AH = 01h - Set Cursor Size

This function sets the size of the cursor displayed in the Text Display modes. The character cell is h pixels lines high with the lines numbered from 0 (top of cell) through h-1 (bottom of cell). The cursor size is specified by giving the beginning and ending scan line numbers within bits 0-4 of CL and CH. The beginning and ending cursor scan lines are written to BIOS RAM in two bytes beginning at 40:60h (1st byte = end scan, 2nd byte = begin scan). Bits 5 and 6 of CH are cursor control bits and govern the operation of the text mode character.

• Input: AH = 01h

CH[6-5] = Cursor Control
CH[0-4] = Beginning Scan Line Number
CL[0-4] = Ending Scan Line Number

• Output: None
• Error conditions: None
• Registers modified: AX

          Cursor Control
          -----------------------------------------
          Value  Description
          00     Blinking Cursor at 1 Hz
          01     No Cursor 
          10     Blinking Cursor at 1/2 Frame Rate
          11     Non-Blinking Cursor
          

• Setting cursor control to 01 will reliably suppress the cursor. A less desirable alternative is to position the cursor to a nondisplayable address [e.g.; (xy)=(0,25)]. Cursor tracking in zoomed text modes will not follow the cursor off of the logical page.
• The input parameter register (CX) is written unchanged to the RAM variable CURTYPE.
• It is assumed that callers of this service know nothing about the palmtop's Zoom feature and have supplied input parameters based on the standard 8x8 character cell. If the display is in a zoomed state, the START and END parameters are scaled before writing to the display controller hardware to maintain the "intent" of the call.
• The HP 95LX has no Cursor End (hard coded to 7) register. This may result in erratic (or missing) cursors for HP 95LX application code running on the HP palmtop.