C65 Peripheral Control Utilization

 6526 cia complex interface adapter #1
   keyboard / joystick / paddles / mouse / lightpen / fast serial
    
   pra0 : keybd output c0 / joystick #1 up      / mouse right button
   pra1 : keybd output c1 / joystick #1 down
   pra2 : keybd output c2 / joystick #1 left    / paddle "A" fire button
   pra3 : keybd output c3 / joystick #1 right   / paddle "B" fire button
   pra4 : keybd output c4 / joystick #1 fire    / mouse left. button
   pra5 : keybd output c5
   pra6 : keybd output c6                       / select port #1 paddles|mouse
   pra7 : keybd output c7                       / select port #2 paddles|mouse
    
   prb0 : keybd input  r0 / joystick #2 up      / mouse right button
   prb1 : keybd input  r1 / joystick #2 down    / paddle "A" fire button
   prb2 : keybd input  r2 / joystick #2 left    / paddle "B" fire button
   prb3 : keybd input  r3 / joystick #2 right
   prb4 : keybd input  r4 / joystick #2 fire    / mouse left button
   prb5 : keybd input  r5 /
   prb6 : keybd input  r6 / timer b: toggle/pulse output
   prb7 : keybd input  r7 / timer a: toggle/pulse output
    
   timer 1 & cra : fast serial
   timer 2 & crb :
    
   tod    :
   sdr    :
   icr    :
    
 6526 cia complex interface adapter #2
     user port / rs232 / serial bus / V2C bank / NMI

    praO : va14   VIC 16K bank select
    pral : va15
    pra2 : rs232  DATA output                     (C64 mode only)
    pra3 : serial ATN output
    pra4 : serial CLK output
    pra5 : serial DATA output
    pra6 : serial CLK input
    pra7 : serial DATA input

    prbO      user port / rs232 received data     (C64 mode only)
    prbl      user port / rs232 request to send
    prb2      user port / rs232data terminal ready
    prb3      user port / rs232 ring indicator
    prb4      user port / rs232 carrier detect
    prb5      user port
    prb6      user port / rs232 clear to send
    prb7      user port / rs232 data set ready
    
    timer 1 & cra :       rs232 baud rate         (C64 mode only)
    timer 2 & crb :       rs232 bit check         (C64 mode only)
    
    tod    :
    sdr    :
    icr    : nmi (/irq)