Editing IBM 3270 (section)

====Commands====

The following table includes datastream commands and CCW opcodes for local non-SNA controllers; it does not include CCW opcodes for local SNA controllers.

<!-- Add page number for each command from 3270 Data Stream 0r 3274 Description. -->
{| class="wikitable"
|+3270 commands{{sfn|3274 Description|loc=Figure 1-8. Command Codes|p=1-14}}
! scope="col" | Command
! scope="col" colspan=3 | Hexadecimal
! scope="col" |Graphic
! scope="col" | Function
|-
! scope="col" |
! scope="col" | local<br />non-SNA
! scope="col" | EBCDIC
! scope="col" | ASCII
! scope="col" | 
! scope="col" |
|-
| Copy{{efn|name=BSC}}
| {{n/a}}
| F7
| 37
| 7
| Copy from one device buffer to another, e.g., from a display to a printer
|-
| Erase All Unprotected{{sfn|3270 Data Stream|loc=Erase All Unprotected (EAU) Command|p=3-7}}
| 0F
| 6F
| 3F
| ?
| Erase all unprotected fields and reset modified data tags
|-
| Erase/Write{{sfn|3270 Data Stream|loc=Erase/Write Command|p=3-6}}
| 05
| F5
| 35
| 5
| Erase device buffer, then write WCC followed by orders and data
|-
| Erase/Write Alternate{{efn|Not available on 3271, 3272 or 3275|name=alternate}}{{sfn|3270 Data Stream|loc=Erase/Write Alternate Command|p=3-6}}
| 0D
| 7E
| 3D
| =
| Erase device buffer, set alternate size, then write WCC followed by orders and data
|-
| No Operation
| 03
| {{n/a}}
| {{n/a}}
| {{n/a}}
| May be used to retrieve pending status
|-
| Read Buffer{{sfn|3270 Data Stream|loc=Read Buffer Command|pp=3-11—3-12}}
| 02
| F2
| 22
| 2
| Read entire device buffer, including attributes
|-
| Read Modified{{sfn|3270 Data Stream|loc=Read Modified Command|pp=3-12—3-13}}
| 06
| F6
| 36
| 6
| Read AID, cursor and, except for short read, modified fields from device
|-
| Read Modified All{{sfn|3270 Data Stream|loc=Read Modified All Command|pp=3-13—3-14}}
| {{n/a}}
| 6E
| 3E
| :
| Read AID, cursor and modified fields from device; no short read
|-
| Select{{sfn|3274 Description|loc=Select Command (3274 B Units)|p=1-70}}
| 0B
| {{n/a}}
| {{n/a}}
| {{n/a}}
| Transfer data from device to control unit with channel disconnected
|-
| Select RB{{efn|Only available on 3274 D models and 3174|name=3274D}}{{sfn|3274 Description|loc=Select Read Buffer (RB) Command (3274 D Units)|p=1-71}}
| 1B
| {{n/a}}
| {{n/a}}
| {{n/a}}
| Select Read Buffer;<br />may only be chained to Read Buffer
|-
| Select RBP{{efn|name=3274D}}{{sfn|3274 Description|loc=Select Read Buffer from Position (RBP) Command (3274 D Units)|p=1-72}}
| 3B
| {{n/a}}
| {{n/a}}
| {{n/a}}
| Select Read Buffer from Position;<br />may only be chained to Read Buffer
|-
| Select RM{{efn|name=3274D}}{{sfn|3274 Description|loc=Select Read Modified (RM) Command (3274 D Units)|p=1-71}}
| DB
| {{n/a}}
| {{n/a}}
| {{n/a}}
| Select Read Modified
|-
| Select RMP{{efn|name=3274D}}{{sfn|3274 Description|loc=Select Read Modified from Position (RMP) Command (3274 D Units)|p=1-71}}
| 2B
| {{n/a}}
| {{n/a}}
| {{n/a}}
| Select Read Modified from Position
|-
| Select WRT{{efn|name=3274D}}{{sfn|3274 Description|loc=Select WRT Command (3274 D Units)|p=1-72}}
| 4B
| {{n/a}}
| {{n/a}}
| {{n/a}}
| Select WRT Command<br />May only be chained to a Write or Write Structured Field 
|-
| Sense{{sfn|3274 Description|loc=Sense Command (3274 Band D Units)|p=1-73}}
| 04
| {{n/a}}
| {{n/a}}
| {{n/a}}
| Retrieve error information after unit check
|-
| Sense ID{{efn|name=alternate}}{{sfn|3274 Description|loc=Sense ID Command (3274 Band D Units)|p=1-73}}
| E4
| {{n/a}}
| {{n/a}}
| {{n/a}}
| Retrieve control unit identification
|-
| Write{{sfn|3270 Data Stream|loc=Write Command|p=3-5}}
| 01
| F1
| 31
| 1
| Write WCC followed by orders and data
|-
| Write Structured Field{{efn|name=alternate}}{{efn|name=extended}}{{sfn|3270 Data Stream|loc=Write Structured Field Command|p=3-7}}
| 11
| F3
| {{n/a}}
| 3
| Write Structured Field
|-
| colspan=6 | For remote 3270s non-significant bits are set so that the command forms a valid EBCDIC (or ASCII) character.
|}