||r/w||ADR||HEXADR||NAME||Description||Shadow||OS
|write|53774|$D20E|IRQEN|[POKMSK]|Interrupt Request Enable|all
|read|53774|$D20E|IRQST|[POKMSK]|Interrupt Request Status|all

!!Write
||Bit||Function
|0|d
|1|d
|2|d
|3|d
|4|d
|5|d
|6|d
|7|d

Bit set to "0" (zero) turns interrupt off (disable)
Bit set to "1" (one) turns interrupt on (enable)

!!Read
||Bit||Value||Function||Vector
|0|$01 1|Timer 1 (counted down to zero)|[VTIMR1] (528; $0210)
|1|$02 2|Timer 2 (counted down to zero)|[VTIMR2] (530; $0212)
|2|$04 4|Timer 4 (counted down to zero)|[VTIMR4] (532; $0214 - OS "B" and later ROMs only)
|3|$08 8|Serial output transmission down|[VSEROC] (526; $020E)
|4|$10 16|Serial Output data needed|[VSEROR] (524; $020C)
|5|$20 32|Serial input data ready|[VESRIN] (522; $020A)
|6|$40 64|Other key pressed|[VKEYBD] (520; $0208)
|7|$80 128|Break key pressed|[BRKKY] (566; $0236 - OS "B" and later ROMs only) 

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see also: [Keyboard topics|Keyboard_topics]