OSWORD &42

OSWORD &42 (66 ) - Sideways RAM transfer 1770 DFS

On entry:
 XY+0   =function
 XY!1   =main memory address
 XY+5..6=data length
 XY?7   =ROM number &00..&0F or &10..&13 for banks W, X, Y, Z
 XY+8..9=sideways address
The functions are:
&00 - Read from absolute address
&40 - Read from pseudo-address
&80 - Write to absolute address
&C0 - Write to pseudo-address

See Also

• http://mdfs.net/Docs/Comp/BBC/Oswords

Jgharston 13:36, 26 May 2009 (UTC)