From: nowhere@never.at   
      
   On 12/11/2023 15:41, Robert Pengelly wrote:   
   > On Sunday, 12 November 2023 at 14:07:11 UTC, wolfgang kern wrote:   
   >> On 12/11/2023 14:08, Robert Pengelly wrote:   
   >> ...   
   >>> ps2_wait_input:   
   >>>   
   >>> push ax   
   >>> mov cx, HEX (FFFF)   
   >>>   
   >>> ps2_wait_input.loop:   
   >>   
   >>   
   >>   
   >>> xor ax, ax   
   >> this isn't needed at all   
   >>> in al, HEX (64)   
   >>>   
   >>> and al, 0b00000010   
   >>> jz ps2_wait_input.done   
   >>>   
   >>> loop ps2_wait_input.loop   
   >>>   
   >>> ps2_wait_input.done:   
   >>>   
   >>> pop ax   
   >>> ret   
   >> it may return too early if your PC is faster than 12MHZ :)   
   >> I'd use the DOS timer variable (can't remember it's at 40:xxxx ?)   
   >>   
   >> push ax   
   >> push cx   
   >> push es   
   >> push 0x40 ;or use the longer MOV AX,0x0040 |MOV ES,AX   
   >> pop es   
   >> mov cx,[es:dostick]   
   >> add cx,2   
   >> L1:   
   >> IN AL,0x64   
   >> TEST AL,2   
   >> jz DONE   
   >> cmp cx,[es:dostick]   
   >> jb L1   
   >> done:   
   >> pop,,,, ret   
      
      
   > Most of the "xor ax, ax" are left over from me zeroing it out ready for   
   printing to make things a little easier to read.  And that's a good idea.   
      
   how about MOV AH.00 upfront once ?   
      
   >  I may need the longer version as I'm targeting 8086.   
      
   oh you work in a museum ? :)   
   __   
   wolfgang   
      
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