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CPM OPERATING SYSTEMS/CPM 2.X/CPM 2.2/PATCHES/CPM22APN.08

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+                                       CP/M   V2.2
+                              Application Note 08, 2/20/82
+                                   Nested SUBMIT Files
+
+                           Copyright  1982 by Digital Research
+                   CP/M is a registered trademark of Digital Research.
+                         DDT is a trademark of Digital Research.
+                                 Compiled November 1982
+
+          Applicable products and version numbers:  CP/M   V2.1 and V2.2
+
+          Program:  SUBMIT.COM
+
+               The CP/M SUBMIT program  allows  you  to  embed  another  SUBMIT
+          command  within  a  submit file.  However, control does not return to
+          the original SUBMIT file after executing the nested  SUBMIT  command.
+          To  return  control  to the original SUBMIT command, use any standard
+          editor  to  type  the  following  procedure   into   a   file   named
+          SUBPATCH.ASM:
+
+             ;
+             ;
+             subfcb: equ     5bbh
+             bdos:   equ     5
+             open:   equ     211h
+             ;
+                     org     22dh             ;submit erase subroutine
+             ;
+             opsl:   lda     subfcb+15        ;file open ok if ext not full
+                     ral
+                     rnc
+                     lxi     h,subfcb+12      ;try next extent
+                     inr     m
+             ops:    lxi     d,subfcb         ;open extent
+                     jmp     create
+             ;
+                     org     25dh             ;submit create subroutine
+             create: call    open
+                     inr     a
+                     jnz     opsl             ;loop if open ok
+                     lxi     d,subfcb
+                     mvi     c,22
+                     call    bdos
+                     adi     1
+                     ret
+             ;
+             ;       the following code calls the above routines
+             ;
+                     org     4feh
+             ;
+                     call    ops              ;open the $$$.sub file
+                     jc      517h             ;jump if not opened ok
+                     lda     subfcb+15        ;set current record to end
+                     sta     subfcb+32
+                     jmp     51dh             ;jump if open ok
+             ;
+                     org     subfcb
+                     db      1                ;force $$$.sub file to A:
+             ;
+                     end
+
+
+               Assemble SUBPATCH ASM to create the file SUBPATCH.HEX.  Then use
+          DDT  to  insert  SUBPATCH.HEX  into  the SUBMIT.COM program, as shown
+          below.
+
+                    A>ddt submit.com
+                    DDT VERS 2.2
+                    NEXT  PC
+                    0600 0100
+                    -isubpatch.hex
+                    -r
+                    -g0
+                    A>save 5 submit1.com
+
+
+               In the new program SUBMIT1.COM, control returns to the  original
+          SUBMIT file after the system executes embedded SUBMIT commands.
+
+               Licensed  users  are  granted  the  right   to   include   these
+          modifications in CP/M V2.1 and V2.2 software.