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48k PSU UpgradeCan anyone give the definitive word on a PSU upgrade (rather than just a replacement) for 48k machines? I'm thinking of adding at least an IDE inter…
... load for an 48K Spectrum in factory state, but ... the headroom on +5V line you have left for ... [I]output[/I] capacity] - [Spectrum's base load].
Spectrum, I think. But [ ... check [I]exact[/I] part no., physical package & size ... -
+3 PSUHiya. Having moved house 3 times since using my +3, I appear to have lost the power supply. I don't suppose anyone has a spare they would like to s…
No, but I have just built ... and label +12v +12v -12v +5v +5v GND POWER_ON wires on the ... are correct and there are no shorts. (I shorted out a ... br /> 7) Plug Din into spectrum, molex into the pico PSU ... brick into Pico PSU. Test spectrum works.
8 ) Make some ... -
Sending key presses to the spectrumfor a project I want to send automated keyboard presses to the ZX via a micro-controller. Is it possible to send these through the expansion slot? …
... outputs without pullups (because the Spectrum has already pullups for these ... will be able to handle 5V inputs.
[code] ... when the row the Spectrum is reading is no longer the one ... your device only with the Spectrum running the ROM keyboard routine ... -
(Re) building a ZX Spectrum laserharpThe Cambridge show is nearing, and I want to bring my laserharp with me. Why? Because it's built around a ZX Spectrum +2: [IMG]http://benophetintern…
... off automatically when there is no movement in the laser.< ... 0..5V, created by a DAC inside the ZX Spectrum; this ... to zero when there is no new load.
This ... to 0V when there is no input change, dispite the ... becomes 0V when there is no change in voltage from ... -
SPECTRA New from Paul FarrowLooks good! Read about it [URL="http://www.fruitcake.plus.com/Sinclair/Spectrum/Spectra/SpectraInterface.htm"]here[/URL]
... 's based upon a 5V FPGA which is no longer available, and ... uses to synxhronize with the Spectrum.
- It is not compatible ... -
Zx 48k after the ic7805 other problemHi everyone, i am Tiago from Portugal, and i am trying to repair a Zx Spectrum 48K. the machine didn't do anything, no image, no sound, nothing. The…
... and 1?F at the -5V. If there is a capacitor ... . If there is no TR4 in the Spectrum then at the 12V ... line there should be more than 5V ... -
SPECTRA New from Paul FarrowLooks good! Read about it [URL="http://www.fruitcake.plus.com/Sinclair/Spectrum/Spectra/SpectraInterface.htm"]here[/URL]
... based upon a 5V FPGA which is no longer available[/QUOTE ... (4 permutations).
Spectrum games have historically often been ... 've recoloured all existing Spectrum games you are interested ... impression you had left the Spectrum scene never to return ( ... -
My +2 Guinea PigA grey +2 I bought to perform my experiments on, it's had it's ROM replaced with a 27C256 with Open SE Basic onboard, combined with the Gosh Wonderfu…
... key presses to the spectrum[/URL] thread which I ... together with the following (no doubt awful) code I ... keypress test for the ZX Spectrum keyboard
// header ... of the expander to 5v with a 10k resistor< ... #9 of the expander to 5V (power)
// Connect ... -
WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…
... #1[/B][/SIZE]
No video output at this moment ... want to stress the non 5V tolerant inputs yet)
[img ... " when pressing keys with this Spectrum.
[B]Winston: this ... -
PLEASE HELP!! DEAD SPECTRUM!!Sad News!!! I have a spectrum issue 5 board and I'd done the general composite mod which was great and it worked with a divIDE plus (RWAP) and esxDO…
... and I think, maybe the +5v is touching the bottom case ... copperside up instead so theres no chance of the components touching ... , I need to fix my spectrum and try to eliminate these ... -
Semi-Dead Spectrum - Help RequestedI have finally got my hands on my two old Spectrums - neither of which work, but ideally I hope to get both of them working again. Spectrum number o…
... occurs. For example, does the 5V supply line dip because a ... can make a Spectrum prone to resetting itself for no other good ... -
semi dead speccy 48k who can helpHi forum , i am busy recovering a 48 k speccy issue 3 board unit. With the help of a more experienced spectrum user from the uk , i managed to get…
... ,
I got the spectrum long time ago becouse it ... />
There is no connection between pin 1 ( 5v ) and pin 28 ... one , and powered up the spectrum .
It displays the ... -
Help me resurrecting a 128KHello to everybody. I'm really struggling along a repair of a standard 128K a friend of mine handed me over some (ok, actually a lot of) time ago. A…
... (ULA pin 4) stuck to +5V. I can't see a ... , but I just did it, no excuses. And, worst of all ... hidden bridge between A0 and +5V. Very thin and exactly over ... were fixing a standard 48K Spectrum, as this is what I ... -
ZX Spectrum problemsHello Everybody, I am new here, and I need some help in my ZX repairs : - I have a ZX Spectrum 48k board (issue 2) which power up but remains stuck o…
... .
As for the Spectrum+: +5V supply should be a direct ... are normally soldered in (read: no IC socket contacts to worry ... -
Another cause for DivIDE problems on 48K'sThe last months some topics were opened to discuss problems with 48K ZX Spectrums and DivIDE. Sofar we found: - Bad Z80's because of poor fanout (si…
The ROMCS pin at the Spectrum rear slot is not really ... 1, the ROM is unselected no matter the value is generated ... 0.7V) as at collector (5V), presenting a strong '1', overdriving ... the emitter suddently changes from 5V to 0V (i.e. when ... -
How far are we from a single-chip 100% ZX Spectrum compatible solution?I really like to read about the projects of some geniusses here on WoS who are working on their ZX Spectrum clones. IMHO some main steps that have b…
... think you could do a Spectrum on a chip* in a ... is available in TQFP, so no mucking about with BGA packages ... translation (3.3v-5v) given that no Spartan-6 is 5v tolerant.
PlusD mini - production startedI'm developing a PlusD clone, with some features stripped to make it very affordable. The real PlusD and German clone have an 7805 regulator, but I …
... 5v rail?
The worst case is the issue 2 Spectrum ... .[/QUOTE]
ZX Spectrum alone consumes 10W.
ZX ... Spectrum + DivIDE = 14W.
ZX Spectrum + original PlusD = ... consume some watts each, no problem for one 7805 to ...Altera CPLD vs Xylinx FPGAI will dig into the world of FPGA's, mainly to find something that can replace one or more GALs for my current and new projects. And it's never bad t…
... with the Spectrum. The Xilinx Coolrunner though is not 5v tolerant.
No current FPGA is 5-volt ... twice the resources of the Spectrum ULA).
Rough ... XC95288 - 288 macrocells - about 2 Spectrum ULAs.
It gets ...CAPS SHIFT on Spectrum+ ComputerI have just recently supplied a couple of replacement Spectrum+ keyboard membranes to a customer in Barby, Germany. Although something may have been…
... the keyboard interface of the spectrum that connect the keyboard with ... ... 4.7 kOhm to VCC (5V). This way the keyboard is ... /> Using that circuitry I have no more problems with high keyboard ...TKMEM - the 128K interface for 16K SpectrumsHello all! Here in Brazil, we have made a small production of an interface, totally based on Velesoft?s memory expansion ([url]http://velesoft.speccy…
[QUOTE=-Micky;674883]No way that it works in ... [/QUOTE]
Some ZX Spectrum boards have upper ram chips ... chips to +5V). If you have original ZX Spectrum 16kB then external ...The Disciple clone... doable?Hi. As a spectrum user in the 80's this was the dream interface all-in-one for me. I have a 48k+ and planning on get a 128K toast-rack later. Anyway…
... playing a good number of Spectrum games...) But I appreciate ... IC 27128
pin 22 (no label) from the +D corrected ... about the power 9V and 5v. The GND is labeled ... least I suspect) the 5V that goes to all the ... in how the various Spectrum and Z80 control lines ...The Disciple clone... doable?Hi. As a spectrum user in the 80's this was the dream interface all-in-one for me. I have a 48k+ and planning on get a 128K toast-rack later. Anyway…
... you mean, the power bus (5V-GND) is DC.
Do ... you can see that the Spectrum signals /RD, /RESET are in ... /CE. So there really was no external obstacle blocking the use ...Mouse systems for ZX Spectrum[U][B]Mouse systems for ZX Spectrum[/B][/U] Okay, I have been reading the [URL="http://www.worldofspectrum.org/forums/showthread.php?p=688449#post68…
... ][B]Mouse systems for ZX Spectrum[/B][/U]
[LIST]
no parity. You would need to ... kempston joystick port. it is 5V (TTL).RAM Diagnostic ROMhi all, i burn this ROM from here [url]http://www.fruitcake.plus.com/Sinclair/Interface2/Cartridges/Interface2_RC_New_RAM_Tester.htm[/url] and i a…
... the system. A program has no direct control of these control ... used in this model of Spectrum) is only one bit wide ... (ULA pin 4) stuck to +5V"+3 Audio hates me with a passionHihi Since nobody seemed to have a spare +3B board, I've been trying to replace the audio entirely, aiming for a speaker inside the machine Since p…
... 39K resistor connected between +5V and the base of the ... resistor is actually connected to +5V. Or it may be ... [URL="http://alistairsserver.no-ip.org/public/spectrum/+3sound/"]fixing the + ... m aware there is currently no actual physical documentary evidence ...+3 Audio hates me with a passionHihi Since nobody seemed to have a spare +3B board, I've been trying to replace the audio entirely, aiming for a speaker inside the machine Since p…
... [URL="http://alistairsserver.no-ip.org/public/spectrum/+3sound/"]fixing the +3 ... m aware there is currently no actual physical documentary evidence of ... sound as good as my Spectrum 128 ever since I got ... the collector terminal moved to +5V, and a new 12K resistor ...48k + Spectrum Issue 4S Display IssueHi all! Brand new user here. Growing up I had a zx spectrum for a little bit, and recently I have bought a working 48k + Spectrum (Issue 4). I was…
... etc.... [/QUOTE]
No problem, it is just hard ... the rectifying stage. And no doubt that more problems ... 12V (or -5V), and switching the Spectrum board on with ... coming up, the Spectrum should be switched off ... br /> Those who see no problem in desoldering a ...Composite video for 48k Capacitor orientationHello, My multisystem TV is acting up and I'm unable to navigate the menu to tune in the RF signal for my speccys. However the A/V input still works.…
... its collector. The capacitor lets no DC voltage to the collector ... the video circuitry of the spectrum from the video line to ... add (or change) capacitors between 5V and ground at the right ...48k + Spectrum Issue 4S Display IssueHi all! Brand new user here. Growing up I had a zx spectrum for a little bit, and recently I have bought a working 48k + Spectrum (Issue 4). I was…
[QUOTE=roko;696530]No problem, it is ... the rectifying stage. And no doubt that more problems ... +12V (or -5V), and switching the Spectrum board on with only ... not coming up, the Spectrum should be switched off ...
Those who see no problem in desoldering a chip ...Faulty 48K Issue 3 motherboardHi I have a faulty Issue 3 motherboard and would appreciate it if somebody can steer me in the right direction of where to begin with the fault find…
... switch-on. There are no other lines, etc, just ... /> - Check that it has +5v in Z-80. Check +12v ... Check +5v, +12v, -5v in lower ram.
- If spectrum doesn't ...
In a working spectrum, you will see in tv ...
- Power off the spectrum and take a tester.
