[Coco] Orchestra 90/cc to Stereo Composer Conversion http://6809assemblylanguage.fortunecity.com/ORCH90CC-2-STEREOCOMPOSER.

[jdaggett at gate.net]

Interesting circuit. I have one question. The TSC line on the Translator circuit, Is 
that from the TSC Input to the MC6809E?  If so it shou ld do nothing as the TSC 
is an inout to the MC6809E and not an output.

james

On 7 May 2007 at 16:41, coco at yourdvd.net wrote:

> $FFF0-$FFFF TO $BFF0-$BFFF TRANSLATOR.pdf
> This circuit is from a project I have been working on for over a year.
> It is a single-board Robotics Control Computer (SB-RCC) Designed to
> run OS-9 Level I and Nitros-9 Level I with minimal fuss. To that end,
> the SB-RCC duplicates some of the weirdness of the MC6883/74LS783
> S.A.M. chip. This particular circuit is designed to translate any
> address in the range of $FFF0-$FFFF appearing on the CPU's address bus
> (or is that buss) into $BFF0-$BFFF. Note: The S.A.M. only translates
> addresses from $FFF2-$FFFF, but since $FFF0-$FFF1 is a "reserved"
> interrupt, I figured No Harm, No Foul, and besides, it made design
> much simpler. Other circuits from this design include some to
> duplicate the write only switches of the S.A.M. and an MMU that
> functions like the one in the CoCo 3 (I want it to eventually do Level
> II and the MMU isn't that difficult to duplicate) - As soon as I find
> where I placed those schematics (they're around here somewhere), I'll
> add them to the zip file. There is also an infrared eye circuit and a
> 40Khz sonar circuit to allow a robot to navigate. OS-9 is perfect for
> this sort of thing!