screen with a white border. Any body got any ideas …
... faults are failure of the -5v supply, faulty 4116 RAM (lower 16k ... ), faulty ULA, faulty upper RAM (4532 32k) and faulty CPU ...ArmalyteWas just browsing through some old YS stuff, and remembered the playable demo of this. Just got it and had a go from the archive. It's actually a ver…
... RAM configurations. That alone probably would've ensured it was a failure ...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…
This is what I've compiled so far:
[quote]Resources
=========
* Make all caps
---------------
You can turn CAPS LOCK on or off using a simple poke to 23658:
POKE 23658,8: REM CAPS ON
..."Sinclair Zx Spectrum: Absolutely Better Than Commodore 64"Did you ever read this? [url="http://www.alfonsomartone.itb.it/fztsmo.html"]http://www.alfonsomartone.itb.it/fztsmo.html[/url]
... different controller chip) The video-RAM in the 128D was increased ... to 64K.
The failure of the 128 series is ...Speccy MTBFHi, Looking at the old (issue 1-2) PCBs, they do look like someone knocked them up in an etching bath/with a soldering iron in their shed but has th…
... , it's usually the 4116 RAM IC's that go wrong ... repair people say, 48K ULA failure is quite rare - I doubt ...Speccy MTBFHi, Looking at the old (issue 1-2) PCBs, they do look like someone knocked them up in an etching bath/with a soldering iron in their shed but has th…
Mine most bizarre failure was on 48K Speccy, board ... that under one of 32KB RAM chips there is a little ...ANN: SP1 for Z88DK (aka splib3, Sprite Pack v3.0)Well it's finally arrived, after a month of "a few days from now" release deadlines. SP1 is the lastest version of splib, a flicker-free software sp…
... be used to indicate power failure or the expiry of a ... the interrupt vector table in RAM and arrange for our own ... our own interrupt subroutine in RAM running, we need to put ...Spectrum won't load data when warmI've got an interesting observation. I put iPodLinux onto my iPod and got TZX files playing back as the proper audio waveform. I also removed the vol…
... are mapped to the screen ram area.
Its possible ... components drift towards the bordeline failure level.Spectrum RAM Paks...This jogged my memory (excuse the pun!!) : [url]http://cgi.ebay.co.uk/CURRAH-32K-RAM-PACK-BOXED-SINCLAIR-ZX-SPECTRUM_W0QQitemZ150057889352QQihZ005QQ…
... :-)
Still, if a RAM chip in the speccy or ... consumption, twice the odds of failure.Multiface 128 problemHello everyone i have a 48k plus speccy which i firstly thought was working perfectly. It passed all the test of the official Sinclair test tape (cpu…
... chips deal with the 48K RAM switching, and are not present ... 's not a matter of failure as such, just "out of ...Problem with Spec 128k +2 !! Noob calling for help!Hi there, I have an spec 128k +2 which was working fine, played with him yesterday and today when i tried him again he gave me this [URL="http://go…
a typical crash... failure of ram, ula or anything :P
(we got those answers from this forum all the time)Feel my pain......or sit back and laugh yourself sick. Recently upgraded to XP Pro. Getting intermittent crashes/reboots - nothing in event manager. OK reinstall …
... upgraded to XP Pro. Getting intermittent crashes/reboots - nothing in ... problem to be bad RAM. Replaced my 256M strip ... wasn't until the RAM change that things went ... or anything. That bad RAM really was hard to ... track down, as several RAM test programs I had ...Feel my pain......or sit back and laugh yourself sick. Recently upgraded to XP Pro. Getting intermittent crashes/reboots - nothing in event manager. OK reinstall …
... problem to be bad RAM. Replaced my 256M strip ... thread. I switched the RAM and it works ok ... /> -Video drivers
-Faulty RAM
-Other driver issue
RAM, Pagefile or BIOS error ... was trying to fix is intermittent stops. I ran the ...Spritual successor to the Speccy1988-1995 - Atari ST/STe/Falcon 1995-2000 - ? hmmm ? 2000-2006 - Playstation 2 with a keyboard 2007- ?
... but it was a massive failure.[/quote]
The funny ... , forget the 24K of screen ram that needs to be moved ... useful then that 512K of ram, 16 switchable screens to play ...Dead Spectrum +Hi all, I've recently dug out my old Spectrum + with the idea of repairing it. When I last looked at it, when I was much younger, I was soldering a …
... enable logic for the upper RAM (I think it's ... wrong) first for testing upper RAM, since this will disable ... in the cases where upper RAM is merely returning bad ... think a reasonably common failure mode of RAM is to just ... at least test all of RAM and the ULA in ...toasted soeccysHello, ive jsut bought a pair of speccys on ebay (one 16k issue 2 & a prob 48k issue 3) unfortunaly the genius who sold them tried to see if the wor…
... other supplies and removed last. Failure to observe this precaution will ... to system use, where failure of the Vbb supply must ... and GND to the 4116 RAM with the +12/-5v ... likely to fry your lower RAM! Hideous devices, these 4116s... ... be replaced with static RAM!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…
... intensively write to all of RAM in a machine code program ... alternately, get bad values from RAM?
I've seen ... indicated bad disks or bad RAM, but turned out to be ... are so many causes of intermittent faults like that it can ...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…
... sure that there's no intermittent contacts from the 25 year ... - it HAS to be upper RAM or A15
I ... a short routine to test RAM.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…
... are so many causes of intermittent faults like that it can ... ]
You mention the RAM was checked in other machines ... someone reading does not know, RAM access time is usually stamped ... right after the RAM part number, generally after a ...Dead +2B, help required...It was bought defective on ebay. It came with two faults: a "dead" power supply (it was the fuse) and a faulty main unit. The power supply is now re…
... while, it seems IC5 (left RAM circuit, a 4067-10) gets ... trying to discard every possible failure before getting the "ULA dead ...Dead +2B, help required...It was bought defective on ebay. It came with two faults: a "dead" power supply (it was the fuse) and a faulty main unit. The power supply is now re…
Well, I've replaced the RAM: I changed all 4067-10 ... with a white border (previous failure was black with black border ...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…
... /+5v supply at the 4116 RAM is a convenient place to ... .
Incidentally, on bad RAM, don't bet on flashing ... 't forget that the 4116 RAM is arranged such that there ... per data line. If the failure is such (which seems reasonably ...Computer crashes on boot problemHelp, I need help !! My Computer crashes randomly, sometimes just after start-up sometimes it will last for ages. I then get the Blue screen with…
... storm / powercut its prolly ram, try changing ram to test
ive ... had people with loads of ram problems after powercuts/storms/not ... off correctly
you get intermittent problems such as not booting ...Poorly Spectrum + Fault diagnosis help needed!Hi, I've got a Spectrum+. Sometime in the past I broke it and sent it off to be fixed. It came back working good as new, but with an issue 2 board i…
Almost certainly the lower 4116 RAM. The ULA normally gets ... does so because the lower RAM went bad.
RAM. Refer to the diagram ... changing out the 4116 RAM. You'll probably find ... chips have quite a few failure modes - I discuss some ...Poorly Spectrum + Fault diagnosis help needed!Hi, I've got a Spectrum+. Sometime in the past I broke it and sent it off to be fixed. It came back working good as new, but with an issue 2 board i…
... the 4116 RAM is non-intermittently bad (i.e. not intermittent - I ... , it's been bad lower RAM. (That's not to say ... 't cause that, but 4116 RAM doesn't seem to age ... would suggest swapping the 4116 RAM for known good 4116 first ...
