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Using a thermal camera to fix speccy's.Hi All, Thought I'd share another repair... Got a board that collapsed the bench supply straight away ( I run a bench supply and give it just enou…
... enough current for a working spectrum to limit the damage if ... putting out 600mA at 2.5v.... ( as power drops below 600mA ... up.
Did a 5V test on the 7805, and ... to 9v, no problems, 5v rail stable, -12v and -5v also both present ... -
Building a ZX Spectrum and I have some voltage questionsI've posted about this before looking for parts, but now I've found all the hard-to-get stuff (thank you Retrolium!). So I figured new questions, new…
... /> Both supplies work on my Spectrum +, and the latter was what ... I got:
+5V to "RF": +4.82V (probably ... an RF Modulator)
+5V to Lower RAM: +4.98V ... RAM: +12.56V
-5V to Lower RAM: -4.31V ...
+5V to Upper RAM: +4.98V ... -
Built a ZX Spectrum that works, but can't get the upper RAM to work?Like the title says I finished my Spectrum 3B board, and it boots, but it doesn't see the upper 32k of RAM. When it boots, the lower 16k works f…
... title says I finished my Spectrum 3B board, and it ... and RAM chips, with no effect. I've verified all ... .6 volts on my Spectrum+ with a 6A board.< ... the same as my working Spectrum+. Then again, I don ... with "done", same as my Spectrum +
... -
Spectrum Games Where "How to Play" it advice is neededThis is the thread where advice on how to play any Spectrum can be sought .But why would anyone need advice on how to play Speccy games after all t…
... on how to play any Spectrum can be sought .But why ... it was so obvious that no proper explanation was necessary !
Any help with the Spectrum version of TILT appreciated You ... -
What are the differences between the +2 and the +2A ?I only acquired a +2 for the first time in my life a few months ago. It works fine. :) I even managed to tracke down nearly all the wargames by the s…
I have no idea why the +2a is ... voltages adjusted to 5V, +12V and -12V. No other spectrum has rgb output ... -
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…
... a 0 or 1. So no, the diaphragm will not stick ... speaker (not sure about the Spectrum's, don't have a ... V, 0.25 V, 0.5V, 0.75V. I can number ... -
Help with dead Spectrum +2aHello. My Spectrum +2a died some time ago. It was powered on, I looked away and next time I looked at it, screen was black. I have replaced the 4 r…
... black, do you mean the Spectrum screen (i.e. a white ... ]
It is steady black, no border.
[quote]
5V to less than it should ... !).
Check your power lines +5V and ground - I don't ... -
Help with dead Spectrum +2aHello. My Spectrum +2a died some time ago. It was powered on, I looked away and next time I looked at it, screen was black. I have replaced the 4 r…
... the TEA2000 is giving out no info. Hence the next thing ... on pin 11 (I imagine +5V but I don't know ... , as I should think the Spectrum's white screen would require ... -
Want a Speccy Repaired?Maybe it's time to put my 'skills' to use.... Now that I've sourced some of the nastier transistors, I've fixed about 6 rubber keyed Speccys in the …
... /> OK, I repaired the first spectrum by replacing IC22 (put in ... /> 4 - this one only has +5V correct, everything else is 0V ... need to change that ZTX ? No picture output on this one ... -
"Unknown disk format"-error on Spectrum +3Hi, I have just gotten around to changing the drivebelt in my newly acquired +3. I tried to format one of the 3" disks I bought on eBay the other we…
... external drive is powered by 5v?
If so ... .
[/quote]
NO!!! My Amiga drive deffo requires ... in the days when the Spectrum was young and the ... are ok with just the 5V line, but certainly not ... up to +30V in, +5V out - it's as simple ... -
Slightly OT, but gotta ask: Which 128 would you buy?Guys, I'm interested in getting a 128 Speccy. Problem is, I never had one close to try, and I ignore which advantages has one model compared with the…
... " drive.
How about Spectrum/PC (direct) connectivity for each ... swing), or is it a +5V port only?
@Aowen ... these colour differences? I am no expert in the '128s. Don ... (8 KB SRAM), two CZ Spectrum 48, a One-Drive OPUS ... -
Spectrum 128+2Greetings to all My Speccy Tape Drive has died. Fully blown :( Is there any way to hook up a external cassete player to the +2? I can't see any "lin…
...
GND
PLAY
+5V
REC
TEST
You can ignore the +5V and test for now but ... the +5V line is a useful place ... This is a fact, no wind up, it's a ... to the Spectrum hardware - there is no buffering, no safety stuff ... -
Using a +3 power supply to power a CPC.Hi there, I'm going to try and power a CPC6128 using a +3 power supply. The +3 supplies 12V DC 0.2A and 5V DC 2A, the CPC6128 needs 12V DC 0.4A and …
... QUOTE=dasteph]There are 2 +5v, 2 +12v and 1 ... [/URL][/QUOTE]
No fair.
I ... wires were yellow, the 5V wire (and the one ... br />
"Sinclair 128k Spectrum +2A Power Supply Unit
DC outputs:
+5V @ 2A
+12V @ 200mA< ... -
128k dead, no TV signalI got 128k spectrum (heatsink model) from a friend of mine. He told me that speccy is dead, and he doesn't know what's wrong with it. When I plugged…
No, one wire is +5V, we've established that the ... to the TV. At the Spectrum end, you need to wire ... if it isn't a Spectrum menu screen.
If ... -
replacement +3 psuok, who would be kind enough to help an idiot build a replacement PSU for the +3 / +2a , from a PC power supply? Guesser has already helped out a gr…
... /> The Spectrum will draw just whatever it wants with no problem to ... , 5V at 30A is enough current to seriously f*ck a Spectrum ... a 2A fuse in the 5V line as that's what ... . Such a system essentially has no Power Good functionality and will ... -
MP3 loading testsIn a previous thread, Spector says: "The loss of an mp3 file is nothing compared to the loss from an old audio cassette tape. " Dunny says: "Which i…
All the Spectrum requires is an audio signal, of approx 5V amplitude. Depending ... sufficient to fully drive the Spectrum EAR socket. If your tape ... of this impedence will have no trouble in sounding loud at ... -
48k one dead, one dodgyhello everyone. I have 2 48k spectrum +'s (the one with the QL case). Both boards have issue 3B on them near the speaker. The first will power up …
... 4116 RAM needs - there are no less than FOUR supply pins ... those small ICs - GND, vcc, -5v and +12v!). I don't ... slowly working on my first Spectrum repair. My next one will ... -
Audio input on a +2would it be possible to connect an external tape recorder to the socket at the back,or would something bad happen?
... have said this before, no doubt I will be saying ... lead goes from the Spectrum to the MIC socket ... sampling the ouput of your Spectrum to your PC, you ... hear when there's no tape signal is usually ... In your opinion, could this 5V ghost voltage be responsible for ... -
Zx Spectrum Laptop (again)I've been reading all the old treads about a possible portable speccy. I even found the one about the Speccy Laptop. But it seems there's a lot of ne…
... inside the Speccy that would no longer be needed by the ... it for newer, 5V version?
But Spectrum 48K has not RGB ... on every second line. Probably no chip on market for that ... -
Zx Spectrum Laptop (again)I've been reading all the old treads about a possible portable speccy. I even found the one about the Speccy Laptop. But it seems there's a lot of ne…
... active project for a Spectrum on a chip using ... and everything runs off a 5v supply. It's very ... heat sink. (On a Spectrum, everything is NMOS or TTL ... than the ULA on a Spectrum, and it's also ... controller designed for microcontrollers... no reason why it couldn't ... -
Dead Spectrum +Hi all, I've recently dug out my old Spectrum + with the idea of repairing it. When I last looked at it, when I was much younger, I was soldering a …
How to fix a 48K Spectrum, in a (big) nutshell:
< ... the ULA.
If no picture, check for power on ... the modulator. If no power present, see "test the ... required to run the RAM. +/- 5V and +12V. If not, check ... -
toasted soeccysHello, ive jsut bought a pair of speccys on ebay (one 16k issue 2 & a prob 48k issue 3) unfortunaly the genius who sold them tried to see if the wor…
... /> How to fix a 48K Spectrum, in a (big) nutshell:
If no picture, check for power on ... the modulator. If no power present, see "test the ... required to run the RAM. +/- 5V and +12V. If not, check ... -
toasted soeccysHello, ive jsut bought a pair of speccys on ebay (one 16k issue 2 & a prob 48k issue 3) unfortunaly the genius who sold them tried to see if the wor…
... is because the 7805 is no longer supplying enough power - rather ... 4 power supply pins - 0v, 5v, -5v and 12v!)
The ... />
There's also a Spectrum fault finding manual linked to ... when fixing the rubber keyed Spectrum that I have (that turned ... -
toasted soeccysHello, ive jsut bought a pair of speccys on ebay (one 16k issue 2 & a prob 48k issue 3) unfortunaly the genius who sold them tried to see if the wor…
... additionally - although my analogue electronics fu is not all that strong, looking at the schematics for an Issue 2 suggests that the power supply that generates some of the 'weird' voltages (+12v) is a switch mode power supply, which gets regulated by ... -
toasted soeccysHello, ive jsut bought a pair of speccys on ebay (one 16k issue 2 & a prob 48k issue 3) unfortunaly the genius who sold them tried to see if the wor…
... to say has no real background, it ... the rest of the Spectrum? Pardon my ASCII:
o------| Coil and |--- -5V --//--| |
| | | Rest |
9Vcc ... -
toasted soeccysHello, ive jsut bought a pair of speccys on ebay (one 16k issue 2 & a prob 48k issue 3) unfortunaly the genius who sold them tried to see if the wor…
... Vbb is the -5v supply, so supplying the +5v and GND to ... RAM with the +12/-5v supplies disconnected is likely to ... refresh). I'm in no way an "video effect ... be able to checksum the Spectrum's ROM (this wouldn ... 't work with modded Spectrum ROMs, but the DB ... -
Testing RAM Chips After RemovalHi I am going to use Winstons Hot Air Gun method of removing the RAM chips from a 4S circuit board. I wish to check the RAM chips, I have a Logic Pr…
... if you never want the Spectrum's ROM to be paged ... built in and sized for 5v operation)
- 1 x ... power up or whether the Spectrum's ROM is paged in ... wired in, so there's no reason why the flash chip ... 't be programmed by a Spectrum. (That feature is there to ... -
problem with sinclair zx 48 issue 6aHi all, I have the following problem when I turn on my sinclair without rom inserted. [url]http://217.79.64.145/sinclair/5.jpg[/url] when I turn o…
... small history facts for this spectrum..
1'st I ... memory chips used 5v I remove track from 5v on the left ... ?
i change 74ls04 no result
next week ... -
Unconventional way of diagnosing a faultHi everyone Some time ago I got a 48k Spectrum (issue 3B board) in a pretty bad condition. I believe the power supply transistor TR4 failed, causing…
... me:
check the +5v/+12v/-5v supplies to the 4116 memory ... exact waveforms with my scope (no enough bandwidth - it has maximum ... signature below - this uses the Spectrum's own Z80 to do ... /> Since this is the third Spectrum I'm repairing maybe investing ... -
Notation questionI wasn't quite sure where to put this post, so anyone's welcome to move it whereever may be more appropriate. So I'm reading about Z80 interrupts he…
... BUSRQ with a flip flop, no need for transistors - you would ... (i.e. 0v and +5v, electrically). The third state really ... is neither tied to +5v or 0v by the output ... (like the Z80 in a Spectrum) use NMOS - so they ... a path is connected to +5v. Except with NMOS, there ...
