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  1. Replies
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    Yeah the tops of some of the legs of the ICs have...

    Yeah the tops of some of the legs of the ICs have some surface rust, but the legs themselves seem to be fine and same with sockets where applicable. Hopefully the two controller chips get here soon...
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    Not a problem at all -- I appreciate all the...

    Not a problem at all -- I appreciate all the suggestions/help very much.

    Here's the high res shots of the board:
    ...
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    Pin 3 seems to be 4mhz.. so.. yeah. I'm...

    Pin 3 seems to be 4mhz.. so.. yeah.

    I'm curious if all original 1000 boards had all these little jumper wires. The 74ls04 I replaced had three connected to it and I see a bunch elsewhere.
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    Replaced - voltages look ok.. but still no...

    Replaced - voltages look ok.. but still no difference.

    I had a look at the FDC9216 chip next out of curiosity. If I'm reading the block diagram right, I should be seeing a clock coming out of pin...
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    Looks like a little less than 1V at pin 12?

    Looks like a little less than 1V at pin 12?
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    So I've been looking at the RDDATA line, and I...

    So I've been looking at the RDDATA line, and I see a fairly clean signal up to U107. The signal looks good and clean going into the hex inverter at pin 13 but coming out it seems weak, like it was...
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    Basic 128k machine.

    Basic 128k machine.
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    I've confirmed everything works as you described....

    I've confirmed everything works as you described. I can see the step signal flashing, dir signal changing, and track 0 being pulled low after a while. But the machine does not really try to read the...
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    Yes I've sort of found the STEP line and am...

    Yes I've sort of found the STEP line and am following it back from the drive.. looks like there is a 74ls38 and 74ls08 involved. Also am rexhexking the board itself in case I broke a trace removing...
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    Okay so I replaced the 7432 and we are further...

    Okay so I replaced the 7432 and we are further along.. the drive spins and you can head the head move at startup briefly. It then goes off, and then engages again when the boot sequence begins. But...
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    Oh I've got scads of those. Will desolder old...

    Oh I've got scads of those. Will desolder old and pop in new tomorrow. Cross fingers.
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    Okay made a few interesting discoveries. ...

    Okay made a few interesting discoveries.

    Warning: this is coming from a still inexperienced technician - but I cannot find a proper clock signal at U71 pin 11. So I start tracing backwards, and...
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    Ok.. I should have just tried this before - I...

    Ok.. I should have just tried this before - I opened up my 1000SX and borrowed the entire drive assembly including cable. Checked to make sure pins were oriented same.. yup. Plugged in and fired...
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    Ok many thanks. Just FYI - I've also tried...

    Ok many thanks.

    Just FYI - I've also tried this with a 360K panasonic drive from a Commodore PC10 that does exactly the same thing. I'll have to get a pic of the jumpers but it worked fine as an...
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    Here's the photos of the two drives: ...

    Here's the photos of the two drives:

    https://drive.google.com/file/d/1l4oDORdfkgRw_iRUlrZpr6w-bghx2YT5/view?usp=sharing...
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    I have tried orienting the cable both ways.....

    I have tried orienting the cable both ways.. being careful to make sure pin 1 on the header connects to pin 1 on the drive results in what I described: drive A spinning endlessly. If the cable.is...
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    Many thanks.. I will dig out this info tomorrow....

    Many thanks.. I will dig out this info tomorrow.

    Basically what happens is you power on, and drive A immediately lights up and the motor spins. It does not react or change in any way as the...
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    Here's a video I did of it and it shows the load...

    Here's a video I did of it and it shows the load process and what happens:

    https://www.youtube.com/watch?v=lRSx1ANyIOQ&t=530s

    Another thing that bedevilled me was the 32 character TVC card...
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    Basically you have it there.. it should keep...

    Basically you have it there.. it should keep runnning through those numbers until it flashes up with a menu.

    If it isn't, you've got RAM problems somewhere - either the memory boards aren't...
  20. Thread: 3.5mm jacks

    by falter
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    3.5mm jacks

    I just looked at my records and it has been a while since I asked an inane question. So here we go:

    Is there a size of jack/connector between 2.5mm and 3.5mm? I was wiring up some RCA plugs on...
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    They're not that bad price wise: ...

    They're not that bad price wise:

    https://www.ebay.com/itm/274470708436

    Now, an MK14 on the other hand..
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    I've installed ADTpro and have struggled a few...

    I've installed ADTpro and have struggled a few times with it. And yeah it mostly seems to be around Java versions. I remember in the early days too there were issues with the Java runtime path or...
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    Insight Enterprises Z80 SBC

    Hey guys,

    Has anyone ever seen this - I bought it yesterday:
    ...
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    Come to think of it, maybe this cable is correct....

    Come to think of it, maybe this cable is correct. The TEAC drives have their PIN 1 on the opposite side that the Toshibas and most other drives do.. so even if you plugged this cable in 'wrong' with...
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    Yeah, I don't think the cable it came with is...

    Yeah, I don't think the cable it came with is original:

    https://drive.google.com/file/d/1kPcakUC6QnCVO8BgkGYZEuizftQztIRg/view?usp=sharing

    If you look really closely you can see the...
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