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+CHAPTER 11 
+
+
+HARDWARE REFERENCE 
+
+
+Note: This document is a beta version and may be subject to change. 
+
+
+About this chapter 
+
+
+This chapter presents the details of some of the new hardware present in the Psion Series 3c and Siena 
+machines. 
+
+
+The 15-way SIBO/RS232 connector 
+
+
+Four distinct types of signal are brought in/out via this connector: 
+e RS232 level serial data and handshaking lines 
+e Power in to provide operating power. 
+e A SIBO serial channel at 3V logic levels, to provide an interface to ASIC4/5 based peripherals 
+e 5V power out to power non self-powered peripherals. 
+
+
+Not all of these signals are relevant to both machines; the split being: 
+
+
+The board mounted connector is a Honda type with custom polarisation. The diagram below shows the 
+
+
+pinout of this connector: 
+
+
+11-1 
+
+
+SIENA/SERIES 3C UPGRADE 
+
+
+The pins on the connector have the following functions: 
+Siena Vin at +6Vd.c., 10% — 
+Series 3c 5V Power out, 30mA maximum. 
+RTS (RS232) 
+DTR (RS2372) 
+TXD (RS232) 
+DSR (RS232) 
+DCD (RS232) 
+CTS (RS232) 
+RXD (RS2372) 
+
+
+0 mn nNn nn fF W WN 
+
+
+SDOE - SIBO data direction control. 
+
+
+— 
+o 
+
+
+EXTSTAT - active low SIBO peripheral detect line. 
+
+
+ee 
+ee 
+
+
+EXON - SIBO external turn-on 
+
+
+= 
+N 
+
+
+INT - SIBO peripheral interrupt 
+
+
+— 
+Ww 
+
+
+SD - SIBO serial data 
+
+
+_ 
+Ts 
+
+
+SCK - SIBO data clock 
+
+
+—- 
+—s 
+—> 
+— 
+a 
+— 
+— 
+— 
+— 
+— 
+ 
+ad 
+—_—- 
+
+
+= 
+Nn 
+
+
+GND - Signal and Power ground 
+
+
+GND - Shield frame ground 
+
+
+Key: Out of machine _, 
+Into machine — 
+
+
+Ground — 
+
+
+e The SIBO lines on the Series 3c are not intended to be used for peripherals. They are present 
+on the unit for test purposes only. 
+
+
+e The SIBO lines on the Siena are intended for use with the external SSD drive only, and are 
+filtered to match that peripheral. 
+
+
+e It should be particularly noted that the SIBO lines on pins 9-14 on both machines are at 3V logic 
+levels, as opposed to the 5V levels present on the Series 3a, and are unbuffered; that is, there is no 
+SIBO data direction control imposed on the lines, as is present on the Series 3a external SIBO bus. 
+
+
+e The contacts for pins | and 15 on the socket protrude slightly and make contact before the 
+remaining pins on the connector. 
+
+
+e The only difference between the Series 3c and the Siena pin-outs is the function of pin 1. Applying 
+6V to this pin on the Series 3c will have no detrimental effect. The 5V output on the Series 3c is 
+the normal VCC5 output provided on the SIBO expansion port of an Series 3a, less one Schottky 
+diode drop. The VCCEXT output on Series 3c gets turned on two EPOC ticks after EXTSTAT 
+goes low. 
+
+
+e On the Siena, EXTSTAT directly controls the DNMI line, whilst on the Series 3c, it is polled on 
+PBO6. 
+
+
+e On the Series 3c, the DSR line performs an external wake-up of the machine through an internal 
+connection to the EXON line. This does not happen on the Siena. 
+
+
+11-2 
+
+