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Jetpac questionHi all, I just bought a copy of Jetpac off of Ebay and I'm having problems. To start, I'm trying to play it on an issue 2 Speccy with Interface 1, 2 …
... failure modes of Spectrum RAM with that test. I ... at least for the 4116 lower RAM) the most common failure ... for bit fade, once RAM has passed the inversion ... fill tests, set the RAM for an inversion pattern, ... passes, the lower 16K for the 4116 RAM, and the ... -
R.I.P. spectrum 48kRecently one of my 48k rubber key (issue 4) machine bit the dust the other day when I tried to power it on. When powering it on, it gave a weird 'bee…
... would suggest it's a lower RAM failure, but it could be ... -
R.I.P. spectrum 48kRecently one of my 48k rubber key (issue 4) machine bit the dust the other day when I tried to power it on. When powering it on, it gave a weird 'bee…
... this one...bet it's lower RAM going faulty. This seems to ... -
R.I.P. spectrum 48kRecently one of my 48k rubber key (issue 4) machine bit the dust the other day when I tried to power it on. When powering it on, it gave a weird 'bee…
... this one...bet it's lower RAM going faulty.
.... swap chips ... voltages before (even try) swapping lower RAM!!!
[QUOTE=Winston;334096 ... -
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…
... screen data coming from the lower RAM to the ULA. When the ... -
Issue 3B problemHi! I have an issue 3B board that is having a strange problem: when I got it it didn't had the -5V and +12v, as usual. After replacing TR4 and TR5 t…
... , but if either Z80, ROM, lower RAM or ULA were faulty, the ... -
upgrades what you looking for?i start working for upgrades for ZX, but i'm Atari specialist and i don't know exactly what you need for ZX. On the moment i have DIVIDE in stock, an…
... card to replace faulty ram ic's with some readily ... one ;)
Recently replaced the lower RAM on a Speccy 48K with ... -
issue 4s for reapirHi All, This time I have issue 4s for repair :) Here is few screen shots and small movie after boot. [url]http://forest.no-ip.org/issue4s/[/url] I kn…
... have sockets for cpu and lower ram :)
result pictures here [url ... -
Trouble with Spectrum 48kI think it is a Rev 3 (Issue 3 on the motherboard). The screen has weird characters, instead of text, and the keyboard is not responding (although it…
... it's a problem with lower RAM. This is the most usual ... -
Two dead SpectrumsHi all, Long time since I posted on here. I'm having a bit of a clear-out, and I've re-discovered two Spectrums I had in the loft : One is an orig…
... almost always means the lower 16K of RAM is dead. 4116 memory ... functioning - this will kill lower RAM too because lower RAM needs -5v supplying before ... -
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…
many thanks for the quick reply. The pwr supply is fine so i guess its one of the lower ram chips. -
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…
... have tested resistances on the ram chips, and am not convinced ... (pin 2 on all the lower ram chips is showing 7K or ... -
Diagnosing Spectrum 48k (faulty RAM chip?)I have a Spectrum 48k (I believe it may be an upgraded 16k model) that doesn't work, and never has ever since the owner gave it to me. When you turn …
... meter.
Without -5V the lower RAM will 'depart' very soon, getting ... -
using ic/chip holders ?advisable or not to put them in an original spectrum? I mean to save soldering in the future, if I'm gonna be having the machine fixed. I saw them …
... .
I guessed the lower ram would be fine to do ... -
using ic/chip holders ?advisable or not to put them in an original spectrum? I mean to save soldering in the future, if I'm gonna be having the machine fixed. I saw them …
... half of the lower RAM, test, then rest of lower RAM (and test).
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…
Whenever that's happened to a machine of mine, it's always been one or more lower RAM chips failing.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…
... find out if its a lower ram chip are there similar threads ...just thinking about ...compo for zx 16k ? anyone ?
... Contention Competition, since all the lower RAM is contended. Don't see ... of ULAplus is that the RAM requirement is no bigger than ...just thinking about ...compo for zx 16k ? anyone ?
... Contention Competition, since all the lower RAM is contended. Don't see ... of ULAplus is that the RAM requirement is no bigger than ...When would you use LD A,R ?Can anyone tell me a practical use of LD A,R and LD R,A I am confused when you would need to use it? Cheers
... is checksum a chunk of lower RAM in whatever state it was ... in on power up (RAM doesn't start set at ... it down). The chunk of RAM that I use is the ... if setting a chunk of RAM to 0xFF, then doing a ...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…
would i get an electric shock if i touched lower ram chips why speccy is turned on?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…
I'd still put money on it being lower RAM. (I've replaced plenty of faulty lower RAM chips, but never found a hot one).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…
... it being lower RAM. (I've replaced plenty of faulty lower RAM chips, but ...just thinking about ...compo for zx 16k ? anyone ?
... I register:
In RAM > 32768: doesn't exist ... don't want...
In lower RAM: gives you ULA snow.
zx spectrum +High i bought a spectrum + a while back that endend up that it didnt work.. the screen was just a scramble of colours..ive change the ktc(ztx650) and…
Almost certainly dead lower RAM (if the internal power supply ever fails, and the -5v is not present, the 4116 chips tend to die - indeed, there is a warning about this in the 4116 datasheet).zx spectrum +High i bought a spectrum + a while back that endend up that it didnt work.. the screen was just a scramble of colours..ive change the ktc(ztx650) and…
is it possible to test any of the lower ram with just a volt meterTest single ram chips?Is it possible to test single ram chips? Micky
... on that cart. bypass the lower ram , enabling testing.
[url ...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 …
... or ULA to access the lower RAM, but they have worked for ... 'actual' access time of the lower RAM that is required for the ...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 …
... 'actual' access time of the lower RAM that is required for the ...
