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Type: Posts; User: mwillegal

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  1. Replies
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    Possibly the capacitor in the speaker driver...

    Possibly the capacitor in the speaker driver circuit?

    -Mike W.
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    734

    Tooling for injection molding is extremely...

    Tooling for injection molding is extremely expensive for small runs for an item of this size. I'm thinking that some kind plastic/resin casting technique was used, which is suitable for small...
  3. Thanks for the comment - this sort of feedback...

    Thanks for the comment - this sort of feedback means a lot to me.

    I'm not out of the vintage computer hobby, it's just that I'm more interested in spending my limited vintage computer time on...
  4. Brain Board Gerber files released for download

    Since I'm no longer making or selling Brain Boards, I've made the Gerber files and CAD files available for download from my website. This board has been cloned by a few different folks, but if you...
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    I'm going out on a limb and say it's a solid...

    I'm going out on a limb and say it's a solid state 800BPI reel to reel tape emulator that would be used in place of an old fashioned 9 track reel to reel tape drive. We could probably get more...
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    This only makes sense if there were a number of...

    This only makes sense if there were a number of valuable stolen objects floating around that could be fairly easily identified by the original owners. At this point, I don't think they exist, at...
  7. The mechanism should operate smoothly. The old...

    The mechanism should operate smoothly. The old dried up grease in these drives can be difficult to remove, but take the time to get all the old stuff off. You should use a light plastic compatible...
  8. Unless it is completely off, radial alignment...

    Unless it is completely off, radial alignment shouldn't greatly affect formatting a floppy. It should only affect drive to drive compatibility. Since it sometimes works, you might still have a...
  9. Are you trying to debug the internal drive with...

    Are you trying to debug the internal drive with the shield between the floppy and the CRT removed?

    -Mike Willegal
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    You really need to understand the considerable...

    You really need to understand the considerable limitations of the 8008 and other available processors to really understand how good the 8080 was (for 1974). Also, and some people hold different...
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    Many parallel ASCII keyboards have a separate...

    Many parallel ASCII keyboards have a separate reset output, so control-alt-del could be mapped to assert reset. Other keys, like arrow keys, can be mapped to single or multiple key strokes that your...
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    Contact me off this list and I can send you the...

    Contact me off this list and I can send you the modified version of AS8 that I use. I haven't noticed any bugs in it, but I/O port assignments are different than with some 8008 assemblers.

    There...
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    New 8008 Related Software Released

    Three 8008 items are now available and downloadable from my website.

    My OS/X SCELBI app has been updated with a Scopewriter interface. The latest version is free: ...
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    I would look at the Apple IIe; the IIc is...

    I would look at the Apple IIe; the IIc is essentially a IIe without any expansion slots beyond what is already built in. It's a lot less expandable and thereby less interesting than the IIe. Both...
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    I love all these micro-controller based emulators...

    I love all these micro-controller based emulators that keep surfacing - very cool project.


    "My" mini-monitor is really a port of Bob Cook's Basic CREED Monitor that was described in the May,...
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    Sad Mac error codes are described in a number of...

    Sad Mac error codes are described in a number of places online. Assuming it's a bad memory chip error, which is a very common fault for these machines, it's not that bad a job. I recommend that once...
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    The retro keyboard idea is something I've started...

    The retro keyboard idea is something I've started and stopped about 3 or 4 times over the last decade. I think I keep stopping mostly because of the cost of quality keycaps and keyswitches.

    I...
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    A short update on my Digital Group video card...

    A short update on my Digital Group video card project.

    I have acquired all the really hard to source parts, which wasn't too difficult or costly. I have also started on the PCB layout. Seems...
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    Part of it depends upon the coding scheme, but if...

    Part of it depends upon the coding scheme, but if stored properly, cassette tapes themselves are quite long lasting. I've successfully read data from a number of cassette tapes that were written in...
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    For what it's worth, MCM 6571s are available from...

    For what it's worth, MCM 6571s are available from Quest Components for substantially less than what Kevin is asking for them. 6571's have a slightly different character map than the 6574, but...
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    I think the font is from the Lettraset catalog of...

    I think the font is from the Lettraset catalog of fonts. I used to know the exact font name, but can't remember it right now and don't have my vintage Lettraset Catalog at hand.

    regards,
    Mike...
  22. The Scopewriter is not, strictly speaking, an X-Y...

    The Scopewriter is not, strictly speaking, an X-Y display, as it only draws in the X axis. This makes it a vastly simpler solution than some others, at the cost of supporting only one line of...
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    that is a later system, which I understand, has...

    that is a later system, which I understand, has an evolved version of the video card in it

    -Mike
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    Digital Group Video Card Availability?

    Couple of questions related to this video card that was initially designed for the Mark-8, but also used with other systems, such as the SCELBI. I'm interested in having one to go with my growing...
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    I've seen this, with marginal I/O cards plugged...

    I've seen this, with marginal I/O cards plugged into an Apple IIe. First thing to do, is to unplug all I/O cards and see if the symptoms persist.

    regards,
    Mike Willegal
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