Port

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The VES has four usable 8-bit data ports in the console, port 0 and 1 that are in the 3850 CPU and port 4 and 5 on one of the 3851 Program Storage Units. These I/O:s are hooked to specific functions as shown in the table below.

Port 0

0 TIME console button
1 MODE console button
2 HOLD console button
3 START console button
4 - not connected -
5 ARM (sound/graphics)
6 Enable in-signal from controllers
7 - not connected -

Port 1

0
1
2
3
4
5
6
7

Port 4

Port 4 has double duties and serve left controller as well as horizontal video position.

0 Left controller right
1 Left controller left
2 Left controller down
3 Left controller forward
4 Left controller counter clockwise
5 Left controller clockwise
6 Left controller pull
7 Left controller push

Also:

0 Video Select
1 Video Horizontal A
2 Video Horizontal B
3 Video Horizontal C
4 Video Horizontal D
5 Video Horizontal E
6 Video Horizontal F
7


Port 5

0 Video Vertical A
1 Video Vertical B
2 Video Vertical C
3 Video Vertical D
4 Video Vertical E
5 Video Vertical F
6 Tone AN (beep sound)
7 Tone BN (beep sound)