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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…
... does not care about the lower RAM, it will just grab whatever ... program does need some working RAM...
If there ... want to use a upper RAM replacement module. But before ... broken connections), all the wanted RAM address lines are connected and ... -
doubt about swapping ULA in an issue 2 boardIs it possible to swap a 6C001E-6 ULA type with a 5C112E ? I have this issue 2 board that is not booting, it shows me a black border with horizont…
... DiagROM gives me lower RAM errors, it says all lower RAM is faulty, or ... at the 7805.
RAM IC's are MM5290N
I replaced just one RAM with a modded 4164 ( i ... still shows me an entire lower RAM failure.
I'm ... -
Direct drive LCD screen - looking for information on previous projects people may have attempted.Hi All, My first post, so please forgive and guide if I've posted in the incorrect section. I'm a speccy user from way back in the 80's, but m…
... the Z80 writes to the ‘lower’ RAM area to generate it’s ... -
Were the full Sinclair Loki specs ever actually known?I was just curious. A lot was leaked to the media, but the exact specs seem different depending on source. Some say it could support up to 512x256 an…
... refresh of the 16K byte ‘lower’ RAM did not work as intended ... obviously worked, even if this RAM was only being refreshed by ... and the Z80 accessing the RAM, they did not try to ... -
Anybody got a parts list for an Issue 3b please?I've got a schematic, but does anyone have a parts list with the values just for the resistors and capacitors? Just would save me sometime going thro…
... you use a lower ram board or mod 4164 ram you could do ... -
16pf Capcitors for C72/C73 issue 3b. Can I use 18pf?Looking at the service manual it states to use a 16pf ceramic disc capacitor in positions C72 and C73 on issue 3b boards. Is this very critical in bo…
... power circuit .. and either a lower ram module replacement or some 4164 ... ram with small mod so the ... -
what soldering / disordering equipment do you usemy experience with zx spectrum / amstrad cpc boards 1.cheap solder braid (not good) need to try some better, any recommendations when i looked i go…
... small door ..its removing them lower ram chips that i have to ... -
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 …
... switches ROM and/or RAM banks into/out of ... . But the 16K of ‘lower’ RAM still comes from one set ... 32K of ‘upper’/‘expansion’ RAM still comes from the other ... set of 64K byte RAM chips.
... to load in a diagnostic/RAM test program.
Max RAM for ZX Spectrum gamesHow much RAM can be used for single level/whole game? On tape writing.
... between contended and uncontended RAM is a hardware thing.
RAM there is. This RAM is often known as the ‘lower’ RAM.
RAM. This ‘upper’ RAM is uncontended. The Z80A ... /> In the 128K models, the ‘lower’ 16K which has the screen ...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…
... original
Sinclair ZX 16k ram pack issue 3 .
lower with POKE 16389,n ... lt; 77 (76 and lower) and then do NEW then ... free (RAMTOP lower than ROM + 3.5k of RAM) then ... a posibility of faulty RAM somewhere on the lower
addresses ? ...SRAM replacement for lower 16KSome time ago I wondered if it were possible to replace the lower 16K RAM of a 16K/48K Spectrum with a single SRAM chip. You know, those pesky 4116 D…
... were possible to replace the lower 16K RAM of a 16K/48K ...How the spectrum generates the video from ramHi everyon, I know that most people here allready know this but i think i found out how the spectrum acctually dispalys stuff and why the LD x, (HL)…
... the first K of ram to video memory and ... cant also read the lower addresses at the same ...
The spectrum has its lower 16K separated from the higher ... is accessing the higher order ram (> 16K) the ULA ... data. Thing is the lower chip only needs to be ...Lower Memory - Why Multiple Voltages?Having spent much of the weekend working on getting my old Spectrum working, my Dad (who is visiting) and I were chatting about the schematic. Given…
... />
Given that the upper RAM in a Spectrum is of ... the 4116 in the lower portion of RAM?
Surely it ...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 ... or 512x192 ) to occupy the lower 48K of memory and leave ...Emulator compatibility with real SpectrumHi emulator programmers... Having spotted for the last 6 months that my iPAQ is still missing a Spectrum emulator I started typing last tuesday - an…
... the fact that the lower part of the RAM is slower because ...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 ...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, GnormanSpin save dissembly problemHey Dunny and others Spin dudes! There seems to be a small problem with the save dissembly function from the dissembler in Spin. This is the exact o…
... output from a section of RAM.
[CODE]
org $67c2 ... the problem of either a lower case L prefix or extra ...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?
