started implementation of a Motorola 68230 PI/T (Parallell Interface / Timer) device

src/emu/machine/68230pit.c

@@ -0,0 +1,44 @@
+// license:BSD-3-Clause
+// copyright-holders:Joakim Larsson Edström
+/**********************************************************************
+
+    Motorola MC68230 PI/T Parallell Interface and Timer
+
+**********************************************************************/
+
+/*
+  Registers  
+-----------------------------------------------------------------------
+  Offset        Reset R/W 
+  RS1-RS5 Name  Value Reset Description
+-----------------------------------------------------------------------
+  0x00 RW PGCR         No   Port General Control register
+  0x01 RW PSRR         No   Port Service Request register
+  0x02 RW PADDR        No   Port A Data Direction register
+  0x03 RW PBDDR        No   Port B Data Direction register
+  0x04 RW PCDDR        No   Port C Data Direction register
+  0x05 RW PIVR         No   Port Interrupt vector register
+  0x06 RW PACR         No   Port A Control register
+  0x07 RW PBCR         No   Port B Control register
+  0x08 RW PADR         May  Port A Data register
+  0x09 RW PBDR         May  Port B Data register
+  0x0a RO PAAR         No   Port A Alternate register
+  0x0b RO PBAR         No   Port B Alternate register
+  0x0c RW PCDR         No   Port C Data register
+  0x0d RW PSR          May  Port Status register
+  0x0e n/a
+  0x0f n/a
+  0x10 RW TCR          No   Timer Control Register
+  0x11 RW TIVR         No   Timer Interrupt Vector Register
+  0x12 n/a
+  0x13 RW CPRH         No   Counter Preload Register High
+  0x14 RW CPRM         No   Counter Preload Register Middle
+  0x15 RW CPRL         No   Counter Preload Register Low
+  0x17 RO CNTRH        No   Counter Register High
+  0x18 RO CNTRM        No   Counter Register Middle
+  0x19 RO CNTRL        No   Counter Register Low
+  0x1A RW TSR          May  Timer Status Register
+
+*/
+
+

src/emu/machine/68230pit.h

@@ -0,0 +1,34 @@
+// license:BSD-3-Clause
+// copyright-holders:Joakim Larsson Edström
+/**********************************************************************
+
+    Motorola MC68230 PI/T Parallell Interface and Timer
+
+**********************************************************************/
+
+#define PGCR        0x00 /* Port General Control register */
+#define PSRR        0x01 /*   Port Service Request register */
+#define PADDR       0x02 /*   Port A Data Direction register */
+#define PBDDR       0x03 /*   Port B Data Direction register */
+#define PCDDR       0x04 /*   Port C Data Direction register */
+#define PIVR        0x05 /*   Port Interrupt vector register */
+#define PACR        0x06 /*   Port A Control register */
+#define PBCR        0x07 /*   Port B Control register */
+#define PADR        0x08 /*  Port A Data register */
+#define PBDR        0x09 /*  Port B Data register */
+#define PAAR        0x0a /*   Port A Alternate register */
+#define PBAR        0x0b /*   Port B Alternate register */
+#define PCDR        0x0c /*   Port C Data register */
+#define PSR         0x0d /*  Port Status register */
+#define TCR         0x10 /*   Timer Control Register */
+#define TIVR        0x11 /*   Timer Interrupt Vector Register */
+#define CPRH        0x13 /*   Counter Preload Register High */
+#define CPRM        0x14 /*   Counter Preload Register Middle */
+#define CPRL        0x15 /*   Counter Preload Register Low */
+#define CNTRH       0x17 /*   Counter Register High */
+#define CNTRM       0x18 /*   Counter Register Middle */
+#define CNTRL       0x19 /*   Counter Register Low */
+#define TSR         0x1A /*  Timer Status Register */
+
+
+