Installation guide

7 Additional Libraries OS-9 V2.4 on EUROCOM-17
34 Software Manual
Sys$VMECCtl Enable/disable caching of VMEbus read cycles
❏ Input:
d0.w = 1 (Sys$VMECCtl function code)
d1.l = 1: enables caching
0: disables caching (*)
-1: read status only
❏ Output:
d0.l = status
❏ Error Output:
cc = carry bit set
d1.w = error code if error
❏ Possible Errors:
E$Permit - you must belong to group 0 to use this function
❏ Function:
Sys$VMECCtl enables or disables the cache for VMEbus longword read
cycles. If d1.l equals -1, no action takes place. The status of this
function is always returned in d0.
❏ Note:
The VMEbus caching is allowed for aligned longword read cycles
(A32, D32) only.