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  • No text at startupGreetings from Norway all Spectrum enthusiasts. I hope someone can help me with this. When I power up my Spectrum 48k (issue 3b) I get a white border…

    ... : Many thanks Zorn! The new chips I inserted was 4164, replacing ... new and old RAM chips could be faulty, or is the problem ...
    zxviking zxviking November 2014 Hardware
  • Resurrection of ZX SpectrumHello everyone. I recently emerged from my attic bearing my childrens 128k ZX Spectrum +2 with a bag of games etc. Like many before it hasn't seen…

    ... if any of these were faulty. But as the Z80 CPU ... ROM chips between a good known working machine and the faulty one ... . If the fault does not move with the ROM chips ... buy).

    The RAM chips are normally soldered in, so ...
    1024MAK 1024MAK January 2015 Sinclair Miscellaneous
  • Dodgey R62 / D16 on Issue 2?Hello all, I am still beavering away trying to work out why my Issue 2 fails and after a much closer visual inspection I noticed what looks like som…

    Could be faulty upper RAM (if it's installed)?

    If it's socketed pull all the RAM chips to see if it then starts up.

    B
    balford balford January 2015 Hardware
  • Dodgey R62 / D16 on Issue 2?Hello all, I am still beavering away trying to work out why my Issue 2 fails and after a much closer visual inspection I noticed what looks like som…

    [QUOTE=balford;812849]Could be faulty upper RAM (if it's ... socketed pull all the RAM chips to see if it then ...
    Korinel Korinel January 2015 Hardware
  • Newbie with a faultHi all just joined after digging my spectrum out of the loft after 30 years, it was put up there because it had a common fault I remember from back i…

    ... power supply failure (the RAM chips that provide the lower 16K ... results in damage to these chips).

    If you're ... conversion circuit that might be faulty - you can replace these with ... more of the lower RAM chips (these are at the bottom ...
    balford balford January 2015 Hardware
  • TR4/TR5 replacementHi guys, I've got another Spectrum I'm working on now - an Issue 4S this time. When I originally got it, I powered it up and did the basic tests a…

    ... also just ordered 8 4116 chips from Ben V to replace ... . All of the currently installed chips pass your resistance checks just ... and it flagged IC8 as faulty. I am tempted to replace ...
    Tekno Venus Tekno Venus February 2015 Hardware
  • Features that are still wanted in Spectrum emulation.Features that are still wanted in Spectrum emulation. 4 USB joystick/gamepad input for real multiplayer games - Yes, Bomb Munchies.... - Sinclair 12…

    ... halves of a load of faulty RAM chips is another matter entirely ...
    zub zub June 2015 Emulators
  • 48k not startingHi team, I have 2 48k's, one works (Issue 4s), one doesn't (Issue 4a). The non-working one appears to start, but not finish the RAM test. The pape…

    ... chip(s) appear to be faulty.

    Is the ROM ... supply voltages on the RAM chips. The voltages on the other ...
    1024MAK 1024MAK September 2015 Hardware
  • 48k not startingHi team, I have 2 48k's, one works (Issue 4s), one doesn't (Issue 4a). The non-working one appears to start, but not finish the RAM test. The pape…

    ... 's between the good and faulty machines once you've verified ... ? It's possible that a faulty address line on the ULA ... all the lower (4116) DRAM chips... Replace with good ones, or ...
    neillsun neillsun September 2015 Hardware
  • 48k not startingHi team, I have 2 48k's, one works (Issue 4s), one doesn't (Issue 4a). The non-working one appears to start, but not finish the RAM test. The pape…

    Which pins on the DRAM chips are you measuring?

    ... is wrong).

    A faulty TR7 open circuit TR7 will ...
    1024MAK 1024MAK September 2015 Hardware
  • Recommend-me-do - memory card devicesSo, both myself (with a +3 that has a dodgy drive) and my friend (with a +2) are looking at the various options for loading from memory card. What…

    ... require larger memory and CPLD chips.

    Sorry to disappoint ... , but how does the 128 KB RAM drive operate, is it ...
    zPasi zPasi September 2015 Hardware
  • 64k speccydoes anyone have instructions on how to use the extra 16k found in some spectrums?

    ... some higher capacity RAM chips that were half faulty so bought cheap ... you'd want to use faulty RAM is beyond me!
    RobeeeJay RobeeeJay September 2015 Hardware
  • 64k speccydoes anyone have instructions on how to use the extra 16k found in some spectrums?

    ... the so called faulty sections of the DRAM chips used for the ... "upper" memory are not actually faulty.

    Regardless of which chips are actually fitted, the hardware ... and extra control logic (logic chips) to implement a bank ...
    1024MAK 1024MAK September 2015 Hardware
  • 64k speccydoes anyone have instructions on how to use the extra 16k found in some spectrums?

    ... some higher capacity RAM chips that were half faulty so bought cheap ... you'd want to use faulty RAM is beyond me![/quote ...
    digital digital September 2015 Hardware
  • 64k speccydoes anyone have instructions on how to use the extra 16k found in some spectrums?

    ... other half of the RAM chips, assuming you fit 4164's ... the '80 KB Spectrum', where
    64 Kbit DRAM chips have been ... two dif-
    ferent 32 KB DRAM banks at address #8000 ...
    Dan Antohi Dan Antohi September 2015 Hardware
  • 64k speccydoes anyone have instructions on how to use the extra 16k found in some spectrums?

    ... the '80 KB Spectrum', where
    64 Kbit DRAM chips have been ...
    zPasi zPasi September 2015 Hardware
  • Spectrum +3 blinking yellow/blueI received a +3, which only gives a yellow/blue blinking border during initialization. Pressing BREAK when powering on does not work, neither does a …

    [quote="schombi;835388"]I was afraid it´s faulty RAM - thanks Amstrad for removing the RAM sockets on a +3...[/quote]

    Look on the bright side... You only have to desolder two chips instead of eight :D
    guesser guesser September 2015 Hardware
  • Spectrum +3 blinking yellow/blueI received a +3, which only gives a yellow/blue blinking border during initialization. Pressing BREAK when powering on does not work, neither does a …

    ... any +2A/B or my faulty +3. When I used one ... /> Does it mean all four chips are faulty?
    schombi schombi September 2015 Hardware
  • Spectrum +3 blinking yellow/blueI received a +3, which only gives a yellow/blue blinking border during initialization. Pressing BREAK when powering on does not work, neither does a …

    ... unlikely that all four DRAM chips have failed...
    My guess ... one of the two DRAM chips that provides bits 0, 1 ... -contended DRAM chip that is faulty. Not the DRAM chip that ...
    1024MAK 1024MAK September 2015 Hardware
  • Opus Discovery "the big switch on" (after 20 years)I have a few of these Opus Discovery's with different Eproms in that have not been swiched for 15-20 years or so . I am in no rush to switch any on …

    ... period of swapping Eprom chips ,PIA chips , the 6116 chips . Finally it appears ... spare chips and Eproms but finding out which ones are definitely faulty ...
    harriusherbartio harriusherbartio October 2015 Hardware
  • Wanted 6C001E-7 ULALooking to replace mine from a issue 4B, anyone got a working one spare in a bag of bits or know where I can get one?

    ... working one these on a faulty issue 4S board. It has ... ambush of thrown Make-A-Chips from disgusted speccy fans!) Or ...
    Your Spec-chum Your Spec-chum November 2015 Wanted
  • Help with Spectrum 128k reparationHi! I have the following symptoms with a 128k unit version 6U - On power on, black and white bars (one char width each), white background - Once po…

    ... /> * I bought brand new ram chips
    * Flashed an EPROM (with ... />
    What else can be faulty? ULA? Z80? And how do ...
    kwyjibo kwyjibo November 2015 Hardware
  • Sudden death of ZX Spectrum 48KHello A friend gave me a 48K rubber keyed Spectrum. I brought it home, hooked it up to my little TV and powered it up. I was very happy to see t…

    ... too, like the upper RAM chips on this Spectrum..

    48 motherboards? I will download the ...
    memrah memrah December 2015 Hardware
  • Sudden death of ZX Spectrum 48KHello A friend gave me a 48K rubber keyed Spectrum. I brought it home, hooked it up to my little TV and powered it up. I was very happy to see t…

    ... , that fault is indicative of faulty lower RAM. To be honest ... that several of the 74LS chips are on sockets leads me ...
    DEATH DEATH December 2015 Hardware
  • Sudden death of ZX Spectrum 48KHello A friend gave me a 48K rubber keyed Spectrum. I brought it home, hooked it up to my little TV and powered it up. I was very happy to see t…

    ... the 4116 "lower" DRAM chips has gone faulty. If he has an ...
    1024MAK 1024MAK December 2015 Hardware
  • Sudden death of ZX Spectrum 48KHello A friend gave me a 48K rubber keyed Spectrum. I brought it home, hooked it up to my little TV and powered it up. I was very happy to see t…

    ... think connecting it to the faulty Spectrum wouldn't damage it ... the 4116 "lower" DRAM chips has gone faulty. If he has an ...
    memrah memrah December 2015 Hardware
  • Dead issue 3b with black and white barsHi all, I've been donated an issue 3b which has some nice black and white bars with a few flashing blocks. I've done a few RAM tests and could spo…

    ... ) or one of the DRAM chips faulty and is dragging down a ... />
    If the "upper" DRAM chips are socketed, you can remove ...
    1024MAK 1024MAK December 2015 Hardware
  • Dead issue 3b with black and white barsHi all, I've been donated an issue 3b which has some nice black and white bars with a few flashing blocks. I've done a few RAM tests and could spo…

    ... ) or one of the DRAM chips faulty and is dragging down a ... of things like the RAM chips or the Z80 dying, what ...
    Mysterion Mysterion December 2015 Hardware
  • Jiiira's Sparrow LITEHi All, Just for info .. :) big eprom, cheap 32KB ram and etc. i don't know specification .. :) https://youtu.be/NbI7E1aebrM modern speccy .. …

    ... compatible. But all those old chips [b]will[/b] die (and ... result from dying old RAM chips (lower 16K in particular).
    * Big flash ROM (2Mbit = 256 KB). Flashable from the machine itself ...
    RetroTechie RetroTechie December 2015 Hardware
  • Issue 3b boarddiode ID5 and cap C47 are missing from my board will these have any effect on system powering up. I have checked the voltages on the 7508 and its …

    ... of the lower ram chips that is faulty, I will get some ...
    caver99 caver99 March 2016 Hardware
<1…19202122232425…34>

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