U UNIVAC 1218 - Bitsavers

Entrance
Address
Base Address + 4
TABLE IV-A-l. UPAK I ENTRANCE ADDRESS (CONT.)
+ 6
+10
+12
+14
+16
+20
+22
+26
2.1 PAPER TAPE LOAD
Type of Entry and
Routine Entered
Programmed entrance. Paper tape
absolute typewriter code dump
Manual entrance. Paper tape load
Manual entrance. Paper tape
absolute typewriter code dump
Manual entrance. Paper tape
absolute bioctal dump
Inspect and change
Store constant in memory
Search memory
Copy paper tape
Typewriter dump
The paper tape load routine consists of a load selector and three load subroutines.
The load selector reads paper tape until a nonzero frame is
found. It then examines the nonzero frame to determine the type of tape to
be loaded, and calls one of the three load subroutines to load the tape. The
table below lists the criteria used to select the load subroutine.
Nonzero Frame
75
76
All other codes
2.101 LOAD ABSOLUTE TYPEWRITER CODE
Subroutine Called
Load relocatable bioctal code
Load absolute bioctal code
Load absolute typewriter code
A carriage return followed by either an 8 or an 88 and another carriage
return normally activates this load subroutine. A single 8 indicates the input
tape has no checksum; and 88 indicates the input tape has a checksum. The
subroutine ignores any data which may precede either of these two combinations.
Each tape instruction is preceded by a 5-digit address. Addresses need not
be sequential; however, all five digits must be present. The next 6 digits
constitute the instruction to be loaded; all six digits must be present. The
IV-A-2