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- Опубліковано 19 сер 2024
- Episode 767
I finished building the faux IMSAI and it works great. I'm very pleased.
Unboxing: • #760 IMSAI 8080 Kit Ne... Buy one: thehighnibble....
Watch my videos with a real IMSAI: • #1 IMSAI 8080 Introdu...
I might have had the only IMSAI that could talk! • #71 IMSAI 8080 talks f...
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As a new 2011 hobby electronics guy this is absolutely fascinating. As for the switches get a few of them and keep them in places that you look at all the time, It will, as weird as it seems make you feel young. It’s like having a photo of yourself on your childhood bicycle. Love your videos.
My IMSAI kit from Dave is on its way. Can't wait!
Brings back memories. I never used this particular device, but my first programming experience was with a PDP-8 so-called mini computer in college. It operated very similarly to the imsai.
Looks like the one I used to work with at the Byte Shop in Pasadena when I was a kid. Love this!
That looks pretty cool. I have an IMSAI 8080 complete with 8" floppies and manuals. I haven't fired it up in years. I should probably sell it. I had a lot of fun with it in the 70's.
I hope it still works. Mine did not and I have about 70 videos on me getting it running again. That is how I started my channel. Go back to video #001
I had one of the first IMSAI 8080 kits in 1975. I had upgraded to the Z80 board and filled all 22 slots with cards. I had the serial and parallel I/O cards along with a number of memory cards and four sound cards for a music synthesizer. I had it connected to both an ASR33 and the original TV Typewriter. Sadly it was stolen from my home a few years ago and I've never been able to replace that machine. I spent countless hours hand assembling programs and entering them through the front panel switches. As I remember the first memory card was on 1k of memory. You could load programs from paper tape or cassette tape once you had the boot loader toggled in through the front panel. The 8" disk drive came later with CP/M.
I had more than 22 cards but never had that many at once in the machine. Usually about half full.
More of this ! back to vintage computing now and again is always a good thing 👍🏻
Nice! I can't imagine why you would have sold your original IMSAI? Those will only get more valuable as time goes on. I came into computers in the minicomputer era with the Data General Nova machines. Used to carry the Nova instruction set on a cheat sheet in my wallet so I could type in a program through the front panel whenever the need may arise! Core memory, paper tape, ASR33 teletypes, good stuff!
Same as you!
I think I still have a couple 8" floppy drives kicking around and a mostly complete Digital Research Big Board. I had a IMSAI front panel for debugging when I built my S-100 box. Those were the days. UPS Blue Label to get bare boards shipped fast so you could build on the weekend.
I was in college when these kits came out. I couldn't afford one then but I'm gonna get one to hang on my wall.
Reminds me of the days when there was a decision between buying some more NTE2102 chips for my projects or have Kool-Aid, peanut butter on soda crackers for dinner...Typically the 2102 purchase won out
I perfectly understand your feelings. My first computer was an XT machine with 8086 proc. and no hard drive. My parents purchased it in a special shop (named Pewex), where you could pay in USD only. Poland in 1991 was a hard place to live (and still is) :).
Nice to hear you so happy.
Made one of these about 2 years ago. Very cool. I also built the PiDP-11/70 simulated replica and the Altair 8800C. The Altair is a full S100 machine made with a Altair CPU replica and some newer boards. One designed and made by Martin Eberhard (yep, the real founder of Tesla). Look up the channel deramp5113 for the Altair. There is also an Altair clone (also by deramp) that is akin to the IMSAI simulated replica. But it's in a full size box.
That's awesome. Even the LED colors through the clear panel.
And twelve bricks for weight
Hello IMSAI Guy. I was Dec_guy years ago but no longer. I had an Altair running CP/M with 4 eight inch floppy drives, serial and parallel ports, Hayes modem, the works. Unfortunately I no longer have it. I still have an insane collection of DEC 11’s, HP 200’s, IBM PC’s and even an IBM 5100,and etc. most likely it’s getting near that time in life to begin to purge. Breaks my heart.
Nice review. I was in High School late 70's and saw one in the Mesa Az Byte Shop. Wanted but couldn't afford one, I saved $$ and bought/built a SWTPC 6800 system. Now, I'm nearing the end of a career in Test & Measurement. So happy to have my IMSAI front panel. Now if I could only get a Fairchild FST-2 front panel.
Well Sherm, maybe you and Mr. Peabody can take a trip in the "Way-Back-Machine" and get an original to show us! Thanks for the look.
ua-cam.com/video/jFhpO3s85rI/v-deo.html
I have a playlist for all my IMSAI videos
REminds me of the PDP8
Someone made a faux PDP: www.rs-online.com/designspark/my-raspberry-pi-thinks-its-a-pdp-8
They are a great way to learn machine language.
I have a PiDP-11 (a PDP-11/70 emulator) with the blinkenlights and switches on the front panel. After a few decades, I can run 2.11 BSD UNIX again! It's really quite a satisfying feeling that it delivers. I took into work with one day, and frighted all the young whippersnappers describing how computers worked back in the day. Symbolic debuggers! Feh, I have a front panel and lights!
it's funny to watch you talk about entering data in octal but then switch to hex .... 323 or 333 and then say FF. The Imsai " IMS associates inc " had the colored switches that you could group by 3 or 4 depending how you were going key data in. If you were mainly a Hex guy you would group them by 4 like you have there or if
you were an octal guy you would group them by 2/3/3 per byte. I liked it as a hex machine... even though it's just 1's and 0's.
I do like your content though.
i first learned 8080 on an octal machine, then when I got my IMSAI I did most in HEX, but I still remember the basic instructions in octal. Never thought of rearranging the switch paddles.
I was expecting a big steel box.
only the original: ua-cam.com/video/jFhpO3s85rI/v-deo.html
The big decision. Altair vs IMSAI. The Altair was very cool though the A model was ugly as a mud fence; the B model was much spiffier. But the IMSAI had that killer front panel. It's a shame that I was too poor to afford such things while I was in college. Gosh, how I longed for one of these things....
Very cool. I'm looking at my Altair 8800 on a shelf next to me. I built that from a kit in my senior year in university. Later a friend and I had an IMSAI. I wrote the driver to hook a daisy wheel printer and then a mailing list program to print labels. I think all programmers should write a few program in assembly, then convert it into binary and entered into a computer with front panel switches. It is then that you gain a real understanding of how it all works. I had a 40 year career designing systems with microprocessors impeded in them and writhing the software to make the magic happen.
Here's a sales sheet for the first project I did out of university, an arcade video game called *EMBARGO.* www.gamesdatabase.org/game/arcade/embargo*
you are right about firmware writers being too removed from understanding the hardware. The front panel and single stepping is very valuable. Very few use an ICE also. The Atmel ICE allows for inspection and stepping and would be a major step up from the Arduino.
@@IMSAIGuy I'm retired now but have been missing that thrill of coding down to bare metal. I'm busy learning other skills but I might just find a way to dabble a bit more (no pun intended).
Thanks for an interesting channel. *SUBSCRIBED!*
You keep switching back an forth between saying values in octal and hex. For instance you give the octal 333 to read from the input port, but then you say from port FF (hex) instead of port 377 (octal).
i first learned 8080 on an octal machine, then when I got my IMSAI I did most in HEX, but I still remember the basic instructions in octal.
@@IMSAIGuy Guess I was just being picky! I learned on my Altair starting in 1975, and even put small colored tips on the data switches D0 - D7 to highlight the four bits of each nibble. My Altair is on the bench awaiting its resurrection.
@@codecage9333 the 8080 opcodes where designed in octal if you read the datasheet and look at opcode grouping you will see the designers were doing octal
It was a sad day when you sold your IMSAI, I miss your vintage computer exploits😢
But there’s no S-100 bus. :-(
Nope. Have to get a real one. Or get a RS2014, you can design cards for that
We're can we buy these switches I want them
If I may Suggest.... Unless you have already picked out a place for it.... Hang it on the wall where it will be visible in your videos... I may buy one myself to relive the one I had in the 70's, but if I do, it will hang on the wall in my home office just as a conversation piece... I'm happy for your reunion with an old friend.
Yes I have thought of that. Show my McGuffin.
I want!!!
ITS $280 to begin with some addition fees! the original was $1200 in 1975 AND THE KEYS BROKE!! AND COSTED LIKE $25 PER KEY TO FIX. IT DiD not LAST LONG! because the keys which are plastic broke! are these the same keys! it sounds like they may be producing the original one with all it failings!