26 Feb
2009
26 Feb
'09
6:05 p.m.
Many OS-es of the era could open the punch in column
binary (or row
binary for some others) and punch whatever they wanted. CDC 6000
series object decks, were, IIRC, column binary.
I have never seen 6000 series binary card decks, but the source code
says you're right:
*** 3446/415 DRIVER CHARACTERISTICS.
*
* HOLLERITH CARDS ARE PUNCHED FROM A LINE CONSISTING OF UP TO
* 90 CHARACTERS. HOWEVER, ONLY THE FIRST 80 CHARACTERS
* OF THE LINE ARE ACTUALLY PUNCHED. THE DISPLAY CODE
* TO O26/O29 CONVERSION IS ACCOMPLISHED BY A
* DISPLAY CODE TO BINARY COLUMN IMAGE CONVERSION IN THE
* DRIVER. THE CARD IS THEN PUNCHED IN BINARY MODE
* ON THE 3446.
*
* BINARY DATA ARE PUNCHED IN THE FOLLOWING FORMAT
* COLUMN 1 = WORD COUNT AND BINARY CARD INDICATOR (79)
* COLUMN 2 = BINARY DATA CHECKSUM MODULO 4095
* COLUMNS 3 - 77 = 15 CENTRAL WORDS OF DATA
* COLUMN 78 = BLANK
* COLUMNS 79 - 80 = 24 BIT BINARY CARD SEQUENCE NUMBER
*
* ABSOLUTE BINARY DATA ARE PUNCHED 16 CENTRAL WORDS/CARD WITH
* NO SPECIAL PUNCHES.
paul