plasmo on Wed 6 Jan 2021 wrote:
* 64-byte ROM, dual boot either from serial port or CF disk
That's impressive.
BigEd's serial boot requires 27 bytes. Conditional branch also has overhead.
From my calculations,
booting from opto-resistors has a soft limit of 64 bytes. That is less restrictive than I first imagined.
plasmo on Wed 6 Jan 2021 wrote:
* PC board size goal of 100mm X 50mm, so 2 pc boards per 100mm X 100mm panel.
That's clever.
BigEd on Sat 16 Jan 2021 wrote:
An application! Excellent. It's but a small step to make this an alarm clock and a stopwatch... or egg timer.
I have a semi-useful feature request. I'd like an alarm clock which outputs a gpsd compatible signal on UART. That would allow time on a home server to be set from the alarm clock. I'd also like an alarm clock with mains relay. That could be used to switch a kettle, music and/or lighting. (I'm a programmer. I'm not a morning person.)
plasmo on Thu 21 Jan 2021 wrote:
My pc board shipment is taking a walkabout all over USA. It came through Los Angeles gateway early last Friday morning, then went to San Diego, then to Phoenix, to Tucson, back to Phoenix, and now is on hold in Cincinnati.
Does your parcel have a GPS receiver and e-ink label? Some people do this as a sport to see how long they can keep a parcel in transit and how many exotic destinations it can reach. The advanced ones have SMS and can be recalled at any time.
plasmo on Sun 24 Jan 2021 wrote:
Given the murky supply chain for the retro hobbyist electronics, it really is a good idea to build multiple boards to prove out a design and then periodically build a couple boards during the life of the product.
This isn't restricted to hobbyists or retro. There was a survey, possibly by NASA, possibly mis-quoted, in which an estimated 15% of electronic components are fake. Good luck launching anything with that level of fakery. You won't see me on board. 0.85^N is a disappointingly small value for moderate values of N.
I was shocked by the level of excess packaging from electronic distributors. Honestly, do my 14 pin DIP sockets have to placed in a tube, wrapped in anti-static packaging and sealed with tamper-proof stickers? After reading the terms and conditions of sale, it is apparent that some fraudsters purchase genuine components and then "return" fakes. This leaves the fraudster with higher quality components while the distributor unwittingly conveys counterfeit electronics. Apparently, this either extends to DIP sockets or the warehouse staff have been trained to package everything to this standard. I would prefer that the components weren't packaged, packaged again, sealed, bar-coded, bagged, bubble-wrapped and boxed. However, that is the minimum to counter deceitful customers.
plasmo on Mon 25 Jan 2021 wrote:
Anyone in USA interested in trying out CRC65, I'm giving away 3 blank pc boards.
Your giveaway has inspired my own. I am also inspired by the budget of your project. The offer of pre-programmed components is especially helpful to reduce cost and scope for error. The table of baud rates is also very helpful.
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