RCA 301 Programmer's Reference Manual page 90

Automatic card translation does not take place if the BCT button on the Computer Console Panel is in the
"on" position. Each card column is then split into two groups of six bits each, a parity bit is generated and ad ed
to each group, and the resultant two characters are transferred into HSM.
The character represented by rows 9 through 4 in column 1 (row 9 = 2
location specified by the A Register. Successive characters representing rows 9 through 4 are also read into memory
with column 80 being placed at (A), + 79- T he character represented by column 1, rows 3 through Y (row 3 - 2
Y = 2°) is read into HSM at (A), + 80. Successive characters representing rows 3 through Y are likewise read
row
into HSM with column 80 being placed at (A)i + 159. The final A Register setting is (A), + 160.
Final Register Contents
(A) = One location to the right of the last character read into HSM.
t
(B) = (A)j with BCT off.
t
(B), = (A)j + 80 with BCT on.
Timing
Card Feed Rate
Per Minute
600
300
up to 200
* ±1.5%
Example
Instruction:
Operation
0
HSM after Instruction is Executed (with BCT on):
1000
-< DATA FROM CARD
(rows 9 through 4)
Col. 1
HSM after Instruction is Executed (with BCT off):
Final Register Contents:
(A), = 1160 (BCT on)
(A), = 1080 (BCT off)
(B) = 1080 with BCT on
(
(B) — 100 0 with BCT off
f
Time:
100 (±1.5%) milliseconds (20 (±1.5%) milliseconds free for computing).
VIII-4
Time in
Milliseconds
100*
200*
300 (Minimum)
N
4
1079
•
Col. 80
1000
h a t a f rom ca rd -
Col. 1
5
, row 4 = 2") is read into HSM at the
Time Free
For Computing
20*
120*
20 (Minimum)
A Address
1000
1080
DATA FROM CARD
(rows 3 through Y)
Col. 1
1079
w
Col. 80
5
B Address
0000
H59
•
Col. 80