Difference between revisions of "OSBYTE &B3"

Latest revision as of 19:12, 8 March 2015

OSBYTE &B3 (179) - Read/Write primary OSHWM

   This value contains the page number of OSHWM ignoring any font implosions
   and explosions

@@ Line 1: / Line 1: @@
 [[Category:OSBYTE]]
-OSBYTE &B3 (179) - Read/Write primary OSHWM/ROM polling semaphore
+OSBYTE &B3 (179) - Read/Write primary OSHWM
-     On the BBC, B+ and Electron, this contains the page number of OSHWM
+     This value contains the page number of OSHWM ignoring any font implosions
-    ignoring any font implosions and explosions.
+     and explosions
-     On the Master onwards, the font is always exploded, and this location
-    contains the ROM polling semaphore. When the semaphore is non-zero the
-Hz ROM service call &15 is sent to ROMs. The semaphore is normally
-    accessed with *FX23 to increment it and *FX24 to decrement it.
 ==See Also==
-* [[OSBYTE &16|OSBYTE &16]] - Increment ROM polling semaphore
+* http://mdfs.net/Docs/Comp/BBC/OsbyteA6
-* [[OSBYTE &17|OSBYTE &17]] - Decrement ROM polling semaphore
-* [[OSBYTE &B9|OSBYTE &B9]] - Electron ROM polling semaphore location
-* [[Paged ROM service calls]]
 [[User:Jgharston|Jgharston]] 22:30, 26 May 2009 (UTC)