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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…
... bad solder joints on the +12v circuit, and excessive current ... consumption on the 12v line. Excessive current consumption ... will cause the +12v to sag. The proper ... current consumption on the 12v line is an exercise ... -
speccy 128 toastrack joysticksDoes the RS232 port (or the keypad port) work as a joystick port on the toast rack, and if so what 'system' is it...interface 2 or kempston? Secondl…
... , meaning they give +/-12V out, and expect +/-12V in. Then they're ... -
Using a Spectrum in JapanHi all, at the moment I have a 48k Spectrum on its way (with a LOT of other stuff) to Japan where I intend to use it. So I have some fairly straight…
... adapter provides the +5V and +12V that the above models need ... . The -12V isn't really necessary, because ... -
Using a Spectrum in JapanHi all, at the moment I have a 48k Spectrum on its way (with a LOT of other stuff) to Japan where I intend to use it. So I have some fairly straight…
... they use +5V @ 2A, +12V @ 700mA, and -12V @ 50mA.
So ... -
Multiface 128 Disassembly questionI was looking at a disassembly from a Multiface 128 rom, now I'm not a coder so I have a question, am I correct in understanding the code starts at #…
... the bus. (Also a simple ripple priority scheme can be implemented ... -
PSU for + AND +2 for saleHi all. as I live in Canada now, I cannot use either of my UK(240 Volt) power supplies. I'm over in the UK right now, so can post these 2 out to …
... on the end giving +5V, +12V and -12V supplies). -
Help - no tv receptionHi I've just bought a 128k Spectrum +2 from ebay & am having trouble getting any output on a tv. The specy seems to work - the power light comes on …
... inverter circuit that generates the +12V line inside the machine. The ... PAL encoder chip (TEA2000) requires +12V to operate, resulting in the ... the external power supply provides +12V. -
Help - no tv receptionHi I've just bought a 128k Spectrum +2 from ebay & am having trouble getting any output on a tv. The specy seems to work - the power light comes on …
I think the +12V is still needed for RGB ... a bad connection on the +12v line, and whenever it goes ... -
Help - no tv receptionHi I've just bought a 128k Spectrum +2 from ebay & am having trouble getting any output on a tv. The specy seems to work - the power light comes on …
... =Winston;360940]I think the +12V is still needed for RGB ... a bad connection on the +12v line, and whenever it goes ... continues to work if the +12V line is down. Just the ... -
computer wisdom neededany ideas? my computers dying, yesterday my computer developed a fault whereby itd keep freezing up, it did it on my XP and ME partitions and even o…
... giving out excess voltage/amperage ripple this can also cause problems ... -
Reading from the 128 Serial PortDon't shout at me if this is a silly question. I have Googled extensively, and searched the forums, but I can't find anything discussing what seems t…
... /> | 5 | 7 | CTS |
| 6 | | 12V |
+---------+---------+--------+
[/SIZE][/FONT][/CODE ... -
not much gear and absolutley no ideaIm looking for some help with two spectrums that i have just dug out of storage and are both unfortunatley faulty. I had always regreted that during …
... - +5v, -5v and +12v. The -5v and +12v is supplied by the ... -
computer wisdom neededany ideas? my computers dying, yesterday my computer developed a fault whereby itd keep freezing up, it did it on my XP and ME partitions and even o…
... have up to four independent 12V rails. A cheap but reputable ... brand PSUs have just one 12V rail. I don't need ... -rail PSU design means the 12V can go wherever it's ... -
power supply questionHi all, got my +2 ( Grey) back home to Canada. monitor should display ok, and I have a power supply I think will work. specs are : Input 120 V…
I use a C64c supply with a homemade adapter to take the 9v for my +2 at the moment, its rated as 1.7A at 9v (really 10.1v). Works very well.
My +3 power supply doesn't have a 9v output, only +-5 and 12v. -
Black screen of deathI recently aquired a zx spectrum (revision 3b) of the rubber key variety. it was all running smoothly(for about an hour after pluggin in), i left the…
In general "no video but keyclicks" suggests absence of 12V.
This voltage is generated inside the Spectrum, together with -5V for lower memory. Absence of these voltages might (will) damage lower memory. -
Black screen of deathI recently aquired a zx spectrum (revision 3b) of the rubber key variety. it was all running smoothly(for about an hour after pluggin in), i left the…
... but keyclicks" suggests absence of 12V.
This voltage is generated ... -
Black screen of deathI recently aquired a zx spectrum (revision 3b) of the rubber key variety. it was all running smoothly(for about an hour after pluggin in), i left the…
... red on the pin for 12v.
Also search this ... -
No picture on my LCD monitorHi all, more tech help required. I have my + 2 powered up ok. but when I run the yellow RCA lead from TV out to my convertor box I get no pict…
Pin 1 (comp video) and 2 (ground).
Note that the +2A/+3 has 12v on pin 1, which is why gasman warned you about +2 only ;-) -
Writing to the screen from a bufferI?m designing a game and am spending a bit of time trying different ideas before I commit my self. I?m currently thinking of writing data to a buffer…
... you want to see the ripple effect.
Oh, and ... -
48k + Power supplyHi, Anyone know where I can get a replacement PSU for the 48k Plus? Nothing on Ebay at the minute. Looks like the end is Imminent for my one! Tha…
Interface One - New FunctionalityAs you may (or may not) be aware the Interface One is a pretty powerful piece of kit. One of it's greatest features is being able to easily extended …
... to be daisy chained, a ripple priority scheme could have been ...Interface One - New FunctionalityAs you may (or may not) be aware the Interface One is a pretty powerful piece of kit. One of it's greatest features is being able to easily extended …
... ROM very easy - implement a ripple priority scheme (easily done and ...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…
... that provides the -5v and +12v lines to these chips has ...Broken ZX Spectrum? :(Hi! I bought a 2nd hand ZX Spectrum half a year ago. It worked perfectly fine when I first tried it. I put it back in its box which it was sent in, …
... your Spectrum doesn't have +12v or -5v used for video ...Broken ZX Spectrum? :(Hi! I bought a 2nd hand ZX Spectrum half a year ago. It worked perfectly fine when I first tried it. I put it back in its box which it was sent in, …
... your Spectrum doesn't have +12v or -5v used for video ...Broken ZX Spectrum? :(Hi! I bought a 2nd hand ZX Spectrum half a year ago. It worked perfectly fine when I first tried it. I put it back in its box which it was sent in, …
I have to ask - what kind of Spectrum? Rubber key, 128K, or one of the Amstrad built models (+2 or +3)? If the latter if the PSU is not supplying 12v you will get a black screen with hints of activity.Broken ZX Spectrum? :(Hi! I bought a 2nd hand ZX Spectrum half a year ago. It worked perfectly fine when I first tried it. I put it back in its box which it was sent in, …
... the PSU is not supplying 12v you will get a black ...Broken ZX Spectrum? :(Hi! I bought a 2nd hand ZX Spectrum half a year ago. It worked perfectly fine when I first tried it. I put it back in its box which it was sent in, …
... your Spectrum doesn't have +12v or -5v used for video ...Broken ZX Spectrum? :(Hi! I bought a 2nd hand ZX Spectrum half a year ago. It worked perfectly fine when I first tried it. I put it back in its box which it was sent in, …
... do. The Spectrum generates +5V, +12V and -5V from the 9V ...
