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  1. Thread: Fake ICs

    by falter
    Replies
    6
    Views
    91

    No, a Dynalogic Hyperion. I've sort of probed...

    No, a Dynalogic Hyperion. I've sort of probed around with my logic probe and scope, and it seems like things are functioning up to this video attributes controller, and then something goes wrong at...
  2. Thread: Fake ICs

    by falter
    Replies
    6
    Views
    91

    Thanks Hugo. Here is the photo they gave me:...

    Thanks Hugo.

    Here is the photo they gave me: http://www.pro-electr.net/image/20190821/6370199397778092473097882.png
  3. Thread: Fake ICs

    by falter
    Replies
    6
    Views
    91

    Fake ICs

    Hey guys,

    So I found a supplier, finally, for CRT8021-003 chips. I bought 10 of them at $4.00 per. But I'm leery because I recall reading in here, some years ago about 'fake' ICs, particularly...
  4. Replies
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    203

    The dumped data from the EPROM to me looks good...

    The dumped data from the EPROM to me looks good and consistent - however I'd need another dump from a working Hyperion to compare and be sure. Haven't found one yet.

    I've found two more sources...
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    So is the assumption that if the EPROM contains...

    So is the assumption that if the EPROM contains valid data it must be working? Can it not have some other kind of electrical failure that retains the data but prevents the chip from operating?
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    Thanks guys. I'll try burning a new one in case....

    Thanks guys. I'll try burning a new one in case. I tried putting a random 2732 in from something else (original was a 2732 obviously)... didnt seem to have any effect... basically getting blank...
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    EPROM failure question

    Can an EPROM fail in such a way that you can read it in a reader, but it doesn't actually work in circuit?

    Just dragged out my Hyperion again for one last go over. As I mentioned before it...
  8. Replies
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    And now I remember why I put it away years ago -...

    And now I remember why I put it away years ago - it has the MDA... can't really do a ton with that. :)
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    Woohoo it wasn't him! I missed that one...

    Woohoo it wasn't him!

    I missed that one unfortunately. I'm hoping it didn't go to a keyboard ghoul.
  10. Replies
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    It was a Xerox 820-II. I wanted the keyboard...

    It was a Xerox 820-II. I wanted the keyboard because I have an 820 board in a custom case. The seller basically had a complete system but sold the drives, computer and keyboard separately. I tried...
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    Ebay BIN buyer names?

    Is it possible to see who bought something on a BIN, or at least their hidden ID?

    I want to see if I managed to stick it to vintagecomputermuseum today. :cool:
  12. Replies
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    IT WORKS I did three more things after using...

    IT WORKS

    I did three more things after using IMD to adjust the RPM to +/- 300:

    1) Backed off the screws holding the upper head assembly, and pushed it as far back as I could, as I could see...
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    I tried running the IMD alignment check... I'm...

    I tried running the IMD alignment check... I'm not really sure how to read it but comparing to reading in the good drive, they both make the same beep pitch, similar numbers etc.
  14. Replies
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    Ah. So that pot I was messing with controls RPM....

    Ah. So that pot I was messing with controls RPM. I dialed it in to about 299 rpm... which is what the other drive stabilizes at.
  15. Replies
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    Ok. I'm running IMD test rpm and it says 272rpm...

    Ok. I'm running IMD test rpm and it says 272rpm on that drive.. does it need to be 300rpm right on?
  16. Replies
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    Thanks Chuck. Am I safe to presume that the...

    Thanks Chuck.

    Am I safe to presume that the lower head, being untouched, is aligned ok?
  17. Replies
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    Ok.. so for noobsplaining purposes, when we speak...

    Ok.. so for noobsplaining purposes, when we speak of alignment are we speaking just of the physical head alignment? Are there likely to be any further PCB adjustments?
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    Ok so I attempted to center the head just a bit...

    Ok so I attempted to center the head just a bit more. Now, it will format, copy files, and run files copied on that disk. The other drive can read the directory but of course cannot open any of the...
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    I knew the pot I was adjusting was out from the...

    I knew the pot I was adjusting was out from the get go because I messed with it years ago. The other two are untouched.

    I noticed the head still had a slight tilt to the right so I rebent it. ...
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    So I took a chance and removed the head, bent the...

    So I took a chance and removed the head, bent the copper leaf spring just enough to get the top head to sit down properly.

    The drive reads directories fine. I can create directories and small...
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    The problem with File Explorer is it isn't always...

    The problem with File Explorer is it isn't always reliable (ie it'll just stop copying) and require intervention when problems like long file names, etc crop up. I find it easier and safer to use a...
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    Robocopy: Slowest copy utility ever?

    Is it me? I've tried every switch purported to help with this, but I find robocopy absolutely chokes on small files. It seems to take it hours to copy stuff that just copying via File Explorer does...
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    I was thinking of maybe affixing a small weight...

    I was thinking of maybe affixing a small weight of some kind to the head armature. Or something like plasticine on the head 'tent'. Just enough to get it there?

    I don't know how good the...
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    Yes there is a tail there: 55252 55253 ...

    Yes there is a tail there:

    55252

    55253

    So is there a way to readjust things without messing up the alignment?
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    Here are pics I hope answer that: 55241 ...

    Here are pics I hope answer that:

    55241

    55242

    55243
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