Chapter 2 Specification Summary 2-7
2.1.11 Serial Port Interface
Interface Connector DB25P Male, wired for TTY-A and TTY-B,
see A.3.10 on page A-22 for PinOut
Need “Y” splitter cable to use TTY-B
Mode of operation Async @ 460.8 KBps max, Sync @ 384 Kbps max
HandShake signals CTS, RTS, DTR, DSR, fully supported, optional
Interface Voltage RS423 levels: J1804 =2&3,J1806 = 2 & 3
RS232 levels: J1804 =1&2,J1806 = 1 & 2
Slew Rate control Normal speed <100Kbps, 5V/µS J1805 = 2 & 3
High speed >100Kbps, 10V/µS J1805 =1&2
Baud Rate Programmable: 300...460800 asynchronous mode
Parity Bit Programmable: Odd Parity, Even Parity, No Parity
Stop Bits Programmable: 1, 2
Interconnect cable Standard cable up to 30 Meters long
Synchronous Mode and HiSpeed need special attention
Standard IO default At boot time if video or keyboard is absent, OBP and OS
default console communications to TTY-A
OBP default initialize TTY-A: 9600N1; TTY-B: 9600N1
2.1.12 Floppy Disk Drive Interface
Interface connector 34 Pin Dual Row, J1902, see A.3.9 on page A-21
Interface cable 34 pin Flat Ribbon Cable, 13 inches or less
1:1 connection, 1 connector on each end
Device supported 3.5 inch Floppy Drive, 1 Drive only, DS0 or DS1 auto
search. Manual Eject only
Data transfer rate 500Kbps @ 1.44MB High Density ReadWrite operation
250Kbps @ 720KB double Density ReadWrite operation
Media, format supported 1.44MB Unix format only
1.44MB, 720KB DOS format
Boot support Booting from floppy disk is not supported
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