RCA 301 Programmer's Reference Manual page 202

Op.
Instruction
Code
Specifies Data Disc
Track Select
D
File to select
R (First Data Disc File)
Z (Second Data Disc
2° = 0, returns record to
Band Select Record
E
File Mode
2° = 1, band selected is
Bits 2* - 2
File from which band is
to be selected
2
F Block Read
number of blocks to be
Record Normal
read.
2* = 0, selects first file
2
Specifies additional
Sector Read
F
number of sectors to be
Disc Normal
read and file selected
2
Block Read
G
number of blocks to be
Record
Simultaneous read
2
2
Specifies Additional
Sector Read
G
number of sectors to be
Disc
Simultaneous
Block Write Record
H
Normal
C-3
N
Must be zeros (0000)
File)
Must be zeros (0000)
cage before selection.
on turntable.
5
= Record
3 2 HSM address where first
, 2 , 2", 2° se lects
character is to be placed
4
= 1, selects second file
Address of HSM
location to receive
first character read
HSM address where first
s 2 selects
, 2 , 2\ 2°
character is to be placed
4
= 0, selects first file
4
= 1, selects second file
Address of HSM
location to receive first
character read
read and file selected
a 2 HSM address where first
2 , 2 , 2', 2° selects
character is to be written
number of blocks to be
written
4
2 = 0, selects first file
1
2 = 1, selects second file
APPENDIX C. S UMMARY
A Address
Bo = Must be zero (0)
B,, Ba, Bo sele cts track (000-127)
Bo = Must be zero (0)
Bi, Bo, B> desig nates band (000-511).
Bo = Must be zero (0)
Bi = odd —- recor d returned to cage after
operation
Bi = even — record stays on turntable
and arm is placed at beginning of
selected band after operation
Bj = 1 — block terminated on counting
900 characters
Bo = 0 — count or EB recognition.
Bj = addresses cells 1-10
Bo = designates first sector to be read
Bi, Bo, Bo s pecifies zone to be read from
4 of Bo
2 = 0,
instruction 2* of Bo = 1, permits over­
ride of any Data Disc File Simultaneous
instruction. Bi, B-, Bo, specifies zone to
be read from
Bo = Must be zero
Bi = odd — record returned to cage after
operation.
= even — record stays on turntable
Bi
and arm is placed at beginning of
selected band after operation
Ba = 1 — block terminated on counting
900 characters
B, = 0 — count or EB recognition
B = address cells
3
2", 2", 2', 2°
sector to be read
of
2 4 Bo = 0,
instruction
ride of any Data Disc File Simultaneous
instruction.
be read from
= Must be zero (0)
Bo
Bi = odd-record returned after operation
Bi = even-record stays on turnable and
arm is placed at beginning of
selected band after operation
Ba = 1 — block terminates on counting
900 characters
= 0 — count or
Ba
B3 — addre sses cells 1-10
B Address
prevents override of SRS
(0)
1-10
bits of designates first
Bo
prevents override of SRS
of permits over­
2* Bo = 1,
specifies zone to
Ba, Ba, Ba,
recognition
EB
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