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Recent content by BennehBoy

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    C64C fault diagnosis

    No progress on this :( Might be a sixty clone candidate when I get time, but that said, is there a c64 equivalent of amiga pcb explorer anywhere?
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    C64C fault diagnosis

    I think there must be a broken trace or dry joint, if I flex the board then the system boots... These things are sent to test us
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    C64C fault diagnosis

    Desoldered CIA 2 on the hunch that it was killed by a hotplug, and the system started into basic at first power on post desolder. Cycled the power and it's back to that screen... scratches head.
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    C64C fault diagnosis

    BTW here's a link to the symptom as described by the pictorial fault finding guide -> https://www.pictorial64.com/fault.htm?id=u8_1
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    C64C fault diagnosis

    Same issue with diag test cartridge initially, but then some garbled cycles and eventually a cyan border and just white background. I can make out during the cycling that some of the screen patterns match what I'd expect from diags so some code is being executed at least. Exact same issue with...
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    C64C fault diagnosis

    I have a c64C which is showing a very similar fault to this: The pictorial fault guide suggested that this fault could be caused by a faulty 7406 (U8) or 2 other 74LS14s - because I have the parts & wishfully thinking these may be relabelled on the 64c I replaced U23 (74LS14) & U22 (7406) -...
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    Commodore monitor 1084S-P and PHILIPS CM8833II

    Great to see you got it working. I'd love a 1084 or a 1901, but they go for silly money here in the UK.
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    Disks not reading after lubricating 1541 spindle hub

    Always great when the frustration ends, well done.
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    6520 & 6526

    I guess it depends what you wish to use it in, they work just fine in 1541's. But yeah 6522 equiv, not 6526 as I wrote - braino moment.
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    6520 & 6526

    6526 is available as brand new part still -> https://www.mouser.co.uk/ProductDetail/Western-Design-Center-WDC/W65C22N6TPG-14?qs=opBjA1TV901DbgJ9rfcBoQ%3D%3D&countrycode=GB&currencycode=GBP
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    Commodore Plus/4 - Diagnosing problem

    Are you able to update the firmware on the older pi1541?
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    Disks not reading after lubricating 1541 spindle hub

    Excellent, glad you got it fixed.
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    Disks not reading after lubricating 1541 spindle hub

    I'm by no means an expert but I think I'd be targeting UF3.
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    Disks not reading after lubricating 1541 spindle hub

    You could work outward from UC1, there's a data in pin where a serial stream comes in from the read head, it's get's differentially amplified by the 2 592's and then more so by the 311. UC1 then essentially deserialises the data stream and pops it out 8 bits at a time to UC2. I'm not sure...
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    1541 Mitsumi drive operating way too fast!

    Got to be worth trying to replace the trimmer pot or the newtronics control board first - there are a lot of drives out there with dead heads so I would've thought it may not be too hard to obtain. I don't know the pot value I'm afraid. I had an alps with a very slower spindle motor, but it...
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