.TH LDPCS 8 VAX-11/750
.CT 1 sa_auto
.SH NAME
ldpcs \- load comet microcode
.SH SYNOPSIS
.B /etc/ldpcs
[
.B -f
]
[
.B -v
]
.I pcsfile
.SH DESCRIPTION
.I Ldpcs
loads microcode
from
.I pcsfile
into the VAX-11/750 patchable control store.
Normally,
the hardware ID register is checked
to see that the system is an 11/750
and that its base microcode revision level
is appropriately high;
the
.B -f
option
removes the checks.
The
.B -v
option causes the microcode version number
to be printed after loading.
.PP
.I Ldpcs
is usually called from
.IR rc (8)
to load the most recent
.SM DEC
microcode patches from
.FR /etc/pcs750.bin .
.PP
The patch file consists of
1024 bytes of patch bits,
followed by 10240 bytes of actual patches.
Each patch bit represents a 20-bit microcode word;
the patches themselves are 20-bit words
packed together.
The format is the same as that distributed by DEC.
.SH FILES
.F /dev/mem
.br
.F /dev/mtpr
.SH BUGS
Calling
.I ldpcs
is a good idea,
but it is not mandatory;
the system will run without the patches.