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zx spectrum +2A power supply missing -12v voltshey.. i'm looing at a zx spectrum +2A power supply that the -12v rail seems to be missing .. it has the 12 volts and 5 volts .. it is the version wit…
... missing .. it has the 12 volts and 5 volts .. it is the version ... happens and goes to the 5 volt and -12v rail ,,, confused ... -
Where shall I start to look ?I got hold of a faulty 48k, Issue 6. It displays a picture like shown below: [URL]http://www.gjelberg.no/miscpics/speccyfault.jpg[/URL] Some of the…
... every second.
+5 and -5 volts are present.
I also ... -
+3 PSU PoorlyI have a +3 that just stopped working. Its the psu thats gone and opening it up discovered a blown fuse. After replacing the fuse it still doesnt wor…
... still doesnt work. Theres no +5 volts at the connector and have ... -
Spectrum 48K input voltageI have a power supply that is rated 9,5 Volts DC. With no load it outputs about 9,86 Volts. Is it safe to use it for ZX Spectrum 48K? (it can do …
I have a power supply that is rated 9,5 Volts DC.
With no load it outputs about 9,86 Volts.
Is it safe to use it for ZX Spectrum 48K?
(it can do over 2 Amperes) -
Analogue BeeperThere's been a discussion on foro.speccy.org about multichannel beeper stuff, and since I had the camera out and the scope set up, I set about demons…
... , the output of BEEP 10,5 - note that it's not ... /> The amplitude is about 2.5 volts. Now on the same voltage ... amplitude is only about 0.5 volts here.
Not a ... -
Broken keyboard due to broken ULARecalling csmith's thread about dead ULAs, a thread appeared in the Zonadepruebas (Spanish) forum regarding... a dead ULA, but only a partially dead …
... is a tristate buffer, 5 bits wide. Going into ... blue cable, the power (5 volts and ground). With the ... the keyboard lines at +5 volts (logic 1), and this ... ULA keep these pins at 5 volts.
To ... PIN 4 = A0;
PIN 5 = KB0;
PIN 6 = ... -
Two-resistor fix for +3 sound distortionOver at Zonadepruebas, mcleod_ideafix has done a circuit analysis of our favorite distorted sound output: the issue 1 +3 AY chip sound output, and fr…
... circuit is powered by a 5 volt supply. After simulating ... the mid point is 2.5 volts, I opted to make it ... a little higher, at 3 volts. So the "zero" signal ... is at 3 volts. The maximum the signal can ... we need, compared with a 5 cent coin (same size ... -
ZX81 internal RAM board?Just a quick question to Zorn (amongst others). What would the issues be with fitting one of Zorn's RAM boards into an unexpanded ZX81? Seems to me…
... Zorn's board only needs 5 volts, I'm wondering how easy ... -
Issue 1 oddityHello to everybody, I have a very first under my hands - a broken Issue 1. Apart from the classic "broken lower RAM" syndrome which will be easily t…
... ) shows a tad over 4.5 Volts, just as other correctly working ... -
Auto fire joysticks on spectrum +2 grey?Sorry if this has been asked elsewhere.. Autofire joysticks that require +5 volts on pin 7 will not work of course, but what would happen if a…
... />
Autofire joysticks that require +5 volts on pin 7 will not ... -
zx spectrum +2 no clock signal ??help me ...... looking at a specie +2 (original +2) it is the Z70700 issue 1 (uk one) i seem to have no clock,no display,no sound at all. it is sho…
... at all. it is showing 5 volts from the reg and 12 ... volts on the tea 2000 (well ... -
Programming Sound EffectsHi guys, Have decided, probably due in some way to my midlife crisis, to tart up and re-release (or even just re-lease) the old 48K Speccy games I w…
... ofcourse the value off 6.5 bits.
When you had ... earsocket read at 0 and 5 volts.
So thats a 1 ... -
Any other real Spectrum users in the USA?Hi, I bought a Spectrum +2a off e-bay (I collect old computers) and managed to make it run here in the US. I'm curious; is anybody else running an a…
... power requirements are +12, +5, and -12 volts, it'll actually work ... off of just +5. The -12v ... with providing it just the 5 volts. It has to be regulated ... -
Which expansions can I attach to a +2A?I have several peripherals that I would like to connect to a +2A: an Interface 1 with Microdrive, a +D disk interface and kempston joystick interface…
... that pin is connected to 5 volts the internal ROM chip is ... -
Woody?s Tape2wav tested[quote] I've uploaded a new version of Tape2WAV to the same URL as given above. Any chance of giving this version a quick test? [/quote] Hi Woody, …
Noisy 2A displaymy 2A gives a fairly good display until it has to generate sound or other cpu work, which interferes with the signal, giving some "cloudy" effects …
... well over 20 AMPS at +5 volts - you can weld (albeit badly ...Joystick compatibility on the +2AHey folks, now my +2A is working, I decided to find some more problems (not really...I didn't "decide"! :( ), basically the joysticks won't work prop…
... . You can get +12 or +5 volts from 2 open via's ...I dont know what I want this Christmas?Any ideas on what I should ask for this christmas, my wifes asking me and I haven't a clue. I think a Wii is out of the question as I finances are t…
Um no thanks I can think of better things to do with 5 Volts than that. :DJust got a Spectrum +2BThis is the first Spectrum I've ever used or owned. I got it without a video cable or power supply. I wired up a proper video cable, and I altered an…
Or this : LM323K, which gives 5 Volts and 3 ampsAV CableI have purchased an AV Cable for my Sega Mega Drive. Since it has a 5 Pin DIN connector, which fits into the 8 Pin DIN socket, I presume it will wor…
... on a megadrive may be 5 volts, Pin 1 on a spectrum ... .g. green signal a nice 5 volt connection or a ground ...5v Transformer.I've got a 5v 3A transformer, would this be ok to use with two 3.5 inch floppy drives?
... 'll get a rock steady 5 volts out even if the power ...ZX Spectrum 128+ problemsHello!I recently purchased and got myself a spectrum 128+ from ebay.The item did not have an original power supply so i got a power supply of 9volts …
... put out something like 12 volts (the supply is labelled 9v ... supply put out 12.75 Volts. This why i bought an ... and switched to 7.5 Volts output.
7.5 V is sufficient ...Poorly Spectrum + Fault diagnosis help needed!Hi, I've got a Spectrum+. Sometime in the past I broke it and sent it off to be fixed. It came back working good as new, but with an issue 2 board i…
... 1: Should show -5v (MINUS 5 volts)
Pin 8: Should show ...Voltage SchmoltageOk then. Don't flame for wanting to use a C64 tape deck for this - it was the only one I have to hand which may be cannibalised for the purpose. So …
Could you not get power from a USB connection??
I know USB power is only 5 volts though, I dont know if that will that present a major problem?
Andrew.Input/Output on Edge ConnectorI would like to sense a pulse on the data bus via the edge connector, i.e. on or off. How do you decide what port it is on? I would also like to send…
... . +5 volts is logic 1, 0 volts is logic 0. M1 is high (+5 volts ...Input/Output on Edge ConnectorI would like to sense a pulse on the data bus via the edge connector, i.e. on or off. How do you decide what port it is on? I would also like to send…
One thing you might want to do, then, is get hold of some breadboard - and a collection of 74-series logic, and a 7805 regulator (so you can get 5 volts), a bag of 50 or so 5 volt LEDs and experiment for a bit. You'll find it very instructive.Which controller do you use with your emulator(s)?Pleasantly surprised that my Xbox 360 wired gamepad works in quite a few games via Spectaculator, where Kempston is an option. Never was a fan of pur…
... , it just plugs into the 5 volts and guzzles the lovely electricity