Following the *BAS card will be one or more binary cards similar to this one. These cards
all have punchings in rows 7 and 9 of column 1 and all but the last have
additionally a punch in the + row of column 1. They will have been serially
numbered in columns 79 and 80. Each binary card carries a checksum of all
internal information. The use of this checksum may be suppressed by punching
row 0 in column 1.
The binary cards contain information which can be loaded into any part
of memory in such a way that the routine may operate there. The information
found in rows 2 to 6 of column 1 is a binary count with the units
position in row 6, and is a count of the number of words of information on
the card. The other columns of binary cards are used as follows:
Columns 2,3,4
contains the relocation bits to indicate whether
a particular 24 bit halfword is to be incremented by the
value of the initial loading address of the routine.
The punching is described below.
Columns 5,6
contain a 24 bit checksum of all the information on the
card. The checksum is such that the logical sum (with
end-around-carry) of the information in column 1 to 8
and of the information words contained in column 9
onwards is 77777777 octal
Columns 7,8
contains the loading address relative to the start of the
routine of the first information word to be loaded.
Column 9 onwards
Each word of information occupies four columns, the first
in column 9 to 12, the second in columns 13 to 16 and so on.
From a group of columns the lower numbered columns
represent the most significant binary digits of a word.
Each word is treated for relocation as two separate 24
bit halfwords. The relocation bits in column 2 refer
to the words contained in columns 9 to 32, the bits in
column 3 to the words in columns 33 to 56 and those in
column 4 to the words of columns 57 to 72. The relocation
bits of a column are taken in turn from the + row
down to the 9 row. A punch indicates that the 24 bit
halfword is to be incremented by the initial loading
address of the routine and the + row refers to the first
pair of columns, the - row to the second and so on.
The information on the card shown can be decoded as follows:
Column 1
The columns punched are:
+ Not the last card
2 16 words on the card
7 BAS Card
9 BAS Card
So this is one card of a set for a subroutine and it is not the last and contains the full complement of 16 48-bit words.
Relocation: Columns 2 to 4
The punched holes indicate that:
Column 2
- Word 00 address is relocatable
3 Word 02 address is relocatable
7 Word 04 address is relocatable
Column 3
- Word 06 address is relocatable
1 Word 07 address is relocatable
9 Word 13 address is relocatable
Column 4
1 Word 15 address is relocatable
3 Word 16 address is relocatable
Base Address of Card (Columns 7,8)
these two columns indicate that the base address in octal is 0000304.0
The Instructions
The layout of the 4 columns is on the assumption that it is an instruction
so the shaded area is the first modifier and the next 7 bits is the second modifier.
The last two columns of the four give the address.
This gives the following instructions
