44 پاسخ به “Assembly and Review – PE6502 Hobby Computer”

  2. Can't see the resistor code, try magnification, aka, a magnifying lamp.
    For color blind people, are there any apps that will scan the resistor for you and give you the value?

  3. Checking components with a multimeter is a good idea anyway. I've twice been fooled. Once by a resistor that had a orange stripe that looked brown so instead of 110 ohms as I wanted, I got 11k ohms and the circuit failed. Another one was a diode that was marked backwards, blew the fuse on my oscilloscope that I had just completed building.

    So go ahead and check with a meter anyways even IF you can read it. It's good insurance.

  4. These jankie electronics is something i dont miss about classical computing… my local computer store would charge an arm and a leg to fix such issues… after the first couple of times they did that i decided to just throw anything broken out as it was much less of a headache to buy others used… btw the computer store was called "skynet" of all things

  9. Dave, I love your channel. I grew up with the Vic 20 and C64. I don't know why it took me so long to find/get around to watching this particular video. But man, for all of us that have been trained in the military as Electronics Technicians (specifically for me, in the US Navy Nuclear field), you are causing me to cringe everytime you just bend the leads on these components to make them fit on the board! Yeah, yeah, I get it, you aren't repairing a mission critical piece of equipment, but there is such a thing known as stress relief that requires you to bend at the radius of the through holes to allow for thermal expansion and contraction… Holy cow man…I know…OCD installed into my psyche by the US Navy. Lol.

    But I love your channel! So much nostalgia! Good stuff…

    Nice soldering iron by the way. I have a Haako also, but an older version. All black and comes with a key card to prevent changing the temp (meant for assembly lines)…

  20. rosin flux is not conductive.. you aid youre usin lead solder.. i assume youre using a 60/40 rosin core? i didnt see you use any extra flux. so the flux shouldnt be the issue. i dont understand why that WAS the issue.

  22. i have heard that PS2 would be easier to integrate onto a board than USB for keyboard (and mice) connections
    its to do with USB requirng the CPU to ask each device what it is doing, where as PS2 the device interrupts the processor to report what its doing

    also, I wonder if a PS2 to USB adapter would work on it

  23. I remember when I was in school another student was colour blind and couldn't tell what was blue, and it seems as though they might see blue as purple, as when he asked which colouring pencil was blue, and I showed him one of the blue ones, he said "no, that's purple"

  28. Your solder looked a bit on the thick side. Even the solder you could get from Radio Shack (RIP) was usually thinner. Also I've never had to clean flux off a PCB or strip board project, so I'm really surprised that this was causing the circuit to malfunction, especially for a digital circuit. Perhaps the scrubbing helped in some way with a dodgy solder joint?

  29. When I construct electronics I keep one of those peak electronics LCR meters on the bench and quickly measure the component values before soldering them in. Easy if you are tired to solder in a 100k resistor instead of a 10k. Also great for checking if you have a duff electrolytic, or something is way out of tolerance. I figure it’s worth the extra time to try to get things right 1st time rather than troubleshoot later.

  30. Ah! Remember the good-old-days when it was possible to buy a laptop with a SERIAL PORT? So helpful for debugging electronics. These days I ask for a laptop with a serial port and I get the response "Nobody wants those". Well I am asking, so clearly somebody wants it?

  32. Yes, a big part of the appeal in building your own kits like this is the experience itself. I'm an amateur at this hobby myself, but it's always exciting to spend an hour on building up a board, plugging in the power, and having things come to life. Honestly, I've been burned, I've accidentally broken off parts, I've even been temporarily blinded by an errant solder splash, and I've had some failed kits. But, it's always fun to take a crack at one, and I'm considering picking up one of these more complex boards.

  33. To prepare one of those wide DIPs, you hold the chip with the leads flush against a surface, and bend slightly. Also, when inserting, get the pins just started in the holes along one edge, then press towards that from the other side, to let those pins also fall. Then press uniformly and it pops in. With a little practice, buckling pins should no longer happen.

  41. 19:05 This "maze" looks surprisingly good. This shows why studying "primitive" 8-bit programs can be beneficial, a least "spiritually": you can find ingenious gems there. Nowadays you don't see this kind of ingenuity (because programmers don't have limited resources (memory, cpu), and they use very high level languages).

  43. I absolutely love your videos, and this one is no exception. Just a tiny hint for you from someone who has been soldering for 30 years… Try not to put the solder onto the tip first and then onto the joint. Heat the joint by placing the iron tip so it's touching both the lead and the pad, then apply the solder to the other side of the lead and pad, trying not to touch the tip at all. This will ensure a much better quality joint as you are making sure both surfaces are properly heated.

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