ANSI modes
The 22 modes ECMA-48 numbers, set with CSI Pm h and reset with CSI Pm l (SM and RM), each named by a number with no ? in front. ECMA-48 calls the first state of each the reset state and recommends it as the default.
Most of them are for block-mode terminals, which edit a screen locally and send it to the host, or for devices that handle bidirectional text, and DEC’s terminals took up only four: KAM, IRM, SRM and LNM. xterm and libghostty-vt take the same four and ignore the rest, but answer differently when DECRQM asks about them: xterm reports most of them as permanently reset, as the VT510 does, and libghostty-vt as not recognized.
The modes with a ?, which DEC and xterm defined, are the private modes.
| 1 | GATMGuarded Area Transfer Mode | CSI 1 h |
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|---|---|---|---|
| 2 | KAMKeyboard Action Mode | CSI 2 h |
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| 3 | CRMControl Representation Mode | CSI 3 h |
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| 4 | IRMInsertion Replacement Mode | CSI 4 h |
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| 5 | SRTMStatus Report Transfer Mode | CSI 5 h |
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| 6 | ERMErasure Mode | CSI 6 h |
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| 7 | VEMLine Editing Mode | CSI 7 h |
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| 8 | BDSMBi-directional Support Mode | CSI 8 h |
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| 9 | DCSMDevice Component Select Mode | CSI 9 h |
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| 10 | HEMCharacter Editing Mode | CSI 10 h |
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| 11 | PUMPositioning Unit Mode | CSI 11 h |
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| 12 | SRMSend/Receive Mode | CSI 12 h |
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| 13 | FEAMFormat Effector Action Mode | CSI 13 h |
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| 14 | FETMFormat Effector Transfer Mode | CSI 14 h |
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| 15 | MATMMultiple Area Transfer Mode | CSI 15 h |
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| 16 | TTMTransfer Termination Mode | CSI 16 h |
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| 17 | SATMSelected Area Transfer Mode | CSI 17 h |
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| 18 | TSMTabulation Stop Mode | CSI 18 h |
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| 19 | EBMEditing Boundary Mode | CSI 19 h |
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| 20 | LNMLine Feed/New Line Mode | CSI 20 h |
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| 21 | GRCMGraphic Rendition Combination Mode | CSI 21 h |
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| 22 | ZDMZero Default Mode | CSI 22 h |
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