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  • Nivag Swerdna's Avatar
    September 5th, 2020, 07:27 AM
    Yeap the hinge appears good. I guess I will have to try and get physical with it at some stage.
    160 replies | 7162 view(s)
  • Nivag Swerdna's Avatar
    September 5th, 2020, 05:03 AM
    Away from the electronics I have a physical issue with the case... at some point in its previous life the bracket at the back has been bent so the...
    160 replies | 7162 view(s)
  • Nivag Swerdna's Avatar
    September 5th, 2020, 04:19 AM
    It's been a while but I had to wait for a 74LS157 and some DIP16 sockets... Firstly, an admission :sigh: I looked very very hard at the reset...
    160 replies | 7162 view(s)
  • Nivag Swerdna's Avatar
    August 30th, 2020, 04:34 AM
    From memory, it is flatline low and independent of nRESET. I'm pretty confident that I have a problem with the 74LS157 at D2 and that could explain...
    160 replies | 7162 view(s)
  • Nivag Swerdna's Avatar
    August 30th, 2020, 02:15 AM
    I noticed that when started from cold the nIRQ line appears to be flat lined but on soft restart I see periodic (blanking period) interrupts. ...
    160 replies | 7162 view(s)
  • Nivag Swerdna's Avatar
    August 28th, 2020, 05:59 AM
    I am not making any material progress but... I removed H8 and H9 the buffers to the onboard RAM section... no change. And I replaced CR3 the...
    160 replies | 7162 view(s)
  • Nivag Swerdna's Avatar
    August 27th, 2020, 12:18 PM
    In the screen images above one of them shows a PC of 371F which clearly doesn't sound feasible.... and the screen images show corruptions... which...
    160 replies | 7162 view(s)
  • Nivag Swerdna's Avatar
    August 27th, 2020, 12:25 AM
    I did try freeze spray before, particularly on the 75154 and 6x 74LS244s but could not see any change in signals or behaviour. I don't have the...
    160 replies | 7162 view(s)
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About Nivag Swerdna

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About Nivag Swerdna
Location:
London, UK
Occupation:
Technical Consultant - Computing - Distributed and Embedded Systems

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September 20th, 2020 11:42 AM
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July 17th, 2020
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