[Coco] Embedded coco

[peak at mail.polarcomm.com]

James

Yes I did know that the S-Bus of the GIME or of the Sam is 
not really a simple thing. However, I have duplicated 
the "effects" of those three pins as would be attached to a 
138. MY version is kind of inverted though as the Y7 and Y0 
outputs are at opposite ends of the memory map. This should 
not cause any problems though because my version of the 
decoder including an equivalent of the 138 chip does give us 
a CTS, an SCS, a Rom enable, 2 PIA enables, and can even have 
a SLENB. After seeing my design, I believe you will be 
convinced that it does very closely approximate these enable 
signals like a real coco!