[Coco] What's wrong with the 6809 Y Register?

[William Astle]

Tony Cappellini wrote:
> 
> 
> During an interview with Chet Simpson about Digger II, in Nick Marentes' 
> book CocoNuts,  Chet states "The Y register was avoided at all costs"
> 
> What is the problem with using the Y register?

Most operations on the Y register have a 2 byte operation code rather 
than a single byte. Thus they take longer to execute. There are cases, 
however, where avoiding the Y register actually makes things slower 
and/or take up more space so I wouldn't avoid it at "all costs" 
personally. I do only use it as a last resort or after careful 
consideration.

-- 
William Astle
finger lost at l-w.net for further information

Geek Code V3.12: GCS/M/S d- s+:+ !a C++ UL++++$ P++ L+++ !E W++ !N w---
!D !M PS PE V-- Y+ PGP t+@ 5++ X !R tv+@ b+++@ !DI D? G e++ h+ y?