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!AWJan92/Goodies/FindDir/!System/ReadMe
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 » Recent acquisitions » Acorn ADFS disks » adfs_ArchimedesWorld_199201.adf » January92 |
| Filename: | !AWJan92/Goodies/FindDir/!System/ReadMe |
| Read OK: | ✔ |
| File size: | 2158 bytes |
| Load address: | 0000 |
| Exec address: | 0000 |
File contents
RISC OS 2.00 Extras Disc Part number 0283,390 issue 1
-------------------------------------------------------
This disc contains updated versions of some applications in the RISC OS 2.00
Application Suite, and some replacement and additional modules for the RISC
OS 2.00 ROM.
The applications on this disc may be used in preference to the versions in
the Application Suite. For details of the changes implemented, read on
within this file.
It is suggested that users who are new to RISC OS should first familiarise
themselves with the system in general by reading the Welcome Guide and using
the Application Suite discs 1 and 2 before using or merging-in modules from
this extras disc.
The software on this disc may be copied for use on any computer system
containing the RISC OS Operating System, provided that all the requirements
of the End-User License Conditions for the RISC OS Operating System are
complied with, and that a copy of this ReadMe file accompanies every copy of
the software. A copy of the End-User License Conditions for the RISC OS
Operating System is supplied with every computer system containing the RISC
OS Operating System.
This software is provided "as is"; Acorn Computers Limited ("Acorn") makes
no warranty, express or implied, of the merchantability of this software or
its fitness for any particular purpose. In no circumstances shall Acorn be
liable for any damage, loss of profits, or any indirect or consequential
loss arising out of the use of this software or inability to use this
software, even if Acorn has been advised of the possibility of such loss.
Versions
--------
This disc contains the following updated versions of certain RISC OS
applications and modules and some additional modules, in addition to this
ReadMe file.
!PrinterPS 1.12
!PrinterDM 1.12
!PrinterLJ 1.12 [for driving Hewlett Packard 'LaserJet' laser printers]
!PrinterIx 1.12 [for driving Integrex colour inkjet printers]
!System 0.45
!65Host 1.40
modules.NetFS 5.48
modules.NetPrint 5.30
modules.NetFiler 0.24
modules.NetStatus 2.01
modules.Hourglass 2.02
modules.Sound2 1.13
modules.IRQUtils 0.09
modules.WimpUtils 0.04
Printer drivers
---------------
The printer drivers include various improvements, and are almost exactly the
same as those in the Acorn Desktop Publisher product. They should be used
in preference to the ones supplied with the RISC OS 2.00 Application Suite.
When used to drive an Econet connected printer the NetPrint module supplied
on this extras disc (or a later version of NetPrint) MUST be used.
Functional enhancements to each printer driver since the RISC OS 2.00
Application Suite release are described in a ReadMe file inside each
application. If you wish to read these files, double-click on the
application in question whilst holding down the SHIFT key. The resource
files for the application will appear in a directory viewer; the ReadMe
file, if present, will be a Text file (like this one).
!System
-------
!System is a replacement for the !System application provided on your
original Applications disc 1. It contains the following updated modules:
Clib 3.50
Colours 0.52
FPEmulator 2.80
If your current !System is the original, you should replace it (and any
copies) with the version supplied on this disc. If your current !System
contains additional modules or material (perhaps as a result of installing
one or more third party applications) you should merge the new version
with the old.
!65Host
-------
This is a replacement for the !65Host supplied with the RISC OS Application
Suite. A number of significant enhancements have been made, including
parallel printer support and sound emulation. For full details, see the
ReadMe file within the !65Host directory. To read this, double-click on the
!65Host application while holding down the SHIFT key. The resource files for
!65Host will appear in a directory viewer. The ReadMe file is a Text file
(like this one).
Econet network modules
----------------------
The replacement modules NetFS, NetPrint, NetStatus and NetFiler correct
various minor problems in those modules. Most users should notice no
difference, except for improved error messages from NetPrint. Remember, if
you wish to use one of the printer drivers on this disc with an Econet
printer, you must use the NetPrint from this disc, or a later version. The
net modules are direct replacements for the similar modules in the RISC OS
2.00 ROM.
The simplest way to load the new econet modules is to *RMLoad each one
before logging onto the Econet, and before entering the desktop, in a
machine boot sequence.
It is also possible to load them from within the desktop, and from the net.
The following points should be noted about this procedure.
NetStatus module - this can be loaded at any time, even from the Econet.
NetFS module - loading this logs you off the network. After loading it,
simply log back on again.
NetFiler module - loading this causes your network icons to disappear from
the icon bar. It also causes an error message to appear ("Use *Desktop to
start NetFiler"), which can safely be ignored. To make the net icons
reappear, exit from the desktop (using the Task manager's Exit menu entry)
and then re-enter by typing *Desktop.
WimpUtils
---------
The module WimpUtils fixes a problem that can cause an extremely rare crash
of the desktop environment, when using the Wimp in the RISC OS 2.00 ROM.
Any subsequent Wimp modules will have this problem fixed, but because the
Wimp module is 50K in size this smaller 'fix' module has been produced.
Simply RMLoad it; you should notice no difference in the operation of the
machine.
IRQUtils
--------
Since the development of RISC OS, a new module IRQUtils has been produced
which improves the IRQ latency of RISC OS 2.00 under some circumstances.
This can make it easier to use certain devices (such as the serial line) in
the desktop environment. It can also improve operation outside the desktop,
especially when the device is being used in background.
Related to this is the development of new versions of the Hourglass and
SoundScheduler (in the file Sound2) modules. These should be used in
conjunction with IRQUtils.
IRQUtils only has any effect when loaded with RISC OS 2.00. If loaded with a
later version of RISC OS it will have no effect (future versions of RISC OS
will have the IRQUtils functionality built in). As a general rule it is best
to only load IRQUtils if this precise kernel is being used, and to use
*RMEnsure for the other modules.
In general, IRQ latency is kept to less than 1 millisecond when these new
modules are in use. IRQ latency can be adversely affected if multiple
IRQ-intensive devices are in use. The use of very high resolution screen
modes (e.g. 21 and 24), and the changing of screen mode, can also affect it.
It is also worth noting that RISC OS applications can easily insert code
that is executed in IRQ mode or with IRQ disabled, and unwisely written
applications or device drivers can also lead to problems in this area.
When changing screen mode from a mode that requires little memory to one
that requires more, RISC OS sometimes has to shuffle the use of memory pages
in the machine because the video circuitry can only access certain physical
pages. This has to be done with IRQ disabled because the pages might
contain the workspace of some IRQ code. Thus, a whole page of memory must
be copied with IRQ disabled; the effect is worse on a 4Mb system (with 32K
pagesize) than on a 1Mb system (with 8K pagesize).
OS_AddCallBack
--------------
From version 0.09, IRQUtils also fixes a bug in the SWI OS_AddCallBack
mechanism.
The bug normally only causes problems for programs which make regular
requests for callbacks (eg on a ticker event). It results in the system
heap filling up with blocks which have not been freed, and eventually the
call to request a callback will return with 'System heap full'.
The bug also means there is a small risk of the whole machine crashing, if a
request for callback occurs before an earlier request has been granted, and
the second requester (which will be 'called' first) issues a SWI which
claims a block from the system heap.
Programmers who wish to use SWI OS_AddCallBack should therefore RMEnsure the
IRQUtils module, and should also 'build' it into application directories if
appropriate. The same comments above apply about loading on versions other
than RISC OS 2.00.
END OF README FILE
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00001bc0 69 73 20 61 72 65 61 2e 0a 0a 57 68 65 6e 20 63 |is area...When c|
00001bd0 68 61 6e 67 69 6e 67 20 73 63 72 65 65 6e 20 6d |hanging screen m|
00001be0 6f 64 65 20 66 72 6f 6d 20 61 20 6d 6f 64 65 20 |ode from a mode |
00001bf0 74 68 61 74 20 72 65 71 75 69 72 65 73 20 6c 69 |that requires li|
00001c00 74 74 6c 65 20 6d 65 6d 6f 72 79 20 74 6f 20 6f |ttle memory to o|
00001c10 6e 65 0a 74 68 61 74 20 72 65 71 75 69 72 65 73 |ne.that requires|
00001c20 20 6d 6f 72 65 2c 20 52 49 53 43 20 4f 53 20 73 | more, RISC OS s|
00001c30 6f 6d 65 74 69 6d 65 73 20 68 61 73 20 74 6f 20 |ometimes has to |
00001c40 73 68 75 66 66 6c 65 20 74 68 65 20 75 73 65 20 |shuffle the use |
00001c50 6f 66 20 6d 65 6d 6f 72 79 20 70 61 67 65 73 0a |of memory pages.|
00001c60 69 6e 20 74 68 65 20 6d 61 63 68 69 6e 65 20 62 |in the machine b|
00001c70 65 63 61 75 73 65 20 74 68 65 20 76 69 64 65 6f |ecause the video|
00001c80 20 63 69 72 63 75 69 74 72 79 20 63 61 6e 20 6f | circuitry can o|
00001c90 6e 6c 79 20 61 63 63 65 73 73 20 63 65 72 74 61 |nly access certa|
00001ca0 69 6e 20 70 68 79 73 69 63 61 6c 0a 70 61 67 65 |in physical.page|
00001cb0 73 2e 20 54 68 69 73 20 68 61 73 20 74 6f 20 62 |s. This has to b|
00001cc0 65 20 64 6f 6e 65 20 77 69 74 68 20 49 52 51 20 |e done with IRQ |
00001cd0 64 69 73 61 62 6c 65 64 20 62 65 63 61 75 73 65 |disabled because|
00001ce0 20 74 68 65 20 70 61 67 65 73 20 6d 69 67 68 74 | the pages might|
00001cf0 0a 63 6f 6e 74 61 69 6e 20 74 68 65 20 77 6f 72 |.contain the wor|
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00001d10 52 51 20 63 6f 64 65 2e 20 54 68 75 73 2c 20 61 |RQ code. Thus, a|
00001d20 20 77 68 6f 6c 65 20 70 61 67 65 20 6f 66 20 6d | whole page of m|
00001d30 65 6d 6f 72 79 20 6d 75 73 74 0a 62 65 20 63 6f |emory must.be co|
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00001d50 73 61 62 6c 65 64 3b 20 74 68 65 20 65 66 66 65 |sabled; the effe|
00001d60 63 74 20 69 73 20 77 6f 72 73 65 20 6f 6e 20 61 |ct is worse on a|
00001d70 20 34 4d 62 20 73 79 73 74 65 6d 20 28 77 69 74 | 4Mb system (wit|
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00001d90 74 68 61 6e 20 6f 6e 20 61 20 31 4d 62 20 73 79 |than on a 1Mb sy|
00001da0 73 74 65 6d 20 28 77 69 74 68 20 38 4b 20 70 61 |stem (with 8K pa|
00001db0 67 65 73 69 7a 65 29 2e 0a 0a 0a 4f 53 5f 41 64 |gesize)....OS_Ad|
00001dc0 64 43 61 6c 6c 42 61 63 6b 0a 2d 2d 2d 2d 2d 2d |dCallBack.------|
00001dd0 2d 2d 2d 2d 2d 2d 2d 2d 0a 0a 46 72 6f 6d 20 76 |--------..From v|
00001de0 65 72 73 69 6f 6e 20 30 2e 30 39 2c 20 49 52 51 |ersion 0.09, IRQ|
00001df0 55 74 69 6c 73 20 61 6c 73 6f 20 66 69 78 65 73 |Utils also fixes|
00001e00 20 61 20 62 75 67 20 69 6e 20 74 68 65 20 53 57 | a bug in the SW|
00001e10 49 20 4f 53 5f 41 64 64 43 61 6c 6c 42 61 63 6b |I OS_AddCallBack|
00001e20 0a 6d 65 63 68 61 6e 69 73 6d 2e 0a 0a 54 68 65 |.mechanism...The|
00001e30 20 62 75 67 20 6e 6f 72 6d 61 6c 6c 79 20 6f 6e | bug normally on|
00001e40 6c 79 20 63 61 75 73 65 73 20 70 72 6f 62 6c 65 |ly causes proble|
00001e50 6d 73 20 66 6f 72 20 70 72 6f 67 72 61 6d 73 20 |ms for programs |
00001e60 77 68 69 63 68 20 6d 61 6b 65 20 72 65 67 75 6c |which make regul|
00001e70 61 72 0a 72 65 71 75 65 73 74 73 20 66 6f 72 20 |ar.requests for |
00001e80 63 61 6c 6c 62 61 63 6b 73 20 28 65 67 20 6f 6e |callbacks (eg on|
00001e90 20 61 20 74 69 63 6b 65 72 20 65 76 65 6e 74 29 | a ticker event)|
00001ea0 2e 20 49 74 20 72 65 73 75 6c 74 73 20 69 6e 20 |. It results in |
00001eb0 74 68 65 20 73 79 73 74 65 6d 0a 68 65 61 70 20 |the system.heap |
00001ec0 66 69 6c 6c 69 6e 67 20 75 70 20 77 69 74 68 20 |filling up with |
00001ed0 62 6c 6f 63 6b 73 20 77 68 69 63 68 20 68 61 76 |blocks which hav|
00001ee0 65 20 6e 6f 74 20 62 65 65 6e 20 66 72 65 65 64 |e not been freed|
00001ef0 2c 20 61 6e 64 20 65 76 65 6e 74 75 61 6c 6c 79 |, and eventually|
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00001f10 75 65 73 74 20 61 20 63 61 6c 6c 62 61 63 6b 20 |uest a callback |
00001f20 77 69 6c 6c 20 72 65 74 75 72 6e 20 77 69 74 68 |will return with|
00001f30 20 27 53 79 73 74 65 6d 20 68 65 61 70 20 66 75 | 'System heap fu|
00001f40 6c 6c 27 2e 0a 0a 54 68 65 20 62 75 67 20 61 6c |ll'...The bug al|
00001f50 73 6f 20 6d 65 61 6e 73 20 74 68 65 72 65 20 69 |so means there i|
00001f60 73 20 61 20 73 6d 61 6c 6c 20 72 69 73 6b 20 6f |s a small risk o|
00001f70 66 20 74 68 65 20 77 68 6f 6c 65 20 6d 61 63 68 |f the whole mach|
00001f80 69 6e 65 20 63 72 61 73 68 69 6e 67 2c 20 69 66 |ine crashing, if|
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00001fa0 61 6c 6c 62 61 63 6b 20 6f 63 63 75 72 73 20 62 |allback occurs b|
00001fb0 65 66 6f 72 65 20 61 6e 20 65 61 72 6c 69 65 72 |efore an earlier|
00001fc0 20 72 65 71 75 65 73 74 20 68 61 73 20 62 65 65 | request has bee|
00001fd0 6e 20 67 72 61 6e 74 65 64 2c 20 61 6e 64 0a 74 |n granted, and.t|
00001fe0 68 65 20 73 65 63 6f 6e 64 20 72 65 71 75 65 73 |he second reques|
00001ff0 74 65 72 20 28 77 68 69 63 68 20 77 69 6c 6c 20 |ter (which will |
00002000 62 65 20 27 63 61 6c 6c 65 64 27 20 66 69 72 73 |be 'called' firs|
00002010 74 29 20 69 73 73 75 65 73 20 61 20 53 57 49 20 |t) issues a SWI |
00002020 77 68 69 63 68 0a 63 6c 61 69 6d 73 20 61 20 62 |which.claims a b|
00002030 6c 6f 63 6b 20 66 72 6f 6d 20 74 68 65 20 73 79 |lock from the sy|
00002040 73 74 65 6d 20 68 65 61 70 2e 0a 0a 50 72 6f 67 |stem heap...Prog|
00002050 72 61 6d 6d 65 72 73 20 77 68 6f 20 77 69 73 68 |rammers who wish|
00002060 20 74 6f 20 75 73 65 20 53 57 49 20 4f 53 5f 41 | to use SWI OS_A|
00002070 64 64 43 61 6c 6c 42 61 63 6b 20 73 68 6f 75 6c |ddCallBack shoul|
00002080 64 20 74 68 65 72 65 66 6f 72 65 20 52 4d 45 6e |d therefore RMEn|
00002090 73 75 72 65 20 74 68 65 0a 49 52 51 55 74 69 6c |sure the.IRQUtil|
000020a0 73 20 6d 6f 64 75 6c 65 2c 20 61 6e 64 20 73 68 |s module, and sh|
000020b0 6f 75 6c 64 20 61 6c 73 6f 20 27 62 75 69 6c 64 |ould also 'build|
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000020d0 61 74 69 6f 6e 20 64 69 72 65 63 74 6f 72 69 65 |ation directorie|
000020e0 73 20 69 66 0a 61 70 70 72 6f 70 72 69 61 74 65 |s if.appropriate|
000020f0 2e 20 54 68 65 20 73 61 6d 65 20 63 6f 6d 6d 65 |. The same comme|
00002100 6e 74 73 20 61 62 6f 76 65 20 61 70 70 6c 79 20 |nts above apply |
00002110 61 62 6f 75 74 20 6c 6f 61 64 69 6e 67 20 6f 6e |about loading on|
00002120 20 76 65 72 73 69 6f 6e 73 20 6f 74 68 65 72 0a | versions other.|
00002130 74 68 61 6e 20 52 49 53 43 20 4f 53 20 32 2e 30 |than RISC OS 2.0|
00002140 30 2e 0a 0a 0a 45 4e 44 20 4f 46 20 52 45 41 44 |0....END OF READ|
00002150 4d 45 20 46 49 4c 45 0a |ME FILE.|
00002158 
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