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Whole upper memory lostHi! I own a rubber key Spectrum with 48K RAM. Suddenly it lost it's whole upper memory. All diagnostic programs says that it's 16K model with workin…
... , is a possible failure mode for RAM chip and/or circuit ... single bit failure is enough to declare a RAM chip failure. Since in ... :smile:
True the upper 32K logic IC's could ... as repair method. Luckily the upper 32K normally sits in sockets. -
Upgrading 16k MemoryHi All I have a fully working issue 2 16k spectrum and a broken issue3 48k spectrum (It's showing the black and white bars and some flashing blocks)…
... be a fault in the upper 32kb ram or logic chips. I ... 'm left with 2 working 16KB spectrums, which is actually quite ... -
Upgrading 16k MemoryHi All I have a fully working issue 2 16k spectrum and a broken issue3 48k spectrum (It's showing the black and white bars and some flashing blocks)…
... a fault in the upper 32kb ram or logic chips. I ... that failed RAM chip(s) in the [I]upper[/I] 32K ... you have maximum number of upper 32K chips inserted & ... m left with 2 working 16KB spectrums, which is actually ... x 8 bit static RAM chip for upper 32K (soldered on ... -
Hi everybody! Need help trying to rescue a ZX 48K...Hi, since this is my first post, a bit of info about me: I'm an Italian guy, now living in Poland (Warsaw), informatics and electronic geek since…
... lower 16K RAM is more exposed to failure than the upper 32K block ... that some of the lower RAM is defective.
Check if ... any of the RAM-chips are hotter than the ... just have to replace the RAM and see if it helps ... -
128k gone badHi All, Turned my 128k on this morning and... [img]http://www.w.angold.btinternet.co.uk/bad128small.jpg[/img] Can anyone help? whats the most lik…
Almost certainly bad RAM (one or more bad RAM ICs)
If you have a DivIDE or any other piece of hardware that makes a 128K come up in USR 0 mode, if the failure is in upper memory it's very easy to find using BASIC POKE and PEEK. -
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…
... /infoseekid.cgi?id=1000328"]RAM Turbo interface[/URL] with ... Sinclair/Interface2/Cartridges/Interface2_RC_New_RAM_Tester.htm"]RAM test program[/URL].
... of dealing with a DRAM failure, is to remove all ... />
If the upper 32k of RAM is suspected, you can ... -
Issue 3 board with strange piggy-back boardIn case you are interested. I?ve never seen something like this before. I have an Issue 3 board here. When I opened the case and found a strange pig…
... to the datasheet of 16kb lower RAM -5v and 12v must ... risk to destroy the Ram Chips during measuring and ... ram chips and then start to check for the failure ... solder the powerlines to the ram chips again.
... never killed one single Ram chip. But as usual ... -
DivIDE allram mode help neededHi guys, are there any DIVIDE wizards out there that can explain how i page in the allram and add a rom file to it i sometimes need to load spect…
... full ALLRAM mode with 16kB ram paging in zx rom ... easy switch between two 16kB rom pages and disable ... or enable writing to low 16kB (writeprotect). More info ... this cause switching of upper 8kB part of rom ... you can use switching of upper 8kB (area 8192-16383) ... -
48K ZX Spectrum 48K Recap (Capacitors) Or Not?I have seen arguments "for an against" on this subject by some "high calibre" experts . So if the experts can differ on this question then my questi…
... the 2 between the upper and lower ram. It gave symptoms of ... , fall into the ‘renew on failure’ category.
Let me ... of a possible electrolytic capacitor failure, I’m not saying ignore ... the -5V rail will fail. Failure of the -5V rail may ... -
How Many Games Exist in Both 16K versions and 48K Versions ? I have found one ( Dallas (CCS) 1982 but there could be some more
... worried it might of used upper memory but it seems not ... work on a 16Kb machine (cause only 9Kb RAM actually available)? But ... the ROM carts could use the full 16Kb ... cart version works on a 16Kb machine. IIRC Chess was the ... -
Are 128K games more likely to crash than 48K ones?Hey, guys. I've been doing some experimenting with various games and even some music demos and apps, and I'm beginning to reach a conclusion that …
... 64K byte RAM chips, and the 32K of ‘upper’/‘expansion’ RAM still comes ... from the other set of 64K byte RAM ... address range, if such a failure did occur, assuming the ... to load in a diagnostic/RAM test program.
... -
How do I know the RAM size?Just left my parents after cleaning out my pile of old stuff in their basement. Know what I found? My old ZX Spectrum.... Those were the days! Never …
... ZX81, though.
3K om RAM, my friends!
My question ... I tell what size of RAM I've got in my ... -
Didaktik M (ZX Spectrum clone selling)Here is an offer to buy ZX Spectrum clone ( DIDAKTIK M ) from Slovakia, basic info: 100% functionality, Kempston & Sinclair joysticks connectors, tap…
Here is an offer to buy ZX Spectrum clone ( DIDAKTIK M ) from Slovakia, basic info: 100% functionality, Kempston & Sinclair joysticks connectors, tape device connector, TV and VIDEO out, 48kB RAM/ 16kB ROM. Price GBP 50. -
Dan Dare 256 colour project many may not be aware of.I still need/want to try Vladimir's emulator. But I think many people here aren't aware of another 256 colour project, which was mentioned on C.S.S. …
... simple - every RAM page has its
real 16kb, then an additional ... -
Pentagon interface news from VELESOFTIt's from Xagon's board. It is about new interface for Speccy - it make Your comp compatible with Pentagon (and not only) and also it gives You up t…
... You up to 1024Kb of RAM.
_________________________________________
... mode.
(everywhere fast ram)
Page switch via 7FFD ... of ROM into the low 16kB area.
I did ...
memory area above 128kB RAM)
- a difference ... -
XK SystemIn Your Spectrum issue 8 it mentions a hardware paging system called the XK system, this paged the top 32KB of memory. It allowed 4MB to be used and…
... that sat in the first 16KB of RAM. This let BASIC programs ... -
HELP 4532 or 4864 RAM wanted !Hello My real spectrum fell off yesterday I know that one RAM memory chip is out of order There was 8 X HM4864P-2 but I saw in the Spectrum schemati…
...
I know that one RAM memory chip is out of ... here to set 16K of RAM so 32K are enough to ... -
RAM Music MachineBoxed RAM Music Machine Sampler (for 48K, Plus, 128K, Plus two) includes the tape, microphone, manual, even original mic stand! I last got this wor…
Boxed RAM Music Machine Sampler (for 48K, ... -
Boxed 32k Ram packPicked one up a few weeks ago at a car boot sale with a boxed 16k Speccy. Is the ram pack worth anything? Not seen any on Ebay. Thanks in advance, G…
Picked one up a few weeks ago at a car boot sale with a boxed 16k Speccy. Is the ram pack worth anything? Not seen any on Ebay.
Thanks in advance, Gnorman -
ZX-81 Ram Pack problemHi! I know this is a ZX Spectrum forum, but I am hoping someone here might be able to help me out... I have posted this to c.s.s. but noone was able…
... which is probably normal since ram
test takes a ... original
Sinclair ZX 16k ram pack issue 3 .
ram pack :
... a posibility of faulty RAM somewhere on the lower ... />
Also when no ram pack is present I can ... -
R Register, Contended RAM and ClonesHi. I've had a quick look at the CSS FAQ but didn't spot quite what I'm looking for (also the CSS FAQ doesn't have much detail of the clones - there …
... is the effect of contended RAM on the R-register? I ... run any code in contended RAM, but I do make several ... , but then without the contended RAM the HALT would take place ... -
RAM Test ROM?Found a link to this: [url]http://www.retroreview.com/iang/TestSpec4.zip[/url] in another thread, and fired it up in SPIN, but I have no clue how to…
... this to determine which physical RAM chip needs replacing, and/or ... -
256K RAM chips in Spectrum 128KSince I have lot of 256K RAM chips, and my 128K has RAM error, I think about replacing all 16 RAM (64K ones) chips with 256K chips. Then it would be …
... have lot of 256K RAM chips, and my 128K ... has RAM error, I think about ... replacing all 16 RAM (64K ones) chips with ... be 'Spectrum 512K' - something like RAM in Pentagon.
... bank switching of that extra RAM - we need 2 bits ... -
Where to get Spectrum RAMSigh. Even obsolete nixie tubes seem to be easier to get hold of than Spectrum RAM. I've tried the usual suspects (eBay and google searches), but not…
... get hold of than Spectrum RAM. I've tried the usual ... dead Spectrums with suspected bad RAM. It'd be nice to ... -
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…
... ebay.co.uk/CURRAH-32K-RAM-PACK-BOXED-SINCLAIR-ZX- ... with one of these 32K RAM paks!
My poor ... 16K model with this 32K RAM pak.
It ... them!
16K RAM paks were very popular for ... -
Betadisk RAM modificationHello! I've ocassionally found this on the web: [url]http://www.nairam.sk/betadisk.html[/url] [url]http://www.nairam.sk/betadisk_02.gif[/url] Doe…
... it adds a little shadow RAM into betadisk to be paged ... -
Black paper, white border. Ram fault?We have a speccy that wont work properly. When we power it up, we get white border around a black screen. We swapped the rom and ula with a working o…
We have a speccy that wont work properly. When we power it up, we get white border around a black screen. We swapped the rom and ula with a working one, and we got the same result.
is this a ram fault? How can we check ram chips? -
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…
... of the memory chips lower 16KB and upper 32KB
[url ... -
Any interest in new low-cost mass-storage interface with 512K RAM?I've recently added support to ResiDOS and the +3e ROMs for SD/MMC card interfaces; in particular, ZXMMC (which has no onboard RAM and so is only sup…
... (which has no onboard RAM and so is only supported ... of on-board non-volatile RAM (which would allow it ... be the 512K battery-backed RAM and a snapshot button. ... in the built-in RAM and are instantly available ... run from the built-in RAM, including ZX80 and ZX81 ... -
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 …
Hi
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 50 from Hong Kong but only need 10.
Best wishes
Martin Baugh
