  0 PAK 68/3, GAL U6:  Adressdekoder, Atari ST
  1 16-09-93   V6_STc1   Holger Zimmermann @ PE
  2 %ID
  3    P6_ST
  4 %TYP
  5    GAL20V8A
  6 %PINS
  7  !vpa  fc0  fc1  !as_20  a21  a20  a17  a18  a16  a19  a22
  8  !berr_00  a23  !avec  !dram  !ciin  !word  !fpucs  !rom  !csp19
  9  !berr_20  !jp3
 10 %LOGIC
 11 
 12  berr_20.OE = VCC;
 13  berr_20    = as_20 * fc1 * fc0 * !a19 * !a17              ´PMMU, BKPT
 14             + as_20 * fc1 * fc0 * !a19 *  a17 * !jp3     ´FPU disabled
 15             + as_20 * berr_00;
 16 
 17  fpucs      = fc1 * fc0 * !a19 * !a18 *  a17 * !a16 * jp3;                    ´FPU enabled
 19  avec       = fc1 * fc0 * vpa;
 20 
 21  csp19      = fc1 * fc0 * !a19;
 22 
 23  dram       = !fc0 * !a23 * !a22
 24             + !fc1 * !a23 * !a22;
 25 
 26  rom        = a23 * a22 * a21 *  a20 *  a19 *  a18 * !a17    ´TOS 1.04
 27             + a23 * a22 * a21 *  a20 *  a19 *  a18 * !a16    ´TOS 1.04
 28             + a23 * a22 * a21 * !a20 * !a19;                 ´TOS x.06
 29 
 30  word       = a23 * a22 * a21 *  a20 *  a19 *  a18 * !a17
 31             + a23 * a22 * a21 *  a20 *  a19 *  a18 * !a16
 32             + a23 * a22 * a21 * !a20 * !a19
 33             + !fc0 * !a23 * !a22
 35 
 36  !ciin      = a23 * a22 * a21 *  a20 *  a19 *  a18 * !a17         ´ROM
 37             + a23 * a22 * a21 *  a20 *  a19 *  a18 * !a16         ´ROM
 38             + a23 * a22 * a21 * !a20 * !a19                       ´ROM
 39             + !fc0 * !a23 * !a22                                  ´RAM
 40             + !fc1 * !a23 * !a22;                                 ´RAM
 41 %END