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- Hints and Tips
- 7.1
- • A300/400 floppy drive problems − On the old A310 and A440 machines,
- the disc drive has a cover on the head which has a notorious tendency to
- fall off but the drive is not affected by a missing cover. A far more
- usual fault on A310 drives is that the eject button falls off. This can
- easily be fixed with glue. (Do take the drive out of the machine first
- so you don’t glue the button to the front of the computer!)
- 7.1
- On the old machines (with only the disc drive button sticking out
- through the front fascia) you have no option but to replace them with an
- identical Sony drive mechanism (£102 through Archive − Ouch! Ed.) but on
- the newer machines, like the A410/1, you can use most 720Kb drives
- available. (Are you sure? Ed.) Knut Folmo, Norway.
- 7.1
- • Bespoke appointments’ calendar − I have written a program (on the
- monthly program disc) to generate an Impression-based appointments
- calendar and would like to share it with other people, courtesy of
- Archive magazine. Using the program avoids filling in all those
- birthdays, etc every year. It’s all done automatically from a text file.
- It’s written in Basic and has no glitzy front end but it works OK. Ian
- Summers, Norwich.
- 7.1
- • Elite − A space station exists in witch space. After killing all the
- other ships, switch to one of the status screens (f8?) and the compass
- will reappear. By jumping repeatedly in that direction, you can
- eventually find it. This station is strange in many ways and, while you
- are experimenting, it is worth noting that its existence changes while
- you are looking at the status screen. Try docking and shooting while
- using <f8>. Geoff Scott, Northampton.
- 7.1
- • Form feeds in printer drivers − I would like to respond to Mick Day’s
- comments about form feeds (6.12 p57). The terminal form feed is
- definitively (now there’s sticking my neck out) configurable. Mick does
- not say whether he is using text or graphics output to his printer but
- for the dot matrix drivers this is what happens.
- 7.1
- Text output:-
- 7.1
- send
- 7.1
- StartTextJob code
- 7.1
- SetLines code plus byte to set the page depth in text lines
- 7.1
- [your text formatted as per option set, eg none or draft highlights etc
- using specified line feed/ linefeed cr codes]
- 7.1
- {gets to the end of a page
- 7.1
- [more text as above]}
- 7.1
- .
- 7.1
- . repeat above for number of pages
- 7.1
- .
- 7.1
- EndTextJob code (this usually includes a Form Feed in the codes sent)
- 7.1
- For graphics you have:-
- 7.1
- SetLines code plus byte as above
- 7.1
- PageStart code
- 7.1
- [Graphics data using specified control strings]
- 7.1
- @{of a page
- 7.1
- PageEnd code
- 7.1
- SetLines code as above
- 7.1
- PageStart code
- 7.1
- [Graphics data as above]}
- 7.1
- .
- 7.1
- . repeat for number of pages
- 7.1
- .
- 7.1
- GraphicsFormFeed code PageEnd code
- 7.1
- thus, by defining your form feed character in the driver definition file
- to be nothing, form feeds can be suppressed. Remember though that it
- needs to be done for each graphics resolution and each text definition.
- 7.1
- I have a dummy printer def file which replaces the genuine control codes
- with strings to illustrate what is going on. If it is merged into
- !Printers’ Printer control window and set to print to file, output from
- it can be viewed in !Edit to see what is going on. If a multipage text
- file is dragged to it, the effect of text control codes can be viewed,
- and similarly with graphics. The ideal is a two-page document using
- outline fonts with, say, just one character at the bottom of each page
- so that there is not too much graphics garbage to wade through but
- mostly LineSkip codes. The printer def file and a suitable text test
- file are on the Archive monthly disc. It includes a ‘Graptest’ file
- which is a two-page Wordz “document”. Tim Nicholson, Cranleigh.
- 7.1
- • Keyboard cleaning − We regularly get asked about keyboard problems,
- many of which could be solved by cleaning. That, I think, is the answer
- to Brian Cowan’s question in his Hardware Column last month. There have
- been three main references to this in Archive (3.9 p10 + 5.1 p25 + 5.2
- p28). I think these should cover most eventualities. Ed.
- 7.1
- In response to Brian’s question, several subscribers sent in
- descriptions of how to clean a keyboard. I think that much of it is
- covered by the references above but I think Knut Folmo’s comments which
- follow may also be helpful. Ed.
- 7.1
- • Keyboard cleaning (2) − There are three different keyboards on
- Archimedes computers.
- 7.1
- (1) KPL keyboard − This was used only on VERY old A310 machines. It can
- be identified by looking at the CapsLock LED, which is mounted on the
- right hand side of the key-top, as opposed to the left on the more usual
- types. This is horrible to type on! If you still have such a keyboard,
- throw it in the wastebin and buy a new! (Funnily enough, Acorn keyboards
- are on special offer at the moment for £95 instead of £123 − strictly
- while stocks last − I have about 10 of them. Ed)
- 7.1
- (2) Keytronics keyboard − This is the normal keyboard on most of the
- A310s and nearly all the A400/1 range. If you take off one of the keys,
- you will see a rubber cap that is mounted between the key and the
- keyswitch.
- 7.1
- These keyboards do not like hair, biscuits and other kinds of dust. If
- any keys fail, it most likely to be the CapsLock key because the hole
- around the LED makes it possible for dust to get into the keyswitch. If
- you have access to pressurised air, you can fix the key for a limited
- period of time by taking off the keytop and blowing some air around the
- LED. The best cure is to open the whole keyboard and clean it. This is a
- lot of work and involves unscrewing approximately 40 screws. (See the
- references mentioned above. Ed.)
- 7.1
- (3) Cherry keyboards − All A5000/A540 machines have this type of
- keyboard, which use the same mechanics as the A3000. This is a very good
- membrane keyboard which seems to be very long-lasting. The use of
- membrane technology makes it impossible for dust to enter the electrical
- contacts. This type of keyboard is also the best to type on. It can
- easily be identified by taking off one of the keytops, which should have
- a little spring mounted on the underside. (Cherry keyboards are the ones
- we have on special offer at the moment. Ed.) Knut Folmo, Norway.
- 7.1
- There is a fourth type: the A4000 type keyboard. We haven’t had any of
- these go wrong yet, but we’ll report on them as and when they do. Ed.
- 7.1
- • Street maps using Draw − At the risk of being boring, since there have
- been lots of articles about using Artworks or Vector to produce street
- maps, I offer this solution using plain simple RISC OS 3 Draw. Firstly,
- draw your map using ordinary thin lines for the roads. Then group all
- the roads together and make their thicknesses (say) 4pt. Switch the grid
- lock on and copy the roads. With the grid lock on, a copy is made
- exactly one grid distance down and to the right. Therefore you can move
- the copy exactly over the original. Now change all the lines in the copy
- to colour white and thickness (say) 2pt and, hey presto, there’s your
- street map.
- 7.1
- If you want different thickness roads, keep the grid lock on and move
- the copy to a different bit of the paper. Then make the copy’s line
- colour red (so you can see it) and ungroup both maps. Carefully change
- the corresponding road lines to the required thicknesses − e.g. 8pt on
- the original and 5pt on the copy for the main roads. Then re-group the
- roads and move the copy over the original. Finally, change the copy to
- white lines. There may be more elegant ways of generating road maps but
- this one is “free” with the Archimedes! Notice also that there are no
- problems with joining different sized roads (i.e. the outlines of the
- small roads do not project into the big roads. Cain Hunt, Cambridge. A
- 7.1
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