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RH(4)			    BSD Programmer's Manual			 RH(4)

NAME
     rh - SDL Communications RISCom/H2 dual high-speed synchronous interface

SYNOPSIS
     rh0 at isa? port 0x240 drq 6

DESCRIPTION
     The rh interface provides two point-to-point bit-synchronous serial con-
     nections with speeds up to 4 Mb/s using HDLC frame format.	 It uses a
     switch-selectable block of 8 I/O ports in the range 0x200 through 0x3f0.
     The block must be aligned on a 16 port boundary.  The jumper-selectable
     interrupt level is detected at autoconfiguration time or alternatively
     can be specified in the system configuration file.	 Supported IRQs are:
     3, 4, 5, 6, 10, 11, 12 and 15.  No I/O memory is used.  A 16-bit DMA
     channel should be specified in the kernel configuration file and selected
     by on-board jumpers; supported DRQs are 5, 6 and 7.  The RISCom/H2 board
     should be installed in a 16-bit slot.

     Supported synchronous serial encapsulation protocols are described in
     p2p(4).

     The interface flag IFF_LINK0 turns on the internal clock, settable via
     the link0 option of ifconfig(8).

DIAGNOSTICS
     The following diagnostics may be printed during autoconfiguration:

     rh%d: illegal base address %x
     Invalid port specification in kernel config file.

     rh%d: illegal drq %d
     Invalid DRQ specification in kernel config file.

     rh%d: illegal IRQ %d
     Invalid IRQ specification in kernel config file.

     rh%d: no memory for the channel 1 data
     The attach routine cannot allocate memory for the channel 1.  Should nev-
     er happen.

SEE ALSO
     intro(4),	inet(4),  p2p(4),  ifconfig(8)

BUGS
     The RISCom/H2 board uses cascade DMA mode which is known not to work on
     some motherboards.	 Make sure your motherboard works correctly with the
     RISCom/H2 using the manufacturer-supplied test program.

     The maximal transmission speed may vary depending on the processor speed
     and ISA bus timing parameters.

BSDI BSD/OS			 March 1, 1993				     1

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