[Coco] RS232 Schematics, was DriveWire survey

[CoCoList for Color Computer Enthusiasts]

On May 11, 2014, at 8:02 PM, Jim wrote:

> a Coco bus to uC/CPU bridge.
> 
> When the Coco (or any system, for that matter) goes to read a byte from the bus, the data needs to be there already, because an ARM or AVR won't have time to go get it and stuff it onto the bus for the read, unless there is a wait state, and wait states are no fun.
> 
> I'm still noodling how to do that, as each legacy interface expects things in a certain way.
> 
> Jim

Could you use something like a UPB8216C to do it? I found a couple in a grab bag I got from Jameco and I set them aside thinking they might be useful to allow an Arduino/Pi to communicate over the bus with some retro computer.

http://www.datasheetlib.com/datasheet/1004516/upb8216c_nec-electronics.html

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