Miscellaneous distractions and diversions.
I’ve fallen into a deep hole involving current-limiting circuits and current sources, in an attempt to solve a minor problem with the Yellowstone disk controller. In the big scheme of things, this isn’t a very important problem, but it has…
All these Yellowstone glitching mysteries may finally be headed for a conclusion. It looks like there are at least two separate problems with different causes: one causing glitching during a bus cycle and the other causing glitching at the end…
Did anybody else see this week’s news about problems with Hubble’s 80s-vintage onboard computer and think: *gasp* My moment in life has arrived! Hold my beer. “Hello, NASA? Did you guys try PR#6? Sometimes the boot disk gets dust on…
I just spent more than two hours troubleshooting a seemingly simple HTML problem. When I copied and pasted a small section of HTML, the web browser displayed the newly-pasted section differently from the original. The horizontal spacing between some of…
In an earlier blog post, I was lamenting how one-ninth of an FPGA block RAM was wasted when storing 8-bit ROM data, because there’s no simple way to make use of the 9th parity bit in each word of a…
I’m still working on development of a disk controller card for the Apple II. As part of that effort, I’m still trying to understand the design of the UDC disk controller. My hope is to combine what I learn about…
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