OSBYTE &95 (149) - Write JIM
X=offset within page &FD and Y=byte to write
JIM is officially assigned to memory extensions.
Acorn MOS 1.20 writes the byte using STA &FD00,X. This (always) involves a dummy read which may cause hardware other than memory to behave inappropriately. See OSBYTE &97.
Jgharston 22:06, 26 May 2009 (UTC)