Add ramdisk support for pmax; untested but compiles

src/etc/etc.pmax/MAKEDEV

@@ -1,6 +1,6 @@
 #!/bin/sh -
 #
-#	$OpenBSD: MAKEDEV,v 1.26 1998/10/15 21:24:53 art Exp $
+#	$OpenBSD: MAKEDEV,v 1.27 1998/11/09 05:39:59 millert Exp $
 #	@(#)MAKEDEV	8.1 (Berkeley) 6/9/93
 #
 
@@ -119,6 +119,11 @@ all)
 	sh $this fb0 fb1 fb2
        ;;
 
+raminst)
+	sh $this std
+	sh $this rz0 rz1 rz2 rz3 rz4 tz0 tz1 rd0 pty0
+	sh $this fb0 fb1 fb2
+
 std)
 	mknod console		c 0 0
 	mknod drum		c 1 0	; chmod 640 drum ; chown root.kmem drum
@@ -291,6 +296,17 @@ vnd*)
 	umask 77
 	;;
 
+rd*)
+	umask 2 ; unit=`expr $i : '.*d\(.*\)'`
+	mknod rd${unit}a b 25 `expr $unit '*' 16 + 0`
+	mknod rd${unit}c b 25 `expr $unit '*' 16 + 2`
+	mknod rrd${unit}a c 92 `expr $unit '*' 16 + 0`
+	mknod rrd${unit}c c 92 `expr $unit '*' 16 + 2`
+	chown root.operator rd${unit}[ac] rrd${unit}[ac]
+	chmod 640 rd${unit}[ac] rrd${unit}[ac]
+	umask 77
+	;;
+
 dc*)
 	unit=`expr $i : 'dc\(.*\)'`
 	case $unit in

src/etc/etc.pmax/disktab

@@ -37,6 +37,11 @@
 # four times `a' while `c' is always the entire disk. The
 # sum of `d', `e', and `f' is equal to `g' which is everything else.
 
+rdroot|ramdiskroot|RAM-disk root FS image:\
+	:ty=simulated:se#512:nc#24:nt#2:ns#128:\
+	:ta=4.2BSD:oa#0:pa#6144:fa#512:ba#4096\
+	:ob#0:pb#0:oc#0:pc#6144:
+
 simpleroot:\
 	:ty=winchester:\
 	:dt=SCSI:\