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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 (…
... enough stable power supply of +12v, maybe because those ceramic ICs ... -
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 (…
... to suggest the +12v line seems wrong - the 12v line in my ... -
Another set of USA newbie ZX Spectrum questions.So yeah, I'm considering getting a ZX Spectrum 48k pretty soon, but since I'm not in the country of origin, I have a few questions about it. First, …
... used by the +2A. The -12V aren't necessary unless I ... -
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 …
I've just measured the internal voltages as per the service manual on this site, and both points that are supposed to be 12V actually measure around 10V - would this be the cause of my problem? Which component is to blame? -
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 …
... mode supplies). You should have +12v, +5v and -5v available on ... -
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 …
... would be missing (and the +12V a little too low)? -
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 …
... ).
The lower-than-12v suggests that something is loading ... -
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 …
... =Winston;398708]The lower-than-12v suggests that something is loading ... -
Alternative power supply for a +2B?Hi friends, On impulse, I recently bought a ZX Spectrum +2 (unit only, untested) on eBay, thinking that the cables (specifically the power supply) o…
... br /> The +2B needs +5V, +12V and, if memory serves me ... well, -12V. The only critical voltage here ... is +5V. +12V is used to feed the ... the RS232 line converters. -12V is used for RS232 ... power jack to take +12V also from the monitor, ... -
Alternative power supply for a +2B?Hi friends, On impulse, I recently bought a ZX Spectrum +2 (unit only, untested) on eBay, thinking that the cables (specifically the power supply) o…
the CD32's PSU is +5v/+12v/-12v definitely needs to hack the (DC) socket...
the C64's PSU is +5v/9v-AC not suitable for any speccy.
chris -
Alternative power supply for a +2B?Hi friends, On impulse, I recently bought a ZX Spectrum +2 (unit only, untested) on eBay, thinking that the cables (specifically the power supply) o…
Hmmmm, I've found I also needed the +12V to get an RGB display on my +3 - my PSU had a bad connection on the 12V line, and every time it died, so did the display (although the rest of the computer - except the floppy drive - continued to work). -
Alternative power supply for a +2B?Hi friends, On impulse, I recently bought a ZX Spectrum +2 (unit only, untested) on eBay, thinking that the cables (specifically the power supply) o…
Yes, -12v is also required to power the floppy drive. That's the reason for the -12v 700mA required in +3 power source (vs 200mA in +2A).
Why not using a "hacked" PC power source? -
Alternative power supply for a +2B?Hi friends, On impulse, I recently bought a ZX Spectrum +2 (unit only, untested) on eBay, thinking that the cables (specifically the power supply) o…
... found I also needed the +12V to get an RGB display ... /> I can't see why 12V is really needed to form ... picture... unless your TV needs 12V from the RGB DIN socket ... -
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 …
... read a value of 680 mV for one of the Spectrum ... -
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 …
... chip needs -5V, +5V and 12V and a common fault is ... that creates the -5V and +12V supplies fails. There are instructions ... -
need help with +3 sound mod..well my friend has been doing the mod.. and well informed me the info / instructions aren't 100% there.. basically the matrix of cap's / resisters i…
... already use one to supply 12v for my RGB->SVIDEO ... -
Spectrum +2A -Black screen-When I turn on the power I get only black screen (full size) PSU is working (I even tried with my +3 PSU) RF-cable is working. What could be the pro…
Are you getting the right voltages from the power supply? If the 12V is absent, you'll get a black screen. -
Spectrum 48k - Many ProblemsHi, I'm new to the boards and to owning a Spectrum, and sadly, it doesn't work properly. I'd been using an emulator for a while but I decided I'd lik…
... these chips (+5v, -5v and +12v). If the -5v supply has ... -
Spectrum 48k - Many ProblemsHi, I'm new to the boards and to owning a Spectrum, and sadly, it doesn't work properly. I'd been using an emulator for a while but I decided I'd lik…
48K needs the internally generated 12V to produce video. -
ZX Spectrum Power SupplyHi All, I've come across a power supply that is currently registering 14.5v before it is plugged into the Speccy. I have another one that registers…
... necessary. ;)
The nominal 12V input is a "sweet spot ... -
zx spectrum 128K+2(gray)-vanishing colorsHi, I just got "new" zx spectrum 128k+2(gray) made in uk version. Beside tape dead and memory issue - only first 16k RAM works in 48k mode, it has s…
... colors can be TEA2000 or... +12V line issue. But I'm ... -
ZX Spectrum Power SupplyHi All, I've come across a power supply that is currently registering 14.5v before it is plugged into the Speccy. I have another one that registers…
... produces -5v and +12v for the ram, and +12v for the Colour ... run a speccy off a 12v car adapter (The car wasnt ... -
PSU unit spectrum 128k +2b 6 pinout DINHello everybody! I have spectrum 128k +2B but I don't have the 6 pin PSU and I can't find it anywhere. Can you anyone tell me where can I buy this PS…
... adapters don't have the -12v, it's not absolutely necessary ... . I think the -12v is only needed for rs232 ... -
PSU unit spectrum 128k +2b 6 pinout DINHello everybody! I have spectrum 128k +2B but I don't have the 6 pin PSU and I can't find it anywhere. Can you anyone tell me where can I buy this PS…
... use different voltages (5V and 12V). How can I use a ... -
PSU unit spectrum 128k +2b 6 pinout DINHello everybody! I have spectrum 128k +2B but I don't have the 6 pin PSU and I can't find it anywhere. Can you anyone tell me where can I buy this PS…
Can I take the cables of a 24 pin connector from a PC PSU like this [url]http://pinouts.ru/Power/atxpower_pinout.shtml[/url] and connect the +12V,+12V,-12V,5V,GND cables to the 6 pin connector? thanks -
PSU unit spectrum 128k +2b 6 pinout DINHello everybody! I have spectrum 128k +2B but I don't have the 6 pin PSU and I can't find it anywhere. Can you anyone tell me where can I buy this PS…
... .shtml[/url] and connect the +12V,+12V,-12V,5V,GND cables to the ... -
PSU unit spectrum 128k +2b 6 pinout DINHello everybody! I have spectrum 128k +2B but I don't have the 6 pin PSU and I can't find it anywhere. Can you anyone tell me where can I buy this PS…
But the +12V of the PC PSU works @12A +5VDC @25A . Wont the intensity of corrent blow with the spectrum?
Spectrum actually works with +12V @ 0.7A and +5V@ 2A, it's very lower.