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DRAM (:baffled:)Hi, Can someone explain to me the definitive rules on DRAM access times in terms of suitability for a particular speed of processor? Specifically, …
... me the definitive rules on DRAM access times in terms of ... have a number of handy DRAM chips that are 60ns (compared ... -
DRAM without powerSomething interesting I noticed last night, after making a bad Spectranet ROM image which crashed the machine... Looking at the image on the screen,…
... for the maximum time between DRAM refresh cycles. Perhaps the values ... -
Understanding DRAMI think I am going slightly mad. My hardware knowledge has got more rusty than it should have done, and I am going to have to turn to the experts to…
... head around the way that DRAM, and specifically upper memory is ... -
Question about 48K DRAM refreshHi guys. Can anybody tell me how the 48K spectrum refreshes the upper ram. RAS only? CAS before RAS? I've got a bunch of 41256 DRAM that i would lik…
... got a bunch of 41256 DRAM that i would like to ... -
Faulty DRAM chips wanted!If you have any suspect or known faulty DRAM chips, I'm after some so I can conduct some testing. I only want chips that are DIL type, either 16 p…
... any suspect or known faulty DRAM chips, I'm after some ... -
4116 4164 DRAM testersSaw this and thought it may be of interest. https://www.ebay.co.uk/itm/DRAM-TESTER-for-4116-ZX-Spectrum-48k-other-retro-computers/154054505831?_tr…
... ://www.ebay.co.uk/itm/DRAM-TESTER-for-4116-ZX-Spectrum ... ://www.ebay.co.uk/itm/DRAM-TESTER-for-4164-ZX-Spectrum ... -
Replacment 3" drivesIs there a place to get them. ?
Is there a place to get them. ? -
4116 DRAM for 48KSomeone told me I got faulty RAM in my broken 48K. They should be 150ns, right? What would be a good place to buy them from?
Someone told me I got faulty RAM in my broken 48K.
They should be 150ns, right?
What would be a good place to buy them from? -
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…
... . You know, those pesky 4116 DRAM chips, that need 3 different ... -
Spectrum Serial Numbers Wanted!![b]This post updated Sept. 26, 2013[/b] As far as I know, the serial numbering system for the Spectrum has never been fully worked out. For the p…
... [Hitachi / NEC / other] [Datecode]
DRAM : [ProductCode] [Datecode]
Modulator : [Datecode ... ROM : Hitachi 8213
DRAM : MM5290N-2 8206, 8137, 8204 ... -
Happy Birthday jmkHappy Birthday jmk! Treat yourself to a wee dram! Ach Eye The Noo!
Happy Birthday jmk! Treat yourself to a wee dram! Ach Eye The Noo! -
48K Speccy Repair Log.Some people may know my love for writing up my repairs of arcade PCBs on various forums so thought I would do the same for this little fella. Had th…
... a set of eight 4116 DRAM chips. These are very ... a bank of 8 4164 DRAM chips, again each providing ... are the infamous half faulty DRAM chips, they are actually ... slightly more than the 8 DRAM chips, a 74LS00, a ... to removed the 8x16 pin DRAM chips its a bargain, ... -
Dumb question but deep answer wantedWhy is the ram on the 48k made up of 8 chips. Both upper 32k and lower 16k (4116) are set up like this. Taking the 4116 as an example this us a singl…
Why is the ram on the 48k made up of 8 chips. Both upper 32k and lower 16k (4116) are set up like this. Taking the 4116 as an example this us a single 16k dram chip, so why the need for 8 of them?
I've read so much I am going snow blind;-) -
Memory upgrade for ZX Spectrum 16/48This is external memory upgrade for ZX Spectrum models with 16kB ram. Can be connect also to 48kB models, but need remove 8 dram chips (from sockets …
4116 and 4164 chip avaliableHi all, while clearing out lots of old odds and sods I have come across a fair number of old dram memory chips. I have 200+ 4164 from various manufa…
... a fair number of old dram memory chips.
I have ...Velesoft's ZX128+2 with 1.5MB memoryMy old ZX128+2 PROFI (grey model - spanish version) for sale here: [url]http://aukro.cz/super-zx-spectrum-128-2-1-5-mb-i2738723874.html[/url] Back s…
... is in sram memory. 8 DRAM chips in ZX is used ... for keyboard
- all dram chips, CPU,rom, hal, TEA2000 ...Diodes placed the opposite way in +2A/+3 PCB'sI was just going to report this as a mistake in the schematics drawn by Guesser, but I saw a real board and realize that the schematics are right. […
... the RAM address too, as DRAM's don't care if ... there is a unique DRAM address, and DRAM address are always supplied ...Repalce 4164 RAM by 41464Dear all, I have some amount of 41464 DRAM from old PC VGA card which are useless at the moment. I think to keep them as a spare for the upper 32k R…
... have some amount of 41464 DRAM from old PC VGA card ...FS: MOSTEK 4116 DRAM for 48k SpeccysHi I have a bunch of Mostek 4116 DRAMs here for the 48k Speccy - fits in the lower 16k memory bank. They look like NOS unused, still in their origin…
Hi
I have a bunch of Mostek 4116 DRAMs here for the 48k Speccy - fits in the lower 16k memory bank. They look like NOS unused, still in their original MOSTEK printed chip holder tube thingies.
Asking ?7.95 for a set of 8, plus P& ...Tinkering with DMASo, some afternoon tinkering... [img]http://photo.alioth.net/tmp/dma_small.jpg[/img] The purpose of this all is to see what's possible using the Xi…
... won't go over any DRAM refresh maximums).
This ...Joytsick Interface damaged SpectrumHello All, Sob.. I am a plonker, I did the cardinal sin, I was testing a bunch of joystick interfaces that I got off ebay and one didn't have the ke…
My experience with a ZX Spectrum clone called Elwro 800 JuniorAfter a long break in using this forum (modellrailroading is my main hobby) I'm back and want to tell something about an interesting ZX Spectrum clon…
Spectrum Ram UpgradeHi, I am looking to upgrade my 16K Spectrum to 48K. I have some 41256 dram chips from an old QL memory expansion, can the Spectrum us the large…
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I have some 41256 dram chips from an old QL ...Screen corruption with devices on edge connector (grey +2)Hi, I've recently done a full capacitor replacement and replaced all 16x DRAM chips on my grey +2. Prior to this I would get a corrupted screen…
... replacement and replaced all 16x DRAM chips on my grey +2 ...Using a thermal camera to fix speccy's.Hi All, Thought I'd share another repair... Got a board that collapsed the bench supply straight away ( I run a bench supply and give it just enou…
... to identify and locate faulty DRAM chips... It does tend to ...cotrols of wolfenstein type gameif would be a wolfenstein style game written for spectrum, what kind of control should be used ? just turn left, right, go straight, go back via joys…
Yup, sounds like the same one...if I remember right, OCP Art Studio also came with this wee orange plastic thing that you used to decrypt an onscreen code, which I lost quite a few of, and had to write to the company for a replacment.C64 & Spectrum loadingscreens!I was bored today, so I decided to compare some stuff. :) [url="http://www.lemon64.com/loadingscreens/"]http://www.lemon64.com/loadingscreens/[/ur…
... the row part on the DRAM pins, strobe it, place the ... column part on the DRAM pins and then read the ...