The 5N Disk File DLP (style Bx373-90) is used to connect a medium or v-series system to a Head-Per-Track subsystem . A 5N subsystem consists of a B9471-6 5N DFEU (Disk File Electronics Unit) and one or more B9470-1 or B9740-11 5.9MB DFSU (Disk File Storage Units)

The 5N could be exchanged using the Bx377-6 Exchange.

I/O Descriptors

Operation SYS OP MLI OP S L1 L2 L3 Addresses Used?
READ 50 8
Data/Unconditional * 0 U 0 A-B, C Yes
Transfer/Unconditional * 2 U 0 A-B, C
Maint/Unconditional * 8 U 0 A-B, C
Extended Status * D 0 0 A-B, C Yes
Unit Status * E U 0 A-B, C Yes
Buffer 40 * F U 0 A-B, C
WRITE 52 4
Data/Unconditional * 0 U 0 A-B, C Yes
Maint/Unconditional * 8 U 0 A-B, C
Buffer 42 * F U 0
TEST 44 2
Unit * 0 U 0 Yes
Wait Available * 1 U 0 ?
Wait Not Available * 2 U 0 ?
+ Verify 54 * 4 U 0 A-B, C Yes
Conditional Cancel * 8 U 0 ?
ID * C 0 0 ?

U designates unit number.

Command Formats

4X series system opcodes have two addresses. The A and B addresses are the start and end of the memory transfer buffer. Some operations do not transfer any data other than the command and result descriptors. The A and B addresses are typically set to 0 in this case.

5X series system opcodes have three addresses. The A and B addresses are the start and end of the memory transfer buffer. The C address contains 8 digits of extra parameters for the command. In this case the first 6 digits are the disk sector address in decimal.

5N Disk File DLP Result Descriptor Word 1

A B C D
8 DEVICE
NOT
READY
EARLY
TERM-
INATION
INCORRECT
STATE
BUFFER
PARITY
ERROR
4 DESCRIPTOR
ERROR
READ
EXTENDED
STATUS
DISCONTINUED ZERO
2 VERTICAL
PARITY ERROR
(MLI)
ZERO DATA
ERROR
ZERO
1 LONGITUDINAL
PARITY
ERROR
(MLI)
INVALID
INFO-
RMATION
ZERO EXCEPTION

5N Disk File DLP Result Descriptor Word 2

A B C D
8 DISK
STORAGE
UNIT NOT
READY
DATA
TRANS-
MISSION
ERROR
RSB
PARITY
ERROR
ZERO
4 WRITE
LOCKOUT
WARNING EXCHANGE
ERROR
DATA
CORRECTED
(FROM ECC)
2 ADDRESS
ERROR
ZERO TIMEOUT DATA READ
ERROR
(FROM ECC)
1 COMMAND
TRANS-
MISSION
ERROR
ZERO ZERO EXTRA
DISK
REVOLUTION

5N Disk File TEST/ID Result Descriptor Word 2

A B C D
8 0 1 X X
4 0 0 X X
2 0 1 X X
1 0 0 X X

X - field installed jumpers (not used for medium systems)

Each 5N Disk File DLP can be jumpered with a specific code. This code is not used by the V Series MCP and is typically left unjumpered, returning a value of 00. (This feature was implemeted for the Large Systems MCP.)

dlps/5n_disk.txt · Last modified: 2012/02/04 15:12 by scott
 
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