From: robertapengelly@gmail.com   
      
   On Monday, 13 November 2023 at 09:38:25 UTC, wolfgang kern wrote:   
   > On 13/11/2023 10:11, Robert Pengelly wrote:   
   > > On Monday, 13 November 2023 at 09:01:29 UTC, wolfgang kern wrote:   
   > >> On 13/11/2023 09:49, Robert Pengelly wrote:   
   > >>> On Monday, 13 November 2023 at 08:37:18 UTC, wolfgang kern wrote:   
   > >> ...   
   > >>>> I found my hand written notes from 1980 on Serial Mice now,   
   > >>>> two button standard:   
   > >>>> 1200 baud, No Parity, 7(or8)bit, 1 stop bit   
   > >>>> 1st byte   
   > >>>> 7 * don't care   
   > >>>> 6 == 1 sync bit   
   > >>>> 5 Right Button Down   
   > >>>> 4 Left Button Down   
   > >>>> 3 b7 Y   
   > >>>> 2 b6 Y   
   > >>>> 1 b7 X   
   > >>>> 0 b6 X   
   > >>>> 2nd byte   
   > >>>> 7 *   
   > >>>> 6 == 0   
   > >>>> 5..0 b5..0 X   
   > >>>> 3rd byte   
   > >>>> 7 *   
   > >>>> 6 ==0   
   > >>>> 5..0 b5..0 Y   
   > >>>> assume BX points to buffer yet   
   > >>>>>>> mov cl, [bx + 2]   
   > >>>> AND CL, 0x7f ;can't be sure for b7==0   
   > >>>> ;missed to sign extend AX,AL   
   > >>>> CBW makes AX sign extended from AL   
   > >>>> or ax, cx OK insert low 6 bits   
   > >>>>   
   > >>>> ADD [mouse_y],AX it does a SUB if AX is negativ   
   > >>>> mov cl, [bx + 1]   
   > >>>> AND CX,0x7f   
   > >>>> MOV AL,DL   
   > >>>> CBW   
   > >>>> OR AX,CX   
   > >>>> ADD [mouse_x],AX   
   > >>>> DONE:   
   > >> ...   
   > >>> Just as I was going to reply you sent that last message. Anyways this   
   seems to work:   
   > >>>   
   > >>> xor ax, ax   
   > >>> xor dx, dx   
   > >>> xor cx, cx   
   > >>> mov bx, offset buffer   
   > >>>   
   > >>> mov al, [bx]   
   > >>> and al, HEX (0C)   
   > >>>   
   > >>> mov cl, 4   
   > >>> shl ax, cl   
   > >>>   
   > >>> cbw   
   > >>>   
   > >>> mov cl, [bx + 2]   
   > >>> or ax, cx   
   > >>> add [mouse_y], ax   
   > >>>   
   > >>> mov al, [bx]   
   > >>> and al, HEX (03)   
   > >>>   
   > >>> mov cl, 6   
   > >>> shl ax, cl   
   > >>>   
   > >>> cbw   
   > >>>   
   > >>> mov cl, [bx + 1]   
   > >>> or ax, cx   
   > >>> add [mouse_x], ax   
   > >>>   
   > >>> but not sure if it's right or not. You did just have "CBW makes AX sign   
   extended from AL" so maybe the code is right.   
   > >> Fine so far, you rely on b7=0 in first byte which may cause errors.   
   > >> you could check of the first byte got a sync bit to avoid jumping mice.   
   > >> __   
   > >> wolfgang   
   > > I'm a little confused by :   
   > >   
   > > you rely on b7=0 in first byte which may cause errors.   
   > > you could check of the first byte got a sync bit to avoid jumping mice.   
   > >   
   > > You had:   
   > >   
   > > 1st byte   
   > > 7 * don't care   
   > > 6 == 1 sync bit   
   > > 5 Right Button Down   
   > > 4 Left Button Down   
   > > 3 b7 Y   
   > > 2 b6 Y   
   > > 1 b7 X   
   > > 0 b6 X   
   > >   
   > > in your previous message, do you mean bit 6 (i.e. the sync bit). If you do   
   should I do something like:   
   > >   
   > > test al, 0x40   
   > > jnz .done   
   > >   
   > > before the updating code   
   > yes, but you can do it already in the IRQ routine.   
   > __   
   > wolfgang   
   >   
   > I posted this a few days ago:   
   > push ...ds,ax,bx,cx,dx   
   > ... ds become ptr to my data   
   > IN AL,port   
   > TEST AL,0x40   
   > jz skip_init   
   > xor bx,bx   
   > MOV CX,3 ;(or eight in my case)   
   > MOV [count],cl   
   > MOV [index].bx   
   > skip_init:   
   > MOV BX,[index]   
   > MOV [BX+buffer],AL   
   > INC word[index] ;or: INC BX |MOV [index],BX   
   > DEC byte[count]   
   > pop ... dx,cx,bx   
   > MOV AL,0x20   
   > out 0xA0,AL   
   > jnz done_it   
   > got_all:   
   > ;store/modify, update only variables, actions are done in idle queue.   
   > done_it:   
   > pop ax   
   > pop ds   
   > iret   
   Yeah, I have.  Thanks for all the help.   
      
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