After a while, it seems that Acorn RISC PC power supplies
blow up, usually following expansion of the machine.
I managed to blow up the supply in mine, and it turned out to be the rectifier diode in the 5 volt rail that had failed.
This diode is an MBR2045T, which is a 20 Amp 45 volt part. I found the replacement CT2045 type device in Maplins, and also a beefier CT3045 part, which is rated at 30 Amps. and which fits the holes in the PCB better !!. I have replaced it and so far so good.
In fact the application of the diode in the power supply is
wrong. The MBR2045 type is a pair of diodes intended to be used in a PC
supply where there is a centre tapped transformer. Then the current is
shared. In the RISC PC, the two diodes are merely wired in parallel.
Whichever diode gets hottest first takes all of the current. (positive temperature coefficient of resistance). Then it gets hotter and blows. So the diode is actually only capable of carrying 50% of the current you would expect.
April 1997 : A colleague of mine had his RISC PC stop because of the same fault, with the same cure. In his case he had been scrupulously careful about not overloading the power supply !!
File :make_tar.gz (97358 bytes) tar archive, gzip compressed (Updated 03 August 1997 links with UnixLib 3.7b , compiles with gcc 2.7.2)
Latest update : 3 August 1997
; Acorn port by M.James (Use email@example.com)
Suitable for gcc, and Acorn CC with UnixLib
UnixLib - My version is built with UnixLib 3.7b
Sources are provided, and in fact , you build the Makefile application
Un-GZIP the file
(you can delete the rest once you have built make )
While hunting around info-server@ukc in 1989, I came
across a set of files which claimed to be a Public Domain Make
implementation. I downloaded these, and set about ANSI-fying them. I
think I am about 95% of the way there.
As you will see when you look in the !boot and !run files , you can either type the make command into the CLI , or double click the makefile. I have also added the -@ makefilename parameter which tells make it's running as a double-clicked application. Then it has to get the path name of everything by looking at the makefile path name.
make expects the makefile to be just above the .c and .o directories.
| | | |
makefile c o thing to make
type FE1 | |
dont forget to settype makefile FE1 or settype makefile
makefile - you can have more than one makefile with different targets
in the same directory , or use it from the CLI for setting options etc.
I hope you enjoy it.. :-)
I do now I've got it going.
This has subsequently been updated by myself, for use with GCC and UnixLib, and tested by Reuben Thomas, who put up with some distinctly dodgy versions.
This version has been tested with both gcc and Acorn Cv4
It is much less stupid than AMU. In 1989 I posted a version to Acorn and they claimed AMU would be improved. Still waiting ....
Changes from earlier versions:
I added the -v switch which makes it print what it is
about to do.
THIS SOFWARE EXISTS ONLY THANKS TO THE GENEROSITY OF ANOTHER
FAR MORE COMPETENT PROGRAMMER WHO PLACED THEIR MAKE INTO THE PUBLIC
DOMAIN. NONE OF THE REALLY DIFFICULT BITS ARE MY WORK, JUST THE
EVENINGS OF FRUSTRATION GETTING IT TO GO ON THE ARCHIMEDES.
File :man_tar.gz (97358 bytes) tar archive, gzip compressed (Updated 03 March 1997 linked with UnixLib 3.7b)
This is a quick and dirty port of 'cawf' that came from
Simtel20 This implements an 'nroff' and 'man' function that runs under
Two invocations are possible
Once the filer has seen !man then any files in the !man.1 directory can be read by typing
Or by double clicking any file of type ManPages (100)
The 'nroff' program itself is called 'cawf' (see the cawf
ManPages file) and can be invoked independently.
Then it will also format to 1st word plus files (this prints via Acorn drivers )
cawf -man -dacorn manfile > printer:
cawf -man -dacorn manfile > FWP_file
Will produce bold and underline in a FirstWord Plus File (for e.g. Ovation) Look in cawf:lib.device/cf on how to add devices
For RISCOS port:
Mike James m...@hamble.demon.co.uk Thats me. Full of Pouilly-Fumé and happy for it.
*Copyright (c) 1991 Purdue University Research Foundation,
*West Lafayette, Indiana 47907. All rights reserved.
*Written by Victor A. Abell
*University Computing Center. Not derived from licensed software;
*derived from awf(1) by Henry Spencer of the University of Toronto.
*Permission is granted to anyone to use this software for any
*purpose on any computer system, and to alter it and redistribute
*it freely, subject to the following restrictions:
*1. The author is not responsible for any consequences of use of
* this software, even if they arise from flaws in it.
*2. The origin of this software must not be misrepresented, either
* by explicit claim or by omission. Credits must appear in the
*3. Altered versions must be plainly marked as such, and must not
* be misrepresented as being the original software. Credits must
* appear in the documentation.
*4. This notice may not be removed or altered.