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memory chips spectrum +Hi with regards to memory chips the ones in there are tms4116 in the lower memory.there is some on ebay MCM4116BP20 can i mix these with tms ones or …
Hi with regards to memory chips the ones in there are tms4116 in the lower memory.there is some on ebay MCM4116BP20 can i mix these with tms ones or do they all need replacing.or do i have to use tms ones -
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…
Speed (nano seconds) of memory chips ZX SpectrumThe ZX Spectrum uses 4116 memory for the lower memory, which can be replaced by other sorts or a whole, modern, module, but when searching for 4116 m…
... ZX Spectrum uses 4116 memory for the lower memory, which can be replaced ... but when searching for 4116 memory, what speed in nano ... refreshed, the contents of the memory will get lost? 15ns? ...
Same for the upper memory:
TMS4532-3 Texas Instruments ...help with my original issue 3b from when i was a teen. possible lower ram fault.hello, well ive tried to fix my old speccy, but haven't made much progress. could you help me out with some diagnosis. the fault occurred about…
... . I removed all the upper memory but the fault is still ... /> is this more likely a lower memory fault? or is my rom ... certain before I order a lower ram set.Faulty Spectrum?PLease can somebody help have just bought a ZX Spectrum 48K And the Hobbit game, i cannot get this game to load it crashes right at the end of the l…
... two common types of higher memory IC's - in both cases ... 4 on one machine needing replacement.
both types are ... parts (like the most common lower memory ICs, STC 4116) - these particular ...Dead 48K Speccy.Blow this up as a child... thought I'd get it down from the loft and see if I can repair it. Upon power up, it displays this: [IMG]http://i266.photo…
... - should be easy to find replacement), or an ULA with damaged ... ) is a sympton that the lower memory is not working at all ... ULA wants to read that memory to build the picture, it ... : check the voltages at low memory (5V, 12V, -5V) and see ...More colours II (Was: Most popular new features?)The suggested 4xCLUT multi-colour solution never took off.
... Harlequin full decoding. In the replacement ULA only partial, because otherwise ... the ULA is busy reading lower memory, if the port to be ... means every time it changes memory pages the pallette will change ...ZX Spectrum 48K, issue - works fine till it gets hot (?)ZX Spectrum 48K, issue 2, works just fine, tested with Winston's diag board. At a certain moment in time however, it seems to run hot and stalls. Whe…
... , issue 3B.
The replacement worked as expected, but after ... .php/simm-adapter-for-replacing-lower-memory/12-a-direct-wired-prototype ...repaired a 48K, yay :)I just managed to repair one 48K. After socketing all eight lower RAM chips (hard work!) and replacing few of them, it showed the familiar "Sinclair …
... exist here & there) as replacement for Spectrum DRAMs? ...[/QUOTE]
lower memory of a 48K, after simply ...4116 SRAM replacement (and ULA timings).As mentioned in another thread, I have spent quite a lot of time experimenting with different circuits and components for using a static RAM IC to re…
... .php/simm-adapter-for-replacing-lower-memory[/url]
Read it ... is to produce a 4116 replacement using parts that are still ... for CPU access to the lower RAM. In earlier Spectrums this ... for some of the 4116 replacement circuits I have experimented with ...RFC: Hardware Documentation ProjectI've noticed quite a few threads recently about missing schematics and suchlike. I've also been thinking about the low quality of some of the schemat…
... br /> Identifying a faulty memory chip by watching the screen ... diagnose-low-memory[/url]
Modern replacement for ... br />
SIMM replacement for lower memory:
[url]http://www ... php/simm-adapter-for-replacing-lower-memory[/url]
...16K/48K Lower RAM (4116) replacement.You may want to read [URL="http://www.worldofspectrum.org/forums/showthread.php?t=37957"]this thread[/URL] for background information on the quest t…
That looks very interesting - great work!
I know I've got at least one machine with a lower memory fault, so this replacement module could work out for me... what sort of cost did you have in mind?Poorly Issue One 16k spectrum diagnosis?Hello, everyone. :smile: I was lucky enough to buy an Issue One 16k rubber key the other week; I didn't know it was an Issue One till I opened it up…
... /> Have just ordered a 4116 lower memory replacement module from Zorn, so I ...16K/48K Lower RAM (4116) replacement.You may want to read [URL="http://www.worldofspectrum.org/forums/showthread.php?t=37957"]this thread[/URL] for background information on the quest t…
... to replace the non contended memory bank?
PS: your ... some time ago as a replacement for 4116 too, but with ... .php/simm-adapter-for-replacing-lower-memory/13-making-it-pretty[/url ...Double keystrokes on zx spectrumHappy New Year everyone. I have this spectrum 48k issue 3b I?ve been working on now and then. I have replaced upper rams, installed a lower ram repla…
My guess is that the lower memory is dodgy, and it's ... would be a more realistic memory failure, corresponding to a dead ... said it's had a lower memory replacement already, but I can't ...Newbie with a faultHi all just joined after digging my spectrum out of the loft after 30 years, it was put up there because it had a common fault I remember from back i…
... chips that provide the lower 16K of memory require three different supply ... one or more of the lower RAM chips (these are at ... install new ones. A modern replacement lower RAM board is also available ...Startup colours of the Spectrum ROMHi Folks, Thought I would have a go at changing the startup colours of the Spectrum ROMs used within BasinC which ships with 48.rom (16384 bytes) …
... /> PutWord(@Memory[$12E9], $00ED); // Trap the call to CLS-LOWER. Don't ... , we open the Editor replacement.
PutWord(@Memory[$15E2], $00ED);
ZX Spectrum Test PCB I recently read about one of these (I think it may have been the Retroleum site but I am not sure) and I thought "What a great idea" . As pictured …
... the other ULA logic like lower memory access is fine.
replacement. Leftovers of the cracked keyboard ...New video about S-video modification on Issue two 48K Spectrum.I just finished an s-video modification on an Issue two 48K Spectrum so I made a video about it. Most of the technical details are in the video; if y…
... machine, use modern replacement modules for upper and lower memory, use shielded cables ...Access Database function in ZX-Rainbow S.E. yes or no?Dear friends and users of ZX-Rainbow! history: I have had some problems with ZX-Rainbow S.E. and a very bad time last weeks: The game scanner of ZX-…
... been filled up with memory and the message "out ... lines) needed so many memory. But that wasn't ... , I know that the memory problem occurs only under Windows ... to keep the files in memory for faster access. But ... The Win98 machine has lower memory than the XP one.< ...dead issue 6a boardI've just been back to the uk and found my old 48K + there - and bought it back with me to singapore - it's giving white border and red bars. From wh…
... 've read here this suggests lower memory. BUT 6 times out of ... 's the stack. Upper or lower ram??? Thanks in advance...Bombjack on a +2AI have 1 game left in my wav collection that doesn't load on my +2A, bombjack, well it loads but after i select kempston and then start the speccy re…
... issue 3b speccy, but the lower memory has gone on that so ...ZX Spectrum 48K,issue two - can't get it repairedI have an issue 2, which has some weird very small PCB hanging over the Z80. Some wire go to various places on the big PCB, two go to connections 36 …
... .
I measure on the lower memery chips the following voltages ... me that some of the lower memory chips are gone. I still ... .
I removed all lower memory chips, inserted sockets, and pushed ...ZX Spectrum 48K, issue - works fine till it gets hot (?)ZX Spectrum 48K, issue 2, works just fine, tested with Winston's diag board. At a certain moment in time however, it seems to run hot and stalls. Whe…
... the diag board claims low memory problems and the ZX malfunctions ... the right voltages on the lower memory chips (+5V, +12V, -5V).
lower memory is 100% ok, works in ... swap it for other working lower memory, I get the same problem ...Speccy 128 Shadow screen.How much is the shadow screen used in 128k commercial software? I ask because I am looking at putting 128k of memory in the 48k setup I have been bu…
... looking at putting 128k of memory in the 48k setup I ... the CPU is reading the lower memory (Unfortunately as all the signals ...Kiwi OS for z80 computerHi everyone, Nearly made my z80 computer with 2K ROM 32K RAM. It has an OS im still writing called Kiwi (apple, blackberry, you get the idea ;D) he…
... /> ;2 - DISPLAY ADDRESS AND MEMORY CONTENTS IF DATA CHANGES
MEMORY
CALL PRINT_DHEX ;PRINT ... L ;LOAD A WITH THE LOWER MEMORY
CALL PRINT_DHEX ;PRINT ... controller (to save to I2C memory for removable storage)
...Dead Spectrum+Hi! Any suggestions where to start finding what's broken: Spectrum+ with issue 6A motherboard and nothing on TV. Top row of the upper memory chips g…
... . Top row of the upper memory chips gets very hot (all ... as it usually does and lower memory chips are cool.
I ... of Spectrums with broken upper memory chips but they gave a ...ZX Spectrum not working... issue 4S?Hi, I've bought a "new" broken ZX Spectrum +. The idea was to put an harlequin board inside, but for the moment I'm trying to put it in working order…
... repaired before. It has every memory chip, the Z80 and the ... RAM mounted in sockets.
- Lower memory chips doesn't only have ... /> - Are there any chance that lower memory is still fine or I ... some 4116s?
- Is upper memory more resistant or it will ...New project: CargandoLeches. Ultraloads with ROMHi This project has started months ago, between decicoder, macleod and me. Uses the best modulation of k7zx (throwing shavings). But this ultraloa…
... paging that allows RAM in lower memory (so it works by emulating ...The great 128k ConversionWell, I am not sure if it is going to be great. Hopefully it will! This evening, I set about getting my Issue 6A Spectrum Plus working. I suspecte…
... a start! I suspect the lower memory didn't survive the funky ...
