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faulty zxspectrum +hi all i just bought a speccy 48k+ off ebay it worked for like 15 mins now it is stuck on the reset screen. I fear this is something major maybe fau…
None of the lower memory chips seem to get hot, ... with the rom chip if lower memory isn't hot and only ... -
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 …
... there are tms4116 in the lower memory.there is some on ebay ... can't. The spectrum low memory use 4116 -15 ( 150 ns ... -
Spectrum 48k Composited-modded motherboardI have a bit of a problem I'm hoping someone can help me with. I have a 48k Spectrum here in the USA and somehow, it's dead. I am looking for a new m…
I have a 48k+ spectrum that has comp mod and runs direct video from the tv output but the lower memory has a dead chip or maybe more it is stuck on the reset screen, if you don't mind changing the 4116 chips you can have it -
TRD/SCL importer for MB02+ and PROFI INTERFACEHi all MB02+ users, I know this time noone of you will be able to use my new program, because with MB02+ you will also need Velesoft's PROFI INTERFA…
... interfere with the mb02+'s memory?
Greets Ingo ... to add and use extra memory, when we have 512KB ... IF to bring us extra memory. I use PROFI IF ... : MB02+ is paging in lower memory. Even if we had insist ... well as enough of 1MB memory, so no writting of ... -
Spectrum hangs upWhat might be problem when my ZX Spectrum 48K (rubber keys) hangs up after few minutes play? It had memory problems but i changed (or an expert did i…
... .
- A bad lower memory chip with intermitent failures.
To test lower memory only, run this program and ... /> To test both lower memory and upper memory, use 32763 for ... (when not testing lower memory, when testing lower memory you will see that ... -
Spectrum hangs upWhat might be problem when my ZX Spectrum 48K (rubber keys) hangs up after few minutes play? It had memory problems but i changed (or an expert did i…
... entered address 30000 to test lower memory (because Deathcase crashed). After 30 ... test program to test upper memory and no crashes. One test ... -
Speccy repairs?I've finally got round to testing all the various Spectrums that I seem to have accumulated over the years and discovered that "my" two machines (i.e…
... time it's lower RAM that's bad. 4116 memory doesn't ... again, it sounds like bad memory. Only testing it can tell ... the voltages are present, 4116 memory needs three voltages - +12v, +5v ... , then it actually kills the lower memory chips, the TMS4116 data sheet ... -
The Sadness of my Decaying Speccies.I've been avidly collecting ZX Spectrums since the late 90's and whilst at the time of the late 90's and early millennium my Spectrums and associated…
... .php/simm-adapter-for-replacing-lower-memory/11-the-alternative[/url]
The Sadness of my Decaying Speccies.I've been avidly collecting ZX Spectrums since the late 90's and whilst at the time of the late 90's and early millennium my Spectrums and associated…
Here's another link Miguel sent me (thanks Miguel):
[url]http://www.zxprojects.com/index.php/simm-adapter-for-replacing-lower-memory/13-the-alternative[/url]Issue 2 Speccy faultHi Guys, I'm really hoping someone can help me with a fault that has just developed on my issue 2 speccy. After perservering for some time with usi…
... likely that one or more lower memory IC has developed a fault ... voltage is reaching the 4116 memory). The 4116 RAM requires 3 ... , the next step is a memory test but this will require ...128+ and Divide+ not working togetheri think theres something wrong with my 128 (toastrack), divide+ just wont work on it, corrupted screen on bootup and with big thick black bars rollin…
... the data was fetched from lower memory (the other side of the ...Spectrum 48k boots but small black dots start appearingAnyone any ideas where I should look first?
... pixels then one of the lower memory chips could be suspect. Theoretically ...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 …
Hi Robin,
The 48k has 2 memory banks. The 4116 chips are the lower memory and make up 16k. The upper memory is comprised of 8 broken 64k chips. They are broken (cheap back in the 80s) and can only see 32 of their 64k.ZX Spectrum Woes...In my endeavours to get my second Spectrum (Issue 3) working I have replaced the CPU, memory and lower ram. I have fitted sockets for the CPU and me…
... /> I'd be leaning towards lower memory in your case, even though ... getting past the lower memory, if it was upper memory you would at ...Is this the infamous Dead CockroachCan anyone help me. I have an issue two spectrum that I want to list on ebay, but I want to know if this has the dead cockroach ULA fix. I would have…
... the difference between addressing lower memory and addressing lower IO ports, and halted ...Double buffering on SpectrumHey! I am new to Spectrum developing and I have a hard time to find some specific info or tutorials explaining the basics. I have already found simp…
... a temporary location in a lower memory address before using them.New platform game: Sid SpannersHi all, here is my Christmas present. A new platform game (well, more of a mini-game really). [url=http://java.cms.livjm.ac.uk/homepage/staff/cmspc…
... enemy sprites into the available memory. Memory was in the end, ... already initialised. Therefore, dynamic memory allocation can overwrite the system ... having them in upper memory, but if memory is an issue ... that "awkward" part of lower memory from a C program. I ...Amperage drastic reduction in a rubber 48KWell, I am now with the approach of a drastic reduction ZXSpectrum amperage. As a first step would change the Z80 processor for other (Z80C). Unfortu…
... get rid of all the memory and replace it with modern ... got rid of the crappy lower ram chips.[/QUOTE]
lower memory, IC25 & 26 and changing ...Switching on my Spectrum+Trying one of my Spectrum+ results in not getting as far as the copyright message. The screen is all garbled displaying black boxes and lines and the…
... do need to get some memory chips, though. I'll look ... .php/simm-adapter-for-replacing-lower-memory[/url]
I think, this ...48k dots appear but not with CUB monitorToday I tried out an issue 3 and an Issue 2 with the CUB monitor, to my surprise they both worked flawlessly, now before when I tried them on any oth…
The LM chip cannot cause a reset or fill the screen with garbage, even if faulty.
It sounds more like faulty lower memory, but then why will it work with CUB?48k dots appear but not with CUB monitorToday I tried out an issue 3 and an Issue 2 with the CUB monitor, to my surprise they both worked flawlessly, now before when I tried them on any oth…
... my Spectrums, when I replaced lower memory by a SIMM module. The ... .php/simm-adapter-for-replacing-lower-memory/12-a-direct-wired-prototype ...48k dots appear but not with CUB monitorToday I tried out an issue 3 and an Issue 2 with the CUB monitor, to my surprise they both worked flawlessly, now before when I tried them on any oth…
... my Spectrums, when I replaced lower memory by a SIMM module. The ... .php/simm-adapter-for-replacing-lower-memory/12-a-direct-wired-prototype ...Dead Spectrum SocietySo I'm getting back into real Sinclair computers rather than emulators. During the summer months I was lucky enough to buy a working ZX81 and was giv…
@absinthe boy
That sounds like a memory fault, although I wont rule out a ROM fault either.
I would suggest replacing the ROM, test and then if need be start replacing the lower memory area first.Repairing a faulty 48K issue 2.I am investigating one of a pair of non-working issue 2 48K Spectrums that have been sitting in a cupboard untouched for quite a few years. I haven…
... br />
With all the lower RAM missing, a "working" Spectrum ... the ULA, in absence of lower memory, "reads" the CPU bus ... />
So, in absence of lower RAM, shorting C27 and leaving ... seen some schematics about replacinig lower DRAM with SRAM at the ...Colour blocks on displayHi all, I have just acquired another Sinclair product, my first one being a C5, it's a 48K ZX Spectrum. It shows colour blocks on the display when p…
... see whtehr any of the lower memory chips got significantly warmer than ...Colour blocks on displayHi all, I have just acquired another Sinclair product, my first one being a C5, it's a 48K ZX Spectrum. It shows colour blocks on the display when p…
In conclusion, should I look at changing the lower memory chips and seeing if that solves it?Colour blocks on displayHi all, I have just acquired another Sinclair product, my first one being a C5, it's a 48K ZX Spectrum. It shows colour blocks on the display when p…
... well as all the 4116 lower memory chips. If someone could point ...
