Differences

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--- software:upi_conventions [2016/06/14 10:12]
ex_writer [User-Defined Subroutines]
+++ software:upi_conventions [2016/06/14 10:18]
ex_writer
@@ Line 125: / Line 125: @@
 From system BIOS:
-<code>If the call index provided is negative [or from $ff through $80] then the users dispatch table pointer (USERTB) is used [also UMARGT]. Note that the sign bit isn't zapped before being used as an index, this means that the users dispatch table pointer should point 128 bytes before the first entry.</code>
+<code>The UPI has been extended to support user-supplied routines. If the call index provided is negative [or from $ff through $80] then the users dispatch table pointer (USERTB) is used [also UMARGT]. Note that the sign bit isn't zapped before being used as an index, this means that the users dispatch table pointer should point 128 bytes before the first entry.</code>
-=== Example ===
+Also:
-<code z80>
-     LD        HL,USERMT-64     ; WHERE USERMT POINTS AT
+<code>
-     LD        (UMARGT),HL
+THE UPI HAS BEEN EXTENDED TO PROVIDE USER PROVIDED
+  ;  SYSTEM ROUTINES. IF A NEGATIVE CALL INDEX IS ENCOUNTERED
+  ;  BY THE INTERPRETER, AND 'SUCK INLINE' IS OPTIONED, THE
+  ;  USER MACRO ROUTINE ARGUMENT TABLE IS INDEXED FOR A
+  ;  PARAMETER MASK.  THE ADDRESS OF THIS TABLE IS ASSUMED
+  ;  TO BE IN (UMARGT),(UMARGT+1).  THIS POINTER SHOULD
+  ;  POINT 64 BYTES BEFORE THE FIRST REAL ENTRY.
+  ;  I.E. LD      HL,USERMT-64  ; WHERE USERMT POINTS AT the USER's Macro Table
+  ;       LD      (UMARGT),HL
 </code>
+----
 The user must set up the subroutine as follows: