PMAC Product Guide E44-E47: Serial Baud Rate Selection The configuration of these jumpers and the particular CPU option ordered (usually written on chip U13 on PMAC) determine the baud rate at which PMAC will communicate through its J4 or J4A serial port. E49: Serial Communications Parity Control Default Configuration E49 ON This jumper is related to an advanced feature and should not be changed from default. E66-E71, E91-E92: ISA Bus Base Address Control Jumpers E91, E92, E66, E67, E68, E69, E70, and E71 on the PMAC-Lite determine the base address of the card in the I/O space of the host PC’s expansion bus.
Together, they form a binary number that specifies the 16 consecutive addresses on the bus where the card can be found. The jumpers form the base address in the following fashion:
16 PMAC Jumper Configuration Default Configuration E44 E45 E46 E47 OFF ON ON OFF Baud Rate Control E Points Baud Rate E44 E45 E46 E47 20 MHz Flash CPU (Opt 4A) Battery CPU, 40 MHz Flash CPU (Opt 5A) 60 MHz Flash CPU (Opt 5B) 80 MHz Flash CPU (Opt 5C) ON ON ON ON Disabled Disabled Disabled Disabled OFF ON ON ON 300 600 900 1200 ON OFF ON ON 400* 800* 1200 1600* OFF OFF ON ON 600 1200 1800 2400 ON ON OFF ON 800* 1600* 2400 3200* OFF ON OFF ON 1200 2400 3600 4800 ON OFF OFF ON 1600* 3200* 4800 6400* OFF OFF OFF ON 2400 4800 7200 9600 ON ON ON OFF 3200* 6400* 9600 12800* OFF ON ON OFF 4800 9600 14400 19200 ON OFF ON OFF 6400* 12800* 19200 25600* OFF OFF ON OFF 9600 19200 28800 38400 ON ON OFF OFF 12800* 25600* 38400 51200* OFF ON OFF OFF 19200 38400 57600 76800 ON OFF OFF OFF 25600* 51200* 76800 102400* OFF OFF OFF OFF 38400 76800 115200 153600 *Non-standard baud rate Default Configuration E66 E67 E68 E69 E70 E71 E91 E92 OFF ON ON ON ON OFF ON ON