keyboard part of CHRIN now preserves .Y

STATUS.md

@@ -132,7 +132,7 @@ NOTE: Even the 'DONE' routines won't support features described as missing in on
 | `$FFC6`   | `$F20E`    | `CHKIN`     | DONE     |                                                      |
 | `$FFC9`   | `$F250`    | `CKOUT`     | DONE     |                                                      |
 | `$FFCC`   | `$F333`    | `CLRCHN`    | DONE     |                                                      |
-| `$FFCF`   | `$F157`    | `CHRIN`     | PARTIAL  | no screen support, keyboard does not preserve .Y     |
+| `$FFCF`   | `$F157`    | `CHRIN`     | PARTIAL  | no screen device support                             |
 | `$FFD2`   | `$F1CA`    | `CHROUT`    | DONE     |                                                      |
 | `$FFD5`   | `$F49E`    | `LOAD`      | DONE     |                                                      |
 | `($0330)` | `$F4A5`    | `LOAD`      | DONE     |                                                      |