P/+cad1

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P/+cad1

This website contains an archive of files for the Acorn Electron, BBC Micro, Acorn Archimedes, Commodore 16 and Commodore 64 computers, which Dominic Ford has rescued from his private collection of floppy disks and cassettes.

Some of these files were originally commercial releases in the 1980s and 1990s, but they are now widely available online. I assume that copyright over them is no longer being asserted. If you own the copyright and would like files to be removed, please contact me.

Tape/disk:	Home » Personal collection » Acorn ADFS disks » Electron_User_Group » EUG_41.ADF
Filename:	P/+cad1
Read OK:	✔
File size:	1979 bytes
Load address:	70206576
Exec address:	61632B2E

Duplicates

There is 1 duplicate copy of this file in the archive:

Personal collection » Acorn ADFS disks » Electron_User_Group » EUG_41.ADF » P/+cad1
Personal collection » Acorn hard disk » zipped_disks » elk06 » eug41/P/+cad1

File contents

Advanced CAD Version 1.0   Written by Dominic Ford 1998

This program is intended to allow the user to enter circuit schematic
diagrams into their computer. This can be useful for a number of reasons,
whether it be to create a computer library of useful circuits, to aid with
the design process of a circuit, or simply to enable you to enter circuit
diagrams into your documents with ease.

Some users may remember the CAD+ program which was published on EUG a
couple of years back. This program is similar in that it performs the same
task, although there are a number of fundamental differences between how
the two operate. The main difference is that this program is
"object-based" whereas CAD+ was not. This means that when you place a
component, it stores the fact that there is a component there, as opposed
to simply placing a picture of the component at the relevant coordinates
in a grid of pixels. This makes editting a lot easier. To move a component
in CAD+ was a nightmare - you had to carefully remove the component from
its original position, place it in its new position, and then redraw any
links to it manually. In Advanced CAD, you can simply click on the
component, drag it across the screen, and you are done. The component will
be removed from its old location, redrawn in the new position, and any
links to it will update automatically.

This is not the only benefit of the object-based system. Storing a pixel
array in the way CAD+ does takes a huge amount of memory, and you cannot
fit that many circuits onto a disc. In this program, the files are a
fraction of the size (a complex circuit might take a tenth the space taken
up by a CAD+ file, a simple circuit more like a fiftieth).

I will now describe step-by-step how to operate Advanced CAD. I am
assuming that you have the program running in front of you - if not, I
strongly recommend that you print this out. It will be fairly heavy going
without seeing the software to understand what I am talking about!

SELECTING AN INPUT DEVICE

When you first start up Advanced CAD, you are asked what input device you
would like to use to control the program. You can use an AMX Mouse, an
analougue joystick, or the keyboard.

If you select keyboard control, you have the option of having joystick
control as well (these two input devices can operate together). Only
answer yes to this if you have a joystick plugged into your computer's
analougue port, otherwise the floating lines of the port may well effect
the input received, making the program unusable.

Once you have selected your input device, the main program loads. You are
then confronted with the CAD Editor screen. At the centre is a
cross-haired pointer which you can control with the selected input
device(s). The controls are as follows:

Keyboard: Z = Left, X = Right, * = Up, ? = Down, RETURN = Click.

Joystick: Fairly obvious, any one of the buttons to click.

Mouse: Left button to click; Middle button to move component; Right button
to add component. The latter two are shortcuts to two of the more commonly
used features. See later for description of these.

A BRIEF TOUR OF ADVANCED CAD

Start up Advanced CAD with a fresh page (ie. how the program is when it
starts up). Click the pointer with the selected input device, and a menu
will appear. This is the menu of basic CAD functions. They are as follows:

File - Bring up a subsiduary menu of filing options (Load, Save, etc.)
Add - Add a component to the circuit.
Cancel - Oops, I didn't mean to bring that menu up - Go away!

You can move up and down the menu with the mouse, joystick (you have to
waggle it), the keys * and ?, or the cursor keys. For the moment, select
"Add" (ie. move down once until Add is highlighted, and click). The menu
will disappear, and a capacitor will appear under the pointer. You have
just added a component to the circuit design.

Now move the pointer left a little way, until it is away from the
capacitor. We now want to add another component to the design - a battery.
First, you must select battery on the list at the top of the screen. Use
the cursor keys to scroll this list down until "Battery" is highlighted.
When you add a component now, it will be a battery, not a capacitor. Do so
- click the pointer with "Battery" selected at the top, and then click on
"Add". A battery will now appear to the left of the capacitor, under the
pointer.

Suppose we now want to link the two components together. First, click on
one of the two components. I will assume here that you have clicked on the
battery for ease of explaining the process, although the process is very
similar if you click on the capacitor first. When you click on the
component, the "Object" menu appears. This menu relates to functions which
you can perform on that component to manipulate it, and has the following
options:

File - Same as on main menu (filing options eg. load/save)
Move - Move a component around the screen.
Delete - Removes a component from the circuit, and deletes any links to it.
Label - Labels the component to make it clear what it does.
Link - Connect to components together.
Cancel - Once again, there is an "Oops" escape route.

We want to link to components together, so select "Link". Next, you are
asked which of the terminals of the battery you wish to connect on a
secondary menu. For the purposes of this example, select the Cathode. You
have now instructed Advanced CAD to make a connection to the cathode of
the battery. Notice that the status box at the top of the screen changes
from "Ready" to "Linking" to show this change of state.

You now have to specify where you want to link this terminal to. Move the
pointer to the component that you want to link to (in this case the
capacitor), and click on it. This time the object menu does not come up,
because you are in the middle of making a link. Instead a menu comes up
asking which terminal you wish to link to. In this example, select "Left".
Once you have done this, you will have completed the link, and the status
will return to "Ready". Notice that a line has been drawn between the
cathode of the battery and the left terminal of the capacitor, as
requested.

It is not clear at the moment what voltage the battery is, or what
capacitance the capacitor should have. For purposes such as these, you may
well want to label components with text. For this you click on the
component you wish to label and bring up the "Object" menu. This time
select "Label".A 4x2 character box will appear for you to enter your label

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00001120  2e 0d 0d 53 75 70 70 6f  73 65 20 77 65 20 6e 6f  |...Suppose we no|
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00001500  20 59 6f 75 0d 68 61 76  65 20 6e 6f 77 20 69 6e  | You.have now in|
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00001560  20 74 68 61 74 20 74 68  65 20 73 74 61 74 75 73  | that the status|
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000015d0  6f 75 20 6e 6f 77 20 68  61 76 65 20 74 6f 20 73  |ou now have to s|
000015e0  70 65 63 69 66 79 20 77  68 65 72 65 20 79 6f 75  |pecify where you|
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00001600  69 73 20 74 65 72 6d 69  6e 61 6c 20 74 6f 2e 20  |is terminal to. |
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000017d0  20 6f 66 20 74 68 65 20  62 61 74 74 65 72 79 20  | of the battery |
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000017f0  6d 69 6e 61 6c 20 6f 66  20 74 68 65 20 63 61 70  |minal of the cap|
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00001810  73 74 65 64 2e 0d 0d 49  74 20 69 73 20 6e 6f 74  |sted...It is not|
00001820  20 63 6c 65 61 72 20 61  74 20 74 68 65 20 6d 6f  | clear at the mo|
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00001860  74 61 6e 63 65 20 74 68  65 20 63 61 70 61 63 69  |tance the capaci|
00001870  74 6f 72 20 73 68 6f 75  6c 64 20 68 61 76 65 2e  |tor should have.|
00001880  20 46 6f 72 20 70 75 72  70 6f 73 65 73 20 73 75  | For purposes su|
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00001900  62 65 6c 20 61 6e 64 20  62 72 69 6e 67 20 75 70  |bel and bring up|
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00001930  6c 65 63 74 20 22 4c 61  62 65 6c 22 2e 41 20 34  |lect "Label".A 4|
00001940  78 32 20 63 68 61 72 61  63 74 65 72 20 62 6f 78  |x2 character box|
00001950  20 77 69 6c 6c 20 61 70  70 65 61 72 20 66 6f 72  | will appear for|
00001960  20 79 6f 75 20 74 6f 20  65 6e 74 65 72 20 79 6f  | you to enter yo|
00001970  75 72 20 6c 61 62 65 6c  0d                       |ur label.|
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