INT 21,A - Buffered Keyboard Input

AH = 0A

DS:DX = pointer to input buffer of the format:

¦ max ¦ count ¦ BUFFER (N bytes)

¦ ¦ +------ input buffer

¦ +------------ number of characters returned (byte)

+-------------- maximum number of characters to read (byte)

returns nothing

- since strings can be pre-loaded, it is recommended that the

default string be terminated with a CR

- N bytes of data are read from STDIN into buffer+2

- max buffer size is 255, minimum buffer size is 1 byte

- chars up to and including a CR are placed into the buffer

beginning at byte 2; Byte 1 returns the number of chars

placed into the buffer (extended codes take 2 characters)

- DOS editing keys are active during this call

- ~INT 23~ is called if Ctrl-Break or Ctrl-C detected