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Original-From: Info-Atari16 Digest 
Subject:      Info-Atari16 Digest V87 #276
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Info-Atari16 Digest   Tuesday, July 14, 1987   Volume 87 : Issue 276

This weeks Editor: Bill Westfield

Today's Topics:

                  FCC news release on PDN surcharge
                        Re: Lost disk sectors
                            Motherboards?
                        SIGNUM internal format
                       ST Circuit Analysis Prg

----------------------------------------------------------------------

Posted-From: The MITRE Corp., Bedford, MA
To: info-atari16@score.stanford.edu
Subject: FCC news release on PDN surcharge
Date: Thu, 09 Jul 87 21:18:51 EDT
From: jhs@mitre-bedford.ARPA

From: David Roode 
----
Following is the FCC access charges news release of June 10, 1987.
(This is not the official text of the Commission's Notice of Proposed
Rulemaking (NPRM).)

 FCC PROPOSES ELIMINATION OF INTERSTATE ACCESS CHARGES EXEMPTION
                FOR ENHANCED SERVICE PROVIDERS

   The Commission has proposed elimination of the exemption from
interstate access charges currently allowed enhanced service
providers, effective January 1, 1988.  Charges for intrastate service
would not be affected.
   Enhanced services add value to, or enhance the use of, basic
transmission service.  Examples of enhanced services, which the
Commission defined in its Computer II and Computer III procedings,
include computer-based applications such as protocol processing,
information retrieval systems and voice or message services.
   In its access charge proceeding, the Commission provided for
exemptions for a number of groups.  These exemptions have gradually
been eliminated.
   In the pre-access environment, enhanced service providers and WATS
resellers were paying local business exchange service rates for their
interstate access, rather than the higher charges that other common
carriers (OCCs) were paying and the even higher amounts assessed to
MTS and WATS through the divisions of revenues and settlements
processes.  The Commission decided that the immediate imposition of
interstate access charges on enhanced service providers and resellers
could affect their ability to provide service during the time they
were adjusting to the new access charge rules.  Consequently, the
Commission granted enhanced service providers, as well as resellers, a
temporary exemption from payment of interstate access charges.
   In proposing to eliminate this exemption, the Commission said it
was concerned that the charges currently paid by enhanced service
providers did not contribute sufficiently to the cost of the exchange
access facilities they use in offering services to the public.
Concerns about rate shock might justify a temporary, but not a
permanent, exemption from access charges.  Enhanced service providers
have had ample notice of the Commission's ultimate intent to apply
interstate access charges and ample opportunity to adjust their
planning accordingly.
   Moreover, it said, the potential financial impact on enhanced
service providers of eliminating their exemption is substantially
smaller than it was at the time the exemption was granted.  In
particular, the Commission noted that the common carrier line charge
has decreased dramatically with the introduction of subscriber line
charges.  END


- ------- End of Forwarded Message

------- End of Forwarded Message

------------------------------

Date: 9 Jul 87 20:46:03 GMT
From: tektronix!sequent!mntgfx!dclemans@ucbvax.Berkeley.EDU  (Dave Clemans)
Subject: Re: Lost disk sectors
To: info-atari16@score.stanford.edu

From what I've understood, the two missing sectors in GEMDOS disk partitions ar
a result of a mistake made by whoever at Digital Research implemented GEMDOS.

MS-DOS reserves the first two entries in the FAT, as does GEMDOS.  However,
 MS-DOS
adjusts the FAT table size to account for the reserved entries (i.e. increases
 its
size by two).  GEMDOS doesn't do this; thus the last two clusters get lost.

dgc

------------------------------

Date: 10 Jul 87 01:24:29 GMT
From: tektronix!tekcrl!tekfdi!mhorne@ucbvax.Berkeley.EDU  (Michael T. Horne)
Subject: Motherboards?
To: info-atari16@score.stanford.edu

[]

I'm looking for sources of motherboards for the Mac, the ST, and the Amiga.
I don't know if they are even available, so could someone in the know please
inform me of the availability of the boards?  I think I heard something
about Mac motherboards being available, but I need more information.  Any
info about prices, vendors, and availability would be greatly appreciated.

Mike

--
Michael Horne - KA7AXD      |  DOMAIN: mhorne@honda.fdi.tek.com
FDI group, Tektronix, Inc   |  UUCP: tektronix!tekfdi!honda!mhorne
Day: (503) 627-1666         |  INTERNET: mhorne%honda.fdi.tek.com@relay.cs.net

------------------------------

Date: 2 Jul 87 16:03:05 GMT
From: eagle!icdoc!dcw@ucbvax.Berkeley.EDU  (Duncan C White)
Subject: SIGNUM internal format
To: info-atari16@score.stanford.edu

Hello everyone,

    A friend of mine has a small problem: he has entered a 40
    page paper about Theoretical Physics [chock full of silly
    little Greek symbols, mathematical equations and such like]
    into SIGNUM (a document processing system on the Atari ST).

    Now, he has decided that Signum is not good enough for his
    purposes, and prefers TeX [on a VMS VAX]

    So, we want to extract as much of the data as possible out
    of the Signum files [ideally, text, greek and equations, but
    just having the ascii text would be better than nothing]

    The manual doesn't appear to say anything about the internal
    format that Signum uses.  It contains a section on importing
    plain ASCII files into Signum, but no corresponding section
    on exporting. [yes, I know that's more difficult]

    We have started by looking at a hex dump of a fairly short
    section of the paper.  After some initial blurb, which appears
    to include the names of the fonts used in the text, the rest
    of the text appears to consist of a sequence of character
    pairs : the first is some form of 'tag' character, and
    invariably has the top bit set, and the second is the actual
    character.

    The major problem is that spaces are not stored in the document:
    it seems that a word start is signalled by a tag value of one
    of several values: A0, A4 and 9A are three such values.
    However, we have not managed to deduce when it uses which
    particular values, or indeed what the full set of 'word start'
    tags are.
    Worse, there are some tag values [98, for example] which do
    not appear to be UNIVERSALLY 'word start' tags: some words
    are marked by this tag, but the same tag value is also present
    in the middle of other words!
    Also, for some reason, y and z are swapped, and the word 'We'
    gets rendered as "W e".

    We have had no real success with the equations or greek letters:
    however, we can probably mark their positions [or at least, the
    positions of total garbage]

    What we already have is much better than nothing, but we would
    appreciate any hints, pointers, suggestions, full-blown 'C' or
    PASCAL source code ( well, it's worth a try :-) on the format
    Signum uses.   If we get enough information, we could write
    a conversion utility which will convert Signum files into ASCII
    files, probably with special 'dot commands' to represent the
    equations and greek squiggles.  [ like troff/eqn on Unix ]

    The ultimate tool for this job would obviously be a Signum -> TeX
    translator.  Unfortunately, I do not know very much about TeX
    either, so I couldn't really write such a beast. [anyone else
    want a fun project, and know TeX and Signum ???]

    Please mail any suggestions etc etc to me, and I'll summarize what
    I get...

        ecnavda ni xnahT

            nacnuD

(well, everyone says I'm backward :-)

-----------------------------------------------------------------------------
JANET address : dcw@uk.ac.ic.doc| Snail Mail :  Duncan White,
--------------------------------|               Dept of Computing,
  This space intentionally      |               Imperial College,
  left blank......              |               180 Queen's Gate,
  (paradoxical excerpt from     |               South Kensington,
  IBM manuals)                  |               London SW7
----------------------------------------------------------------------------
Tel: UK 01-589-5111 x 4982/4991

------------------------------

Date: Fri, 10 Jul 87 07:30:38 EST
From: maccarle@ed.ecn.purdue.edu (Carl A Maccarley)
To: info-atari16@score.stanford.edu
Subject: ST Circuit Analysis Prg

I am posting this for Peter.  It is a very well written circuit analysis
program, for small signal analysis of lumped circuits.
Includes complete docs.  I've only tested it on mono, but no mention
of any problems with color.
Four uuencoded files will follow this, three at about 32K and one at about 5K.
Prelim info below should cover everything.
- carl    maccarle@ed.ecn.purdue.edu
______________________________________________________________________________

From: "Peter_VerBruggen.HENR801c"@Xerox.COM

The Circuit Analysis Program (CAP) is an analysis tool for determine the
steady-state AC behaviour of electrical/electronic networks.
The network may contain resistors, capacitors, inductors, controlled cur-
rent sources (e.g. transistors, op-amps etc.) and independent current sour-
ources.

CAP was originally issued for the HP85, but has been adapted for the ST
after a lot of re-writing and testing.
Although CAP does not have the capabilies of programs like e.g. SPICE, in
small AC circuit analysis however, the output results are satisfactory and
in most cases accurate enough to predict the actual circuit behaviour.

Output can be any node voltage, branch voltage, branch current, branch
power or ratio's thereof.
Tabulated or plotted outputs are available with linear or logarithmic fre-
quency sweeps.

CAP is primary intended for electrical engineers or those who are familiar
with electrical networks and basic electrical/electronic theory.

All files belonging to CAP must be located in folder CAP, including folder
GUIDE, which contains several help-files.
Files with the extension CIR are circuit examples, which can be loaded and
analysed after frequencies and output quantities are selected and calcula-
tions have been performed.

NOTE: Hardcopy of full screen can be made by ALTERNATE+HELP.

We will offer CAP as a public domain program for non-commercial usage and
therefore assume no responsibility and shall have no liability, consequen-
tial or otherwise of any kind arising from the use of this program.




Ger Gruiters

Rank Xerox   Venray The Netherlands

----------------------------  Structure of files ---------------
G6.DOC         851             \CAP\GUIDE
G4.DOC        1114             \CAP\GUIDE
G5.DOC         878             \CAP\GUIDE
G3.DOC        1042             \CAP\GUIDE
G1.DOC         387             \CAP\GUIDE
G7.DOC         998             \CAP\GUIDE
G8.DOC         768             \CAP\GUIDE
G10.DOC        757             \CAP\GUIDE
G9.DOC         643             \CAP\GUIDE
G2.DOC        1035             \CAP\GUIDE
BJT.PIC      32000             \CAP
CAP.PIC      32000             \CAP
CAP.PRG      40980             \CAP
CAPNXT.RSC   20904             \CAP
EX1.CIR        584             \CAP
EX2.CIR        584             \CAP
EX3.CIR        584             \CAP
OPAMP.PIC    32000             \CAP
PARAM.PIC    32000             \CAP
README.DOC    1639             \CAP
WIENBRDG.CIR  1358             \CAP


----------------------------  Documentation   -------------------
1.0 General program usage
    =====================


 -  Select New cir from Menu "Circuit" , select Menu "New cir"
    next and enter a new circuit, or load 'old' circuit from
    disk (filename.cir).


-   Select frequencies and output quantities before calculation.


-   Plotting is done after calculation.


-   Tables are output automatically during calculation.

2.0 Example of circuit description
    ==============================

    1  IS       0 TO 1  1 AMPS
                0 DEG
    2  L        1 TO 2  2 E-4 H
    3  R        2 TO 3  .33 OHM
    4  C        3 TO 0  2.2 E-4 F
    5  R        2 TO 0  20 OHM

Note in the above example that circuit elements are described by their connec-
ting nodes, their values, and a branch or element number. It is this branch
number which is specified when requesting branch voltages, currents, or pow-
ers for output. You would also specify this number when deleting an element.
Due to the way the program orders itself, as you add independent current sour-
ources they are added to the top of the list. As you add any other elements the
are added to the bottom of the list.

CAP is divide into three sections a) Input of circuit, b) Selection of output
quantities and frequency sweep, and c) Plotting.
These sections are completely independent in that you can change any parameter
of any section and retain all other parameters.

3.0 Input of circuit
    ================

Circuit elements are input from the New circuit Menu, one element at a time
with the required information being the element type, the connecting nodes
and the value of the element, (i.e., 10 Ohm, .1 Henrys, etc.). The first
thing that must be done is to number the nodes. A node, for the purposes of
this program is any point where two ore more circuit elements meet. The no-
des must be consecutive integers, consecutive numbered nodes need not have
any special topological relationship to each other.
While inputting each element, the program will ask for the connecting nodes
with the following question: NODES: FROM, TO?. The FROM node is the node
where the current leaves the element.
For the non-source elements (resistors, inductors and capacitors), it is
not important if you don't know the direction of the current flow. Simply
assume one. If you assume wrong, the current will be computed 180 degrees
from the expected direction.
Study the example's EX1.CIR and EX2.CIR.


4.0 Selection of Output Quantities and Frequency Sweep
    ==================================================

After a circuit has been input, but before calculation beings, you will need to
select those quantities you wish to observe and the frequencies at which to ob-
serve them. There are two ways that the program can provide output. printed
table of up to 50 quantities per frequency, or a displayed plot.
Only one method can be selected at a time.

Available output quantities are node voltages, branch voltages, branch currents
branch power and ratio of any two quantities. Node voltage zero is not avail-
able for output, but is always 0 volts at 0 degrees. A branch voltage is the
voltage across an element. It is the node voltage at the positive node minus
the node voltage at the negative node. The positive node for a controlled or
independent current source, by convention, is the node where the current leaves
the source (the TO node). The positive node for resistors, inductors and capa-
citors again by convention, is the node where current enters the element ( the
FROM node.


All output quantities are given in magnitude and phase format. For power this
means that real power, is measured in watts at 0 degrees.
Reactive or imaginary power, measured in VARS, is +90 degr. for inductors and
-90 degr. for capacitors.
For non-
source elements power is defined as power absorbed. For source elements
power is defined as power delivered. For any given circuit the complex sum of
power delivered by the sources will equal the complex sum of the powers absor-
bed by the elements.

The frequency sweep is selected by specifying a minimum frequency, a maximum
frequency, and an increment. If the increment is positive each new frequency
will be the old frequency plus the increment. If the increment is negative,
you have specified a logarithmic sweep with each new frequency equal to the
old frequency times the absolute value of the increment.


5.0 Plotting
    ========

Plotting is accomplished after calculations are performed. The magnitude
and phase of the output quantity selected are stored for up to 50 frequen-
cies. With the same set of data you may make any number of plots.

You need not select any plotting parameter. Automatic labeling and scaling are
default. The automatic labeling puts out the following information: whether
you're plotting magnitude or phase, the output quantity, and whether dB's
are selected for ratios. If automatic labeling is not sufficient you may
select any 18 characters. If you wish to select different scaling parame-
ters you may select the maximum. minimum and the space between the tic marks.
These parameters may be selected independently for the X and directions.
You may even leave one direction automatic and select the other.

6.0       Additional explanation for some commands
          ========================================

New cir  : Enter a new circuit, same input as add element.
Add elem : Add circuit element to an already existing circuit.

RES         When R NODES :FROM, TO? is displayed,
IND      1) Enter the node where currents enters the resistor followed by
CAP         a comma.
         2) Enter the node where current leaves the resistor.
            When VALUE? is displayed enter the resistance in Ohms.
            The same is done when entering an inductor or capacitor where
            the value is entered in the resp. quantity.

IS          When IS NODES: FROM, TO? is displayed,
         1) Enter the node where current enters the source, followed by
            a comma.
         2) Enter the node where the current leaves the source.

            When AMPLITUDE is displayed, enter the amplitude in Amperes.
            When PHASE is displayed, enter the phase in degrees.

6.1    continued

VCIS   : Add a voltage controlled current source

         When CONTROLLING NODES: +, -? is displayed,
      1) Enter the number of the positive controlling node followed by a
         comma.
      2) Enter the number of the negative controlling node.

         When CONTROLLED NODES: FROM, TO? is displayed,
      1) Enter the node where the current enters the controlled source
         followed by a comma.
      2) Enter where the current leaves the controlled source.

         When gm is displayed,
         Enter the transconductance in Siemens.

Del elem:To delete circuit elements when ELEMENT #? is displayed.
         Enter the element #, as it is numbered in the circuit descrip-
         tion (0 for none).

6.2  continued

TABLE  : Select tabular output quantities.
PLOT   : Select plotted output quantities.

Note that both TABLE and PLOT clear any previous selected output quantity.

dB     : Default dB is on and all ratios are output in dB.

FREQS  : When MIN FREQ? is displayed,

      1) Enter minimum or starting frequency in Herz

         When MAX FREQ? is displayed,

      1) Enter the maximum or ending frequency in Herz

         When INC[(-) FOR LOG]? is displayed,

      1) Enter an additive frequency increment
         OR
      2) Enter the negative of a multiplicative frequency increment.

6.3  continue

When output quantities are selected enter the number of the branch or node
as defined by the circuit description. Note that branch power S is a com-
plex number (S=V*I) and will be output in magnitude and phase format.

If you wish to calculate ratio's (in most cases):

1) First select the numerator (e.g Node Voltage  2 in previous example).
2) Click next Ratio "/" (becomes shaded)
3) Select the denominator (e.g. Node Voltage 1 in previous example).

If PLOT is selected ONLY 1 ratio or value can be selected at the time.
If TABLE is selected up to 21 ratios or quantities can be selected.

The SUPERIMPOSE function superimposes the next plot over the last plot
(dashed line), using the next plot's scaling parameters.

------------------------------

End of Info-Atari16 Digest
**************************(4to hiHo