I do various things, but my current project is Project 54/74, where I'm trying to photograph, annotate, and turn into schematics the integrated circuit dies of every 54- and 74- series logic chip I can get my hands on. See the data at project5474.org. I don't monetize my videos, but I have a Patreon page where you can help me with supplies and equipment at www.patreon.com/user?u=3190442
You have inspired me to do my own video. I have a Remex RRS3300. In read mode it moves the tape at 300cps by a capstan and pinch roller and stops it with a brake; in wind mode it goes around 300ips using reel torque controlled by a complex system of AC motors, triacs, brakes, relays, and microswitches, including one that acts as a differentiator. No sprocket. It reads the sprocket holes optically same as the data holes and outputs them as a ninth channel for sync. Compared to your machine, it absolutely flies, so it should make an exciting video if not as polished as yours. I use it to archive tapes that came with my IBM 1620 Data Processing System in 1978, because the 1620's own reader wears out tapes.
Hi Robert. I need code extracted from a PIC16C58B 04/P chip and then copied to a few other chips. They are from an obsoleted motor controller board and I want to keep parts on hand for repairing this board. I'm willing to pay, can you or anyone else help me?
My favorite fact about Lojban is that the word for “x₁ is a/the name of x₂ used by x₃” has M before N-“cmene”-only because someone mistyped Spanish “nombre” as “monbre” and Hindi “nām” as “man”. I wonder if the word would’ve still been “cmene” instead of “cneme” if it weren’t for Russian. (Instead of имя, “imen”, the word root for “to name” именовать was used as a source word)
I bought 2 LCDs and replaced 1 so far. Instructions & tips very clear but review twice…Removed to contrast wiper on mine, but still have some faded background, will have to try a few things such as checking and adjusting resistance, batteries, and this PC1 has a mod from 1996 that may be affecting the LCD…Very clear winner…Much appreciated and will be changing my second PC1 later…Thanks for all the background research, analysis, testing, etc…Excellent
hello sir, I want to ask about the design of chips, graphic cards and other computer devices such as Intel, Arm Bionic chips, Apple, AMD, Nvidia. What software did they use to make it?
ICE was such a good peice of software, shame theres not a legal way to download it now. ah, i so wish i actually saved a backup when i used it as a kid.
Is there are market to provide custom PCBs quickly in the USA? I just got my batch of PCBs from China, took two weeks and the design changed 3 times since then. I just ordered another batch of 50 of the latest design, and now I wait another two weeks. The first batch just goes into the trash. I use toner transfer and etch, and while this works good..I have to print multiples to get a good one off the laser printer and hope I don't screw it up with the iron. I've seen lot of videos people making cnc circuit boards, and their results are about as hit-and-miss. It can't really do small smt components reliable like the production machines can do. I think you still need to etch which can do molecule level work.
People like you will put Society back to it's feet after a mega tsunami, earths magnetic pole invertion or some other catastrophe, amazing work, congrats!
Hi Good evening, Im kalai. 3:58 in this timeline I noticed that the leadscrew of X and Y axis. Is they covered using aluminum tubes? Under the BED is there any slots ? How did they make motion on X and Y axis. Can you explain if you have a time?. Thanks and regards, KALAI
Thanks for showing us your very serviceable setup. 🙂👍Used to do this sort of thing professionally, almost half a century ago. It's slow, patient, fascinating and satisfying work. We also used near-UV light at high magnification (1200x and higher) to find surface features down to about a micron in width. A micron wide feature appears as a fuzzy line in that light, but you can make good use of interference patterns to figure out exactly what is going on. You can also etch through the layers of Silicon, to learn about Gate sizes, Oxide depths, doping depths, etc. It's possible to discern depths and thicknesses down to within a few hundred Angstroms, using similar optical methods and very careful etching; controlling etchant temperature, concentrations, mixtures and temperatures.
this machine is ridiculous expensive. it takes a lot of time to make a pcb, is messy, fiberglass all over the place (i would not like that dust to go in to my lungs).
I tried decapping chips with a blowtorch, and I got success... but on many chips there's definitely heat damage visible. Don't know what it it, silicium should be fine, maybe metal/glass? The chips I tried it on required nuking of the entire package until glowing orange hot.
UPDATE ! Thank you so much for making those screens. You saved me a precious tool and memories. I received my 2 screens (one for spare !) in due time and the screen exchange was really easy. Just had to resolder a small wire broken during dismantling. I let the old besel and screen in Acetone over night. The next morning I was able to remove the old LCD glass without damaging the adhesive strips. So I dried it in the oven and kept them to old the new LCD in place... On my (very early) model, it is only 3 batteries and less junk wires. The screen contrast potentiometre is NOT glued and I was able to adjust it without any problem (full value as you suggest !). The tiny computer did just restart "as new" ! It"s just wonderfull after 43 years, and sitting in the basement for decades. I still have to work on my casette interface and the printer ... Thanks again !
Hi Robert I have a question. let's say I have both source imp and characteristic imp 50 ohm. should we have 50 ohm as well on the load impedance to prevent a reflection?, we know that mostly our load is high impedance, should I parallel terminate it with a resistor close to the load? load impedance e.g another CMOS buffer of MCU, or maybe a transistor.
Greetings from a recent Tech Tangents video! I was so fascinated by this project, I just bought one on eBay with a printer and a trashed LCD, and bought your replacement screen, just to join the two together. It's so fascinating to learn that a replacement glass LCD can be manufactured at a reasonable modern cost! (And yeah, I'd fully expect Sharp to have paid a lot more than that, at the time, with the time's technology!)
Hello Rob and thank you for this tutorial, but being French, I can't understand what exactly the IPA is, the product you use to clean! Can you tell me what that acronym is?
