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  1. Replies
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    I think there are driver/timing issues with this...

    I think there are driver/timing issues with this last. TD8E timing is tight, the driver is large, and I believe the driver uses 8/E-isms to meet the constraints.

    Vince
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    RESTART is generated in the middle of the first...

    RESTART is generated in the middle of the first sheet of the M8341 schematic, by the N8881 at E36. That suggests to me that it is actually active low, even though it isn't called "RESTART L". Since...
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    As do I. One thing to note is that the etch...

    As do I.


    One thing to note is that the etch level is different than the "revision" indicated on the schematics. The schematics you point to describe an M8340D with revision C schematic, and an...
  4. I imagine that certain combinations were not...

    I imagine that certain combinations were not expected to be used. For example, why have a TC08 and a TD8E? So they may have decided to re-use same address for controllers that share a device type. ...
  5. At the back of every edition of the Small...

    At the back of every edition of the Small Computer Handbook are tables of IOTs for the peripherals. In the 1973 edition (e/m/f), table 9-5 on page 9-33 also gives an overall summary.

    Hope that...
  6. Replies
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    I haven't yet seen the driver for the TU60, but...

    I haven't yet seen the driver for the TU60, but it seems likely that it is not small, which means it will be difficult to come up with an OS/8 system driver.


    I found this
    55102
    in the TU60...
  7. Replies
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    Yay! I was pretty confident, but it is good to...

    Yay! I was pretty confident, but it is good to clear up that last mystery! It was going to be next month before I could get out there to look at it. Thanks Doug and Mike, for helping Jack dig out...
  8. Replies
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    Yeah, TTL doesn't do well trying to source...

    Yeah, TTL doesn't do well trying to source current like that. I think you'd run into fan-out issues without a dedicated driver.

    I do, however, have stock of the M900X, if you want to be even more...
  9. Replies
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    23,745

    Couldn't you replace the transistor with a...

    Couldn't you replace the transistor with a base-collector jumper, and run the LEDs directly from the logic gates as the LD12 is expecting?

    Vince
  10. Replies
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    According to my notes, 8E-D8AC was replaced with...

    According to my notes, 8E-D8AC was replaced with 08-dhdka,
    which is available here:
    http://www.so-much-stuff.com/pdp8/software/maindec.php

    As is 8E-D8AC, if that's still what's wanted.

    Vince
  11. Replies
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    Isn't that essentially what I was saying about...

    Isn't that essentially what I was saying about C10, except he's suggested 1uF instead of 0.1uF?

    Anyway, glad to hear it is working!

    Vince
  12. Replies
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    Well dangit! Does your system run OK with the...

    Well dangit! Does your system run OK with the new board but the
    boot DIP switches set to 00?

    I'm assuming you've checked on C10 and the close vias?

    Vince
  13. Replies
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    I've been having a conversation about front...

    I've been having a conversation about front panels with David Fenyes, so, inspired by Roland's work, I did this:
    http://svn.so-much-stuff.com/svn/trunk/Eagle/projects/DEC/8ePanel/nbulb.sch...
  14. Replies
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    The TEK 611 manual has the pin-out of that end,...

    The TEK 611 manual has the pin-out of that end, and
    the VC8E documentation has the BERG connector pin-out.

    As I recall, it's pretty straight-forward. I got
    mine almost done before I decided I...
  15. Replies
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    That looks suspiciously like your M8655 has the...

    That looks suspiciously like your M8655 has the wrong baud rate.

    Do you for some reason have status reporting is enabled? Otherwise you shouldn't be able to get the overrun bit set when reading...
  16. Replies
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    Nope. I recently switched to Thunderbird, and...

    Nope. I recently switched to Thunderbird, and apparently the junk mail folders defaulted to not notify me. Should be fixed now.

    I did find your email, and will respond to it tonight. Thanks!
    ...
  17. Replies
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    Cool! I have about 20 of the kits left. If you...

    Cool! I have about 20 of the kits left. If you go to http://www.so-much-stuff.com/pdp8/32KOmnibus/32KOmnibus.php and click on the link there, it should get you a direct email path to me.

    Vince
  18. Replies
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    Well, that's not supposed to happen :eh:. That...

    Well, that's not supposed to happen :eh:.

    That seems a little odd, too.

    I had a draft, but the forum ate it instead of posting it, where I had a couple of other ideas.

    Make sure C10 is...
  19. Replies
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    If I am following this, you loaded the IAC;ISZ...

    If I am following this, you loaded the IAC;ISZ 0300; JMP .-1; JMP 0200 loop at 0200, which is test 26?

    I'm (like you) at a loss as to how MA can equal 25. What does "another bit of code loaded...
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    Silly question, but are you trying to run with...

    Silly question, but are you trying to run with the Alliance memory chips, or with the replacement Cypress chips I sent you?

    Vince
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    Thanks! I can certainly sympathize, and my...

    Thanks!

    I can certainly sympathize, and my error rate is pretty high to begin with.
    Your input was quite valuable with tracking down the memory chip issue!

    Speaking of the memory+boot board, I...
  22. Replies
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    There was some progress on this front yesterday. ...

    There was some progress on this front yesterday. I had set things aside for a time, as the 8/E would not boot with the card installed. This even with all the chips removed! The bare board didn't...
  23. Thread: CIT-101 terminal

    by vrs42
    Replies
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    6,815

    I'm no expert, but I think I remember an issue...

    I'm no expert, but I think I remember an issue with keyboards of the VT100 and it's clones. So I don't think I'd try it without some kind of authoritive check.

    Vince
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    Not a lot to tell, yet. It's a full size Omnibus...

    Not a lot to tell, yet. It's a full size Omnibus card, which attempts to implement the VC8E board set and an M1703 subset input port (to save wear on your switch register). The logic for the boards...
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    Yeah, things are feeling hectic, as VCF-PNW is...

    Yeah, things are feeling hectic, as VCF-PNW is coming up and I really want
    to get a Spacewar board working by then. So I'm afraid I have been a bit
    pokey about the boot+mem card.

    I like the...
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