ucsd-psystem-os 1.3
How To Use It

This page explains how to get your shiny new UCSD Pascal system working.

Software

You need to get copies of the following software

ucsd-psystem-xc cross compiler
ucsd-psystem-fs file system tools
ucsd-psystem-vm virtual machine (p-machine)

and then you need to build and install each of them, in that order.

Alternatively, if you are using Ubuntu Linux, you can get pre-built packages from LaunchPad, using a PPA:

sudo add-apt-repository ppa:pmiller-opensource/ppa
sudo apt-get update

and then you simply install them as usual:

sudo apt-get install ucsd-psystem-xc ucsd-psystem-fs ucsd-psystem-vm

Build the UCSD Pascal operating System

See the building web page.

Alternatively, you can download pre-built disk images from this web site:

system.vol The cross compiled system disk image.
utility.vol The cross compiled utilities disk image.

using these commands:

wget /pmiller/ucsd-psystem-os/disk-image/system.vol
wget /pmiller/ucsd-psystem-os/disk-image/utility.vol

Work Area

We are going to use a simple work area for the rest of this demonstration. Change directory into your new work area.

mkdir work
cd work

In this work area, create a file called “hello.text” (note the four-letter file extension) with the following contents:

program hello;
begin
  writeln('Hellow, World!')
end.

Cross Compiler

You can compile the program using the cross compiler:

ucsdpsys_compile hello.text

To execute it, start the virtual machine, and automagically turn the current directory into a disk image:

ucsdpsys -w . -f ../system.vol -N

You will now see the familiar UCSD Pascal prompt:

Command: E(dit, R(un, F(ile, C(omp, L(ink, X(ecute, A(ssem, D(ebug,? [II.0]

Welcome  SYSTEM,  to

U.C.S.D.  Pascal  System  II.0
/pmiller/ucsd-psystem-os/ version 1.3.D001

Current date is  26-Jan-11

we then have to change director into the WORK disk, because it has been build to contain the files in the current directory:

F P WORK: return Q

Now you can run the cross compiled program like so:

X HELLO return

And you will see the display:

Command: E(dit, R(un, F(ile, C(omp, L(ink, X(ecute, A(ssem, D(ebug,? [II.0]
Hello, World!

Native Compiler

Alternatively, use the UCSD native compiler:

C HELLO return
HELLO return

and execute it the same way as you executed the cross compiled version.

Get Me Out Of Here

To quit the system, use H for halt.

You will notice that the current directory has been updated with the changes made to the WORK: volume while it was being used (that's what the “ucsdpsys -w .” option was for).