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P/+cad2

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/+cad2
Read OK: ✔
File size: 19FD bytes
Load address: 70206576
Exec address: 61632B2E
Duplicates

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

File contents
 To move the cursor without typing, use the cursor keys, and to
enter your label, press RETURN. Notice that the label you entered is now
displayed above the component. You may think that 4x2 characters is rather
limiting, and it is. This is intended to be sufficient to give a value
such as 4k7 and a number to each part. It is generally considered good
practice to use an indexing system, anyway (eg. label a resistor as R1,
and then have a footnote seperately, entitled R1, to explain what the
resistor does).

After working on a schematic for a while, you may find that you have
placed a component in the wrong place. There may not be enough space to
add part of the schematic, and in order to rectify the situation you need
to move a few parts out of the way, or you may just want to tidy things up
neatly. This is where the MOVE facility comes in useful. Click on the
component you want to move, to bring up the "Object" menu, and select
"Move". The status will change to "Moving", and the cursor will change to
a flashing square. Move this square to the new location where you want to
put the component, and click again. The part will now have been relocated,
and any links automatically updated.

The delete function will remove any componemt and its links even with a
previously saved file.

As your designs become more complex, you will soon find that the links
start to look untidy. They are drawn as straight lines from the two
terminals at each end, regardless of what might lie between them. This can
cause the links to travel diagonally, which never looks neat, or even
worse to cross another component. A simple solution is to define the path
taken by the link using a series of nodes. Simply place a node at every
corner along the route that you want the link to take, and link each to
the next one along the line.           

INTEGRATED CIRCUITS
One of the components available is the integrated circuit. This is
different from the other components in that various sizes are avaiable.
When you create an integrated cirsuit (ie. click on Add with IC selected
at the top of the screen), you must select the size that you require from
a menu. Most commonly used sizes are offered.

When you click on an IC to bring up the "Object" menu, note that you must
click at the TOP of the chip. This must be within the top three terminals
on each side, and within the main body of the chip (ie. not on the
terminals themselves). If you click elsewhere, it will not register as
being a click on the IC.

When you link to an IC, the sheer number of terminals makes it impossible
to list all of them on a single menu. Therefore you must first select the
range into which the terminal you want falls, and then select the exact
number on a further menu. For example, to link to pin 4, first select
"1-5" and then "4".

FILING YOUR SCHEMATICS
The File menu is available from both the object and main menus. It has the
following items:
New - Wipe your current design from memory and start with a fresh page.
Open - Load a saved design from disc.
Save - Save the current design to disc with the current filename.
SaveAs - Save the current design to disc with a new filename.
Export - Save the design in a format readable by other programs.
Name - Sets the text description given at the top of the screen.
MOS - Give you a * prompt with which to access the operating system.
Exit - Quit the program and return to BASIC.
Cancel - Oops again!

The Open and SaveAs options both ask you for a filename and then load/save
using that filename. The Save facility does not ask you for a filename,
but instead uses the last filename used for this design. For example, if
you load a file using Open and then want to save a modified version, you
can use Save to avoid typing the filename for a second time. This facility
is like that used by most modern PC software.                             

NB: Filenames can be a maximum of 7 characters to ensure DFS
compatibility. They are entered via a 7 character text box, as with the
component labels (use cursor keys to move left/right; Delete won't work)

The Export facility is used if you want to use your schematic in a
document, or program other than Advanced CAD. You should note that the
files made by Open/Save/SaveAs are data files that are of no use to any
program other than Advanced CAD. In contrast, the files made by Export are
graphics files, which are useful to other programs, but useless to
Advanced CAD. For your information, these are mode 4 screendumps.

The MOS facility is useful if you need to communicate with the operating
system for any reason. This is necessary to switch filing systems (eg.
from DFS to ADFS or vice versa), or to switch directories.                                 

NB: DO NOT use this to access to cassette filing system. The tape buffer
is used by this program, and consequently any tape activity will crash the
software.

At the top of the screen there is a box which initially contains
"<Untitled>". This box is intended as a 15 character description of what
the current schematic is. You can edit the text that it contains using
"Name" on the File menu.

MEMORY LIMIT
The memory limit in Advanced CAD is fairly generous:
Maximum 127 components per schematic (includes nodes).
Maximum 255 links between components.

EXAMPLE FILES
Two example files are supplied on this EUG disc - they can be accessed
using "Open" on the file menu. They are as follows:
Amp - An OpAmp set up as a non-inverting amplifier.
PLL - A phase locked loop set up to act as a 410x frequency multiplier.

FUTURE DEVELOPMENTS
I have a number of ideas for improvements which I could make to Advamced
CAD, and it is my intention to release a second version in a few months
time. Features may include automatically making links look neat (avoid
cutting components), and a larger list of components. If I can find the
memory (and the time to do it!) I may even consider some simple PCB layout
facilities. The main limiting factor in this version was the memory
available, and so I will have to convert the entire program into machine
code to make these ideas possible.
One feature which is clearly lacking is an "Undo Link" function. Once you
have linked two components, the only way to undo your link is to delete
one of the components and then make a new one in its place. This can be a
bit tedious with ICs, and so I recommend frequent saving. The reason for
this ommision is simply lack of memory, and so this is my first priority
in any future version.
If you have any comments/ideas, please do pass them onto me, either via
EUG or if you have the internet, to dominic.ford@cwcom.net
Dominic Ford

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00000050  2c 20 70 72 65 73 73 20  52 45 54 55 52 4e 2e 20  |, press RETURN. |
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000018d0  77 69 74 68 20 49 43 73  2c 20 61 6e 64 20 73 6f  |with ICs, and so|
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00001910  73 20 6f 6d 6d 69 73 69  6f 6e 20 69 73 20 73 69  |s ommision is si|
00001920  6d 70 6c 79 20 6c 61 63  6b 20 6f 66 20 6d 65 6d  |mply lack of mem|
00001930  6f 72 79 2c 20 61 6e 64  20 73 6f 20 74 68 69 73  |ory, and so this|
00001940  20 69 73 20 6d 79 20 66  69 72 73 74 20 70 72 69  | is my first pri|
00001950  6f 72 69 74 79 0d 69 6e  20 61 6e 79 20 66 75 74  |ority.in any fut|
00001960  75 72 65 20 76 65 72 73  69 6f 6e 2e 0d 49 66 20  |ure version..If |
00001970  79 6f 75 20 68 61 76 65  20 61 6e 79 20 63 6f 6d  |you have any com|
00001980  6d 65 6e 74 73 2f 69 64  65 61 73 2c 20 70 6c 65  |ments/ideas, ple|
00001990  61 73 65 20 64 6f 20 70  61 73 73 20 74 68 65 6d  |ase do pass them|
000019a0  20 6f 6e 74 6f 20 6d 65  2c 20 65 69 74 68 65 72  | onto me, either|
000019b0  20 76 69 61 0d 45 55 47  20 6f 72 20 69 66 20 79  | via.EUG or if y|
000019c0  6f 75 20 68 61 76 65 20  74 68 65 20 69 6e 74 65  |ou have the inte|
000019d0  72 6e 65 74 2c 20 74 6f  20 64 6f 6d 69 6e 69 63  |rnet, to dominic|
000019e0  2e 66 6f 72 64 40 63 77  63 6f 6d 2e 6e 65 74 0d  |.ford@cwcom.net.|
000019f0  44 6f 6d 69 6e 69 63 20  46 6f 72 64 0d           |Dominic Ford.|
000019fd
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