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Re: Gryphon 68030 [message #829 is a reply to message #828] Thu, 16 June 2016 08:29 Go to previous messageGo to previous message
lynchaj is currently offline  lynchaj
Messages: 1080
Registered: June 2016
Senior Member
Hi Dave

OK, that's great.

Regarding the R43, R45, and R48 resistors under the video adapter. Great catch! That's an error. I will add those resistors.

J21 is added only to satisfy KiCAD warnings about connecting bidirectional pin to a power input (VCC). Basically it would be just a wire jumper not posts so clearance should not be an issue. There is no point in a jumper post because there is no real option -- you have to install the wire.

For the 20MHz oscillator, I was thinking the part below from Digikey is short enough to fit within clearance. It is important to get the crystal as close to the chip's pins as possible so under the chip seems like a good place. Also minimizes interference with the PGA100 QFP chip adapter which is fairly large and is a tight fit.

http://www.digikey.com/product-detail/en/cts-frequency-contr ols/ATS200C/CTX909-ND/2292886

The TTL serial headers (or SIL socket) are right behind each of the MAX232 sockets. Just plug in the converter and you are good to go.

http://www.miniinthebox.com/ftdi-basic-program-downloader-us b-to-ttl-ft232-for-arduino_p903425.html

Thanks

Andrew Lynch

[Updated on: Thu, 16 June 2016 08:32]

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