IBM 4840-563 User Manual

Interrupt Status Register B (Read Only) Offset 41h
Bit 3 = Status of UART 3 Interrupt Status (0: No Interrupt, 1: Interrupt Asserted)
Bit 2 = Status of UART 2 Interrupt Status (0: No Interrupt, 1: Interrupt Asserted)
Bit 1 = Status of UART 1 Interrupt Status (0: No Interrupt, 1: Interrupt Asserted)
Bit 0 = Status of UART 0 Interrupt Status (0: No Interrupt, 1: Interrupt Asserted)
SurePOS 500 Model XX3 Technical Reference, v 1.3 Page 47 of
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IBM 4840-563 Specifications

General

Brand	IBM
Model	4840-563
Category	Cash Register
Language	English