Teardown of a musical mobile. The bits aren't too interesting, but there's a die shot of the controller at the end, which has large areas which presumably hold the music. ... https://www.youtube.com/watch?v=tNYcDzWA-RQ
A description of the problem I had with my rainwater harvesting pump controller, and the potential fix.
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https://www.youtube.com/watch?v=rq-1I81i2EM
This is a real-time look at the Z80 Arduino shield running a program at 80Hz.
More details on my blog:
http://trochilidae.blogspot.com/2019/12/z80-arduino-using-mega-as-debugger-ever.html
Code and PCB files on Github:
https://github.com/blackjetrock/z80_shield
The PCB is on Dirty PCBs:
https://dirtypcbs.com/store/designer/details/9818/6402/z80-arduino-shield
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https://www.youtube.com/watch?v=cI2plP4ELJY
A qick prototype to check that a Blue Pill can be attached to a Rockwell 920 main board. The PPS-4 processor that this calculator uses a -17V supply which means voltage dividers are needed before the 3V3 ARM processor can sense them.
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https://www.youtube.com/watch?v=I1Vrf0dEtaQ
One of the first prototyping steps is a connection to the keyboard of a non functioning fx501p. The scanning is done by a bluepill, and a small OLED display shows some key information.
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https://www.youtube.com/watch?v=MSAbGUsRUsc
The picoputer emulator is still attached to the link adapter, but the Arduino Mega is now a pipe that routes traffic to and from a USB link to a PC. The PC runs a server program which can load a binary file (.btl or .bin) to the picoputer. As the link adapter uses a proper transputer link, this should also work for a real transputer.
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https://www.youtube.com/watch?v=taZ5__p4sI0