--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lib/alib/jsr_cmd2.as	Sat Jan 26 17:18:24 2013 -0600
@@ -0,0 +1,58 @@
+***************************************
+
+* Subroutine to jsr to subroutine from 2 character command table
+
+* OTHER MODULES NEEDED: none
+
+* ENTRY: D=2 char command
+*        X=start of jump table
+
+* EXIT:  CC carry set if entry not found 
+*        all other regs can be modified by subs
+*        D and X always modified
+
+* Note format of table: each entry is four bytes
+*                       0..1-match characters (command)
+*                       2..3-offset to routine
+
+* It is the user's job to set commands to proper case for matching...
+
+* end of table=NULL
+
+* sample table:  fcc /A1/
+*                fdb routineA-*
+*                fcc /B1/
+*                fdb routineB-*
+*                fcb 0 
+
+
+ nam Jsr to 2 char Command
+ ttl Assembler Library Module
+
+ section .text
+
+JSR_CMD2:
+ tst ,x end of table?
+ beq jsrerr
+
+ cmpd ,x++ found match?
+ beq docmd yes, go do it
+
+ leax 2,x next entry
+ bra JSR_CMD2
+
+* no match found, return with carry set
+
+jsrerr
+ coma set error flag
+ rts
+
+* command found, do call and return
+  
+docmd
+ ldd ,x get offset to routine
+ jsr d,x
+ andcc #%11111110 clear carry
+ rts
+
+ endsect