IBM 4840-563 System Reference - Page 67
Programming, Interface Description, Track data switch, Track MSR data
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3-Track MSR data Incoming data from the 3-track MSR has the following format: JUCC MSR data Incoming data from the JUCC MSR has the following format: Programming Interface Description Track data switch On the 3 track MSR, the track data interface is chosen with a slide switch located on the MSR such that it is only accessible when the MSR is not attached. One setting of the switch will cause the MSR to send track data with a serial interface at 19200 baud with 8 bits, no parity and 1 stop bit. The other setting of the slide switch will cause the MSR to send track data via the PS/2 keyboard interface. A pin button located so that it is not accessible with the MSR is fully installed is used to reset the MSR's configuration to the factory default state. SurePOS 500 Model XX3 Technical Reference, v 1.3 81 Page 67 of
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