MCD(4)

MCD(4) | Device Drivers Manual | MCD(4)

# NAME

`mcd` —
Mitsumi CD-ROM driver

# SYNOPSIS

`mcd0 at isa? port 0x300 irq 10`
`options MCD_PROMISC`

# DESCRIPTION

The `mcd` driver provides support for Mitsumi CD-ROM controller and drive on the isa(4) bus.

# FILES

/dev/cd[0-9][a-h]
  block mode Mitsumi CD-ROM devices
/dev/rmcd[0-9][a-h]
  raw mode Mitsumi CD-ROM devices

# SEE ALSO

intro(4), isa(4), ne(4), we(4)

# BUGS

The `mcd` hardware is difficult to probe accurately. Historically, the `mcd` probe would accept any return values as indicating that an `mcd` drive was present. Other devices, particularly ne(4) or we(4), would then be incorrectly claimed by the `mcd` driver. The driver now only accepts result codes known to indicate Mitsumi-compatible CD controllers, but may reject some `mcd` hardware which returns other result codes.

`options MCD_PROMISC` enables the original promiscuous probe behaviour. Use with extreme caution.

November 29, 1994 | NetBSD 10.1