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Need help on a PSUI want one of these to go with a speccy 48: [url]http://cgi.ebay.co.uk/NEW-ZX-SPECTRUM-POWER-SUPPLY-PSU-16K-48K-SINCLAIR-/170630125650?pt=UK_VintageC…
... circuitry 'chopped' out by the mod would lead to a higher ... composite mod has no effect or dependence whatsoever on the power supply ... plugged in, it's all powered from the internal power ... -
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…
... 4116's are a big power drain, 64kx1 DRAM's ... better but a single low power SRAM (43256 -LL type ... ) is best if minimum power is your goal. Btw ... 5v->12v chip to power that.[/QUOTE]
The ... do without the voltage conversion circuit (no need to remove, ... -
RGB to S-Video and Composite Adapterif I produced a dongle that generated composite and s-video from the RGB socket on +3 and Black +2 spectrums would anyone be interested? I'm thinkin…
... mean that without having to mod your speccies you have the ... speccy. I have built a circuit, and it works, but it ... -
RGB to S-Video and Composite Adapterif I produced a dongle that generated composite and s-video from the RGB socket on +3 and Black +2 spectrums would anyone be interested? I'm thinkin…
... RGB signals too... I suppose power for the device could be ... larger and more complicated the circuit the more rapidly the whole ... -
RAND USR that doesn't work in emulators and clonesEons ago, I "discovered" a strange RANDOMIZE USR. This is it: [b]RANDOMIZE USR 46578[/b] Using it on a genuine ZX Spectrum rubber key or Plus model,…
... all registers to $FF at power on. What happens when I ... happens when I power on the machine: an RC circuit pulls down ... the reset button while I power on the machine, hold the ... -
RAND USR that doesn't work in emulators and clonesEons ago, I "discovered" a strange RANDOMIZE USR. This is it: [b]RANDOMIZE USR 46578[/b] Using it on a genuine ZX Spectrum rubber key or Plus model,…
... line is *not* invoked on power-up.[/QUOTE]
power on the machine, and ... can think about a power-cycle startup (the ... is to assume that at power on, all registers contain ... registers), then the RC circuit pulls down RESET causing ... -
RAND USR that doesn't work in emulators and clonesEons ago, I "discovered" a strange RANDOMIZE USR. This is it: [b]RANDOMIZE USR 46578[/b] Using it on a genuine ZX Spectrum rubber key or Plus model,…
... "cold start" refers to a power cycle (Spectrum OFF, then ON ... . Nevertheless, both the RC reset circuit and the reset user button ... a couple of minutes without power.
[B]Zilog ... these values also differ every power cycle applied to the machine ... -
128 Toastrack power supplyHi! Should Toastrack work with rubber key Spectrum power supply or does it need it's own one? Is Toastrack RF modulator same as in rubber key model?…
... work with rubber key Spectrum power supply or does it need ... have it, and Composite output mod with modulator does not work ... -
ZX Spectrum + alive thanks to this site.I was given a dead unit several months ago. I finally had time to look at it yesterday. Using the repair guide on this site the thing is now alive.…
... consider is the composite video mod. It improves the picture no ... it in or out with power on, you WILL kill your ... -
Composite spectrum problemHowdy, Found an old rubber key in a bag full of games recently which had seen better days. Rigged it up and to my suprise it worked! It needed som…
... working before you tried the mod?
The interference might not ... be because you botched the mod-job, but because there is ... recheck the mod step by step. Usually a short circuit wouldn't ... -
Variable resistorI have a problem with my speakers - the treble is much much too quiet in comparison to the bass. Or you could say, the bass is much to loud for the r…
... and resistors (active filters require power and consist of things like ... input impedance. Inserting a passive circuit in between is going to ... -
Variable resistorI have a problem with my speakers - the treble is much much too quiet in comparison to the bass. Or you could say, the bass is much to loud for the r…
... series in the high power part of the circuit -- the bit between ... the power amplifier and the ... condition required to deliver maximum power to the speaker, making ... these two things so your circuit looks like:
[ ... -
ZX Setup QuestionsHi guys! I have been reading around the forums and love what is goin on. Anyways I just got my first ZX Spectrum (16k, rubber keys, boxed and compl…
... simple..do the composite mod on this site, plug ... them all, the composite mod gives a FAR better ... speccy with the composite mod running on my Visio ... off the shelf 2A 120V power supply I'm using). ... speccy+ with the composite mod and changed crystal running on ... -
Variable resistorI have a problem with my speakers - the treble is much much too quiet in comparison to the bass. Or you could say, the bass is much to loud for the r…
... series in the high power part of the circuit -- the bit between ... the power amplifier and the ... condition required to deliver maximum power to the speaker, making ... these two things so your circuit looks like:
[ ... -
Stereo AY Spectrum availabilityGood morning to all and sundry on this (wet?) Friday morning! I was wondering available ARE stereo spectrums? As far as I'm aware, in the normal rea…
... a protoboard version of that mod. I think it's ... . Prior to do this mod, you have to isolate ... />
Inputs for this circuit: CH. A, B and C ... Speccy.org forum did this mod. Here you have some ... location chosen for the stereo mod board:
[img]http ... -
48k to 128k upgrade - problemsHi friends! I built 128k upgrade according to the [url]http://hw.speccy.cz/128krebuild.html[/url]. After I powered on my Speccy it said hello with s…
... ;-)
Anyway, this 128k mod is really nice and easy ... ;]
I did this mod on my Speccy 48k+ issue ... from one series, removed -5V circuit, replaced CPU (and I will ... -
Souping up my Spectrum+ 128k ToastrackI wrote a small piece on the various things I've been doing to my ZX Spectrum+ 128k toastrack, primarily getting it working with the bright output an…
... , but the reactance of the circuit (mostly capacitance) it's in ... AY was done in this mod though, I confess to not ... ) sine wave from the beeper circuit by exploiting its reactance (effectively ... analogue waveforms with the beeper circuit. This is how SA-CD ... -
Better or Worst! Speccy vs C64Just wanted to see what games you all thought looked better or played better on the Speccy or the C64? I always thought that Renegade & Target Ren…
... Apocalypse, Grand Prix Circuit, One on One, Pinbal Power, Commodore soccer and ... -
Better or Worst! Speccy vs C64Just wanted to see what games you all thought looked better or played better on the Speccy or the C64? I always thought that Renegade & Target Ren…
... Train, IK +, Uridium, Grand Prix Circuit, Winter Games, Commando, 3d Tennis ... /> [QUOTE=Pegaz;562076]Pinbal [sic] Power[/quote]
A pretty poor ... -
Is this pure bulls@*t or what?Read [URL="http://www.ebay.co.uk/itm/SINCLAIR-ZX-SPECTRUM-PLUS-48K-REFURB-COMPOSITE-OUT-/170691876340?pt=UK_VintageComputing_RL&hash=item27be0755f4#h…
... ULAs doing the composite mod on those..so I' ... circuits added when making the mod.
The ... turned into composite by a circuit external to the ULA, ... a circuit with another IC (LM1889) ... amplifier. There's no mod (short of a ridiculously ... -
Is this pure bulls@*t or what?Read [URL="http://www.ebay.co.uk/itm/SINCLAIR-ZX-SPECTRUM-PLUS-48K-REFURB-COMPOSITE-OUT-/170691876340?pt=UK_VintageComputing_RL&hash=item27be0755f4#h…
... circuits added when making the mod.
The Spectrum is ... turned into composite by a circuit external to the ULA, a ... circuit with another IC (LM1889) and ... collector amplifier. There's no mod (short of a ridiculously high ... -
Is this pure bulls@*t or what?Read [URL="http://www.ebay.co.uk/itm/SINCLAIR-ZX-SPECTRUM-PLUS-48K-REFURB-COMPOSITE-OUT-/170691876340?pt=UK_VintageComputing_RL&hash=item27be0755f4#h…
... .
4-Has the composit mod fix - which means no fiddling ... a "bonus":
-Tested Power Supply
-Tape leads
should be:
-Power supply in great condition, solid ... -
Does the usual composite mod damage Speccies?Hi people, Just browsing eBay -as you do - and I noticed this auction: [url]http://cgi.ebay.co.uk/ZX-SPECTRUM-48K-GOOD-COND-COMPOSITE-OUTPUT-SINCLAI…
... of lcds, the regular composite mod is not a real option ... one thing, but building a circuit without any deeper knowledge in ... -
Gauging interest: ZX EvolutionHi everyone. First of all I would like to introduce myself, since this is my first post. My name is Conrad, I'm from Vancouver, BC, Canada, and I hav…
... also the NeoGS General Sound/MOD/MP3 sound card and the ... /> * MicroITX board, 2 ZXBUS slots, power ATX or +5,+12V;
mod reading this can you possibly ... -
DivIDE - HELP NEEDED PLEASE!Hi, I managed to get a DivIDE, however I can't seem to get it working as it doesn't seem to be able to "find" the games on my card. I would really …
... about it, I guess this mod is the best solution...
circuit board into the shell of ... -
Requesting a little help to identify the purpose of this 'add-on' to my Issue 2Hi everyone First of all it's my first post here so please go easy on me! I'm grateful to be accepted into your fine little club :smile: I probabl…
... I've soldered 29 wire mod chips to old Xbox's ... , several magnifying glasses of various power, some helping hands, etc, etc ... -
Requesting a little help to identify the purpose of this 'add-on' to my Issue 2Hi everyone First of all it's my first post here so please go easy on me! I'm grateful to be accepted into your fine little club :smile: I probabl…
... /> I also did the composite mod whilst I was at it ... .com/cmonkey/composite.jpg"]Composite mod[/URL]
The difference ... it 15 times, with a power off restart in between each ... -
black +2 go awayHi, All what is my problem if i have the proper voltages inside my black Spectrum +2 black (+5v+12v) in all the important IC's , and not have any vi…
... /> @Zetr0 i have -12 from power supply i not look where ... with sound ..i have small mod to get and composite video ... -
Second Hand SpectrumHi just joined the Forum. I have picked up a Spectrum at a s/h shop and would like some advice please. I have had two ZX81's packed away for severa…
... by the time taken to power up, but you need ... came with the original power supply which indicates that ... 9v DC however the open circuit (no load) voltage is ... a external 5v (I think) power source.
Q. Would ... reg) and also the power unit was running hot.
Second Hand SpectrumHi just joined the Forum. I have picked up a Spectrum at a s/h shop and would like some advice please. I have had two ZX81's packed away for severa…
... QUOTE=mcnaugg;574626]Your composite mod sounds interesting, I would be ... 11/zx-spectrum-composite-video-mod.html"]womblesretrorepairshack.blogspot.com/ ... /11/zx-spectrum-composite-video-mod.html[/URL]
power the video part. Fully ...
