Hopefully fixed literals and implemented most instructions

README.md

@@ -99,6 +99,7 @@ CR |`( -- )`                        |In the command mode, output a line break an
 `*`|`( a b -- a*b )`                |Product
 `/`|`( a b -- a/b rem )`            |Integer division (with remainder)
 `N`|`( a -- -a )`                   |Single-instruction negation (complement to 65536)
+`T`|`( a XY -- [a >> X] << Y )`     |Bitwise shif**t**: by the first nibble to the right and then by the second nibble to the left
 `~`|`( a -- ~a )`                   |Bitwise NOT
 `&`|`( a b -- a&b )`                |Bitwise AND
 `\|`|`( a b -- a\|b )`              |Bitwise OR
@@ -106,7 +107,7 @@ CR |`( -- )`                        |In the command mode, output a line break an
 `.`|`( a -- ) `                     |Output a character by the ASCII (or Unicode, if supported) value into the standard terminal
 `,`|`( -- a ) `                     |Non-blocking key input of an ASCII (or Unicode, if supported) value from the standard terminal
 `?`|`( -- a ) `                     |Blocking key input of an ASCII (or Unicode, if supported) value from the standard terminal
-`P`|`( p1 p2 port -- status r1 r2 )`|**P**ort I/O: pass two 16-bit parameters to the port and read the operation status and results into the words on the stack top
+`P`|`( p1 p2 port -- r1 r2 status )`|**P**ort I/O: pass two 16-bit parameters to the port and read the operation status and results into the words on the stack top
 `}`|`( adh adl len maddr -- status)`|Persistent storage write operation. Stack parameters: persistent address high 2 bytes, low 2 bytes, data length, RAM address
 `{`|`( adh adl len maddr -- status)`|Persistent storage read operation. Stack parameters: persistent address high 2 bytes, low 2 bytes, data length, RAM address
 `Q`|`( -- )`                        |**Q**uit the interpretation mode (unset IM flag if set), or the interpreter shell itself if in command mode (halt the machine when it's nowhere to exit to)