Upload

Digital Research
2025-10-24 08:54:17 +00:00 · 2020-11-06 18:50:37 +01:00
parent 621ed8ccaf
commit 31738079c4
8481 changed files with 1888323 additions and 0 deletions
--- a/2.2/PATCHES/CPM22APN.07
+++ b/2.2/PATCHES/CPM22APN.07
@@ -0,0 +1,77 @@
+                                       CP/M   V2.2
+                              Application Note 07, 2/20/82
+                           Changing the Restart Number in DDT
+
+                          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    V1.4,  V2.0,  V2.1,
+          and V2.2
+
+          Program:  DDT.COM
+
+               DDT   uses RST 7 (machine instruction 0FFH) to set break points.
+          To  change the restart number, modify the three bytes indicated by ??
+          in  the  following  procedure  for  a  new  restart  instruction  and
+          location.  The  restart  instruction  uses  the bit pattern 11XXX111,
+          where XXX is the restart number you use.  (AFH is RST 1, B7H  is  RST
+          2,  and  BFH  is RST 3.)  The restart location is usually the restart
+          number times 8.  Do not use RST 0 because it is reserved for CP/M.
+
+               The following procedure applies to DDT supplied with  CP/M  V2.1
+          and  V2.2.  For V1.4 and V2.0, change the instructions at 19B and 19E
+          to the following:
+
+                  019B  sta  fe4
+                  019E  sta  10ee
+
+               Make a back-up copy of DDT.COM before you use DDT  to  make  the
+          following changes:
+
+                  A>ddt ddt.com
+                  DDT VERS 2.2
+                  NEXT  PC
+                  1400 0100
+                  -l103
+                    103  JMP  013D
+                          .
+                          .
+                          .
+                  -a103
+                  0103  jmp  18b
+                  -a18b
+                  018B  lhld 1ec
+                  018E  shld 8e7
+                  0191  inx  h
+                  0192  shld 8ed
+                  0195  lda  1eb
+                  0198  sta  ad5
+
+
+
+                                          1
+
+          CP/M V2.2                                     Application Note 07
+
+
+                  019B  sta  fea
+                  019E  sta  10f4
+
+
+                  01A1  jmp  13d
+                  - s1ec
+                  01EB ?? f7
+                  01EC ?? 30
+                  01ED ?? 00
+                  01EE ?? .
+                  -g0
+                  A>save 19 ddt6.com
+
+
+               To change the restart number for DDT in the future, modify  only
+          the 3 bytes 1EBH, 1ECH and 1EDH.
+
+               Licensed  users  are  granted  the  right   to   include   these
+          modifications in CP/M software.