Coco3-GAL-WinCUPL.PLD

Name 26-3024 M.P.I. Upgrade ;
PartNo GCC-3024.01 ;
Date 6/1/2010 ;
Revision 01 ;
Designer J&R ;
Company GIMEchip.com ;
Assembly 26-3024 M.P.I. Upgrade PAL for CoCo 3 ;
Location U6 ;
Device g16v8 ;
/* ***************** INPUT PINS *****************/
PIN 01 = !FFXX; /* LOW For Any Address Between $FF00-$FFFF */
PIN [2..9] = [A7..0]; /* CPU A7 - A0 */
PIN 11 = RW; /* READ = 1, WRITE = 0 */
PIN 12 = E; /* E-Clock */
PIN 13 = Q; /* Q-Clock */
PIN 18 = !CTS; /* Cartridge Select Signal. */
PIN 19 = !SLENB; /* Input To Disable Device Selection. */
/* ***************** OUTPUT PINS *****************/
PIN 14 = !DBEN; /* Enables The Multi-Pak Interface Data Buffer */
PIN 15 = !IOR; /* Read the Slot Select Latch. */
PIN 16 = !IOW; /* Write the Slot Select Latch */
/* ***************** LOGIC EQUATIONS & VARIABLE DEFINITIONS *****************/
FIELD ADDRESS = [A7..0]; /* */
LATCH = ADDRESS:[7F]; /* Slot Select Latch@$FF7F */
IOR = LATCH & FFXX & E & RW; /* Active on $FF7F and E=1 and RW=1 */
IOW = LATCH & FFXX & E & !RW & !Q; /* Active on $FF7F and E=1 and RW=0 and Q=0 */
DBEN = (ADDRESS:[40..7F] & FFXX) # SLENB # CTS;/* Active $FF40-$FF7F or SLENB or CTS */
/* *****************/