VDC_DATA := $D601
; ---------------------------------------------------------------------------
-; I/O: CIAs
+; I/O: Complex Interface Adapters
CIA1 := $DC00
-CIA1_PRA := $DC00
-CIA1_PRB := $DC01
-CIA1_DDRA := $DC02
-CIA1_DDRB := $DC03
-CIA1_TOD10 := $DC08
-CIA1_TODSEC := $DC09
-CIA1_TODMIN := $DC0A
-CIA1_TODHR := $DC0B
-CIA1_ICR := $DC0D
-CIA1_CRA := $DC0E
-CIA1_CRB := $DC0F
+CIA1_PRA := $DC00 ; Port A
+CIA1_PRB := $DC01 ; Port B
+CIA1_DDRA := $DC02 ; Data direction register for port A
+CIA1_DDRB := $DC03 ; Data direction register for port B
+CIA1_TA := $DC04 ; 16-bit timer A
+CIA1_TB := $DC06 ; 16-bit timer B
+CIA1_TOD10 := $DC08 ; Time-of-day tenths of a second
+CIA1_TODSEC := $DC09 ; Time-of-day seconds
+CIA1_TODMIN := $DC0A ; Time-of-day minutes
+CIA1_TODHR := $DC0B ; Time-of-day hours
+CIA1_SDR := $DC0C ; Serial data register
+CIA1_ICR := $DC0D ; Interrupt control register
+CIA1_CRA := $DC0E ; Control register for timer A
+CIA1_CRB := $DC0F ; Control register for timer B
CIA2 := $DD00
CIA2_PRA := $DD00
CIA2_PRB := $DD01
CIA2_DDRA := $DD02
CIA2_DDRB := $DD03
+CIA2_TA := $DD04
+CIA2_TB := $DD06
CIA2_TOD10 := $DD08
CIA2_TODSEC := $DD09
CIA2_TODMIN := $DD0A
CIA2_TODHR := $DD0B
+CIA2_SDR := $DD0C
CIA2_ICR := $DD0D
CIA2_CRA := $DD0E
CIA2_CRB := $DD0F
VDC_DATA := $D601
; ---------------------------------------------------------------------------
-; I/O: CIAs
+; I/O: Complex Interface Adapters
CIA1 := $DC00
-CIA1_PRA := $DC00
-CIA1_PRB := $DC01
-CIA1_DDRA := $DC02
-CIA1_DDRB := $DC03
-CIA1_TOD10 := $DC08
-CIA1_TODSEC := $DC09
-CIA1_TODMIN := $DC0A
-CIA1_TODHR := $DC0B
-CIA1_ICR := $DC0D
-CIA1_CRA := $DC0E
-CIA1_CRB := $DC0F
+CIA1_PRA := $DC00 ; Port A
+CIA1_PRB := $DC01 ; Port B
+CIA1_DDRA := $DC02 ; Data direction register for port A
+CIA1_DDRB := $DC03 ; Data direction register for port B
+CIA1_TA := $DC04 ; 16-bit timer A
+CIA1_TB := $DC06 ; 16-bit timer B
+CIA1_TOD10 := $DC08 ; Time-of-day tenths of a second
+CIA1_TODSEC := $DC09 ; Time-of-day seconds
+CIA1_TODMIN := $DC0A ; Time-of-day minutes
+CIA1_TODHR := $DC0B ; Time-of-day hours
+CIA1_SDR := $DC0C ; Serial data register
+CIA1_ICR := $DC0D ; Interrupt control register
+CIA1_CRA := $DC0E ; Control register for timer A
+CIA1_CRB := $DC0F ; Control register for timer B
CIA2 := $DD00
CIA2_PRA := $DD00
CIA2_PRB := $DD01
CIA2_DDRA := $DD02
CIA2_DDRB := $DD03
+CIA2_TA := $DD04
+CIA2_TB := $DD06
CIA2_TOD10 := $DD08
CIA2_TODSEC := $DD09
CIA2_TODMIN := $DD0A
CIA2_TODHR := $DD0B
+CIA2_SDR := $DD0C
CIA2_ICR := $DD0D
CIA2_CRA := $DD0E
CIA2_CRB := $DD0F