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Archive Magazine 1996
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1995-11-10
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Hints and Tips
9.3
DFS on RiscáPC Ö I recently installed an ActiLead 5╝ö to get a second
floppy on my Risc PC ACB45. Despite HECæs disclaimers, I thought it
should be possible to handle BBC discs by third-party access software,
such as I have used regularly on an A440. Three programs scored varying
degrees of success:
9.3
DFSReader (Beebug Ltd), non-WIMP, 1988 Ö Installs a module giving star
commands *DCAT, *DEX, *DINFO, *DBACKUP and *DCOPY. Copy allows Éreadingæ
to an ADFS disc etc (no Write). It seems OK with Actilead on both 5╝ö
and 3╜ò BBC-80 floppies in drives 1 and 0 respectively. I cannot verify
its claims to handle also Watford 62-Cat DFS & DDFS & Solidisc DFS, nor
have I tried 40-track discs.
9.3
DFSReader (Freeware by Emmet Spier), 1990. Ö This was on Shareware No.
31, now available from APDL. A desktop application that puts one extra
floppy disc icon on the bar. <Menu> allows choice of: Drive (0 to 3),
Name Disc, Free, & Import Dir (?). <Select> gives a filer window, with
menu choices of Display, Rename, Delete, Access and Count. Read and
write work by usual drag-and-drop to the filer. It is restricted to 80-
track BBC DFS and has no format option. It reads/writes all the 5╝ö BBC
80-T DFS discs I have tried. It also works on drive 0 (3╜ò).
9.3
!DFS (Dabs Press), 1990. This is also a desktop application and has four
icons on the bar for drives 0-3. <Menu> offers Disc Info, (Un)Protect,
Swap Cats, Dismount, Format, Backup, Verify, Free. <Select> gives a
filer window with read/write by drag and drop as usual. Format offers
Acorn (DFS), Solidisc or Watford formats each in 40- or 80-track. I
proved 80-T DFS format and verify OK via the Actilead on 5╝ö drive 1 and
on 3╜ò drive 0. Read/write failed with original BBC discs, but was OK on
discs formatted with this program.
9.3
I thus use !DFS only to format/verify a disc and !DFSReader to read/
write BBC DFS 80 discs. The 5╝ö drive is a Cumana 40/80 (Mitsubishi
mechanism) but the 40 option is not used!
9.3
Eric Ayers, Ipswich.
9.3
Drawing ellipses Ö Acornæs Draw program allows ellipses to be drawn very
easily when using orthographic projection. However, when drawing
isometric views, it may be easier to use the Éfour arc methodæ to
construct an isometric circle, as this allows the size of the ellipse to
be fixed by using an isometric square. Here is the method I use.
9.3
1. If using Draw, set up an isometric box of equal side and include the
axes, centre O. (Fig 1)
9.3
2. Use the arc-tool to draw the arc from Éaæ to Ébæ, tangential to each
axis.
9.3
3. Repeat the same process for arc Ébcæ. (Figs 2 and 3) It may be
necessary to adjust the arcs to form a figure that Élooksæ OK.
9.3
4. Now group together the two arcs and copy them. (Fig 3a)
9.3
5. Rotate the copy through 180░ and move to join at Éaæ and Ébæ to form
the complete figure. (Fig 4)
9.3
6. Group the two halves together to form the complete isometric circle.
(Fig 4a) The combination of the two arcs can also be used to draw the
corresponding isometric circles on the other two faces of the isometric
cube as shown in Figs 5 and 6.
9.3
Les Lewis, Sheerness.
9.3
Envelopes Ö Some advice was given in Archive recently regarding
addressing envelopes on a printer. I appreciate wanting a Éneat jobæ,
but it can still be rather fiddly. Personally, for all my average
letters Ö whether personal or business Ö I use white window envelopes,
having printed the address at the start of the letter on the left, in
the usual Ébusiness letteræ format.
9.3
You quickly learn the distance needed from the top of the page, to
enable a neat fold to position the address in the window. It looks
professional and also avoids the risk of printer ink being smudged by
rain.
9.3
Elma Alexander, Crail, Fife.
9.3
Flashing colours on RiscáPC Ö If you run a non-Wimp Basic program in an
Éoldæ 16-colour mode, you will find that the default flashing colours Ö
colours 8 to 15 Ö donæt flash!
9.3
Using OS_Byte 195 shows that the default setting of ÉDuration of first
colour flash is 0æ, which holds the first colour indefinitely Ö thus
stopping the flashing.
9.3
Using OS_Byte 9 to reset the first colour flash duration to 25/50ths
sec. effectively switches the flashing back on. The instruction is SYS
öOS_Byteò,9,25.
9.3
There is no need to worry about setting the second colour flash duration
as its default value is already 25. I find this latter a little strange.
Itæs as if someone set the first colour duration to zero to disable
flashing temporarily and then forgot to reset it to 25! First and second
colours both at 25 were the Éoldæ default settings for BBC B and later.
9.3
Using OS_Byte 9 in a program as above will activate the flashing colours
for all subsequent non-Wimp programs run in any 16 screen mode until you
switch off or reset, so you may want to prevent this by also including
SYS öOS_Byteò,9,0 in your program closedown sequence, to restore things
as they were.
9.3
Ray Favre, West Drayton.
9.3
Fractions (p 23) Some Acorn fonts do have a Éfraction baræ as Alt-140.
It is in MathGreek, and in my EFF fonts, but not in Trinity or Homerton.
It makes fraction look better than the conventional slash, and does not
break at the end of a line.
9.3
Colin Singleton, Sheffield.
9.3
New life for dead HP cartridges Ö HP (and probably other inkjet printer
producers as well) warn most emphatically against touching the copper
foil with the tiny nozzles. There is, however, one situation where this
warning can be disregarded Ö when some nozzles are really hopelessly
clogged.
9.3
This happened to me this summer when, during a four week absence, the
printer had stood unused in a room where the temperature was almost
constantly above 30░C. After my return, most nozzles were blocked, and
three of the telltale white lines were proof against alcohol, warm water
and even a special cleaning fluid which I sometimes use to good effect.
9.3
Rather than throw the useless cartridge away, I made one last attempt Ö
I bathed the bristles of a new soft toothbrush in alcohol and very
gently brushed over the nozzles.
9.3
The next test print showed no more white lines, and now the cartridge
works faultlessly again.
9.3
Jochen Konietzko, K÷ln, Germany
9.3
Turbo Driver hazard warning (8.11 p26 + 9.1 p44) Ö There is an option
öIgnore statusò on the Turbo Driver menu (<shift-select> on the icon)
which means the Turbo Driver does not attempt to report whether the
printer is out of paper, turned off, etc. Set this, and the problem
should be solved. On my Epson Stylus Color with Risc PC and Impression
Publisher dongle (not the new Color II), Iádo not set this ignore, and
get some messages back. Some messages are useful, but not all, and they
are not always the right ones. Does anyone have similar problems, or a
solution?
9.3
Mike Clarkson, Shrewsbury.