IBM System/23 Datamaster: Difference between revisions

@@ Line 156: / Line 156: @@
 {| class="wikitable"
-! Ports !! Device
+! Ports !! Device !! Function
 |-
-| 00h-0Fh || DMA
+| 00h-0Fh || 8257 || DMA
 |-
-| 20h-23h || Page registers
+| 20h-23h || 74LS670 || Page registers
 |-
-| 24h-27h || PIT
+| 24h-27h || 8253 || PIT
 |-
-| 28h-2Bh || PIC
+| 28h-2Bh || 8259 || PIC
 |-
-| 2Ch-2Fh || 8255#3
+| 2Ch-2Fh || 8255#1 || Unknown
 |-
-| 40h-43h || Service port
+| 40h || 8255#2 || Unknown
 |-
-| 44h-47h || CRTC
+| 41h || 8255#2 || Service port
 |-
-| 48h-4Bh || USART
+| 42h-43h || 8255#2 || Unknown
 |-
-| 4Ch || Data bus test register
+| 44h-47h || 8275 || CRTC
 |-
-| 4Dh-4Fh || Keyboard port
+| 48h-4Bh || 8251 || USART
+|-
+| 4Ch || 8255#3 || Data bus test register
+|-
+| 4Dh-4Fh || 8255#3 || Keyboard port
 |}