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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, …
... cause problems.
The 150ns 4464s I use in my ... -
sinclair zx spectrum issue 6a (again) - how to repairHi All, Is there someone who may explain what these jumpers can be used for. [url]http://forest.no-ip.org/repair/jumpers.gif[/url] <- this is from …
Hi All,
Is there someone who may explain what these jumpers can be used for.
[url]http://forest.no-ip.org/repair/jumpers.gif[/url] -
Anyone after 4164s...If anyone's after 4164 RAM... ... I'm in Houston at the moment, and EPO has some 4164 RAM in the shop, 100, 150 and 200ns variety, for $1 each. If …
If anyone's after 4164 RAM...
... I'm ... moment, and EPO has some 4164 RAM in the shop, 100 ... -
Upgrading to 48kI picked up a 16k Issue 2 Spectrum over the weekend, and I'd like to upgrade it to 48k. I've scanned an old [URL="http://www.drumfu.com/SinclairZXSp…
... :
[CODE]8 x 4164/4564 [IC15-IC22]
1 ... -
Problem upgrading 16K SpectrumHello Spec-chums, I've been a long time Commodore user, but also a long-time Speccy admirer (and emulator user). I've recently got hold of a Issue 2…
... . Removing any one of the 4164 RAM chips allows it to ... -
Another badly behaved RAM upgradeI have a 48K issue 4A board (yellow it is) that was a 48K machine from new, but only reports 16K working with the Sinclair ZX Test ROM in an Int2. H…
... with a socket and numerous 4164 chips have been cycled through ... I de soldered all the 4164 chips and fitted sockets and ... -
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? -
ULA gets so hot, it is cracked open!Hi everyone. I have bought a rubber-keyed 48K and the seller said he was selling it as "for spares/repair." Sure enough, it turns out it doesn't work…
... ULA and some 4116 and 4164 RAM chips.
What ... -
issue 6a faultyHi All I got issue 6a pcb from ebay with status faulty pcb had bad voltages when I power up I changed tr4 ztx650 and all voltages got back on ic6 I h…
... old chips oki3732, put new 4164 chips changed bridges to mic ... too
my 4116 and 4164 chips I got from working ... -
Snow on screen of 48K Speccyok you wizards I fixed up my 4116 ram issue as Winston and McLeod advised me before by replacing with 4164's.... all I could find here in Singapore (…
... me before by replacing with 4164's.... all I could find ... -
Broken ram or what?Hi! I own ZX Spectrum 48K. When i run command PRINT PEEK 23732 + 256 * PEEK 23733, I should get answer 65535? But i get 49151. In my machine the upp…
... /> So i bought 8 new 4164 chips, but same error: i ... -
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…
... is a bank of 8 4164 DRAM chips, again each providing ... 74LS157s were missing and the 4164 DRAMs were socketted, the sockets ... the wrong type for normal 4164 chips. The link didnt look ... -
Memory upgradeHi! I bought a 16K rubber key Spectrum. It's said in the box and memory test program also said it's 16K machine. Strange thing is that there is yell…
... is: If i buy eight 4164 chips, should i buy and ... -
128k Toastrack repair advice needed..Hey all, Just got my second toast rack in a oddball deal when i visited a local farmer for some other second hand stuff. The 128 was sitting in a p…
... to measure with from the 4164 area, hope that's ok ... -
Difficult to find upper RAM fault.I've recently repaired an issue 3B 48K Spectrum that had a tricky to diagnose upper RAM fault, so I thought I'd post a report of what I found here. …
... , a 16 pin socket and 4164, this Spectrum now works perfectly ... -
TR4 continues blowing up!The TR4 of my Speccy Issue 3 continues burning even after I changed all electrolytic capacitors and the BA157 diode. If these things serve only to h…
... I remove all 4116, add 4164 and use a +12V power ... -
4116 replaced with 4164 - ProblemsThanks to Velesoft I have some 4164s, and I have cut the -5V line below R9 where it pass from one side of the PCB to the other. I have cut the +12V a…
Thanks to Velesoft I have some 4164s, and I have cut the -5V line below R9 where it pass from one side of the PCB to the other. I have cut the +12V at C44 where it goes to Pin 8 on the lower ram. And I have left +5V on A7 for now. I have routed +5V to pin ... -
A small thoughtexperiment.Hi. Let's say that i have a 48K Issue 3b spectrum, and i want to be able to disable the top 32K ram from an external interface. This interface would…
... . If i'm reading the 4164 datasheets correct, this would put ... -
Replacing Upper RAM in 48KHi Folks Well, my fun continues :) After sorting the display issues with this machine I found I couldn't load software meant for 48K machines. Havin…
... , install a socket and insert 4164?
Looks like the ... -
Lot's of ZX Spectrum parts: RAM chips, ULA's, etcI have new stock of 100% tested parts. I even got my hands on a bunch of ULA's!! [IMG]http://benophetinternet.nl/hobby/sales/parts/IMG_6068.JPG[/IMG…
... /> Prices:
- Ram chips: 4164, 4532, 4116, etc
- Logic ... -
March offers: lot's of parts!!!I have PLENTY parts available like a lot of 4164 ram chips. I even got some rare spare parts like ZX Spectrum issue two ULA's. - Logic chips: 74LSXX…
... available like a lot of 4164 ram chips.
I even ... [/B]
- Ram chips: 4164, 4532, 4116, etc
[B ... -
+2 grey Contended RAMhi all, i have some quenstions about, contended RAM are banks 1,3,5,7 banks are the pairs of IC's (4164), so 1 pairs = 16k X 4 pairs = 64k this 64…
... the pairs of IC's (4164), so 1 pairs = 16k X ... -
another faulty zx spectrum +2 to fix!!!Hello to all, I'm new here... I have got a faulty +2 (gray) and start to try fix it... I have read the treads of xaris_sm and Pluto63 as background…
... for the ZTX650 and some 4164 but in the meantime I ... -
Anyone got any 4146 RAM chips?Hi I'm looking for some 4164 RAM chips, as would be fitted to a 128k Spectrum (+, +2, +3 I think they all use the same memory). Not out of a 48k mac…
... /> I'm looking for some 4164 RAM chips, as would be ... -
ZX Spectrum upper RAM module (4532/4164 replacement)Following the [URL="http://zx.zigg.net/LRR/"]lower RAM replacement module[/URL], there have been quite a lot of requests for something similar for th…
Following the [URL="http://zx.zigg.net/LRR/"]lower RAM replacement module[/URL], there have been quite a lot of requests for something similar for the upper 32K RAM in a Spectrum.
I am pleased to be able to offer such a thing for sale. I haven ... -
August sales[COLOR="Blue"]I have about everything listed here in stock. But some of it must be made ready (with custom wishes). [B]Buying directly will save you…
... /hobby/vanmezelf/sales/4164.jpg[/IMG]
[B]4164 chips new old ... stock[/B]:
- 10x 4164: ?8 / €9 (more info [URL ... eBay offer[/URL])
- 20x 4164: ?15 / €17 (more info [URL ... -
Ben Versteeg's September sales[COLOR="Blue"][B][SIZE="6"]Add-ons[/SIZE][/B][/COLOR] [IMG]http://benophetinternet.nl/hobby/vanmezelf/sales/line.jpg[/IMG] [IMG]http://benophetinter…
... .jpg[/IMG]
[B]4164 chips new old stock[/B ... ]
- 8x 4164: ?7.5 / ?8
- 16x ... 4164: ?13 / ?15
[IMG] ... -
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…
... * 128 = 16384 = 16k.
4164 chips are 64k bits. This ... -
are 4164's the same as mt4067-12just wondering if I can use as direct replacements as I have a +2a here with ic5 and ic4 overheating, also what are the correct voltages for these ic…
just wondering if I can use as direct replacements
as I have a +2a here with ic5 and ic4 overheating, also what are the correct voltages for these ic's?
thanks in advance -
Ben Versteeg's November sales[COLOR="Blue"][B][SIZE="6"]Almost ready[/SIZE][/B][/COLOR] [IMG]http://benophetinternet.nl/hobby/vanmezelf/sales/line.jpg[/IMG] [IMG]http://benophet…
... .jpg[/IMG]
[B]4164 chips new old stock[/B ... ]
- 8x 4164: ?7.5 / ?8
- 16x ... 4164: ?13 / ?15
[IMG] ...
