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  • Faulty M1 linesI'm sure this has been discussed before, but using the forum search for the word 'M1' pulled back no hits, which surprised the hell out of me. Anywa…

    ... to M1 directly to the +5v supply. Now the Spectrum+ and ...
    Winston Winston April 2007 Hardware
  • Faulty M1 linesI'm sure this has been discussed before, but using the forum search for the word 'M1' pulled back no hits, which surprised the hell out of me. Anywa…

    ... to M1 directly to the +5v supply. Now the Spectrum+ and ...
    Marcelo Marcelo April 2007 Hardware
  • Spectrum 48K ROMHi Can anybody help I have an Issue 6a Circuit Board which has a faulty ROM Chip. Is it possible to program a ROM Chip with the 48K ROM and fit it as…

    ... may be connected directly to 5V.
    So, we have 2 ...
    piters piters April 2007 Hardware
  • EPROM Programmer?I'd like to pick an eprom programmer up for trying new roms with my +3 and my BBC Master (I need some extra roms to make it useable with my GoMMC any…

    ... allow you to burn 12.5V EPROMs, used by Spectrum interfaces ...
    Marcelo Marcelo April 2007 Sinclair Miscellaneous
  • 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…

    ... its place)
    - 8 x 5v LEDs (i.e. LEDs with ... built in and sized for 5v operation)
    - 1 x ceramic ...
    Winston Winston April 2007 Hardware
  • 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…

    ... memory chips used 5v I remove track from 5v on the left ...
    gorski gorski April 2007 Hardware
  • RGB OutputWas there ever a device available for the 48 that had a RGB output ? As an alternative , what about using a pc monitor (iirc these have seperate syn…

    ... to Speccy (YUV lines and 5V, GND)?

    Second solution ...
    piters piters April 2007 Hardware
  • RGB OutputWas there ever a device available for the 48 that had a RGB output ? As an alternative , what about using a pc monitor (iirc these have seperate syn…

    ... to Speccy (YUV lines and 5V, GND)?

    Second solution ...
    beanz beanz April 2007 Hardware
  • RGB OutputWas there ever a device available for the 48 that had a RGB output ? As an alternative , what about using a pc monitor (iirc these have seperate syn…

    ... voltage regulator to give the 5V the device needs. In mono ... mode it derives this 5V from the 9V available on ...
    Womble Womble April 2007 Hardware
  • Missing Voltage RegulatorHello all and a very merry 2-days-after-the-speccys-25th-birthday to you all! Okay, I've just received my brand spanking new 48K keyboard membranes …

    ... virtually anything that needs a 5v supply.

    You will ...
    Winston Winston April 2007 Hardware
  • Missing Voltage RegulatorHello all and a very merry 2-days-after-the-speccys-25th-birthday to you all! Okay, I've just received my brand spanking new 48K keyboard membranes …

    ... be supplied with -5v/+12v *without* the +5v rail if the regulator ... might not appreciate this. (The -5v/+12v is generated from a ...
    Winston Winston April 2007 Hardware
  • TIPP31 transistor questionYesterday I had the time to try and repair a 4S issue 48k spectrum I had. First of all I replaced all the electrolytic capacitors. The tr4 transistor…

    ... are the 4116 memory (the -5v and +12v side). The ROM ... is a single supply 5v chip that runs entirely off ... other digital parts are single 5v supply off the 7805 too ...
    Winston Winston May 2007 Hardware
  • 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…

    ... /> -Check IC1 pin 14 for +5V
    -Check IC1 pin 13 ...
    thomas3120 thomas3120 May 2007 Hardware
  • l.e.d question about zx81hi i know this is a spectrum forum but... ive just repaired my zx81 for the 3rd time and was wondering if it was possible to put a led in to show if …

    ... .
    thanks[/QUOTE]

    +5V o-----/\/\/\/\-----D|---*
    ..............390 Ohms ...
    Gods Gods May 2007 Hardware
  • l.e.d question about zx81hi i know this is a spectrum forum but... ive just repaired my zx81 for the 3rd time and was wondering if it was possible to put a led in to show if …

    [quote=Gods;187805]+5V o-----/\/\/\/\-----D|---*
    ..............390 Ohms.... ... the +9V instead of the +5V takes its load off the ...
    Marcelo Marcelo May 2007 Hardware
  • l.e.d question about zx81hi i know this is a spectrum forum but... ive just repaired my zx81 for the 3rd time and was wondering if it was possible to put a led in to show if …

    ... the +9V instead of the +5V takes its load off the ... /> It better to connect to +5V, this prove than the voltage ... a 1K ohms resistor to +5V
    Gods Gods May 2007 Hardware
  • 48K Speccy not workingHey, A few months ago (hope it&#180;s not to late) I was loading a game into my speccy and from one moment to another it stopped working! I unplugge…

    ... :
    Pin 1: Should show -5v
    Pin 8: Should show ...
    Pin 9: Should show +5v

    If it were ...
    Winston Winston May 2007 Hardware
  • Problems with TS2068sI bought 2 TS2068s, and this is what's happening: 1st computer: -The tv output doesn't work. The composite video output does* -The '7' key is dead.…

    If the Timex uses 4116 RAM, it probably has a little switch mode power supply to generate the -5v/+12v supply to the memory. It's probably the coil making that noise. The Speccy does that too.
    Winston Winston May 2007 Hardware
  • 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…

    ... TV's). There is also +5V line from 7805 so I ...
    netomc netomc May 2007 Hardware
  • 48K Speccy not workingHey, A few months ago (hope it&#180;s not to late) I was loading a game into my speccy and from one moment to another it stopped working! I unplugge…

    ... output and it should give +5V.
    Alternatively you may measure ... , there should also be +5V, it is the same.
    If there's no +5V, this can mean one of ... (blue ones) on the +5V line is shortened. It's ... voltage on it, if +5V appears on it, then 7805 ...
    Sonic Sonic May 2007 Hardware
  • 48K Speccy not workingHey, A few months ago (hope it&#180;s not to late) I was loading a game into my speccy and from one moment to another it stopped working! I unplugge…

    ... voltages, since checking the +12v/-5v/+5v supply at the 4116 RAM ...
    Winston Winston May 2007 Hardware
  • 48K Speccy not workingHey, A few months ago (hope it&#180;s not to late) I was loading a game into my speccy and from one moment to another it stopped working! I unplugge…

    ... power supply which makes the -5v/+12v supplies. I think the ... likely be killed if the -5v supply is removed when the ... +5v supply is still present - if ...
    Winston Winston May 2007 Hardware
  • Problems with TS2068sI bought 2 TS2068s, and this is what's happening: 1st computer: -The tv output doesn't work. The composite video output does* -The '7' key is dead.…

    ... power supply to generate the -5v/+12v supply to the memory ...
    odious odious May 2007 Hardware
  • InterfaceHi I'm building a spectrum emulator. I've tried to build it as modular as possible, for example I have a zx class that have input and output devices…

    General ROM paging is all done in hardware. Take a look at the Spectrum Diags board in my sig below if you want to see it in schematics.

    But in summary, the Spectrum exposes a line called ROMCS at the edge connector. Every memory chip in a ...
    Winston Winston May 2007 Emulators
  • TC2068 emulator cart - problemHi, Sorry for posting timex related stuff on a spectrum forum. So, this cart (spectrum emulator) can only adress 16K. I can load small games but i …

    ... . Pin 27 must go to +5V. On an EPROM this is ... have pin 27 connected to +5V (ok) and pin 6 of ...
    Alcoholics Anonymous Alcoholics Anonymous May 2007 Hardware
  • 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…

    ... br /> check the +5v/+12v/-5v supplies to the 4116 memory ... , and check the +5v supply elsewhere. It's not ... changes by something less than 5v) - but you'll need ... will be damaged if +5v is supplied in the absence ... of the -5v line, which is likely ...
    Winston Winston May 2007 Hardware
  • 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…

    ... br /> check the +5v/+12v/-5v supplies to the 4116 memory ... , and check the +5v supply elsewhere. It's not ... changes by something less than 5v) - but you'll need ... ). I see only 2.5V swing there. Ohmmeter shows ... will be damaged if +5v is supplied in the absence ...
    Avian Avian May 2007 Hardware
  • 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…

    ... to be less than 2.5v (hence the ROM is probably ...
    Winston Winston May 2007 Hardware
  • UlaI remplaced an ULA 6c001-6 by an ULA 6c001-7 chip on issue 3B board. It is "crucial" to remove R32 and adding the 2x NAND gates ??? or not ? Thanks.

    ... 4464s, with A7 tied to +5V. This is probably where the ...
    Phu Phu June 2007 Hardware
  • Making your own joystick interfaceJust spied the diagram for the kempston joystick interface in the docs section. For someone who has only made up cables, what is involved in constru…

    ... be run from a single 5v supply (Vee is from 0v ... to 5v - use a pot between Vcc ... the backlight to run off 5v. Some LCDs you'll notice ... for Vee, so the 0v-5v range was a major selling ...
    Winston Winston June 2007 Hardware
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