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  1. bzotto

    ELIZA pre-AI software from Microware

    Here it is. The back side was a backup copy of the front side, but someone recorded over the first couple minutes with other data (not KC, dunno). The rest of the back was intact and makes a useful cross reference for issues on the front. Neat, thanks for sharing.
  2. bzotto

    ELIZA pre-AI software from Microware

    Attached is what's in the wav file (Pretty sure-- I did some manual reconstruction for a couple iffy bits but I feel OK about it). There's a long series of s-records, it's a binary program (ie not BASIC) file that I assume loads with MIKBUG or equivalent. Unfortunately though, the recording...
  3. bzotto

    FLEX for 6800 (source code).

    FYI, you can also find the FLEX source for 6800 here (so you don't have to go digging in disk images): https://deramp.com/downloads/swtpc/software/FLEX/FLEX%20Source/6800%20FLEX/ (2.1 version, same entry points/map as 3.0 also)
  4. bzotto

    Sol-20 Keyboard

    FWIW, there's an outfit in TX that manufactures premade replacement pads for these keyboards which makes an reliable overhaul relatively straightforward and cheap: https://texelec.com/product/foam-capacitive-pads-keytronic/?highlight=foam (I used one of these kits for a PET once some time ago to...
  5. bzotto

    ICOM FDOS-III for the Poly88

    No personal experience with it, but my understanding is that the iCOM (later Pertec) FDOS software was released as a handy complement to their various drive hardware offerings. I don't think they had very broad uptake. There were a couple revisions and I think FDOS-III was the latest. Here's a...
  6. bzotto

    California Amiga A1050 "Knockoff" 256K RAM expansion kit : $40

    I do not have an Amiga 1000. Yet a few years back, through an unexpected combination of peak-COVID zeal then changed plans, I ended up with four of the A1050 Knockoff PCBs and parts to build them out. The design is a straight recreation of the A1050, the 256K RAM expansion for the (first) Amiga...
  7. bzotto

    Shugart 801 drive enclosures

    You are set up for success! (The AC connection truly is not a big deal to do— it’s the same three wires from the wall directly to the drive, but if you get to the point where you have DC and data sorted but are still feeling iffy on the AC, send me a DM, I can help you.)
  8. bzotto

    Shugart 801 drive enclosures

    There are certainly (vintage) external enclosures out there, though they usually already are home to a drive or two, and they are incredibly heavy and $$ beasts to ship around. (Here's an example of an enclosure that comes with 2x Shugarts.) If you don't have easy access to one of these, you can...
  9. bzotto

    What happens when an Altair hits an octal number higher than 377?

    Totally. If you happen to use a Mac, the built-in Calculator app has an octal mode (first View->Programmer, and then move the slider under the "display" to "8". It also shows binary at the same time, so I find this super useful sometimes for octal and hex manipulation and conversions. When I...
  10. bzotto

    TRS-80 Pocket Computer (PC-1) software tapes from Tandy: degraded leader adhesive, break-away

    Your splicing block looks good to me! I use a metal splicing block and splice tape from duplication.ca which carries good repair supplies for cassettes: https://www.duplication.ca/ (A nice thing about their splice block is that it will hold the tape securely in place in a channel to help you to...
  11. bzotto

    Value of brand new, unopened Commodore PET 2001-8N found in basement

    It's basically like a KIM-1, but produced in parallel by another chip company (Synertek) that was second-sourcing the same computer CPU chip (the 6502) that Commodore built the KIM-1 around. (a quick blurb here ). KIMs and VIMs and SYMs -1 are all "computers," but distilled down to their...
  12. bzotto

    Pacific Northwest Paper Tape Punch Service - and request

    Not to complicate your efforts further but you might consider eventually sending one of your tapes to someone with a functioning Teletype model 33 as a final cross check– those use an entirely mechanical reader as I understand it, so the spacing really would matter. Given their popularity in the...
  13. bzotto

    Pacific Northwest Paper Tape Punch Service - and request

    Glad they made it intact! I’m also intrigued by the hole spacing— my punch is a high speed GNT model from the 80s (probably) or later and I expect it to be pretty precise. Its reader is optical but the tape feed is still done with a rotating mechanical sprocket so presumably it can read tapes...
  14. bzotto

    Pacific Northwest Paper Tape Punch Service - and request

    I think this depends on the platform and software/firmware you were using to read/write the tape? The Altair 680 tapes that used the Motorola S-record format in ASCII used CRLF between lines, and used even-parity bits. I believe Pittman's Tiny BASIC program used only LF, no parity, and they...
  15. bzotto

    Programming Altair confusion

    Excellent! Great achievement, young Steve Dompier would surely approve.
  16. bzotto

    Programming Altair confusion

    I sense there may be a conceptual skew that happened somewhere up the thread and I worry that you're unintentionally overcomplicating it. I assume you're looking at Dompier's original listing at the bottom of the linked page because we're talking in octal. That listing is already set up to do...
  17. bzotto

    Programming Altair confusion

    What Chuck said ^^. Octal is a holdover from earlier systems where different bit widths were common, was benign but confusing on the 8-bit Altair, and very quickly was replaced by standard hex on the IMSAI and the Altair 680. If you have a 6-bit character, you can represent that fully and...
  18. bzotto

    Programming Altair confusion

    I second everything Dave said (and I add my own editorialization that octal is wildly unintuitive for anyone who learned software development after the 70s, for whom multiples of 8 bits is simply a law of nature) but yes, 041 is an octal value, and one way of recognizing that on the Altair is...
  19. bzotto

    Pacific Northwest Paper Tape Punch Service - and request

    Lol but aww. As extremely cool as punch tape is as a medium, it is so unwieldy and niche and there are usually ways around it, it rarely makes sense to work directly with for actual data. (My own "side hustle" born of a similar personal need is programming 1702A EPROMs-- I put up eprom-hut.com...
  20. bzotto

    Pacific Northwest Paper Tape Punch Service - and request

    To @DougM and anyone else watching this thread: Someone popped up on ebay divesting of a whole bunch of 1" paper tape, in bulk at a good price. A good opportunity if you need some: https://www.ebay.com/itm/386260500354
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