-
Who can repair a 48K Spectrum?My Spectrum is broken, please see: [url]http://www.worldofspectrum.org/forums/showthread.php?t=29351&highlight=7805+heat+sink&page=2[/url] Does anyb…
... loose contact allows a control signal to go active when it ... /> Which is why I put weak pull-ups (~47K ohm to ... loose contact then has that signal pulled to 'inactive', which may ... -
Who can repair a 48K Spectrum?My Spectrum is broken, please see: [url]http://www.worldofspectrum.org/forums/showthread.php?t=29351&highlight=7805+heat+sink&page=2[/url] Does anyb…
... loose contact allows a control signal to go active when it ... /> Which is why I put weak pull-ups (~47K ohm to ... loose contact then has that signal pulled to 'inactive', which may ... -
Developing ZX Spectrum using 8 chipsHello. Sorry, my english is not perfect. I am developing new realising of ZX Spectrum. There are 8 chips in my sch. Central processor and video proce…
... really right. For example, cicle M1 (fetch instruction from memory) with ... and video record of video signal i formed. -
Multiface 1 cant load tapesIve just acquired a Multiface 1 for my 48k, seems to work alright, brings up the menu etc but when i go to load a tape,(and this is in the off or on …
... multiface is affecting the loading signal - I have soldered a new ... it inserted (as though the signal level is too low).
The M1 line on the Z80 appears ... -
Opus Discovery 1 problem insideHi folks, when I opened my Opus Discovery 1 I have probably wrecked a regulator that is connected to the mainboard by three cables. Regulator 2 is wi…
... etc., probably resulting in a weak /RD signal....) After all Opus is ... -
The Phone BoookGot our new telephone "directory" today. It's smaller than ever before. Remember when the telephone directory used to be the same size as the yellow …
... landline, but the mobile signal is pathetically weak in my house and ... -
The Phone BoookGot our new telephone "directory" today. It's smaller than ever before. Remember when the telephone directory used to be the same size as the yellow …
... landline, but the mobile signal is pathetically weak in my house and ... -
The Phone BoookGot our new telephone "directory" today. It's smaller than ever before. Remember when the telephone directory used to be the same size as the yellow …
... landline, but the mobile signal is pathetically weak in my house and ... -
What am I doing wrong with loading?I recently got my Spectrum working, but I'm having troubles loading games. I plug a cable from my computers soundcard out to the Ear port, type LOAD …
... with errors - signal may be still wrong - too weak or too strong ... -
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…
... ) to replace Z80s with bad M1 lines.[/QUOTE]
Thanks ... the cable from the video signal.
I clear that ... -
Microvitec 1431 MonitorI've been lucky enough to get my hands on a Microvitec 1431 monitor, the one with a dedicated Spetrum input. This works great on a 48k with the in…
... see's the Composite video signal being stifled.
An ... back-to-front: collecting a signal on the output-line and ... boosting/emitting a signal on the input-line.
weak signal. -
Loading games with cassette adapter - no PLAY requiredAfter several encouragingly successful experiments with the use of cassette adapters commonly used to connect a multimedia player to a cassette-only …
... : if you generate such a signal at the cassette adapter that ... at all if the signal is too weak, even if you press ... -
Spectrum +3 - No TV OutHi All, I bought a +3 the other day only to find the thng does not put out an image? What I mean is if I connected up the RF and try to tune, …
... make sure you enabled rgb signal on your tv and not ... out, it was just a weak soldering job. Now RF& ... -
Spectrum +3 - No TV OutHi All, I bought a +3 the other day only to find the thng does not put out an image? What I mean is if I connected up the RF and try to tune, …
... make sure you enabled rgb signal on your tv and not ... out, it was just a weak soldering job. Now RF& ... -
Opus Discovery - problem reading disksHello, I recently got an Opus Discovery 1 but unfortunately for me it seems to be temperamental. :-( The ZX Spectrum that is connected to it powers…
... /> M1 - ?
M2 - Spindle motor controlled by the Drive Select signal
signal
MS - Spindle motor ... controlled by the Drive Select signal
DC - Disk ... controlled by the Drive Select signal
IU - Front LED ... -
Need help connecting.Sup guys. I just got my first Spectrum, the Spectrum+, in the mail today. Along with 15 games. But it didn't come with leads or tape drive, just th…
... not load on Spectrum (too weak signal from modern crappy machines). -
ZX80 and 81 hardware questionsI'm finding a lot of the documentation that is ostensibly about the hardware of the ZX80 and 81 to be primarily about the software. I was hoping some…
... .
[QUOTE=Thommy;564367]M1 + IOREQ active (ie, interrupt acknowledge ... I speculate that the INT signal continues being asserted based on ... -
Repairing a faulty 48K issue 2.I am investigating one of a pair of non-working issue 2 48K Spectrums that have been sitting in a cupboard untouched for quite a few years. I haven…
... on Data & Address lines. Signal Busses seem not to be ... iss.2) When the (short!) M1 pulses are not there the ... -
What spectrum?I am going to have a gent send me some Spectrum hardware in the future. Me being a american and knowing nothing of the sort, what would be the best o…
... a transformer to step your weak wimpy mains up to a ... a 50hz, 625 line, PAL signal. Modulated onto a UHF carrier ... provide the unmodulated composite video signal on their RGB out connector ... to load a tape audio signal into these machines from a ... -
Three faulty machines - help!I have three Spectrums and all of them have suddenly collapsed and I can?t figure out what?s wrong. New here.... I own three Speccies but all of a …
... for first? Is there any weak point?[/QUOTE]
When I ... check the ULA's clock signal. This is difficult without scope ... whether you have a clock signal or not). When you have ... assumption ULA has a clock signal.
Then it's ... -
MB02 picsI got an original MB02 from someone to fix, and of course I made some pics to share (click for magnification): [URL="http://benophetinternet.nl/hobb…
... time.
The /ENBT signal (which can enable the MB02 ... , /RESET, /BUSRQ, /BUSAK, /WAIT, /NMI, /M1, CLK).
Or maybe there ... -
48K's and bad DivIDE compatibilityI have had some 48K boards and complete machines in the past which didn't work fully with a DivIDE interface. The reason for that always was a Z80 pr…
... . This can't be Z80 M1 line.
If you are ... may be with distorted signals (weak, delayed) due to poor PCB ... -
ROM switch on NMIHello! Please, help me or point in the right direction. I am building a project for 48k spectrum which must activate its rom (actually static ram) …
... your memory, intercept the M1 cycle at address 0x0066 and ... datasheet i see that M1 edge and PC on ... , sampling address bus at M1 falling edge seems to be ... Because if you sample M1 when it is low then ... M1 cycle. One half clock
cycle later the MREQ signal ... -
'Jumping' Composite Video Output on +2bNot having much luck recently... I have converted my +2b to composite out using the info contained [URL="http://www.secarica.ro/html/plus3_hardware.…
What would be causing my fuzzy picture? Is the signal too weak? I am using a BNC to phono adapter and a yellow plugs cable for composite video. -
Known Z80 M1 problems?I got an email yesterday from someone asking for a Z80 without the M1 problem. I only know about the fanout problem that many Z80's are suffering of…
... put on an oscilloscope the M1 line level simply doesn't ... for the liberator, if the signal levels are already marginal for ... of those extra 5cm of signal lines may be sufficient to ... -
Known Z80 M1 problems?I got an email yesterday from someone asking for a Z80 without the M1 problem. I only know about the fanout problem that many Z80's are suffering of…
... the Z80 with a working M1 line. I have a TC2068 ... is that of a bad M1 line.
Zetr0 mentioned ... TC2068 board schematics and the M1 line on the cpu goes ... a bus booster so low signal levels shouldn't be a ... long as there is a signal to boost, that is.
Anatomy of a bad M1No, not the motorway (although at times the tarmac M1 goes about as well as this one...) But the bad M1 problem that seems to occur most with issue …
... it connected to probe the M1 line. I saw something similar ... hard to discern any useful signal.
/PedroMessenger interfaceHave anyone photos, schematic, rom images, documentation, or software for Messenger interface ? [url]http://www.worldofspectrum.org/infoseekid.cgi?i…
... 0066h is present during a M1 cycle.[/QUOTE]
Not ... rom+ram is connect during M1 cycle on adress #66 or ... input pin 2 (here is signal /WR).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? …
... input to your microcontroller. Put weak pullups on these inputs because ... than one bit down to signal reading from more than one ...Spectrum 128 toaster and divide incompatibility problems with some demos and games.Okay so I got this thing now. It?s my first Spectrum ever. [img]http://img836.imageshack.us/img836/2016/speccyl.jpg[/img] [url]http://img824.image…
... ... so it rather needs this signal :-)
I did have ... did the usual trap on M1+address method. (This turned out ...
